java动态加载jar包

java动态加载jar包

package org.util;

import java.io.File;
import java.io.IOException;
import https://www.sodocs.net/doc/b18334322.html,.MalformedURLException;
import https://www.sodocs.net/doc/b18334322.html,.URL;
import https://www.sodocs.net/doc/b18334322.html,.URLClassLoader;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import DC.Utility.Configuration;

public class ClassLoad {
static URLClassLoader loader = null;

/**
* 在默认的目录加载jar
* @return
*/
public static URLClassLoader getClassLoad() {
Configuration config = new Configuration(Configuration.getRoot()+File.separator
+ "classpath.properties");
if (loader == null) {
URLClassLoaderUtil urlClass = new URLClassLoaderUtil(config
.getValue("classpath1"), false);
loader = urlClass.getClassLoader();
}
return loader;
}
/**
* 在给定的路径加载jar文件
* @param url 指定路径
* @param isFile true 文件 false 目录
* @return
*/
public static URLClassLoader getClassLoad(String url, boolean isFile)
{
URLClassLoaderUtil urlClass = new URLClassLoaderUtil(url, false);
URLClassLoader loader = urlClass.getClassLoader();
return loader;
}
}



class URLClassLoaderUtil {
URLClassLoader classLoader = null;// URLClassLoader类载入器
private String jarFileName;
private boolean isFile = true;
List jars = new ArrayList(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 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[jar

URLs.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 en = jarFile.entries();
while (en.hasMoreElements()) {
JarEntry je = en.nextElement();
String name = je.getName();
String s5 = name.replace('/', '.');
if (https://www.sodocs.net/doc/b18334322.html,stIndexOf(".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 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 jarList = new ArrayList();
List filesURL = new ArrayList();

/**
* 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 getFiles() {
// TODO Auto-generated method stub
return filesURL;
}

/**
* 获取文件路径
*
* @return
*/
public List getFilesURL() {
// TODO Auto-generated method stub
return filesURL;
}

}


参考：
https://www.sodocs.net/doc/b18334322.html,/langlang/archive/2010/11/28/

1890632.html
https://www.sodocs.net/doc/b18334322.html,/s/blog_56e2f4250100lvzc.html