本文实例讲述了java实现分段读取文件并通过HTTP上传的方法。分享给大家供大家参考。具体如下:
1、首先将文件分段,用RandomAccessFile
2、分段后将分出的内容上传到http
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URL url = new URL(actionUrl);
HttpURLConnection con = (HttpURLConnection) url.openConnection();
/** 允许Input、Output,不使用Cache */
con.setDoInput( true );
con.setDoOutput( true );
con.setUseCaches( false );
/** 设定传送的method=POST */
con.setRequestMethod( "POST" );
/** setRequestProperty */
con.setRequestProperty( "Connection" , "Keep-Alive" );
con.setRequestProperty( "Charset" , "UTF-8" );
con.setRequestProperty( "Content-Type" ,
"multipart/form-data;boundary=" + boundary);
/** 设定DataOutputStream */
DataOutputStream ds = new DataOutputStream(con.getOutputStream());
ds.writeBytes(twoHyphens + boundary + end);
ds.writeBytes( "Content-Disposition: form-data; "
+ "name=\"file1\";filename=\"" + newName + "\"" + end);
ds.writeBytes(end);
/** 取得文件的FileInputStream */
FileInputStream fStream = new FileInputStream(uploadFile);
/** 设定每次写入1024bytes */
int bufferSize = 1024 ;
byte [] buffer = new byte [bufferSize];
int length = - 1 ;
/** 从文件读取数据到缓冲区 */
while ((length = fStream.read(buffer)) != - 1 )
{
/** 将数据写入DataOutputStream中 */
ds.write(buffer, 0 , length);
}
ds.writeBytes(end);
ds.writeBytes(twoHyphens + boundary + twoHyphens + end);
/** close streams */
fStream.close();
ds.flush();
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希望本文所述对大家的java程序设计有所帮助。