关于文件上传？？

FileOutputStream  fileoutputstream  =  new  FileOutputStream(file);      while((sContentType  =  readLine(Linebyte,  ai,  servletinputstream,  CharacterEncoding))  !=  null){
        if(sContentType.indexOf(ContentType)  ==  0  &&  Linebyte[0]  ==  45)
          break;        if(s5  !=  null){
          fileoutputstream.write(outLinebyte,  0,  ai1[0]);
          fileoutputstream.flush();
        }
        s5  =  readLine(outLinebyte,  ai1,  servletinputstream,  CharacterEncoding);
        if(s5  ==  null ||  s5.indexOf(ContentType)  ==  0  &&  outLinebyte[0]  ==  45)
          break;
        fileoutputstream.write(Linebyte,  0,  ai[0]);
        fileoutputstream.flush();