获取前端传过来的JSON格式的数据_前端读取json文件

日期：2023-06-10

1.获取前端传过来的JSON格式的数据

• 在SpringBoot中通过@RequestBody注解搭配实体类或者Map集合来接收Json数据。
• 通过Request获得流的方式来接收Json格式的数据，具体代码封装成一个工具类如下所示：

package com.hmdp.utils;

import cn.hutool.json.JSONObject;
import cn.hutool.json.JSONUtil;
import javax.servlet.http.HttpServletRequest;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class RequestWithJsonUtil {

    private HttpServletRequest request;

    public RequestWithJsonUtil(HttpServletRequest request) {
        this.request = request;
    }

    //获取一个字符串格式的
    public String getString(String key) throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(request.getInputStream()));
        StringBuilder stringBuilder = new StringBuilder();
        String line= null;
        while ((line=reader.readLine())!=null){
            stringBuilder.append(line);
        }
        String response = stringBuilder.toString();
        JSONObject jsonObject = JSONUtil.parseObj(response);
        String result = jsonObject.getStr(key);
        return result;
    }

    //获取任意格式的
    public Object get(String key) throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(request.getInputStream()));
        StringBuilder stringBuilder = new StringBuilder();
        String line= null;
        while ((line=reader.readLine())!=null){
            stringBuilder.append(line);
        }
        String response = stringBuilder.toString();
        JSONObject jsonObject = JSONUtil.parseObj(response);
        Object result = jsonObject.get(key);
        return result;
    }
}
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45

我们在使用的时候，只需要new出该工具对象并且传入request对象（HttpServltRequest），调用get或getString方法，写入想要获得的key即可。

 RequestWithJsonUtil map = new RequestWithJsonUtil(request);
        int type = (int) map.get("type");
        return type;
1
2
3