Struts访问web元素方法之---最常用的Ioc控制反转，依赖注入

package com.lsp.lookweb;

import java.util.Map;

import org.apache.struts2.interceptor.ApplicationAware;
import org.apache.struts2.interceptor.RequestAware;
import org.apache.struts2.interceptor.SessionAware;

import com.opensymphony.xwork2.ActionSupport;

/**
 *Ioc(控制反转)--推荐使用
 * 让Action类实现RequestAware、SessionAware、ApplicationAware接口，
 * 然后重写他们的set方法(setRequest、setSession、setApplication)，
 * 通过依赖注入、控制反转(原来自己控制，现在由别人来控制值。
 */
public class LookAction2 extends ActionSupport implements RequestAware,
        SessionAware, ApplicationAware {

    private Map<String, Object> session;
    private Map<String, Object> request;
    private Map<String, Object> application;

    public String LookAction2_() {
        request.put("r1", "r11");
        session.put("s1", "s11");
        application.put("a1", "a11");
        request.put("r2", "r22");
        return "LookAction2";
    }

    @Override
    public void setRequest(Map<String, Object> req) {
        // TODO Auto-generated method stub
        this.request = req;
    }

    @Override
    public void setSession(Map<String, Object> sess) {
        // TODO Auto-generated method stub
        this.session = sess;
    }

    @Override
    public void setApplication(Map<String, Object> app) {
        this.application = app;
    }

}