实现Servlet程序的三种方法(小结)

实现Servlet程序的三种方法(小结)

实现Servlet程序的三种方法

1.手动实现Servlet程序

1.编写一个类去实现Servlet接口

2.实现service方法，处理请求并响应数据

示例代码：

//HelloServlet.java

package servlet;

import javax.servlet.*;

import java.io.IOException;

public class HelloServlet implements Servlet {

@Override

public void init(ServletConfig servletConfig) throws ServletException {

}

@Override

public ServletConfig getServletConfig() {

return null;

}

// service方法专门来处理请求和响应

@Override

public void service(ServletRequest servletRequest, ServletResponse servletResponse) throws ServletException, IOException {

System.out.println("Hello,Servlet! 被访问了");

}

@Override

public String getServletInfo() {

return null;

}

@Override

public void destroy() {

}

}

3.到web.xml配置Servlet程序的访问地址

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

xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"

version="4.0">

HelloServlet

servlet.HelloServlet

HelloServlet

/hello

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

xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"

version="4.0">

HelloServlet

servlet.HelloServlet

HelloServlet

/hello

2.通过HttpServlet实现Servlet程序

在一般项目开发中一般很少使用Servlet接口来实现Servlet程序，一般都是使用继承HttpServlet类的方式去实现Serlvet程序

步骤：

1.编写一个类去继承HttpServlet类

2.根据需要重写doGet和doPost方法

3.去web.xml去配置访问地址

4.最后运行测试就可以接收到值了

示例代码：

//HttpServlet.java

package servlet;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import java.io.IOException;

//继承HttpServlet

public class HttpServlet02 extends HttpServlet {

@Override

protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

System.out.println("doGet方法");

}

@Override

protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

System.out.println("doPost方法");

}

}

```css

```bash

```handlebars

```sql

```javascript

//web.xml

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

xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"

version="4.0">

HelloServlet

servlet.HelloServlet

HelloServlet

/hello

HelloServlet02

servlet.HttpServlet02

HelloServlet02

/hello02

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

xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"

version="4.0">

HelloServlet

servlet.HelloServlet

HelloServlet

/hello

HelloServlet02

servlet.HttpServlet02

HelloServlet02

/hello02

3.通过IDEA自动生成Servlt程序

1.通过IDEA新建一个Servlet

2.之后再新生成的java文件中我们自己按需要配置就好了

3.老样子，依旧是在web.xml中配置好

4.写个按钮来检测配置结果

示例代码：

//HelloServlet.java

package servlet;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import java.io.IOException;

public class HelloServlet03 extends HttpServlet {

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

System.out.println("通过IDEA自动/doGet方法");

}

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

System.out.println("通过IDEA自动/doGet方法");

}

}

//web.xml

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

xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"

version="4.0">

HelloServlet

servlet.HelloServlet

HelloServlet

/hello

HelloServlet02

servlet.HttpServlet02

HelloServlet02

/hello02

HelloServlet03

servlet.HelloServlet03

HelloServlet03

/hello03

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

xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"

version="4.0">

HelloServlet

servlet.HelloServlet

HelloServlet

/hello

HelloServlet02

servlet.HttpServlet02

HelloServlet02

/hello02

HelloServlet03

servlet.HelloServlet03

HelloServlet03

/hello03

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