JAVA POST 上传文件

    public String upload(String url, ArrayList<File> files) {
        String BOUNDARY = "------WebKitFormBoundary"; //数据分隔线 
        String endline = "--" + BOUNDARY + "--\r\n";//数据结束标志 
        StringBuilder sb = new StringBuilder();
        HttpURLConnection http = null;
        BufferedReader in = null;
        DataOutputStream out = null;
        try {
            URL u = new URL(url);
            http = (HttpURLConnection) u.openConnection();
            http.setRequestMethod("POST");
            http.setDoOutput(true);
            http.setRequestProperty("Charset", charset);
            http.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.11 (KHTML, like Gecko) Chrome/23.0.1271.64 Safari/537.11");
            http.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + BOUNDARY);
            http.setConnectTimeout(ConnectTimeout);
            http.setReadTimeout(ReadTimeout);
            http.connect();

            out = new DataOutputStream(http.getOutputStream());

            for (File file : files) {
                String fileBody = endline + "Content-Disposition: form-data;name=\"Filedata\";filename=\"" + file.getName() + "\"\r\n";
                fileBody += "Content-Type: image/jpeg\r\n\r\n";
                System.out.println(fileBody);
                out.write(fileBody.getBytes());
                FileInputStream fis = new FileInputStream(file);
                byte[] buffer = new byte[1024];
                int len;
                while ((len = fis.read(buffer, 0, 1024)) != -1) {
                    out.write(buffer, 0, len);
                }
                out.write("\r\n".getBytes());
            }

            String postBody = endline + "Content-Disposition: form-data;name=\"test\"\r\n\r\n11\r\n";
            System.out.println(postBody);
            out.write(postBody.getBytes());
            
            out.write(endline.getBytes());
            out.flush();
            out.close();

            in = new BufferedReader(new InputStreamReader(http.getInputStream(), charset));
            String tmp;
            while ((tmp = in.readLine()) != null) {
                sb.append(tmp).append("\n");
            }

            in.close();
        } catch (Exception ex) {
            Logger.getLogger(Http.class.getName()).log(Level.SEVERE, null, ex);
        } finally {
            close(http, in, out);
            return sb.toString();
        }
    }

PHP 页面
print_r($_FILES);
print_r($_POST);

upload 返回的结果是空 array

不要让我去用httpclient

大神们，我这代码问题出在哪

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没法直接传文件流吧，需要转换成Base64吧