struts2第一个实例
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>