Java发送http请求（httpUrlConnection）安

一、文章前言

一念之间的坚持换来更好的自己

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二、内容：

有时候我们需要用java代码模仿浏览器给某个服务器发送http请求(本文将以get和post请求来展示)。

1、首先我们先来看看get请求(文章所请求得服务器就以百度搜索为例)：

1.我们打开百度主页按下F12或者右键查看网页源码NetWork
2.可以简单的发现请求url是"https://www.baidu.com/s?wd=(这里是你想查询的东西也就是get请求的参数)"
下面放上代码

private static StringBuilder buildConnection() throws IOException {
        //String path = "https://www.baidu.com/s?wd=(...)"；根据实际情况来
        String path = "https://www.reg007.com/search?q=xxxx@qq.com";
        URL url;
        HttpURLConnection connection;
        url = new URL(path);
        connection = (HttpURLConnection) url.openConnection();
        //设置请求的方式
        connection.setRequestMethod("GET");
        connection.connect();
        //获取请求返回的输入流
        InputStream inputStream = connection.getInputStream();
        InputStreamReader reader = new InputStreamReader(inputStream);
        BufferedReader bufferedReader = new BufferedReader(reader);
        StringBuilder result = new StringBuilder();
        String line;
        while ((line = bufferedReader.readLine()) != null) {
            result.append(line);
        }
        connection.disconnect();
        bufferedReader.close();
        inputStream.close();
        reader.close();
        return result;
    }

方法运行结果：

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获取到了网页的源码（可以给利用jsoup当成爬虫使用）

**2、下面是post请求

代码如下：

private static StringBuilder buildConnection() throws IOException {
        //String path = "https://www.baidu.com/s?wd=(...)"；根据实际情况来
        String path = "";
        URL url;
        HttpURLConnection connection;
        url = new URL(path);
        connection = (HttpURLConnection) url.openConnection();
        //设置请求的方式
        connection.setRequestMethod("POST");
        //post请求必须设置下面两行
        connection.setDoInput(true);
        connection.setDoOutput(true);

        /**
         * JSON数据的请求
         * outputStream.write(stringJson.getBytes(), 0, stringJson.getBytes().length);
         * outputStream.close();
         * **/


        OutputStream outputStream = connection.getOutputStream();
        DataOutputStream dataOutputStream = new DataOutputStream(outputStream);
        String username= "";
        String password = "";
        String content = "username=" + username + "&password=" + password;
         dataOutputStream.writeBytes(content);
         dataOutputStream.flush();
         dataOutputStream.close();




        connection.connect();
        //获取请求返回的输入流
        InputStream inputStream = connection.getInputStream();
        InputStreamReader reader = new InputStreamReader(inputStream);
        BufferedReader bufferedReader = new BufferedReader(reader);
        StringBuilder result = new StringBuilder();
        String line;
        while ((line = bufferedReader.readLine()) != null) {
            result.append(line);
        }
       connection.disconnect();
        bufferedReader.close();
        inputStream.close();
        reader.close();
        return result;
    }

以上代码就不给测试了因为post请求测起来就需要一些个人的信息了，为了防止信息泄露。
如果读者有什么问题请在评论区留言。
（如果有不正确的地方请指正）