寫帖子是為了讓更多的程序員減少再調(diào)試bug中的時(shí)間，也希望大家能一起把自己遇到的錯(cuò)誤及解決方法寫出來。我是一個(gè)剛開始學(xué)java的大二學(xué)生，用的是《java開發(fā)實(shí)戰(zhàn)經(jīng)典》。在寫p646的程序中一直報(bào)錯(cuò)。特貼出來

先把代碼發(fā)出來

public class ConnectionDemo02 {

//定義MySql的數(shù)據(jù)庫(kù)驅(qū)動(dòng)程序

public static final String DBDRIVER="com.mysql.jdbc.Driver";? ?//錯(cuò)誤，應(yīng)改為com.mysql.cj.jdbc.Driver

//定義MySql數(shù)據(jù)庫(kù)的鏈接地址

public static final String DBURL="jdbc:mysql://localhost:3306/mldn";

//錯(cuò)誤，應(yīng)該改為：jdbc:mysql://localhost:3306/mldn?useSSL=false&serverTimezone=GMT";//定義MySql數(shù)據(jù)庫(kù)的連接用戶名

public static final String DBUSER="root";

//定義MySql數(shù)據(jù)庫(kù)的連接密碼

public static final String DBPASS="12315";

public static void main(String[] args)

{

Connection conn=null;

try

{

Class.forName(DBDRIVER);

}catch(ClassNotFoundException e)

{

e.printStackTrace();

}

try

{

conn=DriverManager.getConnection(DBURL, DBUSER, DBPASS);

}catch(SQLException e)

{

e.printStackTrace();

}

System.out.println(conn);

try

{

conn.close();

}catch(SQLException e)

{

e.printStackTrace();

}

}

報(bào)錯(cuò)是

Loading class `com.mysql.jdbc.Driver'. This is deprecated. The new driver class is `com.mysql.cj.jdbc.Driver'. The driver is automatically registered via the SPI and manual loading of the driver class is generally unnecessary.

Sat May 05 09:24:57 GMT+08:00 2018 WARN: Establishing SSL connection without server's identity verification is not recommended. According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must be established by default if explicit option isn't set. For compliance with existing applications not using SSL the verifyServerCertificate property is set to 'false'. You need either to explicitly disable SSL by setting useSSL=false, or set useSSL=true and provide truststore for server certificate verification.

java.sql.SQLException: The server time zone value '???ú±ê×??±??' is unrecognized or represents more than one time zone. You must configure either the server or JDBC driver (via the serverTimezone configuration property) to use a more specifc time zone value if you want to utilize time zone support.

at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:127)

at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:95)

at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:87)

at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:61)

at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:71)

at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:76)

at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:862)

at com.mysql.cj.jdbc.ConnectionImpl.(ConnectionImpl.java:444)

at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:230)

at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:226)

at java.sql.DriverManager.getConnection(DriverManager.java:664)

at java.sql.DriverManager.getConnection(DriverManager.java:247)

at 連接數(shù)據(jù)庫(kù).ConnectionDemo02.main(ConnectionDemo02.java:28)

Caused by: com.mysql.cj.exceptions.InvalidConnectionAttributeException: The server time zone value '???ú±ê×??±??' is unrecognized or represents more than one time zone. You must configure either the server or JDBC driver (via the serverTimezone configuration property) to use a more specifc time zone value if you want to utilize time zone support.

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

at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)

at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)

at java.lang.reflect.Constructor.newInstance(Constructor.java:423)

at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:59)

at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:83)

at com.mysql.cj.util.TimeUtil.getCanonicalTimezone(TimeUtil.java:128)

at com.mysql.cj.protocol.a.NativeProtocol.configureTimezone(NativeProtocol.java:2201)

at com.mysql.cj.protocol.a.NativeProtocol.initServerSession(NativeProtocol.java:2225)

at com.mysql.cj.jdbc.ConnectionImpl.initializePropsFromServer(ConnectionImpl.java:1391)

at com.mysql.cj.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:993)

at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:852)

... 6 more

null

Exception in thread "main" java.lang.NullPointerException

at 連接數(shù)據(jù)庫(kù).ConnectionDemo02.main(ConnectionDemo02.java:36)改正方法在原碼有

總結(jié)

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