Struts2拦截器与Session使用详解-优快云博客

本文的拦截器部分是好的，但是session部分不对，这里有两个对的：

http://blog.youkuaiyun.com/weiyanghuadi/article/details/8931820

http://blog.youkuaiyun.com/weiyanghuadi/article/details/9050245

本文把拦截器和sessionAware写在一起了，本来觉得DummyAction类简单，让它实现了一个sessionAware借口，想看看struts2中的session,
无奈太简单了,以至于框架总是无法生成session对象。框架不给注入，我只好自己new一个Map，当然不起作用！

如果没有客户端请求，这里指提交表单，表单中的文本域要对应action中的属性，那么struts2控制器就不会产生Map对象.我按这个思路改，还是空空空！I am really breaking my head to get session object in my action class。When I get the session map using sessionaware interface, I get an empty map.

我是想：通过actionInvocation.getInvocationContext().getSession();获得struts2的session

package org.arpit.javapostsForLearning;

import java.util.HashMap;
import java.util.Map;
import javax.servlet.http.*;

import org.apache.struts2.ServletActionContext;
import org.apache.struts2.interceptor.SessionAware;
import com.opensymphony.xwork2.ActionSupport;

public class DummyAction extends ActionSupport implements SessionAware {
	
	private Map session2;
	private String justForHavingMapObject;

    public String execute()
    {
        System.out.println("   In Action");
        System.out.println(getJustForHavingMapObject());
        //如果下面直接用session.put，则有null exception
        //setSession(Map session);
        //this.session.put("kankan","liusir");
        NiMaNull();
        return SUCCESS;
    }
    
    //public Map getSession(){
    	//session=actionInvocation.getInvocationContext().getSession();
    	//return session;
   // }
    
    public void NiMaNull(){
    	//session.get("kanak");
    	//session.put("kankan","liusir");
    	System.out.println(getJustForHavingMapObject());
    	session2=new HashMap();
    	session2.put("kankan","liusir");
    }
    
    public void setSession(Map session3) {
		this.session2 = session3;
		//System.out.println(this.session.get("JSESSIONID"));
		System.out.println("who use setSession");
		
	}

	public String getJustForHavingMapObject() {
		return justForHavingMapObject;
	}

	public void setJustForHavingMapObject(String justForHavingMapObject) {
		System.out.println("inside setJustFor");
		this.justForHavingMapObject = justForHavingMapObject;
	}
}

package org.arpit.javapostsForLearning;

import java.util.Map;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.Interceptor;

public class FirstInterceptor implements Interceptor {

	@Override
	public void destroy() {

	}

	@Override
	public void init() {

	}

	@Override
	public String intercept(ActionInvocation actionInvocation) throws Exception {

		String startInterceptor = "   Start Interceptor 1";
		System.out.println(startInterceptor);
		/*
		 * Map session = actionInvocation.getInvocationContext().getSession();
		 * String temp=(String)session.get("kankan"); System.out.println(temp);
		 */
		String result = actionInvocation.invoke();
		Map session = actionInvocation.getInvocationContext().getSession();
		if (session == null) {
			System.out.println("no fucking session");
		} else {
			System.out.println("yes session");
		}
		String temp = (String) session.get("kankan");
		System.out.println(temp);
		String endInterceptor = "   End Interceptor 1";
		System.out.println(endInterceptor);
		return result;
	}

}

<body>
	<s:form action="Dummy">
		<s:textfield name="justForHavingMapObject"
			label="justForHavingMapObject" />
		<s:submit value="For calling Dummy Action" align="center" />
	</s:form>
</body>

<package name="default" extends="struts-default" namespace="/">
        <interceptors>
            <interceptor name="firstInterceptor"
                class="org.arpit.javapostsForLearning.FirstInterceptor" />
            <interceptor name="secondInterceptor"
                class="org.arpit.javapostsForLearning.SecondInterceptor" />

        </interceptors>
                
        <action name="Dummy" class="org.arpit.javapostsForLearning.DummyAction">
        <interceptor-ref name="firstInterceptor"/>
        <interceptor-ref name="secondInterceptor"/>
            <result name="success">Welcome.jsp</result>
            <result name="input">login.jsp</result>
        </action>
    </package>

原文：http://javapostsforlearning.blogspot.com/2012/07/struts-2-interceptors-with-example.html

源代码：http://pan.baidu.com/share/link?shareid=3673532014&uk=3878681452