#HttpServlet

[tccicomputercoaching]

Learn generic servlet in Advance Java

Deep Dive into Learning Generic Servlet in Advanced Java

Understanding the Role of Generic Servlet

Generic Servlet is a powerful and flexible class within the Java Servlet API, designed to handle a variety of protocols, not just HTTP. It serves as a base class for creating servlets that can process any type of request, making it an essential concept in Advanced Java programming. While most web applications today are HTTP-centric and primarily use HttpServlet, understanding Generic Servlet provides a broader perspective on how servlets work and how they can be customized for different

Core Features of Generic Servlet

Protocol Independence:

Unlike HttpServlet, which is tightly coupled with the HTTP protocol, Generic Servlet can be used to handle requests using different protocols, giving developers the freedom to create more generalized or specialized server-side components.

The service() Method:

The service(ServletRequest req, ServletResponse res) metho

Lifecycle Management:

Generic Servlet inherits from the Servlet ininit(),destroy(),getServletConfig(). T

Simplified API:

Generic Servlet provides a simpler API compared to HttpServlet, focusing on the essentials needed to handle requests and responses. This simplicity makes it a great starting point for understanding the fundamental concepts of servlets without the additional complexities of HTTP-specif

Practical Applications

While Generic Servlet is less commonly used in modern web applications compared to HttpServlet, it is still highly valuable in several sce

Custom Protocols:

If your application needs to handle requests over non-HTTP protocols (like FTP or SMTP), extending Generic Servlet allows you to implement custom handling logic without being tied to H

Foundation for Other Servlets:

Generic Servlet can serve as a base class for other specialized servlets. By creating a general-purpose servlet with Generic Servlet, you can then extend this base to create more specific servlets for differen

Educational Value:

For those learning Advanced Java, working with Generic Servlet provides deep insights into the servlet architecture and lifecycle. It helps build a strong foundation for understanding more complex servlet operations and the flexibility of th

Advantages and Disadvantages

Advantages:

Flexibility: Al

Simplicity: Focuses on the

Reusability: Can

Disadvantages:

Less Common Usage: Most

Manual Handling: R

Conclusion

Learning Generic Servlet in Advanced Java is crucial for developers aiming to gain a comprehensive understanding of servlet technology. While it may not be as frequently used as HttpServlet in modern web applications, mastering Generic Servlet equips you with the skills to handle a wider range of application scenarios. It also provides a deep understanding of how servlets function at their core, allowing you to create more flexible, reusable, and protocol-agnostic server-side components.

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[technosap]

HttpServlet Class in Servlet

HttpServlet Class in Servlet

HttpServlet Class is an extension of GenericServlet that includes methods for handling HTTP-specific data. HttpServlet provides a number of methods, such as doGet(), doPost(), and doPut(), to handle particular types of HTTP requests (GET, POST, and so on). These methods are usually called by default implementation of the service() method, which figures out what kind of request is being made and…

[seenergylife]

Corel paradox call library

Here is the simple test I am trying to run but it's not working, I don't know what I am doing wrong: Hi I tried your suggestions but still I am not able to connect. }while((sqle=sqle.getNextException())!=null) Īny help is really appreciated as I am now kind of stuck. Int iNumCols = resultSetMetaData.getColumnCount() ResultSetMetaData resultSetMetaData = rs.getMetaData() Public void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException Public void init(ServletConfig config) throws ServletException Private static final String CONTENT_TYPE = "text/html charset=windows-1252" Public class Servlet1 extends HttpServlet String url = "jdbc:Paradox:///////testdb//Data" Ĭonnection con = DriverManager.getConnection(url, "user", "password") SmbFile root = new SmbFile( "smb://testdb/Data/", new NtlmPasswordAuthentication( "NA", "user", "pwassword" )) īut next when I do the following gives error even though using the above I am logged-in but somehow the following still gives error:Ĭlass.forName(".ParadoxDriver").newInstance()

