java 加载jar_java – 在运行时加载jar
我试图在运行时将jar文件添加到classpath.我用这个代码
public static void addURL(URL u) throws IOException {
URLClassLoader sysloader = (URLClassLoader) ClassLoader
.getSystemClassLoader();
Class sysclass = URLClassLoader.class;
try {
Method method = sysclass.getDeclaredMethod("addURL", parameters);
method.setAccessible(true);
method.invoke(sysloader, new Object[] { u });
System.out.println(u);
} catch (Throwable t) {
t.printStackTrace();
throw new IOException("Error");
}
}
系统输出打印此网址：
file:/B:/Java/Tools/mysql-connector-java-5.1.18/mysql-connector-java-5.1.18/mysql-connector-java-5.1.18-bin.jar
我仔细检查了这条路,这个罐子存在.即使这个测试显示com.mysql.jdbc.
驱动程序类存在.
javap -classpath "B:\Java\Tools\mysql-connector-java-5.1.18\
mysql-connector-java-5.1.18\mysql-connector-java-5.1.18-bin.jar" com.mysql.jdbc.
Driver
Compiled from "Driver.java"
public class com.mysql.jdbc.Driver extends com.mysql.jdbc.NonRegisteringDriver i
mplements java.sql.Driver{
public com.mysql.jdbc.Driver() throws java.sql.SQLException;
static {};
}
但是当我使用这个Class.forName(驱动程序)时,我仍然得到java.lang.ClassNotFoundException.
这段代码有什么问题？