HttpURLconnection使用POST方式提交JSON数据给服务器

文章出处

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。

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

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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javabeanpublic 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 "";    }
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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() == 200) {                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;    }