httpURLConnection

最新推荐文章于 2025-06-07 09:42:46 发布

lxrlxr888

最新推荐文章于 2025-06-07 09:42:46 发布

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本文链接：https://blog.youkuaiyun.com/lxrlxr888/article/details/78171585

本文通过示例代码展示了如何使用Java发起HTTP GET和POST请求，并从服务器接收JSON响应。包括设置请求头、处理响应状态码及读取响应内容等关键步骤。

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1.doget

String path = "http://v.juhe.cn/toutiao/index?type=top&key=597b4f9dcb50e051fd725a9ec54d6653";
        URL url = null;
        try {
            url = new URL(path);
           HttpURLConnection connection = (HttpURLConnection) url.openConnection();

        connection.setRequestMethod("GET");
         connection.setReadTimeout(5000);
          connection.setConnectTimeout(5000);

         int responseCode = connection.getResponseCode();
        if (responseCode ==200){
            InputStream inputStream = connection.getInputStream();

            String json = streamToString(inputStream,"utf-8");

            //json字符串已经获取到,,,也就是异步任务执行的结果获取到了return json;
        }

2.dopost

String path = "http://v.juhe.cn/toutiao/index";
URL url = new URL(path);

                        //打开连接
                        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
                        //设置
                        connection.setRequestMethod("POST");
                        connection.setReadTimeout(5000);
                        connection.setConnectTimeout(5000);

//设置请求内容的类型
connection.setRequestProperty("Content-Type","application/x-www-form-urlencoded");

//设置可以向外输出...因为post方式的时候参数是以流的形式写给服务器,所以设置向外输出
connection.setDoOutput(true);

                        //参数
                        String params = "type=top&key=597b4f9dcb50e051fd725a9ec54d6653";
                        //把参数以流的形式写给服务器
                        connection.getOutputStream().write(params.getBytes());//代码到这个位置,,,参数写给服务器

                        //获取
                        int responseCode = connection.getResponseCode();
                        if (responseCode == 200){
                            //获取到服务器返回的输入字节流....装的是json格式的数据
                            InputStream inputStream = connection.getInputStream();

//把字节流转成字符串
String json = streamToString(inputStream,"utf-8");

//解析获取到的json格式的字符串
Gson gson = new Gson();

//生成变量...alt+enter.....此时所有的数据都装到bean里面了
DataDataBean dataDataBean = gson.fromJson(json, DataDataBean.class);

}