I tried the following but still am not able to do database operations, I don't know what am I doing wrong. I did tried using CIFS but am lost on what exactly to do. Isn't there some soultion that I may use along with the drivers from inside the servlet and connect to the specific box. 300+ windows boxes, then I need to have Paradox Server running on all the boxes that will be hard from maintainability wise as my code is deployed on a Unix box there a multiple servlets and web services that are trying to access those boxes. ByVal is the default if you don't specify which is changed from VB Classic (in VB Classic, ByRef was the default).ParadoxServer to run on Windows but what if I have over 300 hundred shared folders that all are on different boxes i.e. s is a constant read-only parameter.įor parameters, you can optionally specify ByVal or ByRef. You cannot assign a value to a constant parameter. A constant parameter is like a read-only parameter the compiler can optimize. ObjectPAL also offers constant parameters where you add const in front of the parameter. For by reference, add var in front of the parameter. This is an OOP-like technique for implementing a subtyping-like polymorphism which is also known as inclusion polymorphism.Īlso, some developers like to pass an array and then handle the array for a pseudo technique. However, you can have the same named method or procedure so long as they are in different libraries. This is important if you use libraries in a class-like OOP way and wish to implement some form of polymorphism (i.e. Custom operator overloading is sometimes referred to as ad-hoc polymorphism. For example, in some languages the + operator is used both to add numbers and to concatenate strings. Operater Overloading allows an operator to behave differently based on the types of values used. Method overloading is a type of polymorphism and is also known as Parametric Polymorphism. Method Overloading is where different functions with the same name are invoked based on the data types of the parameters passed or the number of parameters. Types of overloading include method overloading and operator overloading.

[dblacklabel]

Can We Make Website Using Java?

Can We Make Website Using Java? If you are interested in creating a dynamic website, you can try Java. This language allows you to embed HTML code into the code, making it easier to create dynamic pages. However, you will need a Servlet Container to run Java classes. The Apache Software Foundation offers a free version called Tomcat. Servlets Servlets are a type of web application that uses the Java language to process data. These applications are very secure and provide a robust way to display and post data. However, before you can use Servlets on your website, you need to understand the underlying concepts. A good way to learn Servlets is to start with a pet project. These projects will help you develop your skills in the area. Servlets are implemented using the Servlet interface. The most common type of servlet is HttpServlet, which is a subclass of GenericServlet. These servlets implement the Servlet interface and are typically managed by methods such as init(), service(), and destroy(). Once a servlet is loaded into the Servlet container, the container invokes the init() method, which runs only once. This method is used to initialize any costly resources and read persistent configuration data. JSP pages Java is a language used for creating web applications and serving them. However, this technology is not appropriate for creating a website itself. Some examples of websites made using Java include JSP (Java Server Pages) which is quickly becoming outdated. Instead, most web developers opt for a JavaScript framework to build the front-end, and Java on the back-end. This approach is known as REST. Java is a cross-platform programming language and is object-oriented. This means that it runs on almost any operating system. This is one of the reasons why java developers recommend building a website using it. Moreover, java codes are portable and can run on any device. Therefore, you don't need to spend time or money developing for different platforms or devices. Servlet container A Servlet container is a component of a web server that provides a runtime environment for JavaEE applications. It also provides input reading capability. It is a component of Tomcat and JBoss web servers. Essentially, a servlet is a Java class that is registered with the web container. The container invokes the init() method to create the servlet object, and then directs incoming requests to its service() method. The servlet then destructs itself when it has completed processing. Servlets are server-side components that are shared by multiple requests. Servlet containers are multi-threaded, meaning that multiple threads can use the same instance. If each request made to a single Servlet is made on the same thread, it would be incredibly expensive to create new instances of the servlet container. Thus, if a servlet container is used to make a website using java, it will reduce the need for creating many instances of the Servlet class. Servlet code If you want to make a website using java, you can use Servlet code for making it. It will automatically compile your JSP file into a Servlet class. You can see how this works below: The browser sends a request to the server and the servlet responds with a page that contains the HTML form. A servlet uses the HTTP protocol to communicate with the browser. A client sends a request message to a servlet, which then sends a response back to the browser. A servlet has a header, which provides information about the request. Each header contains name-value pairs. You can access these values with methods like getRequestURI(), getQueryString(), and so on. You can also pass an object of type HttpServletResponse, which encapsulates a response message. JSF code The JSF framework can be used to build a website. It uses the JavaServer Pages Standard Tag Library (JSTL). The web container must provide the JAR files for JSTL. There are several ways to use the JSTL. Here are a few examples. The JSF component architecture provides a means for developers to create complex UI components on the web. It creates a component tree, which holds instances of UIComponents. The JSF framework uses these components to handle the application request and generate a rendered response. The framework provides an extensible architecture that enables developers to add other functionalities and customize component behaviors. The JSF standard defines numerous tags and advanced operations. One namespace, named h, provides replacements for common html tags. These tags are used to display data, which may be relational data. Can We Make Website Using Java? Read the full article

