ClassUtil.java
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package com.genersoft.iot.vmp.jt1078.util;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.core.io.support.ResourcePatternResolver;
import java.lang.annotation.Annotation;
import java.util.LinkedList;
import java.util.List;
public class ClassUtil {
private static final Logger logger = LoggerFactory.getLogger(ClassUtil.class);
public static Object getBean(Class<?> clazz) {
if (clazz != null) {
try {
return clazz.getDeclaredConstructor().newInstance();
} catch (Exception ex) {
logger.error("ClassUtil:找不到指定的类", ex);
}
}
return null;
}
public static Object getBean(String className) {
Class<?> clazz = null;
try {
clazz = Class.forName(className);
} catch (Exception ex) {
logger.error("ClassUtil:找不到指定的类");
}
if (clazz != null) {
try {
//获取声明的构造器--》创建实例
return clazz.getDeclaredConstructor().newInstance();
} catch (Exception ex) {
logger.error("ClassUtil:找不到指定的类", ex);
}
}
return null;
}
/**
* 获取包下所有带注解的class
*
* @param packageName 包名
* @param annotationClass 注解类型
* @return list
*/
public static List<Class<?>> getClassList(String packageName, Class<? extends Annotation> annotationClass) {
List<Class<?>> classList = getClassList(packageName);
classList.removeIf(next -> !next.isAnnotationPresent(annotationClass));
return classList;
}
public static List<Class<?>> getClassList(String... packageName) {
List<Class<?>> classList = new LinkedList<>();
for (String s : packageName) {
List<Class<?>> c = getClassList(s);
classList.addAll(c);
}
return classList;
}
public static List<Class<?>> getClassList(String packageName) {
List<Class<?>> classList = new LinkedList<>();
try {
ResourcePatternResolver resourcePatternResolver = new PathMatchingResourcePatternResolver();
Resource[] resources = resourcePatternResolver.getResources(packageName.replace(".", "/") + "/**/*.class");
for (Resource resource : resources) {
String url = resource.getURL().toString();
String[] split = url.split(packageName.replace(".", "/"));
String s = split[split.length - 1];
String className = s.replace("/", ".");
className = className.substring(0, className.lastIndexOf("."));
doAddClass(classList, packageName + className);
}
} catch (Exception e) {
throw new RuntimeException(e);
}
return classList;
}
private static void doAddClass(List<Class<?>> classList, String className) {
Class<?> cls = loadClass(className, false);
classList.add(cls);
}
public static Class<?> loadClass(String className, boolean isInitialized) {
Class<?> cls;
try {
cls = Class.forName(className, isInitialized, getClassLoader());
} catch (ClassNotFoundException e) {
throw new RuntimeException(e);
}
return cls;
}
public static ClassLoader getClassLoader() {
return Thread.currentThread().getContextClassLoader();
}
}