Volley实现（multipart/form-data）Post请求

private void doInit(final Map<String, String> params, final File uploadFile) {
    String initUrl = "http://192.168.1.1:8080/cld/init";
    final String boundary = "-----------------" + UUID.randomUUID().toString();
    JsonObjectRequest request = new JsonObjectRequest(Request.Method.POST, initUrl, null,
        new Response.Listener<JSONObject>() {
            @Override
            public void onResponse(JSONObject jsonObject) {
                //TO-DO
            }
        }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError volleyError) {
                //TO-DO
            }
        }) {
        @Override
        public String getBodyContentType() {
            return "multipart/form-data; boundary=" + boundary;
        }
        @Override
        public byte[] getBody() {
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            List<BasicNameValuePair> pairs = new ArrayList<BasicNameValuePair>();
            if(params != null){
                Set<String> keys = params.keySet();
                for(Iterator<String> i = keys.iterator(); i.hasNext();) {
                    String key = (String)i.next();
                    pairs.add(new BasicNameValuePair(key, params.get(key)));
                }
            }
            int size = pairs.size();
            StringBuffer sb= new StringBuffer() ;
            for(int i=0; i<size; i++) {
                sb.append(TWO_HYPHENS).append(boundary).append(LINE_END);
                sb.append("Content-Disposition: form-data; name="").append(pairs.get(i).getName()).append(""").append(LINE_END);
                sb.append(LINE_END) ;
                sb.append(pairs.get(i).getValue()).append(LINE_END) ;
            }
            sb.append(TWO_HYPHENS).append(boundary).append(TWO_HYPHENS).append(LINE_END);
            try {
                bos.write(sb.toString().getBytes("utf-8"));
            } catch (IOException e) {
                e.printStackTrace();
            }
            return bos.toByteArray();
        }
    };
    mQueue.add(request);
}