HTTP POST 请求

HTTP POST 请求

public class HttpPostRequest {

    /**
     * 向指定 URL 发送 POST 方法的请求
     * 
     * @return 返回响应结果
     */
    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 connection = realUrl.openConnection();
            // 设置请求属性
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.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
            connection.setDoOutput(true);
            connection.setDoInput(true);
            // 获取URLConnection对象对应的输出流
            out = new PrintWriter(connection.getOutputStream());
            // 发送请求参数
            out.print(param);
            // flush输出流的缓冲
            out.flush();
            // 定义 BufferedReader 输入流读取URL的响应
            in = new BufferedReader(new InputStreamReader(connection.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;
    }

    public static void main(String[] args) {

        String postRequset = HttpPostRequest.sendPost("https://github.com/", null);
        System.out.println(postRequset);
    }

}

GET 请求：http://blog.youkuaiyun.com/ys0813/article/details/70336304