java - 从 json 对象字符串转换为 Java 对象 om.google.gson.JsonSyntaxException

Question

我有一个关于将字符串解析为 java 对象的问题。我有这样的回应:

{
    "status": "success",
    "paginated": false,
    "data": [{
        "user": {
            "id": 21,
            "email": "kjhk@gmail.com",
            "access_token": "ai_wy-tTLLEyRCPAF86dWPJdQ77gefsTPwBkvtlEkNs",
            "test": []
        }
    }],
    "message": ""
}

我想获取状态

我创建了这个类并仅设置了状态，因为这是我想要的唯一字段，并且所有其余响应都不重要

package responseObjects;

import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
import com.fasterxml.jackson.annotation.JsonProperty;

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

public class LogInResponse {



    @JsonIgnoreProperties(ignoreUnknown = true)
    @JsonProperty("status")
    public String status;


    public String getStatus() {
        return status;
    }

    public void setStatus(String status) {
        this.status = status;
    }

}

在程序中，我发送请求并获取响应，但是当我尝试将其设置为 java 对象时，它失败了int 这一行LogInResponse res = gson.fromJson(response.body().toString(),LogInResponse.class);

public class TestMain {
    OkHttpClient client = new OkHttpClient();
    JsonObject bodyJson = new JsonObject();
    JsonObject responseJson = new JsonObject();

    MediaType JSON = MediaType.parse("application/json; charset=utf-8");

  public String httpPost(String url, String json) throws IOException {
        RequestBody body = RequestBody.create(MediaType.parse("application/json; charset=utf-8"), json);
        Request request = new Request.Builder()
                .url(url)
                .post(body)
                .build();
        Response response = client.newCall(request).execute();
        String  strResponse = response.body().string();
      JsonObject jsonObjectResponse = new JsonParser().parse(strResponse).getAsJsonObject();
    Gson gson = new Gson();
    LogInResponse res = gson.fromJson(response.body().toString(),LogInResponse.class);
        return response.body().string();
    }

这是异常(exception)

com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was STRING at line 1 column 1 path $

    at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:226)
    at com.google.gson.Gson.fromJson(Gson.java:927)
    at com.google.gson.Gson.fromJson(Gson.java:892)
    at com.google.gson.Gson.fromJson(Gson.java:841)
    at com.google.gson.Gson.fromJson(Gson.java:813)

有人可以告诉我出了什么问题吗？我如何从响应中获取状态？问候

Answer 1

来自 OkHttp 的有关 body() 的文档

Returns a non-null value if this response was passed to Callback.onResponse or returned from Call.execute. Response bodies must be closed and may be consumed only once.

也就是说，您使用它两次三次(包括您的 return 语句)。您已将其包含在 strResponse 中。继续使用那个。然后close()它，当你在它的时候。