1.新建项目user4,建立好和user3一样的目录,与之相比只是添加几个类,主要是struts.xml和action类的改变,其结果没有太大的变化
struts,xml
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.5//EN"
"http://struts.apache.org/dtds/struts-2.5.dtd"> <struts>
<package name="myPack" extends="struts-default" namespace="/">
<!--定义一个拦截器-->
<interceptors>
<interceptor name="loginInterceptor" class="com.nf.action.LoginInterceptor"></interceptor>
</interceptors> <global-results>
<result name="login" type="redirectAction">userAction_loginView</result>
</global-results> <action name="userAction_*" class="com.nf.action.UserAction" method="{1}">
<result name="loginViewSuccess">/WEB-INF/jsp/loginView.jsp</result>
<result name="success">/WEB-INF/jsp/index.jsp</result>
<result name="error">/WEB-INF/jsp/error.jsp</result>
<!--使用通配符后,新版本需要加上allowed-methods-->
<allowed-methods>login,loginView</allowed-methods>
</action> <action name="testAction" class="com.nf.action.TestAction">
<!-- name="success"是result的默认值-->
<result>/WEB-INF/jsp/test.jsp</result>
<!--引用拦截器-->
<interceptor-ref name="loginInterceptor"></interceptor-ref>
<!--系统自带的拦截器也要运行,因为还有其他赋值、转换、校验、国际化等功能-->
<interceptor-ref name="defaultStack"></interceptor-ref>
</action> <action name="newTestAction" class="com.nf.action.NewTestAction">
<result>/WEB-INF/jsp/new.jsp</result>
<!--引用拦截器-->
<interceptor-ref name="loginInterceptor"></interceptor-ref>
<!--系统自带的拦截器也要运行,因为还有其他赋值、转换、校验、国际化等功能-->
<interceptor-ref name="defaultStack"></interceptor-ref>
</action>
</package>
</struts>
action类UserAction不变,新增
package com.nf.action; import com.nf.entity.User;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.Interceptor; import java.util.Map; /*
定义拦截器有2种办法:
1.实现Interceptor接口
2.集成AbstractInterceptor抽象类
*/
public class LoginInterceptor implements Interceptor { public void destroy() {
System.out.println("最后销毁");
} public void init() {
System.out.println("初始化");
} public String intercept(ActionInvocation actionInvocation) throws Exception {
System.out.println("有请求到了");
System.out.println("进行校验,判断session是否为null");
ActionContext context = ActionContext.getContext();
Map<String, Object> session = context.getSession();
User user = (User) session.get("user");
if (user!=null){
System.out.println("我是保安,检查过,此客户已经登录过");
return actionInvocation.invoke();
}else {
System.out.println("我是保安,此客户没有登录过");
return "login";
} }
}
package com.nf.action; import com.nf.entity.User;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport; import java.util.Map; public class TestAction extends ActionSupport {
@Override
public String execute() throws Exception {
System.out.println("保安说,已经检查过,直接进入test.jsp");
return "success"; }
}
package com.nf.action; import com.opensymphony.xwork2.ActionSupport; public class NewTestAction extends ActionSupport {
@Override
public String execute() throws Exception { return "success";
}
}