[simplexianpo]

SpringMVC Digging Road 2 - DispatcherServler + Controller

###Role of DispatcherServlet

 DispatcherServlet is the implementation of the front-end controller design pattern, which provides the centralized access point of SpringWebMVC, is responsible for the assignment of responsibilities, and can be seamlessly integrated with SpringIoC container, so as to obtain all the capabilities of Spring.

  DispatcherServlet is mainly used for duty scheduling, and it is mainly used for process control. Its main duties are as follows:

 ```

1：File upload resolution, if the request type is multipart, file upload resolution will be performed through MultipartResolver

2：Map the request to the processor through HandlerMapping (return a HandlerExecutionChain, which includes a processor and multiple HandlerInterceptor interceptors)

3：Many types of processors (processors in HandlerExecutionChain) are supported through HandlerAdapter

4：Resolve the logical view name to the concrete view implementation through ViewResolver

5：Localization analysis

6：Render a specific view

7：If an exception is encountered during execution, it will be handed over to HandlerExceptionResolver for resolution

```

###DispatcherServler Configure

DispatcherServlet can also configure its own initialization parameters, that is, <init-param> can be configured in servlet configuration.

###The relationship of context

The general context configuration of SpringWeb project is as follows:

  <listener>

<listener-class>

org.springframework.web.context.ContextLoaderListener

</listener-class>

</listener>

<context-param>

<param-name>contextConfigLocation</param-name>

<param-value>classpath:applicationContext.xml</param-value>

</context-param>

 ```

contextConfigLocation : Represents the configuration file path used to load Bean;

contextClass : Represents the ApplicationContext implementation class used to load Bean, the default WebApplicationContext```

###Initialization order of DispatcherServlet

```

1：HttpServletBean inherits HttpServlet, so its init method will be called when the Web container starts

2：FrameworkServlet inherits HttpServletBean, initialize the Web context through initServletBean ()

