struts2框架中的IoC详解

在struts2的Action中如何取得request ,session,application呢！

(一)取得Map类型的request,session,application

实现RequestAware,SessionAware,Application接口,通过IoC取得Map类型。示例如下：


package com.bjsxt.action;

 

import java.util.Map;

 

import javax.servlet.ServletContext;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpSession;

 

import org.apache.struts2.interceptor.ApplicationAware;

import org.apache.struts2.interceptor.RequestAware;

import org.apache.struts2.interceptor.SessionAware;

 

import com.opensymphony.xwork2.ActionSupport;

 

public class LoginAction1 extends ActionSupport implements RequestAware,

        SessionAware, ApplicationAware {

    // 声明username属性

    private String username;

    // 声明request属性

    private Map<String, Object> request;

    // 声明session属性

    private Map<String, Object> session;

    // 声明 application属性

    private Map<String, Object> application;

 

    // 重写execute方法，这里并没有使用ServletActionContext.getRequest()来获得request对象，这是因为实现了ServletRequestAware

    public String execute() throws Exception {

        request.put("req", "i am request arrt!!");

        session.put("session", "i am session attr");

        application.put("application", "i am application");

        return SUCCESS;

    }

 

    // Username的get方法

    public String getUsername() {

        return username;

    }

 

    // Username的set方法

    public void setUsername(String username) {

        this.username = username;

    }

 

    // 重写 RequestAware中的方法

    @Override

    public void setRequest(Map<String, Object> request) {

        // TODO Auto-generated method stub

        this.request = request;

 

    }

 

    // 重写 SessionAware中的方法

    @Override

    public void setSession(Map<String, Object> session) {

        // TODO Auto-generated method stub

        this.session = session;

 

    }

 

    // 重写 ApplicationAware中的方法

    @Override

    public void setApplication(Map<String, Object> application) {

        // TODO Auto-generated method stub

        this.application = application;

    }

 

(二)取得真实类型的HttpServletRequest,HttpSession,ServletContext

    实现ServletRequestAware,ServletContextAware接口，通过IoC取得真实类型。示例如下：

package com.bjsxt.action;

 

import javax.servlet.ServletContext;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpSession;

import org.apache.struts2.ServletActionContext;

import org.apache.struts2.interceptor.ServletRequestAware;

import org.apache.struts2.util.ServletContextAware;

import com.opensymphony.xwork2.ActionSupport;

public class LoginAction1 extends ActionSupport implements ServletRequestAware,ServletContextAware {

    //声明username属性

    private String username;

    //声明request属性

    HttpServletRequest request;

    //声明session属性

    HttpSession session;

    //声明 application属性

    ServletContext application;

 

    // 重写execute方法，这里并没有使用ServletActionContext.getRequest()来获得request对象，这是因为实现了ServletRequestAware

    public String execute() throws Exception {

        request.setAttribute("req", "i am request arrt!!");

        request.getSession().setAttribute("session", "i am session attr");

        application.setAttribute("application", "i am application");

        return SUCCESS;

    }

    //Username的get方法

    public String getUsername() {

        return username;

    }

    //Username的set方法

    public void setUsername(String username) {

        this.username = username;

    }

    //重写ServletContext中的方法

    @Override

    public void setServletContext(ServletContext application) {

        // TODO Auto-generated method stub

        this.application = application;

    }

    //重写ServletRequest中的方法

    @Override

    public void setServletRequest(HttpServletRequest request) {

        // TODO Auto-generated method stub

        this.request = request;

    }



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