我有一个restful端点，它在端点http://127.0.0.1:4567/suppliers上执行GET时提供以下JSON。
{
"status": "SUCCESS",
"jsonapi": {
"version": "1.0"
},
"data": {
"id": 0,
"type": "suppliers",
"name": "Red Network Energy LTD"
}
}
在httpPost请求中，我使用GSON将上述数据解析为SupplierResponseTest对象。执行时：
SupplierResponseTest supplierResponse = gson.fromJson(supplierJsonResponse, SupplierResponseTest.class);
我收到错误：
java.lang.IllegalStateException: Expected BEGIN_OBJECT but was BEGIN_ARRAY at line 1 column 57 path $.data
public SupplierResponseTest sendPostRequest(String supplierName){
SupplierResponseTest supplierResponse;
try (CloseableHttpClient httpClient = HttpClientBuilder.create().build()) {
//Create new object
SupplierTest supplier = new SupplierTest(supplierName);
//convert to Json
Gson gson = new Gson();
String requestBody = gson.toJson(supplier);
//set entity
HttpPost request = new HttpPost("http://127.0.0.1:4567/suppliers");
StringEntity params = new StringEntity(requestBody);
request.addHeader("content-type", "application/json");
request.setEntity(params);
HttpResponse result = httpClient.execute(request);
String supplierJsonResponse = EntityUtils.toString(result.getEntity(), "UTF-8");
supplierResponse = gson.fromJson(supplierJsonResponse, SupplierResponseTest.class);
return supplierResponse;
} catch (Exception e) {
String status = "";
System.out.println(e.getMessage());
System.out.println(e.getClass());
System.out.println(e.getStackTrace());
status = "NOK";
}
//return status;
return null;
}
对象如下。
package json.responses;
import com.google.gson.Gson;
public class SupplierResponseTest {
private StatusResponseTest status;
private ApiVersionResponseTest jsonapi;
private String message;
private ResponseDataTest data;
public SupplierResponseTest(StatusResponseTest status, ApiVersionResponseTest jsonapi) {
this.status = status;
this.jsonapi = jsonapi;
}
public SupplierResponseTest(StatusResponseTest status, ApiVersionResponseTest jsonapi, String data, String message) {
this.status = status;
this.jsonapi = jsonapi;
this.message = message;
//data which needs to take into account the array of suppliers
try{
Gson gson = new Gson();
this.data = gson.fromJson(data, ResponseDataTest.class);
}catch(Exception e){
System.out.println(e.getMessage());
}
}
public StatusResponseTest getStatus() {
return status;
}
public ApiVersionResponseTest getJsonapi() {
return jsonapi;
}
public String getMessage() {
return message;
}
//getData which needs to take into account the array of suppliers
public ResponseDataTest getData() {
return data;
}
}
答案 0 :(得分：0)
在课堂上 - SupplierResponseTest.java
将private ResponseDataTest data;替换为private ResponseDataTest[] data;
并将private StatusResponseTest status;替换为private String status;
与您的JSON回复一样，数据＆＃39;包含JSONArray
看看这段代码 -
package com.stack.example;
import com.google.gson.Gson;
public class SupplierResponseTest {
private String status;
private ApiVersionResponseTest jsonapi;
private String message;
private ResponseDataTest[] data;
public SupplierResponseTest(String status, ApiVersionResponseTest jsonapi) {
this.status = status;
this.jsonapi = jsonapi;
}
public SupplierResponseTest(String status, ApiVersionResponseTest jsonapi, String data, String message) {
this.status = status;
this.jsonapi = jsonapi;
this.message = message;
//data which needs to take into account the array of suppliers
try{
Gson gson = new Gson();
this.data = gson.fromJson(data, ResponseDataTest[].class);
}catch(Exception e){
System.out.println(e.getMessage());
}
}
public String getStatus() {
return status;
}
public ApiVersionResponseTest getJsonapi() {
return jsonapi;
}
public String getMessage() {
return message;
}
//getData which needs to take into account the array of suppliers
public ResponseDataTest[] getData() {
return data;
}
@Override
public String toString() {
return "SupplierResponseTest [status=" + status + ", jsonapi="
+ jsonapi + ", message=" + message + ", data=" + data + "]";
}
}
public class ApiVersionResponseTest {
private String version;
public ApiVersionResponseTest() {
super();
// TODO Auto-generated constructor stub
}
public ApiVersionResponseTest(String version) {
super();
this.version = version;
}
public String getVersion() {
return version;
}
public void setVersion(String version) {
this.version = version;
}
}
package com.stack.example;
public class ResponseDataTest {
private int id;
private String type;
private String name;
public ResponseDataTest() {
super();
// TODO Auto-generated constructor stub
}
public ResponseDataTest(int id, String type, String name) {
super();
this.id = id;
this.type = type;
this.name = name;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
package com.stack.example;
import com.google.gson.Gson;
public class Stack {
public static void main(String[] args) {
String jsonResponse = "{\"status\": \"SUCCESS\",\"jsonapi\": {\"version\": \"1.0\"},\"data\": ["
+ "{\"id\": 70,\"type\": \"suppliers\",\"name\": \"Blue Network Energy LTD\"},"
+ "{\"id\": 71,\"type\": \"suppliers\",\"name\": \"Red Network Energy LTD\"},"
+ "{\"id\": 72,\"type\": \"suppliers\",\"name\": \"Orange Network Energy LTD\"},"
+ "{\"id\": 73,\"type\": \"suppliers\",\"name\": \"Green Network Energy LTD\"}]}";
Gson gson = new Gson();
//Parse json into a SupplierResponseTest object.
SupplierResponseTest supplierResponse = gson.fromJson(jsonResponse, SupplierResponseTest.class);
System.out.println(supplierResponse);
}
}
希望这对你有用。