net.unmz.java.util.bean.ClassUtils Maven / Gradle / Ivy
package net.unmz.java.util.bean;
import net.sf.cglib.beans.BeanGenerator;
import net.sf.cglib.beans.BeanMap;
import java.beans.BeanInfo;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
/**
* Project Name:
* 功能描述：
* 参考链接1: https://blog.csdn.net/y526089989/article/details/89389087
* 参考链接2: https://blog.csdn.net/wengerwss/article/details/52597627
*
* @author [email protected]
* @version 1.0
* @date 2020/3/27 16:10
* @since JDK 1.8
*/
public class ClassUtils {
/**
* @param object 旧的对象带值
* @param addMap 动态需要添加的属性和属性类型
* @param addValMap 动态需要添加的属性和属性值
* @return 新的对象
* @throws Exception
*/
public static Object dynamicClass(Object object, HashMap addMap, HashMap addValMap) throws Exception {
HashMap returnMap = new HashMap<>();
HashMap typeMap = new HashMap<>();
Class type = object.getClass();
BeanInfo beanInfo = Introspector.getBeanInfo(type);
PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
for (PropertyDescriptor descriptor : propertyDescriptors) {
String propertyName = descriptor.getName();
if (!propertyName.equals("class")) {
Method readMethod = descriptor.getReadMethod();
Object result = readMethod.invoke(object);
//可以判断为 NULL不赋值
returnMap.put(propertyName, result);
typeMap.put(propertyName, descriptor.getPropertyType());
}
}
returnMap.putAll(addValMap);
typeMap.putAll(addMap);
//map转换成实体对象
DynamicBean bean = new DynamicBean(typeMap);
//赋值
Set keys = typeMap.keySet();
for (String key : keys) {
bean.setValue(key, returnMap.get(key));
}
return bean.getObject();
}
static class DynamicBean {
private Object object = null; //动态生成的类
private BeanMap beanMap = null; //存放属性名称以及属性的类型
public DynamicBean() {
super();
}
public DynamicBean(Map propertyMap) {
this.object = generateBean(propertyMap);
this.beanMap = BeanMap.create(this.object);
}
/**
* @param propertyMap
* @return
*/
private Object generateBean(Map propertyMap) {
BeanGenerator generator = new BeanGenerator();
Set keySet = propertyMap.keySet();
for (Iterator i = keySet.iterator(); i.hasNext(); ) {
String key = (String) i.next();
generator.addProperty(key, (Class) propertyMap.get(key));
}
return generator.create();
}
/**
* 给bean属性赋值
*
* @param property 属性名
* @param value 值
*/
public void setValue(Object property, Object value) {
beanMap.put(property, value);
}
/**
* 通过属性名得到属性值
*
* @param property 属性名
* @return 值
*/
public Object getValue(String property) {
return beanMap.get(property);
}
/**
* 得到该实体bean对象
*
* @return
*/
public Object getObject() {
return this.object;
}
}
}