spring boot后端发送json数据和接收数据

前端请求数据接收

import com.alibaba.fastjson.JSON;
import io.swagger.annotations.*;
import org.springframework.web.bind.annotation.*;

@RestController
@RequestMapping("admin")
public class HelloCont {

    @ApiOperation("admin登录请求")
    @ResponseBody
    @PostMapping(value = "hello")
    // {"User":{"name":"mm","pawd":"1234"}}
    //{"name":"mm","pawd":"1234"}
    //{"name":"mm"}
    public String hello(@RequestBody String jsonString) {
        // {"User":{"name":"mm","pawd":"1234"}}为请求数据
        //先获取User的数据{"name":"mm","pawd":"1234"}为string
        String string= JSON.parseObject(jsonString).getString("User");
        //再通过User的值获取密码User，如果数据更多可以多次重复循环JSON.parseObject(string).getString("key");
        String string2= JSON.parseObject(string).getString("pawd");
    }
}

后端返回数据

import com.alibaba.fastjson.JSON;
import io.swagger.annotations.*;
import org.springframework.web.bind.annotation.*;

@RestController
@RequestMapping("admin")
public class HelloCont {

    @ApiOperation("admin登录请求")
    @ResponseBody
    @PostMapping(value = "hello")
    // {"User":{"name":"mm","pawd":"1234"}}
    //{"name":"mm","pawd":"1234"}
    //{"name":"mm"}
    public String hello(@RequestBody String jsonString) {
        //返回给前端的数据
        return "返回给前端的数据";
    }
}

合起来的样式

package 自己的链接;

import com.alibaba.fastjson.JSON;
import io.swagger.annotations.*;
import org.springframework.web.bind.annotation.*;

@RestController
@RequestMapping("admin")
public class HelloCont {

    @ApiOperation("admin登录请求")
    @ResponseBody
    @PostMapping(value = "hello")
    // {"User":{"name":"mm","pawd":"1234"}}
    //{"name":"mm","pawd":"1234"}
    //{"name":"mm"}
    public String hello(@RequestBody String jsonString) {
        // {"User":{"name":"mm","pawd":"1234"}}为请求数据
        //先获取User的数据{"name":"mm","pawd":"1234"}为string
        String string= JSON.parseObject(jsonString).getString("User");
        //再通过User的值获取密码User，如果数据更多可以多次重复循环JSON.parseObject(string).getString("key");
        String string2= JSON.parseObject(string).getString("pawd");
        System.out.println(string2);
        //返回给前端的数据
        return "你好！"+string2;
    }
}