超大文件上传到服务器,实现流式传输,不再出现java.lang.OutOfMemoryError: Java heap space

 

特别注意: HttpURLConnection要使用sun.net.www.protocol.http.HttpURLConnection

参考地址:http://ferreousbox.javaeye.com/blog/157728 

 代码如下:

 1 FileInputStream fis =new FileInputStream(new File("本地文件地址"));
 2         URL dataUrl = new URL("上传url");
 3         HttpURLConnection con = (HttpURLConnection) dataUrl.openConnection();
 4         con.setRequestMethod("POST");
 5         con.setRequestProperty("Proxy-Connection", "Keep-Alive");
 6         con.setDoOutput(true);
 7         con.setDoInput(true);
 8         con.setChunkedStreamingMode(1024);
 9         OutputStream os=con.getOutputStream();
10         int rn2;  
11         byte[] buf2 = new byte[1024];  
12         while((rn2=fis.read(buf2, 0, 1024))>0)  
13         {     
14             os.write(buf2,0,rn2);    
15             System.out.println("上传了1024...");
16         }  
17         os.flush();  
18         os.close();  
19         fis.close();  
20         
21         InputStream is=con.getInputStream();
22         DataInputStream dis=new DataInputStream(is);
23         byte d[]=new byte[dis.available()];
24         dis.read(d);
25         String data=new String(d);
26         con.disconnect();
27         System.out.println(data);

 取返回值用下在这种方法会更好一点,上面的发现常出现取不到返回值的情况

 BufferedReader inss = new BufferedReader(new InputStreamReader(con.getInputStream()));  
        String line = null;  
        StringBuffer content= new StringBuffer();  
       while((line = inss.readLine()) != null){//line为返回值，这就可以判断是否成功、  
           content.append(line);  
       }  
       inss.close() ;  
       inss=null;  
       dataUrl = null;
       String data =content.toString();