3：DispatcherServlet inherits FrameworkServlet, and implemented onRefresh () method to provide some front-end controller related configurations

```

>In the DispatcherServlet of SpringMVC framework, around line 470:

  /**

* This implementation calls {@link #initStrategies}.

*/

@Override

protected void onRefresh(ApplicationContext context) {

initStrategies(context);

}

  /**

* Initialize the strategy objects that this servlet uses.

* <p>May be overridden in subclasses in order to initialize further strategy objects.

*/

protected void initStrategies(ApplicationContext context) {

initMultipartResolver(context);

initLocaleResolver(context);

initThemeResolver(context);

initHandlerMappings(context);

initHandlerAdapters(context);

initHandlerExceptionResolvers(context);

initRequestToViewNameTranslator(context);

initViewResolvers(context);

initFlashMapManager(context);

}

 **The whole DispatcherServler initialization process mainly does two things:**  

> * Initialize the Web context used by SpringMVC, and possibly specify the parent container (ContextLoaderListener loads the root context)

> * Initialize the policy used by DispatcherServlet, such as HandlerMapping、HandlerAdapter

 ###DispatcherServler Default Configure：

 The default configuration of DispatcherServlet is in DispatcherServlet.properties (under the same package as DispatcherServlet class), and it is the default policy used when no configuration is specified in Spring configuration file.

It can be seen from the configuration that the DispatcherServlet will automatically register these special Bean when it starts, so we don't need to register. If we register, the default will not be registered.

   ###The special Bean which in DispatcherServlet

 DispatcherServlet uses WebApplicationContext as the context by default, and there are some Bean in this context as follows:

 ####Controller

Processor/page controller, doing C in MVC, but the control logic is transferred to the front-end controller for processing requests;

 ####HandlerMapping

The mapping from processor is requested, and if the mapping is successful, a HandlerExecutionChain object (including a Handler processor (page processor) object and multiple HandlerInterceptor interceptors) is returned; For example, BeanNameUrlHandlerMapping maps URL and Bean name, and the Bean that is successfully mapped is the processor here;

####HandlerAdapter：

HandlerAdapter will package the processor as an adapter, thus supporting many types of processors, that is, the application of adapter design pattern, thus easily supporting many types of processors; For example, SimpleControllerHandlerAdapter will adapt the Bean that implements the Controller interface and call the handleRequest method of the processor for functional processing;

####ViewResolver

The ViewResolver will resolve the logical View name into a concrete view, for example, the InternalResourceViewResoulver will map the logical view name into a jsp view;

####LocalResolver

Localized parsing, because Spring supports internationalization, the LocaleResolver parses the Locale information of the client to facilitate internationalization;

####ThemeResolver

Theme analysis, through which multiple styles of a page can be realized, that is, the common effect similar to software skin;

 ####MultipartResolver

File upload analysis, used to support file upload;

####HandlerExceptionResolver

Processor exception resolution, which can map exceptions to the corresponding agreed error interface, so as to display a user-friendly interface (instead of showing users specific error information);

####RequestToViewNameTranslator

Automatically mapping the request URL to the logical view name when the processor does not return the relevant information such as the logical view name;

####FlashMapManager

It is used to manage the policy interface of FlashMap, which is used to store the output of one request, and when entering another request, it is used as the input of the request, which is usually used to redirect the scene.

  ###Controller brief introduction

Controller, which is the part C in MVC, is mainly responsible for the function processing part

```

1、Collect, validate and bind request parameters to command objects

2、Give the command object to the business object, and the business object will process and return the model data

