Java 使用POST方法发送JSON对象

您好，我正在尝试使用post方法发送json对象，上面是代码，但我收到内部服务器错误500。我在发送一些意外数据时读取了它的显示。实际上，这是OAuth实现，我必须在用户帐户中添加一个文件夹。我已成功检索访问令牌。请建议代码中的错误所在

• “文件夹={'name'：'testcreation folder'}”

  是无效的JSON。JSON

  字符串

  必须用双引号（

  “

  ）括起来。我想你的意思是：

    @Override
      public void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
  
          Intent in=getIntent();
  
          Uri uri=in.getData();
  
              // l.setText(uri.toString());
               String p=uri.getQueryParameter(OAuth.OAUTH_VERIFIER);
               CreateFolderActivity.m_provider.setOAuth10a(true);
               try {
                  CreateFolderActivity.m_provider.retrieveAccessToken(p);
              } catch (OAuthMessageSignerException e) {
                  // TODO Auto-generated catch block
                  e.printStackTrace();
              } catch (OAuthNotAuthorizedException e) {
                  // TODO Auto-generated catch block
                  e.printStackTrace();
              } catch (OAuthExpectationFailedException e) {
                  // TODO Auto-generated catch block
                  e.printStackTrace();
              } catch (OAuthCommunicationException e) {
                  // TODO Auto-generated catch block
                  e.printStackTrace();
              }
               URL url = null;
                  try {
                      url = new URL("http://api.mendeley.com/oapi/library/folders?consumer_key=" + CreateFolderActivity.m_consumer_key);
  
  
                  } catch (MalformedURLException e1) {
                      // TODO Auto-generated catch block
                      e1.printStackTrace();
                  }
                  HttpURLConnection hc=null;
                  try {
                      hc=(HttpURLConnection)url.openConnection();
                      try {CreateFolderActivity.m_consumer.sign(hc);
  
                          hc.setRequestMethod("POST");
                          hc.setDoInput(true);
                          hc.setDoOutput(true);
                          hc.setUseCaches(false); 
  
                          hc.setRequestProperty("Content-type","text/json; charset=utf-8"); 
                          OutputStreamWriter wr = new OutputStreamWriter(hc.getOutputStream());
                          wr.write("folder = {'name' : 'Test creation folder'}");
  
                          wr.flush();
  
                          // Get the response
                       /*   BufferedReader rd = new BufferedReader(new InputStreamReader(hc.getInputStream()));
                          String strResponse = null;
                          for (String strLine = ""; strLine != null; strLine = rd.readLine()) 
                              strResponse += strLine ;*/
                          Log.i("HelloWorld",hc.getResponseMessage()+"    "+hc.getResponseCode());
                      } catch (OAuthMessageSignerException e) {
                          // TODO Auto-generated catch block
                          e.printStackTrace();
                      } catch (OAuthExpectationFailedException e) {
                          // TODO Auto-generated catch block
                          e.printStackTrace();
                      }
                  } catch (IOException e) {
                      // TODO Auto-generated catch block
                      e.printStackTrace();
                  }
  
  
    }
    }`
  

• 正确的JSON mime类型是

  application/JSON

• 不要手工构建JSON。使用包。首先查看

  JSONObject

  和

  JSONArray

例如：

{
    "folder": {
        "name": "Test creation folder"
    }
}

---

@SahilMuthoo你能检查一下我的问题吗[

hc.setRequestProperty("content-type","application/json; charset=utf-8"); 
OutputStreamWriter wr = new OutputStreamWriter(hc.getOutputStream());
JSONObject data = new JSONObject().put("folder",
                  new JSONObject().put("name", "test creation folder"));
wr.write(data.toString());