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<![CDATA[Heck's Blog]]> https://www.heckjj.com/index.php zh-cn https://www.heckjj.com/httpclient-getresponsebodyasstream-stream-string/ <![CDATA[将输入流InputStream转换为String]]> Heck <@hecks.tk> Thu, 14 Apr 2011 16:16:54 +0000 https://www.heckjj.com/httpclient-getresponsebodyasstream-stream-string/ 最近项目中用apache的httpclient中get、post、put、delete方法去请求url而这些方法请求之后响应回的数据可能很大就调用getResponseBodyAsString()方法，而响应后的数据要转换成string类型，同里也在网上看到有人需要将InputStream转换为String对象，这里我要跟大家说一下，这样的InputStream需要从文本文件（即纯文本的数据文件）中读取内容，然后将它的内容读出到一个String对象中。我下面直接给出代码，然后讲解下。

package tk.hecks.blog.io;    
   
import java.io.BufferedReader;    
import java.io.IOException;    
import java.io.InputStream;    
import java.io.InputStreamReader;    
import java.util.Properties;    
   
public class StreamToString {    
   
    public static void main(String[] args) {    
         StreamToString sts = new StreamToString();    
            
        /* 
          * Get input stream of our data file. This file can be in the root of 
          * you application folder or inside a jar file if the program is packed 
          * as a jar. 
          */   
         InputStream is = sts.getClass().getResourceAsStream("/data.txt");    
   
        /* 
          * Call the method to convert the stream to string 
          */   
         System.out.println(sts.convertStreamToString(is));    
     }    
        
    public 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();    
     }    
}

如果大家学习过Java IO部分的API，相信大家对上面的代码应该比较容易理解。我大致的讲解下，主要讲解convertStreamToString方法，它是主要的转换方法。我们首先将InputStream转换为BufferedReader对象，该对象用于读取文本。然后我们就一行行的读取文本数据并加入到StringBuilder中（这里也可以用StringBuffer对象）。这里主要主意的地方是while的结束条件是当读取到的字符串为null。然后在最后将StringBuilder对象转换为字符串返回回去。

该代码大家可以自己运行下试试。希望能够帮助大家解决遇到的问题。
Tags - httpclientget , responsebodyasstream , inputstream转换为string ]]> https://www.heckjj.com/httpclient-getresponsebodyasstream-stream-string/#blogcomment <![CDATA[[评论] 将输入流InputStream转换为String]]> <user@domain.com> Thu, 01 Jan 1970 00:00:00 +0000 https://www.heckjj.com/httpclient-getresponsebodyasstream-stream-string/#blogcomment