有一个众所周知的技巧URLClassLoader。通过使用它，我们可以jsch访问ant-jsch.
我想知道classloadertask@user3499805 的回答是如何工作的。
<target name="injectJsch" description="inject jsch jar">
<makeurl file="${acdc.java.tools}/lib/jsch-0.1.50.jar" property="jsch.jar.url"/>
<taskdef name="injectJsch"
classname="tools.deployments.ant.InjectJsch"
classpath="${basedir}/jars/ajwf_deploytools.jar"
/>
<injectJsch jarLocation="${jsch.jar.url}"/>
</target>
_
package tools.deployments.ant;
import java.lang.reflect.Method;
import java.net.URL;
import java.net.URLClassLoader;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Task;
import org.apache.tools.ant.taskdefs.optional.ssh.LogListener;
public class InjectJsch extends Task {
public void setJarLocation(final String jarLocation) {
this.jarLocation = jarLocation;
}
@Override
public void execute() throws BuildException {
try {
injectJsch(new URL(jarLocation));
} catch (final Exception e) {
throw new BuildException(e);
}
}
public static void injectJsch(final URL jarLocation) throws Exception {
ClassLoader parent = LogListener.class.getClassLoader();
try {
parent.loadClass(TESTCLASS);
} catch (final ClassNotFoundException e) {
final Method addURLmethod = URLClassLoader.class.getDeclaredMethod("addURL", URL.class);
addURLmethod.setAccessible(true);
ClassLoader cl;
do {
cl = parent;
if (cl instanceof URLClassLoader) {
addURLmethod.invoke(cl, jarLocation);
break;
}
parent = cl.getParent();
} while (parent != cl && parent != null);
LogListener.class.getClassLoader().loadClass(TESTCLASS);
}
}
private String jarLocation;
private static final String TESTCLASS = "com.jcraft.jsch.UserInfo";
}