javax.net.ssl.SSLException: Received fatal alert: protocol

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今天在开发过程中，调用一个https的接口引发错误

javax.net.ssl.SSLException: Received fatal alert: protocol_version解决

在Java 1.8上，默认TLS协议是v1.2。在Java 1.6和1.7上，默认是已废弃的TLS1.0，由于此项目使用的是jdk1.6，因此引发错误。

解决方法1：

在发起请求前面设置TLSv1.2协议

	System.setProperty("https.protocols", "TLSv1.2");

解决方法2：

在发起请求前忽略ssl认证：

工具类：


import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
 
import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSession;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;
 
public class SslUtils {
 
    private static void trustAllHttpsCertificates() throws Exception {
        TrustManager[] trustAllCerts = new TrustManager[1];
        TrustManager tm = new miTM();
        trustAllCerts[0] = tm;
        SSLContext sc = SSLContext.getInstance("SSL");
        sc.init(null, trustAllCerts, null);
        HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory());
    }
 
    static class miTM implements TrustManager,X509TrustManager {
        public X509Certificate[] getAcceptedIssuers() {
            return null;
        }
 
        public boolean isServerTrusted(X509Certificate[] certs) {
            return true;
        }
 
        public boolean isClientTrusted(X509Certificate[] certs) {
            return true;
        }
 
        public void checkServerTrusted(X509Certificate[] certs, String authType)
                throws CertificateException {
            return;
        }
 
        public void checkClientTrusted(X509Certificate[] certs, String authType)
                throws CertificateException {
            return;
        }
    }
     
    /**
     * 忽略HTTPS请求的SSL证书，必须在openConnection之前调用
     * @throws Exception
     */
    public static void ignoreSsl() throws Exception{
        HostnameVerifier hv = new HostnameVerifier() {
            public boolean verify(String urlHostName, SSLSession session) {
                return true;
            }
        };
        trustAllHttpsCertificates();
        HttpsURLConnection.setDefaultHostnameVerifier(hv);
    }
}

使用方法：

public String doHttpGetUTF8(String postUrl,String token) {
		OutputStreamWriter out = null;
        BufferedReader in = null;
        String result = "";
        try {
        	URL realUrl = new URL(postUrl);
        	if("https".equalsIgnoreCase(realUrl.getProtocol())){
        	   SslUtils.ignoreSsl();
        	}
        	//打开 url之间的连接
        	HttpURLConnection conn = (HttpURLConnection)realUrl.openConnection();
        	//设置通用的请求属性
        	conn.setRequestMethod("GET");
        	conn.setUseCaches(false);
        	conn.setRequestProperty("Accept-Charset", "utf-8");
        	conn.setRequestProperty("contentType", "utf-8");
        	conn.setRequestProperty("Content-Type", "application/x‑www‑form‑urlencoded");
        	conn.setRequestProperty("Authorization", "Bearer "+token);
        	conn.setConnectTimeout(5000);
        	conn.setReadTimeout(5000);
        	long start = System.currentTimeMillis();
        	//获取 URLConnection对象输出对应的输出流

        	// 定义BufferedReader输入流来读取URL的响应
        	in = new BufferedReader(new InputStreamReader(conn.getInputStream(),"utf-8"));
        	long end = System.currentTimeMillis();
        	
        	String line;
        	while (null != (line = in.readLine())) {
        		result += "\n" + line;
        	}
        	//建立
        } catch (Exception e) {
            System.out.println("发送GET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();
            }
        }
        return result;
    }

建立连接之前调用该方法即可

javax.net.ssl.SSLException: Received fatal alert: protocol_version解决