JavaBean和Map转换封装类的方法

实例如下：
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;



public class MapUtils {

  
  @SuppressWarnings({ "unchecked", "rawtypes" })
  public final static  E get(Map map, Object key, E defaultValue) {
    Object o = map.get(key);
    if (o == null)
      return defaultValue;
    return (E) o;
  }
  
  
  @SuppressWarnings({ "rawtypes" })
  public static  List map2Java(T javaBean, List mapList) {
    if(mapList == null || mapList.isEmpty()){
      return null;
    }
    List objectList = new ArrayList();
    
    T object = null;
    for(Map map : mapList){
      if(map != null){
 object = map2Java(javaBean, map);
 objectList.add(object);
      }
    }
    
    return objectList;
    
  }
  
  
  @SuppressWarnings({ "rawtypes","unchecked", "hiding" })
  public static  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;
  }

  
  @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;
  }
 
}
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JavaBean和Map转换封装类的方法

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