服务器端和客户端的上传代码

客户端：（android）

private void uploadFile()
{

String uploadUrl = "http://IP:8081/dbcampus/UploadFileServlet";
String end = "\r\n";
String twoHyphens = "--";
String boundary = "******";
try
{
URL url = new URL(uploadUrl);
HttpURLConnection httpURLConnection = (HttpURLConnection) url
.openConnection();
httpURLConnection.setDoInput(true);
httpURLConnection.setDoOutput(true);
httpURLConnection.setUseCaches(false);
httpURLConnection.setRequestMethod("POST");
httpURLConnection.setRequestProperty("Connection", "Keep-Alive");
httpURLConnection.setRequestProperty("Charset", "UTF-8");
httpURLConnection.setRequestProperty("Content-Type",
"multipart/form-data;boundary=" + boundary);

DataOutputStream dos = new DataOutputStream(httpURLConnection
.getOutputStream());
dos.writeBytes(twoHyphens + boundary + end);
dos
.writeBytes("Content-Disposition: form-data; name=\"file\"; filename=\""
+ srcPath.substring(srcPath.lastIndexOf("/") + 1)
+ "\"" + end);
dos.writeBytes(end);

FileInputStream fis = new FileInputStream(srcPath);
byte[] buffer = new byte[8192]; // 8k
int count = 0;
while ((count = fis.read(buffer)) != -1)
{
dos.write(buffer, 0, count);

}
fis.close();

dos.writeBytes(end);
dos.writeBytes(twoHyphens + boundary + twoHyphens + end);
dos.flush();

InputStream is = httpURLConnection.getInputStream();
InputStreamReader isr = new InputStreamReader(is, "utf-8");
BufferedReader br = new BufferedReader(isr);
String result = br.readLine();

Toast.makeText(this, result, Toast.LENGTH_LONG).show();
dos.close();
is.close();

} catch (Exception e)
{
e.printStackTrace();
setTitle(e.getMessage());
}

}

服务器端：

public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
try
{
request.setCharacterEncoding("UTF-8"); // 设置处理请求参数的编码格式
response.setContentType("text/html;charset=UTF-8"); // 设置Content-Type字段值
PrintWriter out = response.getWriter();

// 下面的代码开始使用Commons-UploadFile组件处理上传的文件数据
FileItemFactory factory = new DiskFileItemFactory(); // 建立FileItemFactory对象
ServletFileUpload upload = new ServletFileUpload(factory);
// 分析请求，并得到上传文件的FileItem对象
List<FileItem> items = upload.parseRequest(request);
// 从web.xml文件中的参数中得到上传文件的路径
String uploadPath = request.getSession().getServletContext().getRealPath("/");
System.out.println("uploadPath"+uploadPath);
File file = new File(uploadPath+"img");
if (!file.exists())
{
file.mkdir();
}
String filename = ""; // 上传文件保存到服务器的文件名
InputStream is = null; // 当前上传文件的InputStream对象
int lengthe=0;
// 循环处理上传文件
for (FileItem item : items)
{
// 处理普通的表单域
if (item.isFormField())
{
if (item.getFieldName().equals("filename"))
{
// 如果新文件不为空，将其保存在filename中
if (!item.getString().equals(""))
filename = item.getString("UTF-8");
System.out.println("filename1"+filename);
}
}
// 处理上传文件
else if (item.getName() != null && !item.getName().equals(""))
{
// 从客户端发送过来的上传文件路径中截取文件名
filename = item.getName().substring(
item.getName().lastIndexOf("\\") + 1);
System.out.println("filename2"+filename);

is = item.getInputStream(); // 得到上传文件的InputStream对象
lengthe=is.available();//获得要上传文件的所附带流的大小
System.out.println("lengthe:"+lengthe);

}
}
// 将路径和上传文件名组合成完整的服务端路径
Stringfilename1 = uploadPath +"img"+ filename;
// 如果服务器已经存在和上传文件同名的文件，则输出提示信息
if (new File(filename1).exists())
{
new File(filename1).delete();
}

// 开始上传文件(采用字节流上传)（代码是可用的）
if (!filename1.equals(""))
{
File file1=new File(uploadPath+"img",filename);

// 用FileOutputStream打开服务端的上传文件
FileOutputStream fos = new FileOutputStream(file1);
byte[] buffer = new byte[8192]; // 每次读8K字节
int count = 0;
// 开始读取上传文件的字节，并将其输出到服务端的上传文件输出流中
while ((count = is.read(buffer)) > 0)
{
fos.write(buffer, 0, count); // 向服务端文件写入字节流

}
fos.close(); // 关闭FileOutputStream对象
is.close(); // InputStream对象
out.println("文件上传成功!");

}

}
catch (Exception e)
{

}

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