3、Return ModelAndView(Model model part is the model data returned by the business object, and the view part is the logical view name)

```

###DisaptcherServler + Controller

 DispatcherServlet is responsible for entrusting the request to the Controller for processing, and then selecting a specific view for rendering according to the logical view name returned by the Controller (and passing in the model data)

  **The complete C (including logic control and function processing) in MVC consists of (DispatcherServlet+Controller)

 ###Controllerannotation

Before Spring2.5, we all defined our processor class by implementing the Controller interface or its implementation class (which is no longer recommended).

Spring2.5 introduces annotated processor support, and defines processor classes through @Controller and @RequestMapping annotations. And provides a powerful set of annotations:

  > * @Controller

> * @RequestMapping

> * @RequestParam

> * @ModelAttribute

> * @SessionAttributes

> * @InitBinder

 Spring3.0 introduces Restful architecture style support (supported by @PathVariable annotation and some other features), and introduces more annotation support

  > * @CookieValue

> * @RequestHeader

> * @RequestBody

> * @ResponseStatus

> * @ExceptionHandler

> * @PathVariable

 Spring3.1 use new HandlerMapping and HandlerAdapter to support @Controller and @RequestMapping annotation processors, Use the combination of processor mapping RequestMappingHandlerMapping and processor adapter RequestMappingHandlerAdapter to replace the processor mapping defaultannotationhandlermapping and processor adapter AnnotationMethodHandlerAdapter started in Spring2.5.

  ###Annotation implementation Controller

The configure of HandlerMapping and HandlerAdapter  

> * Previous versions of Spring3.1:

DefaultAnnotationHandlerMapping and AnnotationMethodHandlerAdapter

> * The version starting with Spring3.1:

RequestMappingHandlerMapping and RequestMappingHandlerAdapter

 ###Example code:

Code structure reference:

https://blog.csdn.net/qq_33811662/article/details/80658813

 Modify the content of spring-mvc.xml as follows:

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xmlns:mvc="http://www.springframework.org/schema/mvc"

xmlns:context="http://www.springframework.org/schema/context"

xsi:schemaLocation="http://www.springframework.org/schema/beans

http://www.springframework.org/schema/beans/spring-beans-4.2.xsd

http://www.springframework.org/schema/mvc

http://www.springframework.org/schema/mvc/spring-mvc-4.2.xsd

http://www.springframework.org/schema/context

http://www.springframework.org/schema/context/spring-context-4.2.xsd">

<context:component-scan base-package="mvc1"></context:component-scan>

<mvc:annotation-driven></mvc:annotation-driven>

</beans>

 Modify the contents of HelloController as follows:

  package mvc1;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.servlet.ModelAndView;

@Controller

public class HelloController {

@RequestMapping("/hello")

public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception {

System.out.println("进入后台控制器");

ModelAndView mv = new ModelAndView();

mv.addObject("content", "SpringMVC 初体验");

mv.setViewName("/WEB-INF/jsp/hello.jsp");

return mv;

}

}

 Run the Server, enter the URL:

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Java - ambitious start. Create a real app! ##Edx ##UdemyFreeDiscountCoupons #ambitious #app #Create #Java #real #Start Java - ambitious start. Create a real app! WARNING: all the course videos (8+ hours, which are already recorded) will be published by the end of April, 2019. Yet another course about Java syntax and object-oriented programming? NOT EVEN A BIT! I assume you already know Java syntax, therefore I start with the most important tools for building real Java applications. Not Swing or an another unneeded thing. I teach what I missed at the beginning of my professional career - how to configure the app, how to plug external libraries, how to run everything. I show Maven with Maven Central Repository, Jetty, HttpServlet, Spring and Hibernate. I remember hard times figuring out what and where is hidden in the big codebase. I didn't understand multitier architecture back then. I focus on it here as well as on REST and CRUD operations. I follow best practices and point out things from the software craftmanship, like SOLID. I also know Java is not always the case. That's why I also show some pieces of SQL and front-end worlds. Who this course is for: Java developers who know Java basics Everyone who wants their first app Java developers who want to understand what's going on on their projects 👉 Activate Udemy Coupon 👈 Free Tutorials Udemy Review Real Discount Udemy Free Courses Udemy Coupon Udemy Francais Coupon Udemy gratuit Coursera and Edx ELearningFree Course Free Online Training Udemy Udemy Free Coupons Udemy Free Discount Coupons Udemy Online Course Udemy Online Training 100% FREE Udemy Discount Coupons https://www.couponudemy.com/blog/java-ambitious-start-create-a-real-app/

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[100% OFF] Develop Java MVC web apps using MyBatis, Servlets and JSP

