java https 工具类_java https 请求工具类-通用

以下是一个通用的Java HTTP请求工具类，可以用于发送HTTPS请求：

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;

public class HttpUtils {
    /**
     * 发送HTTP GET请求
     * @param url 请求的URL地址
     * @return 响应结果
     */
    public static String sendHttpGet(String url) throws Exception {
        URL obj = new URL(url);
        HttpURLConnection con = (HttpURLConnection) obj.openConnection();
        con.setRequestMethod("GET");

        int responseCode = con.getResponseCode();
        if (responseCode == HttpURLConnection.HTTP_OK) { // 成功
            BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
            String inputLine;
            StringBuffer response = new StringBuffer();

            while ((inputLine = in.readLine()) != null) {
                response.append(inputLine);
            }
            in.close();
            return response.toString();
        } else {
            throw new Exception("HTTP请求失败，返回码：" + responseCode);
        }
    }

    /**
     * 发送HTTPS GET请求
     * @param url 请求的URL地址
     * @return 响应结果
     */
    public static String sendHttpsGet(String url) throws Exception {
        SSLContext sslcontext = SSLContext.getInstance("TLS");
        sslcontext.init(null, new TrustManager[] {new X509TrustManager() {
            public void checkClientTrusted(java.security.cert.X509Certificate[] arg0, String arg1) {}
            public void checkServerTrusted(java.security.cert.X509Certificate[] arg0, String arg1) {}
            public java.security.cert.X509Certificate[] getAcceptedIssuers() {return new java.security.cert.X509Certificate[0];}
        }}, new java.security.SecureRandom());

        URL obj = new URL(url);
        HttpsURLConnection con = (HttpsURLConnection) obj.openConnection();
        con.setSSLSocketFactory(sslcontext.getSocketFactory());
        con.setRequestMethod("GET");

        int responseCode = con.getResponseCode();
        if (responseCode == HttpsURLConnection.HTTP_OK) { // 成功
            BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
            String inputLine;
            StringBuffer response = new StringBuffer();

            while ((inputLine = in.readLine()) != null) {
                response.append(inputLine);
            }
            in.close();
            return response.toString();
        } else {
            throw new Exception("HTTPS请求失败，返回码：" + responseCode);
        }
    }
}

这个工具类使用了Java标准库中的`HttpURLConnection`和`HttpsURLConnection`来发送HTTP/HTTPS请求，并且支持GET请求方式。在发送HTTPS请求时，需要先自定义一个`TrustManager`，并且将其设为SSLContext的默认信任管理器，这样才能避免SSL证书验证失败的问题。