struts2第一个实例

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struts2学习

Struts JSP XML Apache Web

struts2框架第一个实例

(1)新建web项目，在项目中添加struts2的核心类库。

     commons-logging-1.0.4.jar
     freemarker-2.3.13.jar
   ognl-2.6.11.jar
     struts2-core-2.1.6.jar
    xwork-2.1.2

commons-fileupload-1.2.1

其中如果缺少commens-fileupload-1.2.1这个jar包，tomcat在启动时就会报错Exception starting filter struts2
Unable to load configuration.

(2)web.xml中配置

<?xml version="1.0" encoding="UTF-8" ?> 
 <web-app id="WebApp_9" 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">
   <display-name>Struts</display-name> 
   <filter>
      <filter-name>**</filter-name>
      <filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
   </filter>
   <filter-mapping>
      <filter-name>**</filter-name>
      <url-pattern>*.action</url-pattern>
   </filter-mapping>
   
</web-app>

其中<filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>该类是在 struts2-core-2.1.6.jar中

(3)新建login.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!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=ISO-8859-1">
<title>login.jsp</title>
</head>
<body>
  <form action="login.action" method="post">
  userName:<input type="text" name="userName"><br>
  password:<input type="password" name="password"><br>
  <input type="submit" value="submit">
  </form>
</body>
</html>

(4)新建loginSuccess.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!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=ISO-8859-1">
<title>loginSuccess</title>
</head>
<body>
  userName:${requestScope.userName}<br>
  password:${requestScope.password}
</body>
</html>

(5)新建Action

public class LoginAction {
    private String userName = "";
    private String password = "";
	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;
	}
	
	public String execute() throws Exception{
		return "success";
	}
    
}

struts2中的action与struts1中的action完全不同，是一个普通的pojo。

由属性，属性的set,get方法，及execute()方法组成。而execute() 方法的返回值和名称是固定的。

(6)在src下新建struts.xml

<?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>
       <package name="login" extends="struts-default">
          <action name="login"  class="login.LoginAction">
            <result name="success" >/loginSuccess.jsp</result>
          </action>
       </package>

    </struts>

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