bjsxt test_servlet

TestServlet.java

package com.bjsxt.servlet;

import java.io.IOException;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class TestServlet extends HttpServlet {

	@Override
	protected void service(HttpServletRequest req, HttpServletResponse res)
			throws ServletException, IOException {
		
		String currentURI = req.getRequestURI();
		System.out.println("currentURI=" + currentURI);
		
		String path = currentURI.substring(currentURI.indexOf("/", 1));
		
		path = path.substring(0, path.indexOf("."));
		
		System.out.println("path=" + path);
		
		String forwardPath = "";
		if ("/user/addUser".equals(path)) {
			Action action = new UserAddAction();
			forwardPath = action.execute(req, res);
//			System.out.println("---addUser---");
//			//取得表单数据
//			//调用业务逻辑
//			//转向
		}else if ("/user/modifyUser".equals(path)) {
			System.out.println("---modifyUser---");
			//取得表单数据
			//调用业务逻辑
			//转向
		}else if ("/user/queryUser".equals(path)) {
			Action action = new QueryUserAction();
			forwardPath = action.execute(req, res);
//			System.out.println("---queryUser---");
//			//取得表单数据
//			String username = req.getParameter("username");
//			UserManager userManager = new UserManager();
//			List userList = userManager.findUserByName(username);
//			req.setAttribute("userlist", userList);
//			
//			//转向到c.jsp，取出list中的数据
//			req.getRequestDispatcher("/a/b/c/c.jsp").forward(req, res);
		}
		
		/**
		 * <action-config>
		 * 		<action path="/user/addUser" class="com.bjsxt.servlet.UserAddAction" success="/add_success.jsp"/>
		 *      <action path="/user/queryUser" class="com.bjsxt.servlet.QueryUserAction" success="/a/b/c/c.jsp"/>
		 * </action-config> 
		 * 
		 *  Action action = (Action)具体Action实现
		 *  String forwardPath = action.execute(request, response);
		 *  
		 *  req.getRequestDispatcher(forwardPath).forward(req, res);
		 */
		
		req.getRequestDispatcher(forwardPath).forward(req, res);
	}
}

----------------------------------------------------------------------
Action.java

package com.bjsxt.servlet;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public interface Action {
	
	public String execute(HttpServletRequest req, HttpServletResponse res);
}

QueryUserAction.java

package com.bjsxt.servlet;

import java.util.List;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class QueryUserAction implements Action {

	public String execute(HttpServletRequest req, HttpServletResponse res) {
		System.out.println("---queryUser---");
		//取得表单数据
		String username = req.getParameter("username");
		UserManager userManager = new UserManager();
		List userList = userManager.findUserByName(username);
		req.setAttribute("userlist", userList);
		
		//转向到c.jsp，取出list中的数据
		//req.getRequestDispatcher("/a/b/c/c.jsp").forward(req, res);
		return "/a/b/c/c.jsp";
	}

}

UserAddAction.java

package com.bjsxt.servlet;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class UserAddAction implements Action {

	public String execute(HttpServletRequest req, HttpServletResponse res) {
		System.out.println("------------------addUser--------------------");
		return "/add_success.jsp";
	}

}

UserManager.java

package com.bjsxt.servlet;

import java.util.ArrayList;
import java.util.List;

public class UserManager {

	public List findUserByName(String name) {
		List userList = new ArrayList();
		userList.add("数据一");
		userList.add("数据二");
		return userList;
	} 
}

Web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" 
	xmlns="http://java.sun.com/xml/ns/j2ee" 
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
	xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee 
	http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
  
  <servlet>
  	<servlet-name>TestServlet</servlet-name>
  	<servlet-class>com.bjsxt.servlet.TestServlet</servlet-class>
  </servlet>
  
  <servlet-mapping>
  	<servlet-name>TestServlet</servlet-name>
  	<!-- 
  	<url-pattern>/servlet/TestServlet</url-pattern>
  	 -->
  	<url-pattern>*.do</url-pattern>
  	  <!-- 
  	<url-pattern>/servlet/*</url-pattern>
  	   -->
  </servlet-mapping>
</web-app>