解析Json在Java中給出錯誤

-5

我試圖解析json字符串並獲取參數。但它給出了一個錯誤：請幫我解決這個問題。我知道有解析json許多問題和答案，但這次它不工作...解析Json在Java中給出錯誤

這是我的代碼：（我這種格式接收JSON）

//using this library 
import org.primefaces.json.JSONArray; 
import org.primefaces.json.JSONException; 
import org.primefaces.json.JSONObject; 

//this is how im receiving string - exactly same 
String jString = "\t\t\t\t\t\t\t\t\t\t\t{"msg":"directPaidout is true, but paidout password is wrong","sts":"2"}"; 


//replacing \t with "" 
jString = jString .replace("\t", ""); 

JSONObject jsonObject = new JSONObject(jString); 
String mString = jsonObject.getString("msg");

我「M收到此錯誤：

org.primefaces.json.JSONException: A JSONObject text must begin with '{' at character 1

這是我的全碼：

try { 
    String jString = doPost(toUrl, params); 
//Getting this string: 
// \t\t\t\t\t\t\t\t\t\t\t{"msg":"directPaidout is true, but paidout password is wrong","sts":"2"} 
    //replacing \t with "" 
    jString = jString .replace("\t", ""); 

    JSONObject jsonObject = new JSONObject(jString); 
    String mString = jsonObject.getString("msg"); 

    } catch (Exception e) { 
     System.out.println("Error: SEND: Exception in sending request!); 
     e.printStackTrace(); 
    } 

//This is post and get String method 
    public static String doPost(String url, String param) { 
     PrintWriter out = null; 
     BufferedReader in = null; 
     String result = ""; 
     try { 
      URL realUrl = new URL(url); 

      URLConnection conn = realUrl.openConnection(); 

      conn.setRequestProperty("accept", "*/*"); 
      conn.setRequestProperty("connection", "Keep-Alive"); 
      conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)"); 

      conn.setDoOutput(true); 
      conn.setDoInput(true); 

      out = new PrintWriter(conn.getOutputStream()); 

      out.print(param); 

      out.flush(); 

      in = new BufferedReader(new InputStreamReader(conn.getInputStream())); 
      String line; 
      while ((line = in.readLine()) != null) { 
       result += line; 
      } 
      //System.out.println("Res:" + result); 
     } catch (Exception e) { 
      System.out.println("POST EXc！" + e); 
      e.printStackTrace(); 
     } 

     finally { 
      try { 
       if (out != null) { 
        out.close(); 
       } 
       if (in != null) { 
        in.close(); 
       } 
      } catch (IOException ex) { 
       ex.printStackTrace(); 
      } 
     } 
     return result; 
    }

來源

2017-07-19 Abdulin

你在收到的錯誤信息中有什麼不清楚的地方？ –

@MarcinOrlowski它在問題末尾給出 – Abdulin

這不是一個字符串 – Mritunjay

-3

請看看，並嘗試這段代碼是否可以幫到你。你的字符串對象不能編譯。你必須像這樣脫離引號：\"否則它將不能編譯。

import org.primefaces.json.JSONObject; 

class Main { 
    public static void main(String[] args) { 
     String jString = "\t\t\t\t\t\t\t\t\t\t\t{\"msg\":\"directPaidout is true, but paidout password is wrong\",\"sts\":\"2\"}"; 
     jString = jString.replace("\t", ""); 
     JSONObject jsonObject = new JSONObject(jString); 
     String mString = jsonObject.getString("msg"); 
     System.out.println(mString); 
    } 
}

輸出

/usr/lib/jvm/java-1.8.0-openjdk-amd64/bin/java -javaagent:/opt/idea-IU-171.3780.107/lib/idea_rt.jar=40176:/opt/idea-IU-171.3780.107/bin -Dfile.encoding=UTF-8 -classpath /usr/lib/jvm/java-1.8.0-openjdk-amd64/jre/lib/charsets.jar:/usr/lib/jvm/java-1.8.0-openjdk-amd64/jre/lib/ext/cldrdata.jar:/usr/lib/jvm/java-1.8.0-openjdk-amd64/jre/lib/ext/dnsns.jar:/usr/lib/jvm/java-1.8.0-openjdk-amd64/jre/lib/ext/icedtea-sound.jar:/usr/lib/jvm/java-1.8.0-openjdk-amd64/jre/lib/ext/jaccess.jar:/usr/lib/jvm/java-1.8.0-openjdk-amd64/jre/lib/ext/localedata.jar:/usr/lib/jvm/java-1.8.0-openjdk-amd64/jre/lib/ext/nashorn.jar:/usr/lib/jvm/java-1.8.0-openjdk-amd64/jre/lib/ext/sunec.jar:/usr/lib/jvm/java-1.8.0-openjdk-amd64/jre/lib/ext/sunjce_provider.jar:/usr/lib/jvm/java-1.8.0-openjdk-amd64/jre/lib/ext/sunpkcs11.jar:/usr/lib/jvm/java-1.8.0-openjdk-amd64/jre/lib/ext/zipfs.jar:/usr/lib/jvm/java-1.8.0-openjdk-amd64/jre/lib/jce.jar:/usr/lib/jvm/java-1.8.0-openjdk-amd64/jre/lib/jsse.jar:/usr/lib/jvm/java-1.8.0-openjdk-amd64/jre/lib/management-agent.jar:/usr/lib/jvm/java-1.8.0-openjdk-amd64/jre/lib/resources.jar:/usr/lib/jvm/java-1.8.0-openjdk-amd64/jre/lib/rt.jar:/home/developer/IdeaProjects/sortarray/out/production/sortarray:/home/developer/Downloads/primefaces-6.1.jar Main 
directPaidout is true, but paidout password is wrong 

Process finished with exit code 0

來源

2017-07-19 07:00:58

好的，然後如何添加\之前？「請幫助我吧 – Abdulin

顯然，他編寫的代碼確實可以編譯，否則他不會得到他得到的錯誤，他問這個問題的方式很混亂，但他 – ajb

問題如果我定義字符串作爲你的例子它會工作，但字符串我接收工作，直到用json庫解析它 – Abdulin

-2

這是溶液：

if(jString .contains("{")){ 
jString = jString.substring(jString.indexOf("{")+0); 
}

替換（「\ t」的，「」）;增加了{

感謝您的支持！對此，我真的非常感激！

來源

2017-07-19 07:38:16 Abdulin

在這種情況下，json字符串是不像你說的那樣 –

解析Json在Java中給出錯誤

回答

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