Java中String与InputStream如何进行互相转换呢？

String转InputStream

String str = "java265.com是最好的java学习网站";
InputStream   in_nocode   =   new   ByteArrayInputStream(str.getBytes());   
InputStream   in_withcode   =   new   ByteArrayInputStream(str.getBytes("UTF-8"));  

InputStream转换为String

方式1：
  public String convertStreamToString(InputStream is) {   
   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();
    }   

方式2:
public   String   inputStream2String   (InputStream   in)   throws   IOException   { 
        StringBuffer   out   =   new   StringBuffer(); 
        byte[]   b   =   new   byte[4096]; 
        for   (int   n;   (n   =   in.read(b))   !=   -1;)   { 
                out.append(new   String(b,   0,   n)); 
        } 
        return   out.toString(); 
} 

方式3:
public   static   String   inputStream2String(InputStream   is)   throws   IOException{ 
        ByteArrayOutputStream   baos   =   new   ByteArrayOutputStream(); 
        int   i=-1; 
        while((i=is.read())!=-1){ 
        baos.write(i); 
        } 
       return   baos.toString(); 
}