Http Post请求

一般的POST请求

/**

     * 向指定 URL 发送POST方法的请求

     * 

     * @param url

     *            发送请求的 URL

     * @param param

     *            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。

     * @return 所代表远程资源的响应结果

     */

    public static String sendPost(String url, String param) {

        PrintWriter out = null;

        BufferedReader in = null;

        String result = "";

        try {

            URL realUrl = new URL(url);

            // 打开和URL之间的连接

            URLConnection conn = realUrl.openConnection();

            // 设置通用的请求属性

            conn.setRequestProperty("accept", "*/*");

            conn.setRequestProperty("connection", "Keep-Alive");

            conn.setRequestProperty("user-agent","Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");

            // 发送POST请求必须设置如下两行

            conn.setDoOutput(true);

            conn.setDoInput(true);

            conn.setConnectTimeout(200);

            // 获取URLConnection对象对应的输出流

            out = new PrintWriter(conn.getOutputStream());

            // 发送请求参数

            out.print(param);

            // flush输出流的缓冲

            out.flush();

            // 定义BufferedReader输入流来读取URL的响应

            in = new BufferedReader(

                    new InputStreamReader(conn.getInputStream()));

            String line;

            while ((line = in.readLine()) != null) {

                result += line;

            }

        } catch (Exception e) {

            System.out.println("发送 POST 请求出现异常！"+e);

            e.printStackTrace();

        }

        //使用finally块来关闭输出流、输入流

        finally{

            try{

                if(out!=null){

                    out.close();

                }

                if(in!=null){

                    in.close();

                }

            }

            catch(IOException ex){

                ex.printStackTrace();

            }

        }

        return result;

    }    

流的POST请求

// 功能: postBody形式发送数据

    // @param urlPath 对方地址

    // @param json 要传送的数据

    // @return

    // @throws Exception

    public static String postBody(String urlPath, String json) throws Exception {

        try {

            // Configure and open a connection to the site you will send the

            // request

            URL url = new URL(urlPath);

            HttpURLConnection urlConnection = (HttpURLConnection) url

                    .openConnection();

            // 设置doOutput属性为true表示将使用此urlConnection写入数据

            urlConnection.setDoOutput(true);

            // 定义待写入数据的内容类型，我们设置为application/x-www-form-urlencoded类型

            urlConnection.setRequestProperty("content-type",

                    "application/x-www-form-urlencoded");

            // 得到请求的输出流对象

//            OutputStreamWriter out = new OutputStreamWriter(

//                    urlConnection.getOutputStream());

            OutputStreamWriter out = new OutputStreamWriter(

                    urlConnection.getOutputStream(),"UTF-8");

            // 把数据写入请求的Body

            out.write(json);

            out.flush();

            out.close();

            // 从服务器读取响应

            InputStream inputStream = urlConnection.getInputStream();

            String encoding = urlConnection.getContentEncoding();

            String body = IOUtils.toString(inputStream, encoding);

            inputStream.close();

            return body;

        } catch (IOException e) {

            e.printStackTrace();

            throw e;

        }

    }