[100% OFF] Develop Java MVC web apps using MyBatis, Servlets and JSP

What you Will learn ? Learn the basics of Mybatis Understand SQL-Mappers CURD operations using Mybatis Build a DAO layer using Mybatis Create a Java dynamic web application using Servlets Differentiate between GenericServlet and HttpServlet Understand servlet life cycle functions Read and process HTTP request (query string) parameters Understand different scopes – request, session and…

[tccicomputercoaching]

Learn generic servlet in Advance Java - tccicomputercoaching.com

Learn generic servlet in Advance Java – tccicomputercoaching.com

What is Generic Servlet class?

– This class implements Servlet and Servlet Config interfaces.

– It can be extended by a servlet.

– It is a common practice that a servlet class extends protocol-specific, such as HttpServlet

class.

– With the help of using life cycle methods, it makes simpler and easier to develop     servlets applications.

– To write a generic servlet, the developer need only to…

[digitallearning1505-blog]

8 Servlet & JSP HttpServlet Request and Response Object

[itsamilu-blog]

Java Servlet lifecycle

A servlet is managed through a well-defined life cycle that defines how it is loaded and instantiated, initialized, handled customer requests and removed from service. This  life cycle is expressed in the API by the init, service and destroy methods of the javax.servlet.Servlet interface that all servlets must implement directly or indirectly through the abstract classes GenericServlet or HttpServlet.

Stages of Servlet Lifecycle:

A servlet goes through the following stages in its life.

• Initialize

• Service

• Destroy

Initialize

When the servlet is created for the first time, it is in the start phase. The web server invokes the init () method of the servlet at this stage. It should be noted here that the init () is called only once and is not called for each request. As there is no constructor available in the servlet, this makes it be used for a single boot, as well as the init () method of the applet

Initialize stage has the following characteristics and usage

• Run once when the servlet loads for the first time

• Each customer request is not called

• The two previous points make the ideal location to perform the boot tasks performed in the constructor in a normal class.

Service

The service () method is the servlet mechanism, which actually processes the client's request. In each client request, the server generates a new subprocess and calls the service () method, as shown in the following figure. This makes it more efficient compared to technologies that become a single subprocess to respond to requests.

The following figure shows the version of the service cycle implementation. At the top of the diagram, we assume that the servlet is subclassing in GenericServlet (Remember, GenericServlet is used to build protocol-independent servlets). To provide the desired functionality, the service () method is replaced. The client sends a request to the Web server, a new chain is created to satisfy this request, followed by the call to the service () method. Finally, a response is prepared and sent back to the user according to the request. 

The second part of the figure illustrates a situation in which the servlet is made using the HttpServlet class. Now, this servlet can only serve HTTP requests. In these servlets, doGet () and doPost () are replaced to provide the desired behaviors. When a request is sent to the web server, the web server after creating a chain passes this request to the service () method. The Service () method checks the type of HTTP requests (GET, POST) and calls the doGet () or doPost method, depending on how the request is sent. After forming the response by the method doGet () or doPost (), the response is sent back to the service () method that is finally sent to the user by the web server.

 Destroy

The web server may decide to remove a previously loaded servlet instance, perhaps because it is explicitly requested by the server administrator, or the servlet container may be shut down or the servlet idle for a long time or the server may be overloaded. Before that, however, call the servlets destroy () method. This makes it a perfect place to release the acquired resources.

The following figure can help to summarize the life cycle of the Servlet

 The sever web creates a servlet instance. After the correct creation, the servlet enters the boot phase. Here, the init () method is invoked once. If the Web server fails in the previous two stages, the servlet instance is downloaded from the server. After the start stage, the servlet becomes available to satisfy customer requests and generate responses accordingly. Finally, the servlet is destroyed and downloaded from the web server.

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[mishradixit]

What topic will be covered in JAVA by a training Institute in Noida?

