Java OkHttp 如何获取 Json 字符串？

How does OkHttp get Json string?

提问by Haifeng Zhang

Solution: It was a mistake on my side.

解决方案：这是我的错误。

The right way is response.body().string()other than response.body.toString()

正确的方法是response.body().string()而不是response.body.toString()

Im using Jetty servlet, the URL ishttp://172.16.10.126:8789/test/path/jsonpage, every time request this URL it will return

我使用 Jetty servlet，URL 是http://172.16.10.126:8789/test/path/jsonpage，每次请求这个 URL 都会返回

{"employees":[
    {"firstName":"John", "lastName":"Doe"}, 
    {"firstName":"Anna", "lastName":"Smith"},
    {"firstName":"Peter", "lastName":"Jones"}
]}

It shows up when type the url into a browser, unfortunately it shows kind of memory address other than the json string when I request with Okhttp.

它在浏览器中输入 url 时显示，不幸的是，当我使用Okhttp.

TestActivity﹕ com.squareup.okhttp.internal.http.RealResponseBody@537a7f84

The Okhttp code Im using:

我使用的 Okhttp 代码：

OkHttpClient client = new OkHttpClient();

String run(String url) throws IOException {
  Request request = new Request.Builder()
      .url(url)
      .build();

  Response response = client.newCall(request).execute();
  return response.body().string();
}

Can anyone helpe?

任何人都可以帮忙吗？

采纳答案by Newbies

try {
    OkHttpClient client = new OkHttpClient();
    Request request = new Request.Builder()
        .url(urls[0])
        .build();
    Response responses = null;

    try {
        responses = client.newCall(request).execute();
    } catch (IOException e) {
        e.printStackTrace();
    }
    String jsonData = responses.body().string();
    JSONObject Jobject = new JSONObject(jsonData);
    JSONArray Jarray = Jobject.getJSONArray("employees");

    for (int i = 0; i < Jarray.length(); i++) {
        JSONObject object     = Jarray.getJSONObject(i);
    }
}

Example add to your columns:

示例添加到您的列：

JCol employees  = new employees();
colums.Setid(object.getInt("firstName"));
columnlist.add(lastName);           

回答by Phillip Kigenyi

I hope you managed to obtain the json data from the json string.

我希望您设法从 json 字符串中获取 json 数据。

Well I think this will be of help

好吧，我认为这会有所帮助

try {
OkHttpClient client = new OkHttpClient();
Request request = new Request.Builder()
    .url(urls[0])
    .build();
Response responses = null;

try {
    responses = client.newCall(request).execute();
} catch (IOException e) {
    e.printStackTrace();
}   

String jsonData = responses.body().string();

JSONObject Jobject = new JSONObject(jsonData);
JSONArray Jarray = Jobject.getJSONArray("employees");

//define the strings that will temporary store the data
String fname,lname;

//get the length of the json array
int limit = Jarray.length()

//datastore array of size limit
String dataStore[] = new String[limit];

for (int i = 0; i < limit; i++) {
    JSONObject object     = Jarray.getJSONObject(i);

    fname = object.getString("firstName");
    lname = object.getString("lastName");

    Log.d("JSON DATA", fname + " ## " + lname);

    //store the data into the array
    dataStore[i] = fname + " ## " + lname;
}

//prove that the data was stored in the array      
 for (String content ; dataStore ) {
        Log.d("ARRAY CONTENT", content);
    }

Remember to use AsyncTask or SyncAdapter(IntentService), to prevent getting a NetworkOnMainThreadException

请记住使用 AsyncTask 或 SyncAdapter(IntentService)，以防止出现 NetworkOnMainThreadException

Also import the okhttp library in your build.gradle

还要在 build.gradle 中导入 okhttp 库

compile 'com.squareup.okhttp:okhttp:2.4.0'

compile 'com.squareup.okhttp:okhttp:2.4.0'

回答by Venkat Veeravalli

I am also faced the same issue

我也面临同样的问题

use this code:

使用此代码：

// notice string() call
String resStr = response.body().string().toString();    
JSONObject json = new JSONObject(resStr);

it definitely works

它绝对有效

回答by Kuldip Sharma

As I observed in my code. If once the value is fetched of body from Response, its become blank.

正如我在我的代码中观察到的那样。如果一旦从 Response 中获取了 body 的值，它就会变成空白。

String str = response.body().string();  // {response:[]}

String str1  = response.body().string();  // BLANK

So I believe after fetching once the value from body, it become empty.

所以我相信从 body 中获取一次值后，它就会变成空的。

Suggestion : Store it in String, that can be used many time.

建议：存放在String中，可以多次使用。

回答by Deven

Below code is for getting data from online server using GET method and okHTTP library for android kotlin...

下面的代码用于使用 GET 方法和 android kotlin 的 okHTTP 库从在线服务器获取数据...

Log.e("Main",response.body!!.string())

Log.e("Main", response.body!!.string())

in above line !! is the thing using which you can get the json from response body

在上面那一行！！是使用它可以从响应正文中获取 json 的东西

val client = OkHttpClient()
            val request: Request = Request.Builder()
                .get()
                .url("http://172.16.10.126:8789/test/path/jsonpage")
                .addHeader("", "")
                .addHeader("", "")
                .build()
            client.newCall(request).enqueue(object : Callback {
                override fun onFailure(call: Call, e: IOException) {
                    // Handle this
                    Log.e("Main","Try again latter!!!")
                }

                override fun onResponse(call: Call, response: Response) {
                    // Handle this
                    Log.e("Main",response.body!!.string())
                }
            })