【第9章】spring-mvc响应结果处理

文章目录

前言
一、准备
- 1. JSP
- 2. User
二、基础案例
- 1.设置属性
- 2.model
- 3. map
- 4.modelMap
- 5. modelAndView
三、扩展案例
- 1. header
- 2. cookie
- 3.session
- 4. json
- 5. object
总结

前言

这一章描述SpringMvc对于响应各种各样的处理以及其中遇到的问题。

一、准备

1. JSP

<%--Created by IntelliJ IDEA.User: 张军国001Date: 2024/5/1Time: 10:19To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head><title>Title</title>
</head>
<body>
<span>${requestScope.message}</span>
<span>${sessionScope.JSESSIONID}</span>
</body>
</html>

2. User

package org.example.springmvc.params.entity;import com.alibaba.fastjson2.annotation.JSONField;
import com.alibaba.fastjson2.annotation.JSONType;
import lombok.Getter;
import lombok.Setter;
import lombok.ToString;
import java.util.Date;
import java.util.List;
import java.util.Map;/*** Create by zjg on 2024/4/27*/
@Getter
@Setter
@ToString
@JSONType(ignores = "relatives")
public class User {private int id;private String name;@JSONField(format = "yyyy-MM-dd")private Date birth;private String[]alias;//外号private List<String>hobbies;//爱好private Map<String,String>relatives;//家人们private Role role;//角色private List<User> friends;//朋友们
}

二、基础案例

1.设置属性

http://localhost:8080/response01
http://localhost:8080/response02
http://localhost:8080/response03

package org.example.springmvc.params.controller;import com.alibaba.fastjson2.JSONObject;
import jakarta.servlet.http.Cookie;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.ModelAndView;
import java.util.Map;/*** Create by zjg on 2024/5/1*/
@Controller
public class ResponseController {String path="params/response";String key="message";//servlet@RequestMapping(value = "response01")public String response01(HttpServletRequest request){request.setAttribute(key,"HttpServletRequest");return path;}
}

2.model

http://localhost:8080/response02

//model
@RequestMapping(value = "response02")
public String response03(Model model){model.addAttribute(key,"Model");return path;
}

3. map

http://localhost:8080/response03

 //map
@RequestMapping(value = "response03")
public String response02(Map map){map.put(key,"Map");return path;
}

4.modelMap

http://localhost:8080/response04

 //modelMap
@RequestMapping(value = "response04")
public String response04(ModelMap modelMap){modelMap.addAttribute(key,"ModelMap");return path;
}

5. modelAndView

http://localhost:8080/response0

//modelAndView@RequestMapping(value = "response05")public ModelAndView response05(){ModelAndView mv=new ModelAndView(path);mv.addObject(key,"ModelAndView");return mv;}

三、扩展案例

1. header

http://localhost:8080/response06

//header
@RequestMapping(value = "response06")
public String response06(HttpServletResponse response){response.addHeader(key,"header");return path;
}

2. cookie

http://localhost:8080/response07

//cookie
@RequestMapping(value = "response07")
public String response07(HttpServletResponse response){response.addCookie(new Cookie("JSESSIONID","cookie"));return path;
}

3.session

http://localhost:8080/response08

//session
@RequestMapping(value = "response08")
public String response08(HttpServletRequest request){request.getSession().setAttribute("JSESSIONID","session");return path;
}

4. json

http://localhost:8080/response09

//json
@RequestMapping(value = "response09")
@ResponseBody
public JSONObject response09(){JSONObject jsonObject = new JSONObject();jsonObject.put("code",200);jsonObject.put("data","");jsonObject.put("message","请求成功");return jsonObject;
}

json这里遇到了一个406问题，我最开始的案例配置了mvc:annotation-driven/,后面引入json时又实现了WebMvcConfigurer这里导致冲突，把我json的配置又给覆盖掉了，这里我把mvc标签给去掉了。

5. object

//object
@RequestMapping(value = "response10")
@ResponseBody
public User response10(){User user=new User();user.setId(1);user.setName("爱丽丝");user.setBirth(new Date());return user;
}