HttpUrlConnection 网络连接

最新推荐文章于 2024-07-03 09:22:21 发布

原创最新推荐文章于 2024-07-03 09:22:21 发布 · 399 阅读

CC 4.0 BY-SA版权

本文介绍了一种利用Java中的HttpURLConnection类从指定URL获取JSON数据的方法。通过创建URL对象并打开连接，设置请求方式为GET，设定读取超时时间，检查响应状态码是否为200来判断请求是否成功。若成功则读取输入流，逐行读取并拼接成完整的JSON字符串返回。

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导包
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

public class HttpUrlConnection {
    public static String getJson(String urldata) {
        try {
            URL url = new URL(urldata);
            HttpURLConnection httpurlConnection = (HttpURLConnection) url.openConnection();
            httpurlConnection.setRequestMethod("GET");
            httpurlConnection.setReadTimeout(8000);
            int responseCode = httpurlConnection.getResponseCode();
            if (responseCode == 200) {
                InputStream inputStream = httpurlConnection.getInputStream();
                StringBuilder stringBuilder = new StringBuilder();
                BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
                String json = "";
                while ((json = bufferedReader.readLine()) != null) {
                    stringBuilder.append(json);
                }
                return stringBuilder.toString();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return "";
    }
}