涉及内容:
Java反射机制:https://blog.youkuaiyun.com/sinat_38259539/article/details/71799078
JavaBean规范:https://blog.youkuaiyun.com/zdwzzu2006/article/details/5151788/
Java内省机制:https://blog.youkuaiyun.com/hahalzb/article/details/5972421
package com.passer.introspector;
import java.beans.BeanInfo;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
public class BeanUtils {
public static void main(String []args) throws Exception {
User user=new User();
user.setName("passer");
user.setDescri("cool");
Map<Object,Object> map=bean2map(user);
System.out.println(map);
Object obj=map2bean(map,User.class);
System.out.println(obj);
}
private static <T> T map2bean(Map<Object,Object> map,Class<T> beanType) throws Exception {
T t=beanType.newInstance();
PropertyDescriptor [] pds=Introspector.getBeanInfo(beanType,Object.class)
.getPropertyDescriptors();
for (PropertyDescriptor pd : pds) {
for (Entry entry : map.entrySet()) {
if(entry.getKey().equals(pd.getName())) {
pd.getWriteMethod().invoke(t, entry.getValue());
}
}
}
return t;
}
private static Map<Object,Object> bean2map(Object bean) throws Exception {
Map<Object,Object> map=new HashMap<>();
BeanInfo info=Introspector.getBeanInfo(bean.getClass(),Object.class);
PropertyDescriptor []pds=info.getPropertyDescriptors();
for(PropertyDescriptor pd:pds) {
Object key=pd.getName();
Object value= pd.getReadMethod().invoke(bean);
map.put(key, value);
}
return map;
}
}