spring的普通类中获取session和request对像

　

　　　在使用spring时,经常需要在普通类中获取session,request等对像.

1.第一钟方式，针对Spring和Struts2集成的项目:

在有使用struts2时,因为struts2有一个接口使用org.apache.struts2.ServletActionContext即可很方便的取到session对像.
用法:

ServletActionContext.getRequest().getSession();

例如:

        // 整合了Struts，所有用这种方式获取session中属性(亲测有效)
        User user = (User) ServletActionContext.getRequest().getSession().getAttribute("userinfo");//获取session中的user对象进而获取操作人名字

2.但在单独使用spring时如何在普通类中获取session,reuqest(亲测有效，注意:与struts整合之后下面方法失效，获取不到session中的值)

首先要在web.xml增加如下代码:(网上说需要这一步，我在IDEA中没有用这一步也成功了)

 <listener>
        <listener-class>org.springframework.web.context.request.RequestContextListener</listener-class>
 </listener>

第一种方式采用自动注入:

接着在普通类中:

    @Autowired//自动注入request
    private HttpServletRequest request;
    @Autowired
    private HttpSession session;

例如我的测试:

package cn.xm.jwxt.controller.system;

import cn.xm.jwxt.bean.system.User;
import cn.xm.jwxt.service.system.UserService;

import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import org.apache.log4j.Logger;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import java.sql.SQLException;
import java.util.List;

@Controller
public class UserAction {
    private Logger logger = Logger.getLogger(UserAction.class);
    @Autowired
    private UserService userService;
    @Autowired//自动注入request
    private HttpServletRequest request;
    @Autowired
    private HttpSession session;

    /**
     * 根据userCode查询user
     * @param userCode
     * @return
     */
    @RequestMapping("/findUserById.action")
    public @ResponseBody
    User findUserById(String userCode){
        User user = null;
        try {
            user = userService.findUserByUsercode(userCode);
            Object username = session.getAttribute("username");
            System.out.println(username.toString());
        } catch (SQLException e) {
            logger.error("根据userCode查询user出错",e);
        }
        return user;
    }
/**
     * 测试环境
     * @return
     */
    @RequestMapping("/test.action")
    public @ResponseBody
    String testEnv() {
        //通过自动注入session之后保存一个属性
        session.setAttribute("username","qlq");
        return "success";
    }
}

第二种方式使用RequestContextHolder获取:

            //获取request与session
            HttpServletRequest request = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest();
            HttpSession session = request.getSession(false);

例如我的测试:

package cn.xm.jwxt.controller.system;

import cn.xm.jwxt.bean.system.User;
import cn.xm.jwxt.service.system.UserService;

import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import org.apache.log4j.Logger;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import java.sql.SQLException;
import java.util.List;

@Controller
public class UserAction {
    private Logger logger = Logger.getLogger(UserAction.class);
    @Autowired
    private UserService userService;
    /**
     * 根据userCode查询user
     * @param userCode
     * @return
     */
    @RequestMapping("/findUserById.action")
    public @ResponseBody
    User findUserById(String userCode){
        User user = null;
        try {
            user = userService.findUserByUsercode(userCode);
            //获取request与session
            HttpServletRequest request = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest();
            HttpSession session = request.getSession(false);
            Object username = session.getAttribute("username");
            System.out.println(username.toString());
        } catch (SQLException e) {
            logger.error("根据userCode查询user出错",e);
        }
        return user;
    }/**
     * 测试环境
     * @return
     */
    @RequestMapping("/test.action")
    public @ResponseBody
    String testEnv() {
        //获取request与session
        HttpServletRequest request = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest();
        HttpSession session = request.getSession(false);
        session.setAttribute("username","qlq");
        return "success";
    }
}