java模拟浏览器上传文件

public static void main(String[] args) {
String str = uploadFile("C:/Users/RGKY/Desktop/wKgBHVbLtuWAVNZAAABB_J2qzhc553.jpg", "http://localhost:8087/worldapp/fastfds/uploadSingleFile.cf?fieldName=selectFile", "wKgBHVbLtuWAVNZAAABB_J2qzhc553.jpg");
System.out.println(str);
}

/**
*
* @param file
*            待上传的文件路径
* @param uploadUrl
*            上传服务接口路径
* @param fileName
*            文件名称，服务器获取的文件名称
* @return
*/
public static String uploadFile(/* Bitmap src */String file, String uploadUrl, String fileName) {
String end = "\r\n";
String twoHyphens = "--";
String boundary = "******";
try {
URL url = new URL(uploadUrl);
HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
// 设置每次传输的流大小，可以有效防止手机因为内存不足崩溃
// 此方法用于在预先不知道内容长度时启用没有进行内部缓冲的 HTTP 请求正文的流。
httpURLConnection.setChunkedStreamingMode(128 * 1024);// 128K
// 允许输入输出流
httpURLConnection.setDoInput(true);
httpURLConnection.setDoOutput(true);
httpURLConnection.setUseCaches(false);
// 使用POST方法
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);
// name相当于html标签file的name属性，fileName相当于标签value值
dos.writeBytes("Content-Disposition: form-data;name=\"selectFile\";fileName=\"" + fileName + "\"" + end);
dos.writeBytes(end);

// 将要上传的内容写入流中
// InputStream srcis = Function.Bitmap2IS(src);
InputStream srcis = new FileInputStream(file);
byte[] buffer = new byte[8192]; // 8k
int count = 0;
// 读取文件
while ((count = srcis.read(buffer)) != -1) {
dos.write(buffer, 0, count);
}
srcis.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);
// 上传返回值
String sl;
String result = "";
while ((sl = br.readLine()) != null)
result = result + sl;
br.close();
is.close();
return result;
} catch (Exception e) {
e.printStackTrace();
return "网络出错!";
}
}