java动态加载jar包
package org.util;
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;
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<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 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;
}
}
/**
* project：codecreate
* package：com.bluedavid.util
* file：DriverUtil.java
* date：2009-12-15 下午12:35:59
*/
package com.bluedavid.util;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.Set;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
/**
* description
*
* @author
*
*/
public class DriverUtil {
/**
* description:由一个jar文件中取出所有的驱动类
*
* @param file *.jar，绝对路径
* @return 返回所有驱动类
*/
public static Set<String> getDrivers(String file) {
JarFile jar = null;
Set<String> set = new HashSet<String>();
try {
jar = new JarFile(file);
} catch (IOException e) {
return null;
}
Enumeration<JarEntry> entries = jar.entries();
URLClassLoader loader = getLoad(file);
String name;
while(entries.hasMoreElements()) {
JarEntry entry = entries.nextElement();
if(entry.getName().endsWith("Driver.class")) {
name = entry.getName();
name = name.substring(0, name.length() - 6);
name = name.replaceAll("/", ".");
Class<?> cc = null;
try {
cc = loader.loadClass(name);
} catch (ClassNotFoundException e) {
continue;
}
if(isDriver(cc))
set.add(name);
}
}
return set;
}
/**
* description:判断是否是数据驱动
*
* @param clazz
* @return
*/
public static boolean isDriver(Class<?> clazz) {
Class<?>[] ccc = clazz.getInterfaces();
boolean flag = false;
for(Class<?> aa : ccc) {
if(aa.getName().equals("java.sql.Driver")) {
flag = true;
}
}
if(!flag) {
for (; clazz != null; clazz = clazz.getSuperclass()) {
Class<?>[] interfaces = clazz.getInterfaces();
for(Class<?> aa : interfaces) {
if(aa.getName().equals("java.sql.Driver")) {
flag = true;
}
}
}
}
return flag;
}
/**
* description:根据一个文件(jar)，返回一个ClassLoader
*
* @param file *.jar，绝对路径
* @return 返回一个ClassLoader
*/
public static URLClassLoader getLoad(String file) {
URL[] url = null;
try {
url = new URL[]{new URL("file:"+file)};
} catch (MalformedURLException e) {
return null;
}
URLClassLoader loader = new URLClassLoader(url);
return loader;
}
/**
* description:
*
* @param file 一个jar文件(绝对路径)
* @param clazz 需要加载的class路径com.mysql.jdbc.MysqlDriver
* @return
*/
public static Class<?> getDynamic(String file, String clazz) {
URLClassLoader loader = getLoad(file);
try {
return loader.loadClass(clazz);
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
return null;
}
}