Struts2 自定义拦截器

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1.自定义一个实现Interceptor的自定义拦截器类

package cn.gh.interceptor.myinter;import com.opensymphony.xwork2.ActionContext;import com.opensymphony.xwork2.ActionInvocation;import com.opensymphony.xwork2.interceptor.Interceptor;import java.util.Map;/** * Created by guo on 2017/10/25. */public class myinterseptor implements Interceptor {    public void destroy() {    }    public void init() {        System.out.println("自定义拦截器已启动--------");    }    public String intercept(ActionInvocation actionInvocation) throws Exception {        System.out.println("对象"+actionInvocation);        Object action = actionInvocation.getAction();        System.out.println("action是:======="+action);        String value;        //判定Session里的值是否存在        Map<String, Object> session = ActionContext.getContext().getSession();        Object uname = session.get("uname");        String actionName = actionInvocation.getProxy().getActionName();        actionInvocation.getProxy().getNamespace();//user        System.out.println("actionName========"+actionName);        if("login".equals(actionName)){            System.out.println("actionName是login==============");            value=actionInvocation.invoke();        }else if(uname!=null){            value=actionInvocation.invoke();            String method = actionInvocation.getProxy().getMethod();            System.out.println("已经登陆，执行的方法是"+method);        }else {            value="login";        }        return value;    }}

2.写一个实现Action接口的action类

package cn.gh.interceptor.action;import cn.gh.entity.User;import com.opensymphony.xwork2.Action;import com.opensymphony.xwork2.ActionContext;import com.opensymphony.xwork2.ModelDriven;import com.opensymphony.xwork2.util.ValueStack;import java.util.Map;public class UserAction implements Action, ModelDriven {    private User user;    public User getUser() {        return user;    }    public void setUser(User user) {        this.user = user;    }    public String execute() throws Exception {        Map<String, Object> session = ActionContext.getContext().getSession();        if (user!=null) {            if (user.getUsername().equals("1")&&user.getPassword().equals("1")) {                //省略一个步骤,记录session                session.put("uname",user.getUsername());                return SUCCESS;            }else {                return LOGIN;            }        }else {//不是从页面过来的            if (session!=null&&session.get("uname")!=null) {                return "success";            }else {                System.out.println("Action中的自定义代码");                return "login";            }        }    }    public User getModel() {        return user;    }}

3.写自己的strutsxml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>    <constant name="struts.devMode" value="true"></constant>    <package name="default" namespace="/" extends="struts-default">        <interceptors>            <interceptor name="myinter" class="cn.gh.interceptor.myinter.myinterseptor"></interceptor>            <interceptor-stack name="mystack">                <interceptor-ref name="defaultStack"></interceptor-ref>                <interceptor-ref name="myinter"></interceptor-ref>            </interceptor-stack>        </interceptors>        <default-interceptor-ref name="mystack"></default-interceptor-ref>        <global-results>            <result name="login">/login.jsp</result>        </global-results>      <!--  <action name="userAction" class="cn.gh.action.UserAction">            <result name="success">/success.jsp</result>        </action>-->    </package>   <!-- <include file="struts-02.xml"></include>    <include file="struts-03.xml"></include>    <include file="struts-04.xml"></include>    <include file="struts-05.xml"></include>-->    <include file="struts-06.xml"></include></struts>

<?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>    <constant name="struts.devMode" value="true"></constant>    <package name="action06" namespace="/" extends="default">        <action name="success" class="cn.gh.interceptor.action.SuccessAction">            <result name="success">/success.jsp</result>        </action>        <action name="login" class="cn.gh.interceptor.action.UserAction">            <result name="success">/success.jsp</result>            <result name="login">/login.jsp</result>        </action>    </package></struts>

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