使用Java将JSON数据推送到文件中

Question

我正在使用java调用REST API Get方法，并且需要将JSON数据存储到文件中。 这里是我的JSON数据：

{ 
"took" : 25, 
"timed_out" : false, 
"_shards" : { 
"total" : 5, 
"successful" : 5, 
"failed" : 0 
}, 
"hits" : { 
    "total" : 820, 
    "max_score" : 1.0, 
    "hits" : [ { 
    "_index" : "test", 
    "_type" : "status", 
    "_id" : "abc-2345-dadasasdasd214124", 
    "_score" : 1.0, 
    "_source": 
    {"A":1,"B":12,"C":122,"D":89,"E":120,"F":100,"G":2} 
    }, { 
    "_index" : "test", 
    "_type" : "status", 
    "_id" : "abc-2345-dadasasdasd214124", 
    "_score" : 1.0, 
    "_source": 
    {"A":54,"B":171,"C":102,"D":0,"E":120,"F":11,"G":20} 
} , { 
    "_index" : "test", 
    "_type" : "status", 
    "_id" : "abc-2345-dadasasdasd214124", 
    "_score" : 1.0, 
    "_source": 
    {"A":94,"B":8,"C":155,"D":32,"E":90,"F":11,"G":0} 
} ] 
} 
} 

这里是我的代码：

public class testcode { 

public static void main(String[] args) throws ClientProtocolException, IOException { 
     HttpClient client = new DefaultHttpClient(); 

     try { 
      HttpGet httpGetRequest = new HttpGet("http://localhost:8080/test_search?pretty=1"); 
      HttpResponse httpResponse = client.execute(httpGetRequest); 

      HttpEntity entity = httpResponse.getEntity(); 

      byte[] buffer = new byte[1024]; 
      if (entity != null) { 
      InputStream inputStream = entity.getContent(); 
      try { 
       int bytesRead = 0; 
       BufferedInputStream bis = new BufferedInputStream(inputStream); 
       FileWriter file = new FileWriter("/path/test.json"); 

       while ((bytesRead = bis.read(buffer)) != -1) { 
       String chunk = new String(buffer, 0, bytesRead); 
       System.out.println(chunk); 
       file.write(chunk); 


       } 
      } catch (Exception e) { 
       e.printStackTrace(); 
      } finally { 
       try { inputStream.close(); } catch (Exception ignore) {} 
      } 
      } 
     } catch (Exception e) { 
      e.printStackTrace(); 
     } finally { 
      client.getConnectionManager().shutdown(); 
     } 

} 

运行此代码后，我看到了JSON数据在我的控制台，但整个数据是没有得到保存到test.json文件。前两个数组完全保存，但只有第三个数组的一部分被保存到test.json中。

数据在test.json文件：

{ 
"took" : 25, 
    "timed_out" : false, 
    "_shards" : { 
    "total" : 5, 
    "successful" : 5, 
    "failed" : 0 
}, 
"hits" : { 
    "total" : 820, 
    "max_score" : 1.0, 
    "hits" : [ { 
    "_index" : "test", 
    "_type" : "status", 
    "_id" : "abc-2345-dadasasdasd214124", 
    "_score" : 1.0, 
    "_source": 
    {"A":1,"B":12,"C":122,"D":89,"E":120,"F":100,"G":2} 
    }, { 
    "_index" : "test", 
    "_type" : "status", 
    "_id" : "abc-2345-dadasasdasd214124", 
    "_score" : 1.0, 
    "_source": 
    {"A":54,"B":171,"C":102,"D":0,"E":120,"F":11,"G":20} 
    } , { 
    "_index" : "test", 
    "_type" : "status", 
    "_id" : "abc-2345-dadasasdasd214124", 
    "_score" : 1.0, 
    "_source": 
    {"A":94,"B":8,"C":155,"D":32,"E 

注：上面给出JSON数据是一个样本数据。真正的json文件包含大量数据。请指教。谢谢

Answer 1

还尝试确保FileWriter已关闭。

} finally { 
    try { file.close(); inputStream.close(); } catch (Exception ignore) {} 
} 

您的程序可能正在退出，而某些数据仍然被缓冲且尚未写入文件。