工具目的:
使用servlet的缺点:
SpringMVC的不足之处:
因此,使用HttpServletUtil配合SpringMVC可以在SpringMVC类中通过注解注入工具类直接使用request对象、response对象、application对象和session对象,并且不用把这四个对象放在方法中声明便可以传参。
1、在springMVC的配置文件中添加具有HTTP协议的bean和开启springmvc的注解功能
2、编写工具类 HttpServletUtil.java
package com.gxwz.util;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
@Service
public class HttpServletUtil {
@Autowired
private HttpServletRequest request;
@Autowired
private HttpServletResponse response;
@Autowired
private HttpSession session;
@Autowired
private ServletContext application;
public HttpServletRequest getRequest() {
return request;
}
public HttpServletResponse getResponse() {
return response;
}
public HttpSession getSession() {
//return request.getSession();
return session;
}
public ServletContext getApplication() {
return application;
}
}
3、编写测试类 web.java
package com.gxwz.web;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import com.gxwz.util.HttpServletUtil;
@Controller
public class Web{
@Autowired
private HttpServletUtil httpServletUtil;
@RequestMapping("/web")
public String service() {
List list = new ArrayList();
list.add("公司大法官");
list.add("国史大纲");
list.add("根深蒂固");
HttpServletRequest request = httpServletUtil.getRequest();
HttpServletResponse response = httpServletUtil.getResponse();
HttpSession session = httpServletUtil.getSession();
ServletContext application = httpServletUtil.getApplication();
System.out.println("request:"+request);
System.out.println("response:"+response);
System.out.println("application:"+application);
System.out.println("sessionId:"+session.getId());
request.setAttribute("list", list);
session.setAttribute("list", list);
application.setAttribute("list", list);
return "web.jsp";
}
}
4、编写跳转页面 web.jsp 测试效果
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>
Insert title here
欢迎访问SpringMVC测试网页
使用EL表达式获取: ${list }
使用pageContext获取: ${pageContextScope.list }
使用application获取: ${applicationScope.list }
使用request获取: ${requestScope.list }
使用session获取: ${sessionScope.list }
5、运行效果
总结:
这样就可以使用工具直接使用servlet的三大作用域的对象了,是不是很方便!!!