HttpURLConnection post set params 设置请求参数的三种方法

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      /**             * set  params one way   OutputStream             */           byte[] bytesParams = paramsStr.getBytes();            // 发送请求params参数            connection.getOutputStream().write(bytesParams);            /**             * set  params two way  PrintWriter             */           PrintWriter printWriter = new PrintWriter(connection.getOutputStream());            //PrintWriter printWriter = new PrintWriter(new OutputStreamWriter(connection.getOutputStream(),"UTF-8"));            // 发送请求params参数            printWriter.write(paramsStr);            printWriter.flush();            /**             * set  params three way  OutputStreamWriter             */            OutputStreamWriter out = new OutputStreamWriter(                    connection.getOutputStream(), "UTF-8");            // 发送请求params参数            out.write(paramsStr);            out.flush();

demo：

 /**     * @param pathurl     * @param paramsStr     * @return     */    private static String postUrlBackStr(String pathurl, String paramsStr) {        String backStr = "";        InputStream inputStream = null;        ByteArrayOutputStream baos = null;        try {            URL url = new URL(pathurl);            HttpURLConnection connection = (HttpURLConnection) url.openConnection();            // 设定请求的方法为"POST"，默认是GET            connection.setRequestMethod("POST");            connection.setConnectTimeout(50000);            connection.setReadTimeout(50000);            // User-Agent  IE9的标识            connection.setRequestProperty("User-Agent", "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0;");            connection.setRequestProperty("Accept-Language", "zh-CN");            connection.setRequestProperty("Connection", "Keep-Alive");            connection.setRequestProperty("Charset", "UTF-8");            /**             * 当我们要获取我们请求的http地址访问的数据时就是使用connection.getInputStream().read()方式时我们就需要setDoInput(true)，             根据api文档我们可知doInput默认就是为true。我们可以不用手动设置了，如果不需要读取输入流的话那就setDoInput(false)。             当我们要采用非get请求给一个http网络地址传参 就是使用connection.getOutputStream().write() 方法时我们就需要setDoOutput(true), 默认是false             */            // 设置是否从httpUrlConnection读入，默认情况下是true;            connection.setDoInput(true);            // 设置是否向httpUrlConnection输出，如果是post请求，参数要放在http正文内，因此需要设为true, 默认是false;            connection.setDoOutput(true);            connection.setUseCaches(false);            /**             * set  params one way   OutputStream             */         /*   byte[] bytesParams = paramsStr.getBytes();            // 发送请求params参数            connection.getOutputStream().write(bytesParams);*/            /**             * set  params two way  PrintWriter             */           /* PrintWriter printWriter = new PrintWriter(connection.getOutputStream());            //PrintWriter printWriter = new PrintWriter(new OutputStreamWriter(connection.getOutputStream(),"UTF-8"));            // 发送请求params参数            printWriter.write(paramsStr);            printWriter.flush();*/            /**             * set  params three way  OutputStreamWriter             */            OutputStreamWriter out = new OutputStreamWriter(                    connection.getOutputStream(), "UTF-8");            // 发送请求params参数            out.write(paramsStr);            out.flush();            connection.connect();//            int contentLength = connection.getContentLength();            if (connection.getResponseCode() == 200) {                inputStream = connection.getInputStream();//会隐式调用connect()                baos = new ByteArrayOutputStream();                int readLen;                byte[] bytes = new byte[1024];                while ((readLen = inputStream.read(bytes)) != -1) {                    baos.write(bytes, 0, readLen);                }                backStr = baos.toString();                Log.i(TAG, "backStr:" + backStr);            } else {                Log.e(TAG, "请求失败 code:" + connection.getResponseCode());            }        } catch (MalformedURLException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        } finally {            try {                if (baos != null) {                    baos.close();                }                if (inputStream != null) {                    inputStream.close();                }            } catch (IOException e) {                e.printStackTrace();            }        }        return backStr;    }

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