如何解决 Java resttemplate post 具有 map 而不是有效的 json 错误请求错误 400

Question

我正在编写一个 Spring 引导应用程序，它应该通过 POST-Request 向我的 REST-API 发送一个 JSON。

我的 Controller class 看起来像：

package com.example.workflow;

import jdk.jfr.ContentType;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

@RestController
public class CallController {

    @Autowired
    private CallService callService;

    @GetMapping("/calls")
    public List<Call> getAllCalls(){
        return callService.getAllCallList();
    }

    @PostMapping(value = "/calls")
    public void addCall(@RequestBody Call call){
        callService.addCall(call);
    }
}

我的服务 Class 看起来像：

package com.example.workflow;

import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

@Service
public class CallService {
    private List<Call> callList = new ArrayList<>(Arrays.asList(new Call("33333301","61","Test",
            "Test","Test","Test","Test","Test","Test","Test",
            "Test","Test","Test","Test","Test","Test","Test",
            "Test","Test","Test","Test","Test","Test",
            "Test","Test","Test","Test","Test","Test",
            "Test","Test","Test"),new Call("33333302","61","Test",
            "Test","Test","Test","Test","Test","Test","Test",
            "Test","Test","Test","Test","Test","Test","Test",
            "Test","Test","Test","Test","Test","Test",
            "Test","Test","Test","Test","Test","Test",
            "Test","Test","Test")));

    public List<Call> getAllCallList() {
        return callList;
    }

    public void addCall(Call call) {
        callList.add(call);
    }
}

我的 Model Class Call.java 就像：

package com.example.workflow;

public class Call {
    String tcpident, requestid, mclass, mno, errorstate, datalength, resourceid, ono, opos,
            wpno, opno, bufno, bufpos, carrierid, palletid, palletpos, pno, oposid, stepno,
            maxrecords, boxid, boxpos, mainopos, beltno, cno, boxpno, palletpno,aux1int,
            aux2int,aux1dint,aux2dint,mainpno;

    public Call() {
    }

    public Call(String tcpident, String requestid, String mclass, String mno, String errorstate, String datalength,
                String resourceid, String ono, String opos, String wpno, String opno, String bufno, String bufpos,
                String carrierid, String palletid, String palletpos, String pno, String oposid, String stepno,
                String maxrecords, String boxid, String boxpos, String mainopos, String beltno, String cno,
                String boxpno, String palletpno, String aux1int, String aux2int, String aux1dint,
                String aux2dint, String mainpno) {
        this.tcpident = tcpident;
        this.requestid = requestid;
        this.mclass = mclass;
        this.mno = mno;
....+getter and setter

现在我试图通过 Java 对我的 API 进行 POST-Call。 我正在使用 Resttemplate，但我只有一个 Map，如果我尝试进行 POST-Call，那么我将得到一个 HTTP 400 状态代码错误请求无效 Z0ECD11C1D7A287A201D148A23BBD7。

我尝试这样做：

public void post() throws JsonProcessingException {
        HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.APPLICATION_JSON);
        MultiValueMap<String, String> parameters = new LinkedMultiValueMap<>();
        parameters.add("tcpident","1");
        parameters.add("requestid","2");
        parameters.add("mclass","3");
        parameters.add("mno","4");
        parameters.add("errorstate","5");
        parameters.add("datalength","6");
        parameters.add("resourceid","1");
        parameters.add("ono","2");
        parameters.add("opos","3");
        parameters.add("wpno","23");
        parameters.add("opno","ddsds");
        parameters.add("bufno","d");
        parameters.add("bufpos","ds");
        parameters.add("carrierid","dsdd");
        parameters.add("palletid","dsd");
        parameters.add("palletpos","dsd");
        parameters.add("pno","dsd");
        parameters.add("oposid","ds");
        parameters.add("stepno","dsd");
        parameters.add("maxrecords","dsd");
        parameters.add("boxid","dsd");
        parameters.add("boxpos","dsd");
        parameters.add("mainopos","dsds");
        parameters.add("eltno","dsd");
        parameters.add("cno","dsd");
        parameters.add("boxpno","ds");
        parameters.add("palletpno","dsd");
        parameters.add("aux1int","ds");
        parameters.add("aux2int","ds");
        parameters.add("aux1dint","dsdsd");
        parameters.add("aux2dint","dsd");
        parameters.add("mainpno","dsod");
        HttpEntity<MultiValueMap<String, String>> request = new HttpEntity<>(parameters,headers);
        System.out.println("Headers:  "+request.getHeaders());
        System.out.println("Body:    "+request.getBody());
        //Call call = mapper.convertValue(request, Call.class);
        //Call call = restTemplate.postForObject("http://localhost:8080/calls", request,Call.class);
        ResponseEntity<Call[]> response = restTemplate.postForEntity("http://localhost:8080/calls", request, Call[].class);
    }

我打印的请求和标题是：

Headers:  [Content-Type:"application/json"]
Body:    {tcpident=[1], requestid=[2], mclass=[3], mno=[4], errorstate=[5], datalength=[6], resourceid=[1], ono=[2], opos=[3], wpno=[23], opno=[ddsds], bufno=[d], bufpos=[ds], carrierid=[dsdd], palletid=[dsd], palletpos=[dsd], pno=[dsd], oposid=[ds], stepno=[dsd], maxrecords=[dsd], boxid=[dsd], boxpos=[dsd], mainopos=[dsds], eltno=[dsd], cno=[dsd], boxpno=[ds], palletpno=[dsd], aux1int=[ds], aux2int=[ds], aux1dint=[dsdsd], aux2dint=[dsd], mainpno=[dsod]}

如果我通过 POSTMAN 对我的 RESTAPI 进行 POST-Call，它可以工作，我使用 JSON 像这样：

{
  "tcpident": "00110011",
  "requestid": 47,
  "mclass": false,
  "mno": null,
  "errorstate": null,
  "datalength": null,
  "resourceid": null,
  "ono": null,
  "opos": null,
  "wpno": null,
  "opno": null,
  "bufno": null,
  "bufpos": null,
  "carrierid": null,
  "palletid": null,
  "palletpos": null,
  "pno": null,
  "oposid": null,
  "stepno": null,
  "maxrecords": null,
  "boxid": null,
  "boxpos": null,
  "mainopos": null,
  "beltno": null,
  "cno": null,
  "boxpno": null,
  "palletpno": null,
  "aux1int": null,
  "aux2int": null,
  "aux1dint": null,
  "aux2dint": null,
  "mainpno": null
}

Answer 1

MultiValueMap应该用于发送具有媒体类型APPLICATION_FORM_URLENCODED的表单数据。 您的情况是 JSON 请求，您可以尝试使用JSONObject 。

例子：：

JSONObject jsonObject= new JSONObject();
jsonObject.put("tcpident", "00110011");
jsonObject.put("requestid", "47");
... more params

HttpEntity<String> request = 
  new HttpEntity<String>(jsonObject.toString(), headers);

 restTemplate.postForEntity("http://localhost:8080/calls", request, Call[].class);

Answer 2

已经尝试过： MultiValueMap<String, Object> parameters = new LinkedMultiValueMap<>(); ?