java代码内发送网络请求

具体代码如下：

 public void test1() {
     
        //发送post请求
        PrintWriter out = null;
        BufferedReader in = null;
        String result = "";
        try {
     
            URL realUrl = new URL("http:.......");
            // 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);
            // 获取URLConnection对象对应的输出流
            out = new PrintWriter(conn.getOutputStream());
            // 发送请求参数
            //参数格式如下
            out.print("username=???&password=???");
            // 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(), "UTF-8"));
            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();
            }
        }
        Object parse = JSON.parse(result);
        System.out.println(result);
        System.out.println(parse.toString());
    }