我现在是一个 java 新手，我想做的就是将 MySQL 日志记录添加到这个用于 Minecraft 服务器的 Java 代理中。
当程序在 NetBeans 中运行时，程序运行良好，没有任何错误。但是，当构建一个 jar 并从该 jar 运行程序时，登录到 Minecraft 服务器时会引发此错误：
SQLNestedException 出错：无法为连接 URL 'jdbc:mysql://localhost:3306/userips'@org.apache.commons.dbcp.BasicDataSource:1452 创建类 'com.mysql.jdbc.Driver' 的 JDBC 驱动程序
基本上它应该做的是记录用户IP、用户名、登录时间和日期。
我正在使用 Netbeans IDE 7.2.1 并使用 Maven 构建 jar 来处理所有依赖项。
我使用 maven 将 commons-dbcp-1.4.jar、mysql-connector-java-5.1.22.jar 和 commons-pool-1.5.4.jar 导入到我的依赖项中，它们位于 jar 文件中。
这是建立连接的类：
import java.sql.Connection;
import java.sql.SQLException;
import org.apache.commons.dbcp.BasicDataSource;
public final class ConnectionPooler {
public static final Configuration config = new Configuration();
private static final BasicDataSource dataSource = new BasicDataSource();
static {
config.load();
dataSource.setDriverClassName("com.mysql.jdbc.Driver");
dataSource.setUrl(config.sql_url);
dataSource.setUsername(config.sql_user);
dataSource.setPassword(config.sql_pass);
dataSource.setInitialSize(5);
dataSource.setMaxActive(30);
}
public static Connection getConnection() throws SQLException {
return dataSource.getConnection();
}
}
这是执行 mysql 查询和所有操作的类：
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.TimeZone;
public class IPLogger {
public boolean logip(String player, String ipp) throws SQLException {
Connection connection = null;
PreparedStatement statement = null;
ResultSet resultSet = null;
Calendar now = Calendar.getInstance();
TimeZone timeZone1 = now.getTimeZone();
String timeZone = timeZone1.getDisplayName();
DateFormat dateFormat = new SimpleDateFormat("MM/dd/yyyy");
DateFormat timeFormat = new SimpleDateFormat("HH:mm:ss");
Date date1 = new Date();
Date date2 = new Date();
String date;
String time;
date = dateFormat.format(date1);
time = timeFormat.format(date2);
String SQL_EXIST = "INSERT INTO `proxyips` (`username`, `ip`,`date`,`time`) VALUES ('"+player+"', '"+ipp+"','"+date+"','"+time+" "+timeZone+"')";
try{
connection = ConnectionPooler.getConnection();
statement = connection.prepareStatement(SQL_EXIST);
statement.executeUpdate();
} finally {
if (resultSet != null) {
try { resultSet.close(); } catch (SQLException ignore) {ignore.printStackTrace(); }
}
if (statement != null) {
try { statement.close(); } catch (SQLException ignore) {ignore.printStackTrace(); }
}
if (connection != null) {
try { connection.close(); } catch (SQLException ignore) {ignore.printStackTrace(); }
}
}
return true;
}
}
这是 pom.xml，以防我在构建时遇到一些错误或类似的错误：
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>net.md-5</groupId>
<artifactId>BungeeCordKC</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<name>BungeeCordKC</name>
<url>http://maven.apache.org</url>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.3.2</version>
<configuration>
<source>1.7</source>
<target>1.7</target>
<showDeprecation>false</showDeprecation>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>2.0</version>
<configuration>
<filters>
<filter>
<artifact>*:*</artifact>
<excludes>
<exclude>**/*.java</exclude>
<exclude>**/*.properties</exclude>
<exclude>**/*.SF</exclude>
<exclude>**/*.DSA</exclude>
</excludes>
</filter>
</filters>
</configuration>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>2.4</version>
<configuration>
<archive>
<manifestEntries>
<Main-Class>${main.class}</Main-Class>
<Implementation-Version>${describe}</Implementation-Version>
</manifestEntries>
</archive>
</configuration>
</plugin>
</plugins>
</build>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<build.number>unknown</build.number>
<main.class>net.md_5.bungee.BungeeCord</main.class>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.yaml</groupId>
<artifactId>snakeyaml</artifactId>
<version>1.11</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>0.11.4</version>
</dependency>
<dependency>
<groupId>com.google.guava</groupId>
<artifactId>guava</artifactId>
<version>13.0.1</version>
</dependency>
<dependency>
<groupId>com.google.code.findbugs</groupId>
<artifactId>annotations</artifactId>
<version>2.0.1</version>
</dependency>
<dependency>
<groupId>org.bouncycastle</groupId>
<artifactId>bcprov-ext-jdk15on</artifactId>
<version>1.47</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.22</version>
<type>jar</type>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>commons-dbcp</groupId>
<artifactId>commons-dbcp</artifactId>
<version>1.4</version>
</dependency>
<dependency>
<artifactId>commons-pool</artifactId>
<groupId>commons-pool</groupId>
<type>jar</type>
<version>1.5.4</version>
</dependency>
</dependencies>
</project>
如果有人知道出了什么问题，或者您对我如何设置环境有任何疑问，请告诉我。
编辑：当我将该 catch 语句添加到 try 块时，这是完整的堆栈跟踪。
org.apache.commons.dbcp.SQLNestedException: Cannot create JDBC driver of class '
com.mysql.jdbc.Driver' for connect URL 'jdbc:mysql://localhost.com:3306/use
rips'
at org.apache.commons.dbcp.BasicDataSource.createConnectionFactory(Basic
DataSource.java:1452)
at org.apache.commons.dbcp.BasicDataSource.createDataSource(BasicDataSou
rce.java:1371)
at org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource
.java:1044)
at net.md_5.bungee.ConnectionPooler.getConnection(ConnectionPooler.java:
30)
at net.md_5.bungee.IPLogger.logip(IPLogger.java:44)
at net.md_5.bungee.InitialHandler.run(InitialHandler.java:77)
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ExceptionInInitializerError
at com.mysql.jdbc.Util.stackTraceToString(Util.java:355)
at com.mysql.jdbc.Util.<clinit>(Util.java:120)
at com.mysql.jdbc.NonRegisteringDriver.parseURL(NonRegisteringDriver.jav
a:764)
at com.mysql.jdbc.NonRegisteringDriver.acceptsURL(NonRegisteringDriver.j
ava:265)
at java.sql.DriverManager.getDriver(Unknown Source)
at org.apache.commons.dbcp.BasicDataSource.createConnectionFactory(Basic
DataSource.java:1437)
... 11 more
Caused by: java.lang.RuntimeException: Can't load resource bundle due to underly
ing exception java.util.MissingResourceException: Can't find bundle for base nam
e com.mysql.jdbc.LocalizedErrorMessages, locale en_US
at com.mysql.jdbc.Messages.<clinit>(Messages.java:61)
... 17 more
Caused by: java.util.MissingResourceException: Can't find bundle for base name c
om.mysql.jdbc.LocalizedErrorMessages, locale en_US
at java.util.ResourceBundle.throwMissingResourceException(Unknown Source
)
at java.util.ResourceBundle.getBundleImpl(Unknown Source)
at java.util.ResourceBundle.getBundle(Unknown Source)
at com.mysql.jdbc.Messages.<clinit>(Messages.java:59)
... 17 more