package com.triman.utils;
import java.net.URL;
import java.net.URLClassLoader;
public class URLClassLoaderUtil extends URLClassLoader {
public URLClassLoaderUtil(URL url) {
super(new URL[] { url });
}
public static Object load(String str, String cls) {
Class<?> c = null;
try {
URL url = new URL(str);
URLClassLoaderUtil t = new URLClassLoaderUtil(url);
c = t.findClass(cls);
} catch (Exception ex) {
ex.printStackTrace();
}
return c;
}
}
============
package com.triman.utils;
import java.io.File;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
public class URLClassLoaderUtil {
URLClassLoader classLoader = null;// URLClassLoader类载入器
private String jarFileName;
private boolean isFile = true;
List<String> jars = new ArrayList<String>(0);
/**
*
* 加载具体的某一jar包
*
*
*
* @param jarFileName
*
*/
public URLClassLoaderUtil(String jarFileName) {
this.setJarFileName(jarFileName);
this.inti();
}
/**
*
* 加载jar包 当isFile为false是加载文件夹下所有jar
*
*
*
* @param jarFileName
*
* 路径
*
* @param isFile
*
*/
public URLClassLoaderUtil(String jarFileName, boolean isFile) {
this.setJarFileName(jarFileName);
this.setFile(isFile);
this.inti();
}
/**
*
* 初始化，读取文件信息，并将jar文件路径加入到classpath
*
*/
private void inti() {
// 添加jar文件路径到classpath
if (this.isFile) {
File f = new File(jarFileName);
addPath(f.toURI().toString());
jars.add(f.getAbsolutePath());
} else {
ReadJarFile df = new ReadJarFile(jarFileName, new String[] { "jar",
"zip" });
this.jars = df.getFiles();
List<String> jarURLs = df.getFilesURL();
Object[] o = jarURLs.toArray();
addPath(o);
}
}
/**
*
* 回叫方法，class操作
*
*
*
* @paramcallBack
*
*/
public void callBack() {
for (String s : this.jars) {
loadClass(s);
}
}
/**
*
* 添加单个jar路径到classpath
*
*
*
* @paramjarURL
*
*/
private void addPath(String jarURL) {
try {
classLoader = new URLClassLoader(new URL[] { new URL(jarURL) });
} catch (MalformedURLException e) {
e.printStackTrace();
}
}
/**
*
* 添加jar路径到classpath
*
*
*
* @paramjarURLs
*
*/
private void addPath(Object[] jarURLs) {
URL[] urls = new URL[jarURLs.length];
for (int i = 0; i < jarURLs.length; i++) {
try {
System.out.println(jarURLs[i].toString());
urls[i] = new URL(jarURLs[i].toString());
} catch (MalformedURLException e) {
e.printStackTrace();
}
}
classLoader = new URLClassLoader(urls);
}
/**
*
* 动态载入class
*
*
*
* @paramjarFileName
*
* @paramcallBack
*
*/
// private void loadClass(String jarFileName, ClassCallBack callBack) {
private void loadClass(String jarFileName) {
JarFile jarFile = null;
try {
jarFile = new JarFile(jarFileName);
} catch (IOException e) {
e.printStackTrace();
}
Enumeration<JarEntry> en = jarFile.entries();
while (en.hasMoreElements()) {
JarEntry je = en.nextElement();
String name = je.getName();
String s5 = name.replace('/', '.');
if (s5.lastIndexOf(".class") > 0) {
String className = je.getName().substring(0,
je.getName().length() - ".class".length()).replace('/',
'.');
Class c = null;
try {
c = this.classLoader.loadClass(className);
System.out.println(className);
} catch (ClassNotFoundException e) {
System.out.println("NO CLASS: " + className);
// continue;
} catch (NoClassDefFoundError e) {
System.out.println("NO CLASS: " + className);
// continue;
}
// callBack.operate(c);
}
}
}
public Class loadClass(String jarFileName,String className) {
JarFile jarFile = null;
Class c = null;
try {
jarFile = new JarFile(jarFileName);
c = this.classLoader.loadClass(className);
System.out.println(className);
} catch (IOException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return c;
}
public String getJarFileName() {
return jarFileName;
}
/**
*
* 设置jar路径
*
*
*
* @param jarFileName
*
*/
public void setJarFileName(String jarFileName) {
this.jarFileName = jarFileName;
}
public boolean isFile() {
return isFile;
}
public URLClassLoader getClassLoader() {
return classLoader;
}
public void setClassLoader(URLClassLoader classLoader) {
this.classLoader = classLoader;
}
public void setFile(boolean isFile) {
this.isFile = isFile;
}
}
/**
*
* 读取jarwenjian
*
* @author hml
*
*
*
*/
class ReadJarFile {
List<String> jarList = new ArrayList<String>();
List<String> filesURL = new ArrayList<String>();
/**
*
* 读取指定文件夹的文件
*
*
*
* @param jarFileName
*
* 路径
*
* @param strings
*
* 后缀
*
*/
public ReadJarFile(String jarFileName, String[] strings) {
// TODO Auto-generated constructor stub
File f = new File(jarFileName);
File[] fl = f.listFiles();
for (File file : fl) {
for (String str : strings) {
if (file.getName().endsWith(str)) {
jarList.add(file.getName());
filesURL.add(file.toURI().toString());
}
}
}
}
/**
*
* 获取文件名
*
*
*
* @return
*
*/
public List<String> getFiles() {
// TODO Auto-generated method stub
return filesURL;
}
/**
*
* 获取文件路径
*
*
*
* @return
*
*/
public List<String> getFilesURL() {
// TODO Auto-generated method stub
return filesURL;
}
}
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