
com.blade.ioc.reader.JarReaderImpl Maven / Gradle / Ivy
package com.blade.ioc.reader;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.IOException;
import java.lang.annotation.Annotation;
import java.net.JarURLConnection;
import java.net.URL;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.Set;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
/**
* 根据jar文件读取类
*
* @author biezhi
* @since 1.0
*/
public class JarReaderImpl extends AbstractClassReader implements ClassReader {
private static final Logger log = LoggerFactory.getLogger(JarReaderImpl.class);
@Override
public Set getClass(String packageName, boolean recursive) {
return this.getClassByAnnotation(packageName, null, null, recursive);
}
@Override
public Set getClass(String packageName, Class> parent, boolean recursive) {
return this.getClassByAnnotation(packageName, parent, null, recursive);
}
@Override
public Set getClassByAnnotation(String packageName, Class extends Annotation> annotation, boolean recursive) {
return this.getClassByAnnotation(packageName, null, annotation, recursive);
}
@Override
public Set getClassByAnnotation(String packageName, Class> parent, Class extends Annotation> annotation, boolean recursive) {
Set classes = new HashSet<>();
// 获取包的名字 并进行替换
String packageDirName = packageName.replace('.', '/');
// 定义一个枚举的集合 并进行循环来处理这个目录下的URL
Enumeration dirs;
try {
dirs = this.getClass().getClassLoader().getResources(packageDirName);
// 循环迭代下去
while (dirs.hasMoreElements()) {
// 获取下一个元素
URL url = dirs.nextElement();
Set subClasses = this.getClasses(url, packageDirName, packageName, parent, annotation, recursive, classes);
if (subClasses.size() > 0) {
classes.addAll(subClasses);
}
}
} catch (IOException e) {
log.error(e.getMessage(), e);
}
return classes;
}
private Set getClasses(final URL url, final String packageDirName, String packageName, final Class> parent,
final Class extends Annotation> annotation, final boolean recursive, Set classes) {
try {
if (url.toString().startsWith("jar:file:") || url.toString().startsWith("wsjar:file:")) {
// 获取jar
JarFile jarFile = ((JarURLConnection) url.openConnection()).getJarFile();
// 从此jar包 得到一个枚举类
Enumeration eje = jarFile.entries();
// 同样的进行循环迭代
while (eje.hasMoreElements()) {
// 获取jar里的一个实体 可以是目录 和一些jar包里的其他文件 如META-INF等文件
JarEntry entry = eje.nextElement();
String name = entry.getName();
// 如果是以/开头的
if (name.charAt(0) == '/') {
// 获取后面的字符串
name = name.substring(1);
}
// 如果前半部分和定义的包名相同
if (name.startsWith(packageDirName)) {
int idx = name.lastIndexOf('/');
// 如果以"/"结尾 是一个包
if (idx != -1) {
// 获取包名 把"/"替换成"."
packageName = name.substring(0, idx).replace('/', '.');
}
// 如果可以迭代下去 并且是一个包
if ((idx != -1) || recursive) {
// 如果是一个.class文件 而且不是目录
if (name.endsWith(".class") && !entry.isDirectory()) {
// 去掉后面的".class" 获取真正的类名
String className = name.substring(packageName.length() + 1, name.length() - 6);
// 添加到classes
Class> clazz = Class.forName(packageName + '.' + className);
if (null != parent && null != annotation) {
if (null != clazz.getSuperclass() &&
clazz.getSuperclass().equals(parent) && null != clazz.getAnnotation(annotation)) {
classes.add(new ClassInfo(clazz));
}
continue;
}
if (null != parent) {
if (null != clazz.getSuperclass() && clazz.getSuperclass().equals(parent)) {
classes.add(new ClassInfo(clazz));
}
continue;
}
if (null != annotation) {
if (null != clazz.getAnnotation(annotation)) {
classes.add(new ClassInfo(clazz));
}
continue;
}
classes.add(new ClassInfo(clazz));
}
}
}
}
}
} catch (IOException e) {
log.error("The scan error when the user to define the view from a jar package file.", e);
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return classes;
}
}
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