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struts学习(八)—自定义拦截器

2017-03-16 19:19 239 查看

当浏览器中输入：

http://127.0.0.1:8080/strutslearn5/checkLogin时，向LoginAction发送请求，此请求会被LoginInterceptor 拦截，因为此时肯定没有用户的登录信息，因此会返回到login.jsp界面。

登录action

package test;

import com.opensymphony.xwork2.ActionSupport;

public class LoginAction extends ActionSupport{

public String execute(){
return SUCCESS;
}
}

自定义拦截器文件

package testInterceptor;

import java.util.Map;

import com.opensymphony.xwork2.Action;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.AbstractInterceptor;

public class LoginInterceptor extends AbstractInterceptor {

@Override
public String intercept(ActionInvocation ai) throws Exception {
Map session = ai.getInvocationContext().getSession();
String username = (String) session.get("user");
if(username!=null && username.length()>0){
return ai.invoke();
} else {
ActionContext ac = ai.getInvocationContext();
ac.put("popedom", "您还没有登陆");
return Action.LOGIN;
}
}

}

struts.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
"http://struts.apache.org/dtds/struts-2.3.dtd">

<struts>
<package name="testInterceptor" extends="struts-default" namespace="/">

<interceptors>
<interceptor name="checkLogin" class="testInterceptor.LoginInterceptor"></interceptor>
</interceptors>

<action name="checkLogin" class="test.LoginAction">
<result name="success">/success.jsp</result>
<result name="login">/login.jsp</result>
<interceptor-ref name="defaultStack"/>
<interceptor-ref name="checkLogin" />
</action>
</package>
</struts>

login.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>

<%@ taglib prefix="s" uri="/struts-tags"%>

<!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>登陆</title>
</head>
<body>
<center>
<s:property value="popedom" /> <!-- 定义信息输出标签 -->
<br /> <b>用户登录</b> <br />
<s:form>
<s:textfield label="用户名" name="username"></s:textfield>
<s:password  label="密码" name="password"></s:password>
<s:submit value="提交" ></s:submit>
</s:form>
</center>
</body>
</html>

success.jsp

<%@ 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>
登陆成功
</body>
</html>

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