MyEclipse搭建struts框架，并且实现登陆流程和拦截器使用(2)

最新推荐文章于 2018-05-07 18:00:08 发布

原创最新推荐文章于 2018-05-07 18:00:08 发布 · 1.6k 阅读

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#struts 拦截器

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上一篇介绍了，搭建struts框架和如何创建一个登陆流程，登陆成功跳转到欢迎页面，登陆失败跳转到登陆页面。

现在有这么一个需求，用拦截器实现，如果用户名为null,提示用户，用户名不能为空（此处用拦截器实现），然后返回登陆页面，如果用户名不为null ，再进入action的login方法进行下一步操作。

具体代码如下：

首先建立login.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
  <title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
</head>
   <body>
<font color="red" size="28">提示信息: ${tip}</font>
<form action="login.action" method="post">
用户名:<input name="username" id="username"/>
密码:<input name="password" id="password"/>
<input type="submit" value="登陆"/>
</form>
</body>
</html>

第二部建立welcome.jsp 登陆成功时跳转的界面

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title> yuewei's Welcome</title>

</head>
<body>
<h1>登录成功后显示此页面 ,欢迎你，${user} 你的密码是${password} </h1>
</body>
</html>

第三部，建立拦截器

package com.cn;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import org.apache.struts2.interceptor.ServletRequestAware;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.AbstractInterceptor;
public class LoginInterceptor extends AbstractInterceptor implements
ServletRequestAware {
@Override
public String intercept(ActionInvocation arg0) throws Exception {
Map request = (Map)ActionContext.getContext().get("request");
String username=(String) request.get("username");
if(username.equals("")){
request.put("tip", "大哥，用户名不能为null");
return "input";
}
return arg0.invoke();
}
@Override
public void setServletRequest(HttpServletRequest arg0) {
// TODO Auto-generated method stub
}
}

第四部建立LoginAction.java

package com.cn;
import java.util.Map;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
public class LoginAction extends ActionSupport {
/**
*
*/
private static final long serialVersionUID = 1L;
private String username;
private String password;

public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
private boolean isInvalid(String value) {
return (value == null || value.length() == 0);
}
public String execute() {
if (isInvalid(getUsername()))
return INPUT;
if (isInvalid(getPassword()))
return INPUT;
if (this.getUsername().equals("wangyonglin1123")
&& this.getPassword().equals("wangyonglin1123")||this.getUsername().equals("wangyonglinadmin")
&& this.getPassword().equals("wangyonglinadmin")) {
ActionContext.getContext().getSession().put("user",getUsername());
ActionContext.getContext().getSession().put("password",getPassword());
return "success";
}else{
Map request = (Map)ActionContext.getContext().get("request");
request.put("tip", "大哥，用户名和密码输入错误！");
}
return "error";
}
}

第五步，配置struts.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
<package name="authority" extends="struts-default">
<interceptors>
<interceptor name="loginInterceptor" class="com.cn.LoginInterceptor"></interceptor>

<interceptor-stack name="mydefault">
<interceptor-ref name="defaultStack" />
<interceptor-ref name="loginInterceptor" />
</interceptor-stack>
</interceptors>

<global-results>
<result name="input">/login.jsp</result>
</global-results>

<action name="login" class="com.cn.LoginAction">
<result name="success">/welcome.jsp</result>
<result name="error">/login.jsp</result>
<interceptor-ref name="mydefault"></interceptor-ref>
</action>
</package>
</struts>