求帮助JDBC连接MySql数据库失败

导入连接的jar包

写入连接文件

private final static String DRIVER = "com.mysql.jdbc.Driver"

private final static String URL = "jdbc:mysql://localhost:3306/tojapanonlinetest?useUnicode=true&characterEncoding=UTF-8"

private final static String USERNAME = "root"

private final static String PASSWORD = "root"

public static Connection getConnection() {

Connection con = null

try {

Class.forName(DRIVER)

con = DriverManager.getConnection(URL, USERNAME, PASSWORD)

// System.out.println("连接成功")

} catch (ClassNotFoundException e) {

e.printStackTrace()

} catch (SQLException e) {

e.printStackTrace()

}

return con

}

java向数据库中插入数据，可以使用mysql数据库，使用statement类来 *** 作数据库，示例如下：

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Connection conn = null

Statement st = null

try {

Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver")//加载驱动类

conn = DriverManager.getConnection("jdbc:microsoft:sqlserver://<server_name>:<1433>", "name","pwd")

conn.setAutoCommit(false)

st = conn.createStatement()

// 模拟一个 str[i] = nd.getNodeValue().trim()

String[] str = new String[] { "aaa", "bbb", "ccc", "ddd", "eee","fff" }

String sqlStr = null

for (int i = 0i <str.lengthi++) {

sqlStr = "INSERT INTO <TABLENAME>(<COLNAME>)VALUES('" + str[i] + "')"//向数据库中插入数据

st.executeUpdate(sqlStr)

}

conn.commit()

} catch (Exception e) {

e.printStackTrace()

} finally {//释放数据库的资源

try {

if (st != null)

st.close()

if(conn != null &&!conn.isClosed()){

conn.close()

}

} catch (SQLException e) {

e.printStackTrace()

}

}

当我用JDBC连接MySql数据库时，编译报了如下错误：

错误1：

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.

这要求我们注册驱动时，把Class.forName("com.mysql.jdbc.Driver")改成 Class.forName("com.mysql.cj.jdbc.Driver")

当我信息满满的修改之后重新编译时，再次出现了错误：

错误2：

Fri Feb 22 08:55:38 CST 2019 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.

这要求我们在设置url参数时，将useSSL=false，修改后 jdbc:mysql://localhost:3306/ds3?useSSL=false

当我修改后，本以为这下应该没问题了，没想到，再一次出现了问题

错误3：

Exception in thread "main" java.sql.SQLException: The server time zone value 'Öйú±ê׼ʱ¼ä' 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.

这要求我们修改时区，修改成jdbc:mysql://localhost:3306/ds3?useSSL=false&serverTimezone=UTC

终于，不在报错误了。

错误4：当我们配置xml文件时，要把&转为其本身的转义字符

配置properties文件的urlurl=jdbc:mysql:///ds3?useSSL=false&serverTimezone=UTC配置xml文件的url<property name="url">jdbc:mysql://localhost:3306/ds3?useSSL=false&serverTimezone=UTC</property>

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