一个servlet处理多个请求

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方法一

可以通过在请求的时候加上参数，然后在servlet中获取请求的参数，再去调用对应的方法。达到一个servlet处理多个请求的目的

test.jsp:

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><title>My JSP 'test.jsp' starting page</title></head><body><!--请求的时候加上对应的请求参数-->    <a href="customerServlet?method=add"> Add</a>    <br>    <br>    <a href="customerServlet?method=query"> Query</a>    <br>    <br>    <a href="customerServlet?method=delete"> Delete</a></body></html>

CustomerServlet.java:

package com.aaa.mvcapp.servlet;import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class CustomerServlet extends HttpServlet {    private static final long serialVersionUID = 1L;    public void doGet(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        doPost(request, response);    }    public void doPost(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        //获取对应的请求参数        String method = request.getParameter("method");        //根据请求参数去调用对应的方法。        if ("add".equals(method)) {            add(request, response);        } else if ("query".equals(method)) {            query(request, response);        }        else if ("delete".equals(method)) {            delete(request, response);        }    }    private void delete(HttpServletRequest request, HttpServletResponse response) {        // TODO Auto-generated method stub        System.out.println("delete");    }    private void query(HttpServletRequest request, HttpServletResponse response) {        // TODO Auto-generated method stub        System.out.println("query");    }    private void add(HttpServletRequest request, HttpServletResponse response) {        // TODO Auto-generated method stub        System.out.println("add");    }}

方法二

1.在servlet的mapping中配置为 *.do来响应多个请求
2. 在servlet中获取servletPath。（例如/=add.do）
3. 去除/ 和.do，利用反射再去调用对应的方法。

web.xml(servlet配置):

  <servlet>    <servlet-name>CustomerServlet</servlet-name>    <servlet-class>com.aaa.mvcapp.servlet.CustomerServlet</servlet-class>  </servlet>  <servlet-mapping>    <servlet-name>CustomerServlet</servlet-name>    <url-pattern>*.do</url-pattern>  </servlet-mapping>

test.jsp:

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><title>My JSP 'test.jsp' starting page</title></head><body>    <a href="add.do"> Add</a>    <br>    <br>    <a href="query.do"> Query</a>    <br>    <br>    <a href="delete.do"> Delete</a></body></html>

CustomerServlet.java:

package com.aaa.mvcapp.servlet;import java.io.IOException;import java.lang.reflect.Method;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class CustomerServlet extends HttpServlet {    private static final long serialVersionUID = 1L;    public void doGet(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        doPost(request, response);    }    public void doPost(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        // 获取方法名字        String servletPath = request.getServletPath();// /xxxxxx.do        // 去掉斜杠和.do        String methodName = servletPath.substring(1, servletPath.length() - 3);// xxxxxx        try {            // 利用反射获取方法            Method method = getClass().getDeclaredMethod(methodName,                    HttpServletRequest.class, HttpServletResponse.class);            // 执行相应的方法            method.invoke(this, request, response);        } catch (Exception e) {            // TODO: handle exception        }    }    private void delete(HttpServletRequest request, HttpServletResponse response) {        // TODO Auto-generated method stub        System.out.println("delete");    }    private void query(HttpServletRequest request, HttpServletResponse response) {        // TODO Auto-generated method stub        System.out.println("query");    }    private void add(HttpServletRequest request, HttpServletResponse response) {        // TODO Auto-generated method stub        System.out.println("add");    }}

这样一来不同的请求可以会用同一个servlet来处理，在servlet内部为不同的请求分别有不同的方法去处理。

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