There are many institutes offer java course to provide best training but maximum are failed to covered important topic. It’s very tough to find the best training centers, but before this you have to know the most important topic of java which should be covered by every institute.

Being one of the best centre for Java training in Noida I have to tell something about Java.

1.       Web advancement with Java

Java has significant help for web progression. While Java on the work zone, with the specific abnormal instance of Eclipse RCP based application, was never an enormous accomplishment, Java is a great part of the time used on the server side.

Web progression:

In the event that you develop a web application (self-ruling of the programming vernacular you are using), you routinely put your web application on a committed server (and not your close-by PC). The web application continues running on the server and people can get to it there. The server is either a sound machine (with CPU, memory, hard circle, et cetera.) or a virtual server which is for the most part a machine which is detached by programming into little machines.

It is possible to use your adjacent PC as a server, yet as a rule you need a settled server which runs 24 hours for consistently, seven days for every week with the objective that web clients can accomplish your server under a pre-portrayed address.

Server versus cloud organization:

As opposed to running your application clearly on a devoted server, you could moreover run it in a cloud area. This cloud condition gives the indispensable server to your application. A case for this is the Google App Engine which licenses encouraging web applications written in different programming lingos.

Java web or Java EE compartment

Java web applications are usually not running direct on the server. Java web applications are running inside a web compartment on the server.

The compartment gives a runtime area to Java web applications. The chamber is for Java web applications what the JVM (Java Virtual Machine) is for neighborhood running Java applications. The board of trustees itself continues running in the JVM.

With everything taken into account, Java perceives two holders: the web compartment and the Java EE holder. Regular web holders in the Java world is Tomcat or Jetty. A web holder reinforces the execution of Java servlets and JavaServer Pages. A Java EE holder supports additional convenience, for example, transport of server stack.

 The more huge piece of the forefront Java web frameworks relies upon servlets. Unmistakable Java web frameworks are GWT, Java Training in Bangalore Java Server Faces, Struts and the spring structure. These web frameworks normally require as a base compartment a web holder.

2.            Java Web application

A Java web application is a social occasion of gainful resources, (for instance, Servlets, JavaServer Pages, Java classes and containers) and static resources (HTML pages and pictures). A Java web application can be passed on as a WAR (Web ARchive) record.

A WAR record is a packed report which contains the whole substance of the relating web application.

3.            Java Web Standards

Standard Java advancements are described utilizing a standard methodology called the Java Community Process (JCP). The going with changes are depicted utilizing the JCP.

Servlet:

A servlet is a Java class which extends "HttpServlet" and answers a HTTP request inside a web compartment. The latest expert shape is Servlets 3.0 which is furthermore part of Java EE 6. For unpretentious components see the Java Servlets 3.0 Spec.

Java Server Page:

Java Server Pages (JSP) is records which contain HTML and Java code. The web holder fuses the JSP into a servlet at the primary go through the JSP is gotten as well.

Java Server Pages Standard Tag Library:

The Java Server Pages Standard Tag Library (JSTL) epitomizes the inside convenience fundamental to many Web applications as significant marks. Java Training in Bangalore The present shape is 1.2 is a bit of the Java Server Pages Specification variation 2.1.

Starting with Java web change beginning with Java Web headway is tolerably straightforward. You can give it a shot using the going with Servlet and JSP Tutorial.

4.            Non-standard based Java Web Development

For Java, you in like manner find bundles of non-standard web change. For example, GWT supports the Java change and is accumulated into JavaScript. See the GWT Tutorial for more information.

[tutorialspointexamples]

Multi-project Java build

Multi-project Java build

Now let’s look at a typical multi-project build. Below is the layout for the project:

Example: Multi-project build - hierarchical layout

Build layout

multiproject/  api/  services/webservice/  shared/  services/shared/

Note: The code for this example can be found at samples/java/multiproject in the ‘-all’ distribution of Gradle.

Here we have four projects. Project api produces a JAR file which is shipped to the client to provide them a Java client for your XML webservice. Project webservice is a webapp which returns XML. Project shared contains code used both by api and webservice. Project services/shared has code that depends on the shared project.

