调用一个https的接口报错javax.net.ssl.SSLException: Received fatal alert: protocol_version
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
解决方法3：
在项目中同时配置jdk1.6和jdk1.8
我用的方法3，方法1和方法2没有起作用