方法一
可以通過在請求的時候加上參數，然后在servlet中獲取請求的參數，再去調用對應的方法。達到一個servlet處理多個請求的目的
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> <!-- 請求的時候加上對應的請求參數 --> <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 { //獲取對應的請求參數 String method = request.getParameter("method"); //根據請求參數去調用對應的方法。 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中配置為 *.do來響應多個請求
2. 在servlet中獲取servletPath。（例如/=add.do）
3. 去除/ 和.do，利用反射再去調用對應的方法。
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 { // 獲取方法名字 String servletPath = request.getServletPath();// /xxxxxx.do // 去掉斜杠和.do String methodName = servletPath.substring(1, servletPath.length() - 3);// xxxxxx try { // 利用反射獲取方法 Method method = getClass().getDeclaredMethod(methodName, HttpServletRequest.class, HttpServletResponse.class); // 執行相應的方法 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"); } }這樣一來不同的請求可以會用同一個servlet來處理，在servlet內部為不同的請求分別有不同的方法去處理。