Defining a multi-project build

To define a multi-project build, you need to create a settings file. The settings file lives in the root directory of the source tree, and specifies which projects to include in the build. It must be called settings.gradle. For this example, we are using a simple hierarchical layout. Here is the corresponding settings file:

Example: Multi-project build - settings.gradle file

settings.gradle

include "shared", "api", "services:webservice", "services:shared"

You can find out more about the settings file in Authoring Multi-Project Builds.

Common configuration

For most multi-project builds, there is some configuration which is common to all projects. In our sample, we will define this common configuration in the root project, using a technique called configuration injection. Here, the root project is like a container and the subprojects method iterates over the elements of this container - the projects in this instance - and injects the specified configuration. This way we can easily define the manifest content for all archives, and some common dependencies:

Example: Multi-project build - common configuration

build.gradle

subprojects {    apply plugin: 'java'    apply plugin: 'eclipse-wtp'    repositories {       mavenCentral()    }    dependencies {        testCompile 'junit:junit:4.12'    }    version = '1.0'    jar {        manifest.attributes provider: 'gradle'    } }

Notice that our sample applies the Java plugin to each subproject. This means the tasks and configuration properties we have seen in the previous section are available in each subproject. So, you can compile, test, and JAR all the projects by running gradle buildfrom the root project directory.

Also note that these plugins are only applied within the subprojects section, not at the root level, so the root build will not expect to find Java source files in the root project, only in the subprojects.

Dependencies between projects

You can add dependencies between projects in the same build, so that, for example, the JAR file of one project is used to compile another project. In the api build file we will add a dependency on the shared project. Due to this dependency, Gradle will ensure that project shared always gets built before project api.

Example: Multi-project build - dependencies between projects

api/build.gradle

dependencies {    compile project(':shared') }

See the section called “Disabling the build of dependency projects” for how to disable this functionality.

Creating a distribution

We also add a distribution, that gets shipped to the client:

Example: Multi-project build - distribution file

api/build.gradle

task dist(type: Zip) {    dependsOn spiJar    from 'src/dist'    into('libs') {        from spiJar.archivePath        from configurations.runtime    } } artifacts {   archives dist }

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[kenshu0401-blog]

土日でやること11/3,4,5

①ラムダ式ってなんぞや

無名関数かどうかで大きく挙動が異なるように見えるのを克服。返り値の型によって、apply()やtest()など様々あるっぽい。ひとまず、作ったラムダ式を.apply()で呼ぶ感覚。

②oracleのdmpインポートやエクスポートについての知識をちょいと。init.oraとかその辺も。

ToDo残ってます。

③angular.jsの::beforeとかの意味を調べる。

ToDo残ってます。

④ Java1.8をもう一度やろう。Functionクラスやラムダ式の使い方をおさらいしたい。StreamAPIはなんとなく分かるから後回し。お願い。やろうこれ。

①と同じ。一旦OK

⑤Springフレームワークについて、やっぱり一度見ておきたい。

ToDo残ってます。

⑥HttpClientクラスやHttpHost型など。

ToDo残ってます。

⑦たまに見る、Javaのカンマ区切りのフィールドはナンだ？？

enumのフィールドだった。enumもやんなきゃなあ

⑧アノテーションを自作する

⑨web.xmlとはなんぞや

http://www.searchman.info/java_eclipse/1050.html

⑩web.xmlとHttpServletを継承したクラスの関係性

doGetやdoPost、initをオーバーライドしている。このクラスをweb.xmlで指定することで、Webアプリケーションが成り立っているようだ。1回簡単なhello worldを表示するだけのような画面でも作っておいて仕組みを知っておきたい。

https://www.javadrive.jp/servlet/ini/index2.html

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[myquestionbank]

Java Interview Questions and Answers

Java Interview Questions and Answers

Write a program to show the functionality of servlets. – The servlets is being written like a normal application. The program is as follows: import java.io.*; import javax.servlet.*; import javax.servlet.http.*; public class HelloWWW extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {…

[tccicomputercoaching]

What is httpservletRequest and Response? tccicomputercoaching.com

What is HTTP servlet in Java?

Servlets are Java classes which service HTTP requests and implement the javax.servlet.Servlet interface. Web application developers typically write servlets that extend javax.servlet.http.HttpServlet, an abstract class that implements the Servlet interface and is specially designed to handle HTTP requests.

What is httpservletRequest and Response?

httpservletRequest:

Blueprint of an object to provide client request information to a servlet. The servlet container creates a ServletRequest object and sends it as an argument to the servlet's service method.

httpservletResponse

Defines an object to assist a servlet in sending a response to the client. The servlet container creates a ServletResponse object and passes it as an argument to the servlet's service method.

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