HttpURLconnection使用POST方式提交JSON数据给服务器

最原始的味道，使用HttpURLconnection提交JSON数据给后台服务器。此处留下标记。

• 将javabean对象转换成Json字符串。
• 通过HttpUrlconnection提交数据。
• getRequestCode返回415

1.javabean转换成JSON字符串工具类。这里使用Gson解析器，请各位自行添加依赖包。

//将JSON字符串转换成javabean
public static <T> T parsr(String json ,Class<T> tClass){
        //判读字符串是否为空
        if(TextUtils.isEmpty(json)){
            return null;
        }

        if(gson==null){
            gson = new Gson();
        }
        return gson.fromJson(json,tClass);
    }
    //将javabean转换成JSON字符串
    public static String converJavaBeanToJson(Object obj){
        if(obj == null){
            return "";
        }
        if(gson == null){
            gson = new Gson();
        }
        String beanstr = gson.toJson(obj);
        if(!TextUtils.isEmpty(beanstr)){
            return beanstr;
        }
        return "";
    }
           

1. HttpUrlconnection部分

//发送JSON字符串 如果成功则返回成功标识。
    public static String doJsonPost(String urlPath, String Json) {
        // HttpClient 6.0被抛弃了
        String result = "";
        BufferedReader reader = null;
        try {
            URL url = new URL(urlPath);
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod("POST");
            conn.setDoOutput(true);
            conn.setDoInput(true);
            conn.setUseCaches(false);
            conn.setRequestProperty("Connection", "Keep-Alive");
            conn.setRequestProperty("Charset", "UTF-8");
            // 设置文件类型:
            conn.setRequestProperty("Content-Type","application/json; charset=UTF-8");
            // 设置接收类型否则返回415错误
            //conn.setRequestProperty("accept","*/*")此处为暴力方法设置接受所有类型，以此来防范返回415;
          conn.setRequestProperty("accept","application/json");
            // 往服务器里面发送数据
            if (Json != null && !TextUtils.isEmpty(Json)) {
                byte[] writebytes = Json.getBytes();
                // 设置文件长度
                conn.setRequestProperty("Content-Length", String.valueOf(writebytes.length));
                OutputStream outwritestream = conn.getOutputStream();
                outwritestream.write(Json.getBytes());
                outwritestream.flush();
                outwritestream.close();
                Log.d("hlhupload", "doJsonPost: conn"+conn.getResponseCode());
            }
            if (conn.getResponseCode() == ) {
                reader = new BufferedReader(
                        new InputStreamReader(conn.getInputStream()));
                result = reader.readLine();
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (reader != null) {
                try {
                    reader.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return result;
    }
           

亲测可行，亲们可以多试试。