将输入流InputStream转换为String

public static String convertStreamToString(InputStream is) {      
        /*  
          * To convert the InputStream to String we use the BufferedReader.readLine()  
          * method. We iterate until the BufferedReader return null which means  
          * there's no more data to read. Each line will appended to a StringBuilder  
          * and returned as String.  
          */     
         BufferedReader reader = new BufferedReader(new InputStreamReader(is));      
         StringBuilder sb = new StringBuilder();      
     
         String line = null;      
        try {      
            while ((line = reader.readLine()) != null) {      
                 sb.append(line + "\n");      
             }      
         } catch (IOException e) {      
             e.printStackTrace();      
         } finally {      
            try {      
                 is.close();      
             } catch (IOException e) {      
                 e.printStackTrace();      
             }      
         }      
     
        return sb.toString();      
     } 

 二、推荐一个jar包，用来转换InputStream到String，代码示例如下：

// 引入apache的io包
import org.apache.commons.io.IOUtils;

InputStream in = con.getInputStream();
String result = IOUtils.toString(in, "UTF-8");