transfer between javabean and map

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1. java bean 转化成 map

import java.beans.BeanInfo;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;public class BeanToMap { public static Map<String, Object> transBean2Map(Object obj) { if(obj == null){
return null;
}
Map<String, Object> map = new HashMap<String, Object>();
try {
BeanInfo beanInfo = Introspector.getBeanInfo(obj.getClass());
PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
for (PropertyDescriptor property : propertyDescriptors) {
String key = property.getName(); // 过滤class属性
if (!key.equals("class")) {
// 得到property对应的getter方法
Method getter = property.getReadMethod();
Object value = getter.invoke(obj); map.put(key, value);
}
}
} catch (Exception e) {
System.out.println("transBean2Map Error " + e);
}
return map;
} }

2. map transfer javabean

2.1 (使用工具类BeanUtils)

import org.apache.commons.beanutils.BeanUtilspublic static void transMap2Bean(Object obj, Map map){
if(obj==null || map==null){
return ;
}
try {
BeanUtils.populate(obj, map);
} catch (IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InvocationTargetException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

2.2 利用java内省

public static void transMap2Bean(Map<String, Object> map, Object obj) { try {
BeanInfo beanInfo = Introspector.getBeanInfo(obj.getClass());
PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors(); for (PropertyDescriptor property : propertyDescriptors) {
String key = property.getName(); if (map.containsKey(key)) {
Object value = map.get(key);
// 得到property对应的setter方法
Method setter = property.getWriteMethod();
setter.invoke(obj, value);
} } } catch (Exception e) {
System.out.println("transMap2Bean Error " + e);
} return; }