Struts2中一个简单的入门实例

一.基本步骤:

1.准备struts2包:

最基本的五个jar包拷贝到WEB-INF的lib目录下,具体包名如下:

commons-logging-1.0.4.jar

freemarker-2.3.8.jar

ognl-2.6.11.jar

struts2-core-2.0.11.2.jar

xwork-2.0.5.jar

2.在web.xml注册和映射FilterDispatch
 org.apache.struts2.dispatcher.FilterDispatcher

3.login.jsp界面

 <form action="user!login.action">

4. 写UserAction类,不需要继承

5. 在一个配置文件struts.xml文件,放在src下面


  
二.一个action处理多个请求
   1. 在action中把execute方法删除或改名
   2. 创建自己的方法
   3. <form  action="user!login.action"
      这里本来是action="user.action"
      这里的login就是方法名
     
三.怎么使用request/ session
   1. 只要在action写一个属性,并生成set/get就会自动保存到request
   2. ActionContext.getContext().put("test2", "test2");   

具体代码如下:

建立项目名称:Struts2.

在src目录下.建立包com.struts2.action

在包下面建立一个UserAction类;

具体代码如下:

package com.struts2.action;
import com.opensymphony.xwork2.ActionContext;
public class UserAction {
	private String id;
	private String username;
	private String password;
	
	public String getId() {
		return id;
	}
	public void setId(String id) {
		this.id = id;
	}
	public String getUsername() {
		return username;
	}
	public void setUsername(String username) {
		this.username = username;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
	/**
	 * 登陆方法;
	 * @return String;
	 */
	@SuppressWarnings("unchecked")
	public String login(){
		this.id = "1001";
		
		//判断;
		if(this.username.equals("zhouhaitao") && this.password.equals("7290783")){
			//ActionContext.getContext.相当于request.setAttribuet()一样;
			ActionContext.getContext().put("id",id);
			
			//保存到session当中;
			ActionContext.getContext().getSession().put("name", this.username+"登陆成功!");
			return "yes";
		}else{
			return "no";
		}
	}
	
	/**
	 * 注册方法;
	 */
	public String regester(){
		System.out.println("调用注册的方法.开始注册!");
		System.out.println(this.id);
		System.out.println(this.username);
		System.out.println(this.password);
		ActionContext.getContext().put("name",this.username+"注册成功!");
		return "yes";
	}
}

之后,在src目录下:建立struts.xml文件.

内如如下:

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd" >
<struts>
	
	<!-- 可以引用其他的配置文件 -->
	<include file="struts-default.xml"></include>
		
	<!-- name代表包的名称 extends代表引用其他的默认文件,namespace代表命名空间,可选-->
	<package name="com.struts2.action" extends="struts-default">
		<!-- name 代表action名称,与struts1的path类似 -->
		<action name="user" class="com.struts2.action.UserAction">
			<result name="yes" type="dispatcher">success.jsp</result>
			<result name="no" type="redirect">failure.jsp</result>
		</action>
	</package>
</struts>

在WebRoot目录下:创建一个login.jsp页面

具体代码如下:

<%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Login Page</title>
<script type="text/javascript">
	//提交;
	function onSubmitLogin(){
		var username = document.getElementById("username");
		var password  = document.getElementById("password");
		var bol = false;
		if(username.value == ""){
			alert("用户名不能为空!");
			username.focus();
			bol = false;
			return;
		}

		if(password.value == "" || password.value.length <=0){
			alert("密码不能为空!");
			password.focus();
			bol=false;
			return;
		}

		if(bol=true){
			document.getElementById("myform").submit();
		}
	}
</script>
</head>
<body onload="document.getElementById('username').focus()">
	<center>
		<h1>用户登陆</h1>
		<form action="user!login.action" method="post" name="myform" id="myform">
			用户名:<input type="text" name="username">  <Br/>
			密码:  <input type="password" name="password"><Br/><Br/>
			<input type="button" value=" 登 陆 " onclick="onSubmitLogin()">&nbsp;&nbsp;&nbsp;
			<input type="reset" value=" 重 置 ">
		</form>
	</center>
</body>
</html>

建立一个success.jsp 页面 和failure.jsp页面。

<%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
</head>
<body>
	<font color="red"><h1>恭喜:${request.name }</h1></font>
	<Br/>
	<a href="http://localhost:8080/Struts2/regist.jsp">返回注册页面</a>&nbsp;&nbsp;&nbsp;&nbsp;
	<a href="http://localhost:8080/Struts2/login.jsp">返回登陆页面</a>
</body>
</html>

failure页面:

<%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
</head>
<body>
	<font color="red"><h1>抱歉,登陆失败!!</h1></font><br/>
	<a href="http://localhost:8080/Struts2/login.jsp">返回登陆页面</a>
</body>
</html>

配置web.xml文件、

代码如下:

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
  <display-name>Struts2</display-name>
  
  <filter>
  		<filter-name>struts2</filter-name>
  		<filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
  </filter>
  
  <filter-mapping>
  		<filter-name>struts2</filter-name>
  		<url-pattern>/*</url-pattern>
  </filter-mapping>
  
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>

在tomcat中部署,发布启动服务.

在流量器中运行:

http://localhost:8080/Struts2/login.jsp

然后,输入正确的用户名和密码.

ok。登陆成功!

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转载自zhouhaitao.iteye.com/blog/1095811