package com.jdbc;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Statement;

public class Jdbc_link {

//链接数据库

public static Connection getConnection() throws SQLException,ClassNotFoundException{

Class.forName("com.mysql.jdbc.Driver");

String url="jdbc:mysql://localhost:3306/eshopdata?characterEncoding=utf8&useSSL=true";

String username="root";

String password="zy113028";

Connection conn=DriverManager.getConnection(url, username, password);

return conn;

}

//关闭数据库链接,释放资源

public static void release(Statement stmt,Connection conn){

if(stmt !=null){

try{

stmt.close();

}catch(SQLException e){

e.printStackTrace();

}

}

if(conn!=null){

try{

conn.close();

}catch(SQLException e){

e.printStackTrace();

}

}

}

public static void release(ResultSet re,Statement stmt,Connection conn){

if(re!=null){

try{

re.close();

}catch(SQLException e){

e.printStackTrace();

}

}

release(stmt,conn);

}

}

会提示链接出现错误

下面是报错

Exception in thread "main" com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

The last packet successfully received from the server was 254 milliseconds ago. The last packet sent successfully to the server was 248 milliseconds ago.

at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)

at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)

at java.lang.reflect.Constructor.newInstance(Constructor.java:513)

at com.mysql.jdbc.Util.handleNewInstance(Util.java:425)

at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:989)

at com.mysql.jdbc.ExportControlled.transformSocketToSSLSocket(ExportControlled.java:203)

at com.mysql.jdbc.MysqlIO.negotiateSSLConnection(MysqlIO.java:4901)

at com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication(MysqlIO.java:1659)

at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1226)

at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2191)

at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2222)

at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2017)

at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:779)

at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)

at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)

at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)

at java.lang.reflect.Constructor.newInstance(Constructor.java:513)

at com.mysql.jdbc.Util.handleNewInstance(Util.java:425)

at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:389)

at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:330)

at java.sql.DriverManager.getConnection(DriverManager.java:582)

at java.sql.DriverManager.getConnection(DriverManager.java:185)

at com.jdbc.Jdbc_link.getConnection(Jdbc_link.java:18)

at com.jdbc.Jdbc_main.main(Jdbc_main.java:14)

Caused by: javax.net.ssl.SSLHandshakeException: java.security.cert.CertificateException: java.security.cert.CertPathValidatorException: Path does not chain with any of the trust anchors

at com.sun.net.ssl.internal.ssl.Alerts.getSSLException(Alerts.java:174)

at com.sun.net.ssl.internal.ssl.SSLSocketImpl.fatal(SSLSocketImpl.java:1611)

at com.sun.net.ssl.internal.ssl.Handshaker.fatalSE(Handshaker.java:187)

at com.sun.net.ssl.internal.ssl.Handshaker.fatalSE(Handshaker.java:181)

at com.sun.net.ssl.internal.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1035)

at com.sun.net.ssl.internal.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:124)

at com.sun.net.ssl.internal.ssl.Handshaker.processLoop(Handshaker.java:516)

at com.sun.net.ssl.internal.ssl.Handshaker.process_record(Handshaker.java:454)

at com.sun.net.ssl.internal.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:884)

at com.sun.net.ssl.internal.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1112)

at com.sun.net.ssl.internal.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1139)

at com.sun.net.ssl.internal.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1123)

at com.mysql.jdbc.ExportControlled.transformSocketToSSLSocket(ExportControlled.java:188)

... 19 more

Caused by: java.security.cert.CertificateException: java.security.cert.CertPathValidatorException: Path does not chain with any of the trust anchors

at com.mysql.jdbc.ExportControlled$X509TrustManagerWrapper.checkServerTrusted(ExportControlled.java:304)

at com.sun.net.ssl.internal.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1027)

... 27 more

Caused by: java.security.cert.CertPathValidatorException: Path does not chain with any of the trust anchors

at sun.security.provider.certpath.PKIXCertPathValidator.engineValidate(PKIXCertPathValidator.java:195)

at java.security.cert.CertPathValidator.validate(CertPathValidator.java:250)

at com.mysql.jdbc.ExportControlled$X509TrustManagerWrapper.checkServerTrusted(ExportControlled.java:297)

... 28 more

我用mysql图型界面是mysqlworkbench 8