android端代码展示：
/* 上传文件至Server的方法 */
private void uploadFile() {
System.out.print("正在发送请求！");
String end = "\r\n";
String twoHyphens = "--";
String boundary = "*****";
try {
String urlpost=actionUrl;
URL url = new URL(urlpost);
HttpURLConnection con = (HttpURLConnection) url.openConnection();
/* 允许Input、Output，不使用Cache */
con.setDoInput(true);
con.setDoOutput(true);
con.setUseCaches(false);
/* 设置传送的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);
/* 设置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);
/* 设置每次写入1024bytes */
System.out.print("已经找到数据正在发送！");
int bufferSize = 1024*10;
byte[] buffer = new byte[bufferSize];
int length = -1;
/* 从文件读取数据至缓冲区 */
while ((length = fStream.read(buffer)) != -1) {
/* 将资料写入DataOutputStream中 */
ds.write(buffer, 0, length);
}
ds.writeBytes(end);
ds.writeBytes(twoHyphens + boundary + twoHyphens + end);
/* close streams */
fStream.close();
ds.flush();
/* 取得Response内容 */
InputStream is = con.getInputStream();
int ch;
StringBuffer b = new StringBuffer();
while ((ch = is.read()) != -1) {
b.append((char) ch);
}
/* 将Response显示于Dialog */
/* 关闭DataOutputStream */
ds.close();
try {
InfoUrl=InfoUrl+"?username="+username.getText()+"&password="+password.getText()+"&img="+b.toString();
Log.i("login", "uploadFile: "+InfoUrl);
HttpURLConnection huc= (HttpURLConnection) new URL(InfoUrl).openConnection();
huc.setDoInput(true);
huc.setDoOutput(true);
huc.setUseCaches(false);
/* 设置传送的method=POST */
huc.setRequestMethod("GET");
huc.connect();
InputStream is1 = huc.getInputStream();
int ch1;
StringBuffer b1 = new StringBuffer();
while ((ch1 = is1.read()) != -1) {
b1.append((char) ch1);
}
int result=Integer.parseInt(b1.toString());
if(result>0) {
showDialog("注册成功,请登录！");
Intent intent = new Intent(this, MainActivity.class);
startActivity(intent);
}else {
showDialog("注册失败,请检查！");
}
} catch (Exception e) {
e.printStackTrace();
}
} catch (Exception e) {
System.out.print("网络出现异常！");
showDialog("上传失败");
e.printStackTrace();
}
}服务器端：
PrintWriter out = response.getWriter();
FileUploadTool fut=new FileUploadTool(request,"photo");
String name=fut.getParameter("file1");
out.print(name);