JavaBean和Map转换封装类详解编程语言

package com.ljq.util; 
import java.beans.BeanInfo; 
import java.beans.Introspector; 
import java.beans.PropertyDescriptor; 
import java.lang.reflect.Method; 
import java.util.ArrayList; 
import java.util.HashMap; 
import java.util.List; 
import java.util.Map; 
/** 
* Map工具类 
* 
* @author jqlin 
*/ 
public class MapUtils { 
/** 
* 从map集合中获取属性值 
*  
* @param <E> 
* @param map 
*            map集合 
* @param key 
*            键对 
* @param defaultValue 
*            默认值 
* @return 
* @author jiqinlin 
*/ 
@SuppressWarnings({ "unchecked", "rawtypes" }) 
public final static <E> E get(Map map, Object key, E defaultValue) { 
Object o = map.get(key); 
if (o == null) 
return defaultValue; 
return (E) o; 
} 
/** 
* Map集合对象转化成 JavaBean集合对象 
*  
* @param javaBean JavaBean实例对象 
* @param mapList Map数据集对象 
* @return 
* @author jqlin 
*/ 
@SuppressWarnings({ "rawtypes" }) 
public static <T> List<T> map2Java(T javaBean, List<Map> mapList) { 
if(mapList == null || mapList.isEmpty()){ 
return null; 
} 
List<T> objectList = new ArrayList<T>(); 
T object = null; 
for(Map map : mapList){ 
if(map != null){ 
object = map2Java(javaBean, map); 
objectList.add(object); 
} 
} 
return objectList; 
} 
/** 
* Map对象转化成 JavaBean对象 
*  
* @param javaBean JavaBean实例对象 
* @param map Map对象 
* @return 
* @author jqlin 
*/ 
@SuppressWarnings({ "rawtypes","unchecked", "hiding" }) 
public static <T> T map2Java(T javaBean, Map map) { 
try { 
// 获取javaBean属性 
BeanInfo beanInfo = Introspector.getBeanInfo(javaBean.getClass()); 
// 创建 JavaBean 对象 
Object obj = javaBean.getClass().newInstance(); 
PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors(); 
if (propertyDescriptors != null && propertyDescriptors.length > 0) { 
String propertyName = null; // javaBean属性名 
Object propertyValue = null; // javaBean属性值 
for (PropertyDescriptor pd : propertyDescriptors) { 
propertyName = pd.getName(); 
if (map.containsKey(propertyName)) { 
propertyValue = map.get(propertyName); 
pd.getWriteMethod().invoke(obj, new Object[] { propertyValue }); 
} 
} 
return (T) obj; 
} 
} catch (Exception e) { 
e.printStackTrace(); 
} 
return null; 
} 
/** 
* JavaBean对象转化成Map对象 
*  
* @param javaBean 
* @return 
* @author jqlin 
*/ 
@SuppressWarnings({ "rawtypes", "unchecked" }) 
public static Map java2Map(Object javaBean) { 
Map map = new HashMap(); 
try { 
// 获取javaBean属性 
BeanInfo beanInfo = Introspector.getBeanInfo(javaBean.getClass()); 
PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors(); 
if (propertyDescriptors != null && propertyDescriptors.length > 0) { 
String propertyName = null; // javaBean属性名 
Object propertyValue = null; // javaBean属性值 
for (PropertyDescriptor pd : propertyDescriptors) { 
propertyName = pd.getName(); 
if (!propertyName.equals("class")) { 
Method readMethod = pd.getReadMethod(); 
propertyValue = readMethod.invoke(javaBean, new Object[0]); 
map.put(propertyName, propertyValue); 
} 
} 
} 
} catch (Exception e) { 
e.printStackTrace(); 
}   
return map; 
} 
}