Android文件上传带参数

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//返回值HttpResult可替换成自己想要的类型.

public static <T> HttpResult<String> post(final String urlStr, final Map<String, String> params, T body) {    String BOUNDARY = UUID.randomUUID().toString();  //边界标识   随机生成    String PREFIX = "--", LINE_END = "\r\n";    HttpResult<String> result = new HttpResult<>();    File file = (File) body;    HttpURLConnection conn = null;    try {        URL url = new URL(urlStr);        conn = (HttpURLConnection) url.openConnection();        conn.setReadTimeout(30 * 1000);        conn.setConnectTimeout(30 * 1000);        conn.setDoInput(true);  //允许输入流        conn.setDoOutput(true); //允许输出流        conn.setUseCaches(false);  //不允许使用缓存        conn.setRequestMethod("POST");  //请求方式        conn.setRequestProperty("Charset", CHARSET);  //设置编码        conn.setRequestProperty("connection", "keep-alive");        conn.setRequestProperty("Content-Type", "multipart/form-data" + ";boundary=" + BOUNDARY);        headers.remove("token");        OutputStream out = conn.getOutputStream();        StringBuffer sb = new StringBuffer();        for (Map.Entry<String, String> entry : params.entrySet()) {            sb.append(PREFIX).append(BOUNDARY).append(LINE_END)                    .append("Content-Disposition: form-data; name=\"" + entry.getKey() + "\"" + LINE_END)                    .append("Content-Type: text/plain; charset=" + CHARSET + LINE_END)                    .append("Content-Transfer-Encoding: 8bit" + LINE_END)                    .append(LINE_END).append(entry.getValue()).append(LINE_END);        }        sb.append(PREFIX).append(BOUNDARY).append(LINE_END)                .append("Content-Disposition: form-data; name=\"file\"; filename=\"" + file.getName() + "\"" + LINE_END)                .append("Content-Type: application/octet-stream; charset=" + CHARSET + LINE_END)                .append(LINE_END);        out.write(sb.toString().getBytes(CHARSET));        InputStream is = new FileInputStream(file);        byte[] bytes = new byte[1024];        int len;        while ((len = is.read(bytes)) != -1) {            out.write(bytes, 0, len);        }        out.write(LINE_END.getBytes());        out.write((PREFIX + BOUNDARY + PREFIX + LINE_END).getBytes());        out.flush();        is.close();        out.close();        int resCode = result.code = conn.getResponseCode(); // 开始发送数据        if (resCode == RES_CODE_SUCCESS) {            result.obj = buildString(conn.getInputStream());        }    } catch (IOException e) {        e.printStackTrace();        result.e = e;    } finally {        if (conn != null) {            conn.disconnect();        }    }    return result;}

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