android上传文件到服务器的一个方法

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public String fileUpload(String url, Map<String, String> params,            Map<String, File> files // <参数名，文件>形式    ) throws IOException {        String BOUNDARY = java.util.UUID.randomUUID().toString();        String PREFIX = "--", LINEND = "\r\n";        String MULTIPART_FROM_DATA = "multipart/form-data";        String CHARSET = "UTF-8";        URL uri = new URL(url);        HttpURLConnection conn = (HttpURLConnection) uri.openConnection();        conn.setReadTimeout(10 * 1000);        conn.setDoInput(true);// 允许输入        conn.setDoOutput(true);// 允许输出        conn.setUseCaches(false);        conn.setRequestMethod("POST"); // Post方式        conn.setRequestProperty("connection", "keep-alive");        conn.setRequestProperty("Charsert", "UTF-8");        conn.setRequestProperty("Content-Type", MULTIPART_FROM_DATA                + ";boundary=" + BOUNDARY);        // 首先组拼文本类型的参数        StringBuilder sb = new StringBuilder();        if (params != null) {            for (Map.Entry<String, String> entry : params.entrySet()) {                sb.append(PREFIX);                sb.append(BOUNDARY);                sb.append(LINEND);                sb.append("Content-Disposition: form-data; name=\""                        + entry.getKey() + "\"" + LINEND);                sb.append("Content-Type: text/plain; charset=" + CHARSET                        + LINEND);                sb.append("Content-Transfer-Encoding: 8bit" + LINEND);                sb.append(LINEND);                sb.append(entry.getValue());                sb.append(LINEND);            }        }        DataOutputStream outStream = new DataOutputStream(                conn.getOutputStream());        outStream.write(sb.toString().getBytes());        // 发送文件数据        if (files != null)            for (Map.Entry<String, File> file : files.entrySet()) {                String paramName = file.getKey();                File f = file.getValue();                StringBuilder sb1 = new StringBuilder();                sb1.append(PREFIX);                sb1.append(BOUNDARY);                sb1.append(LINEND);                sb1.append("Content-Disposition: form-data; name=\""                        + paramName + "\"; filename=\"" + f.getName() + "\""                        + LINEND);                sb1.append("Content-Type: application/octet-stream; charset="                        + CHARSET + LINEND);                sb1.append(LINEND);                outStream.write(sb1.toString().getBytes());                InputStream is = new FileInputStream(f);                byte[] buffer = new byte[4 * 1024];                int len = 0;                while ((len = is.read(buffer)) != -1) {                    outStream.write(buffer, 0, len);                }                is.close();                outStream.write(LINEND.getBytes());            }        // 请求结束标志        byte[] end_data = (PREFIX + BOUNDARY + PREFIX + LINEND).getBytes();        outStream.write(end_data);        outStream.flush();        // 得到响应码        int res = conn.getResponseCode();        InputStream in = conn.getInputStream();        InputStreamReader isReader = new InputStreamReader(in);        BufferedReader bufReader = new BufferedReader(isReader);        String line = null;        StringBuffer sb2 = new StringBuffer();        if (res == 200) {            while ((line = bufReader.readLine()) != null) {                sb2.append(line);            }        }        outStream.close();        in.close();        conn.disconnect();        return sb2.toString();    }
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