POST请求网络数据

//post请求数据
    public static String httpPost(String str1, String str2) {

        try {
            //设置url
            URL url = new URL(str1);
            //获取HttpURLConnextion
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            //提交模式
            connection.setRequestMethod("POST");
            //连接超时单位毫秒
            connection.setConnectTimeout(5000);
            //读取超时单位毫秒
            connection.setReadTimeout(5000);
            //发送Post请求必须设置如下两行
            connection.setDoOutput(true);
            connection.setDoInput(true);
            //获取URLConnection对象对应的输出流
            PrintWriter writer = new PrintWriter(connection.getOutputStream());
            //发送请求
            writer.write(str2);
            //关闭流
            writer.flush();
            //刷新
            //获取请求码
            int code = connection.getResponseCode();
            //判断是否成功
            if (code == 200) {
                //读取数据
                InputStream stream = connection.getInputStream();
                BufferedReader reader = new BufferedReader(new InputStreamReader(stream, "utf-8"));
                //拼接数符串
                StringBuilder builder = new StringBuilder();
                String s = "";
                //读取数据
                while ((s = reader.readLine()) != null) {
                    //拼接字符串
                    builder.append(s);
                }

                return builder.toString();
            }
            //关闭连接
            connection.disconnect();
        } catch (Exception e) {
            e.printStackTrace();
        }

        return null;
    }