JavaWeb -- Struts 自定义拦截器， 登录权限拦截
1. 自定义拦截器， 登录权限拦截
login.jsp 登录JSP
<%@ page language="java" contentType="text/html; charset=utf-8"%> <%@taglib uri="/struts-tags" prefix="s"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>login.jsp</title> </head> <body> <s:form action="LoginAction_reg" name="login"> <s:textfield name="name" label="UserName" /> <s:submit /> </s:form> </body> </html>
LoginAction.java 登录处理action
/**
* 登录action
*/
public class LoginAction extends ActionSupport implements SessionAware{
private static final long serialVersionUID = -6933309304624396640L;
public String name;
/* 接受session中的map */
private Map<String, Object> sessionMap;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String reg() {
if("tom".equals(name)){
//存放登录信息
sessionMap.put("username", name);
}
else{
//回到登录页面
return LOGIN ;
}
return "success";
}
public String toLoginView() {
System.out.println("toRegView");
return "loginView";
}
/**
* 注入session map
*/
public void setSession(Map<String, Object> session) {
this.sessionMap = session ;
}
}
LoginInterceptor.java 拦截器
/**
* 登录拦截器
*/
public class LoginInterceptor implements Interceptor {
private static final long serialVersionUID = 286019271181543787L;
public void destroy() {
}
public void init() {
}
public String intercept(ActionInvocation invocation) throws Exception {
Object action = invocation.getAction();
//如果是达到登录或者注册的action,则直接放行
if(action instanceof LoginAction || action instanceof RegAction){
return invocation.invoke();
}
Map<String, Object> sessionMap = invocation.getInvocationContext().getSession();
//如果没有登录
if(sessionMap.get("username") == null){
return "login" ;
}
//放行
else{
return invocation.invoke();
}
}
}
login.xml ,action interceptor 注册配置， 需要加到struts.xml (include)
<?xml version="1.0"?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.1.7//EN"
"http://struts.apache.org/dtds/struts-2.1.7.dtd">
<struts>
<package name="LoginPkg" namespace="/login" extends="struts-default">
<interceptors>
<!-- 注册拦截器 -->
<interceptor name="loginInterceptor" class="cn.itcast.struts2.interceptor.LoginInterceptor" />
<!-- 自定义拦截器栈 -->
<interceptor-stack name="loginStack">
<interceptor-ref name="loginInterceptor" />
<interceptor-ref name="defaultStack" />
</interceptor-stack>
</interceptors>
<!-- 定义默认栈 -->
<default-interceptor-ref name="loginStack" />
<!-- 定义全局结果 -->
<global-results>
<result name="login">/login.jsp</result>
</global-results>
<!-- 注册登录action -->
<action name="LoginAction_*" class="cn.itcast.struts2.interceptor.LoginAction" method="{1}">
<result name="success">/success.jsp</result>
<result name="loginView">/login.jsp</result>
</action>
</package>
</struts>
