android上传图片到服务器，求服务器那边和android的Activity的完整代码。

服务器端servlet代码：
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

//获取输入流，是HTTP协议中的实体内容
ServletInputStream sis=request.getInputStream();

File file = new File(request.getSession().getServletContext().getRealPath("/img/"),"img_"+0+".jpg");
for (int imgnum = 0;file.exists();imgnum++)
{
file = new File(request.getSession().getServletContext().getRealPath("/img/"),"img_"+imgnum+".jpg");
}
//缓冲区
byte buffer[]=new byte[1024];
FileOutputStream fos=new FileOutputStream(file);
int len=sis.read(buffer, 0, 1024);
//把流里的信息循环读入到文件中
while( len!=-1 )
{
fos.write(buffer, 0, len);
len=sis.readLine(buffer, 0, 1024);
}
fos.close();
sis.close();
}

android客户端代码：
public static void uploadFile(String imageFilePath)
{
String actionUrl = "http://192.168.1.32:8080/UploadServer/ImageServlet";
try
{
URL url =new URL(actionUrl);
HttpURLConnection con=(HttpURLConnection)url.openConnection();

con.setDoInput(true);
con.setDoOutput(true);
con.setUseCaches(false);

con.setRequestMethod("POST");

DataOutputStream ds = new DataOutputStream(con.getOutputStream());
File file = new File(imageFilePath);

FileInputStream fStream = new FileInputStream(file);
int bufferSize = 1024;
byte[] buffer = new byte[bufferSize];

int length = -1;

while((length = fStream.read(buffer)) != -1)
{

ds.write(buffer, 0, length);
}

fStream.close();
ds.flush();

InputStream is = con.getInputStream();
int ch;
StringBuffer b =new StringBuffer();
while( ( ch = is.read() ) != -1 )
{
b.append( (char)ch );
}

ds.close();
}
catch(Exception e)
{
e.printStackTrace();
}

}

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