動態自定義javabean屬性

在項目過程中遇到這樣一個需求.某個bean的屬性無法提前預知.需要在項目運行的過程中才能確定.剛開始的想法是用反射和代理.但是寫了很長時間沒寫出來.后來在網上搜了搜.有人說用javasist和cglib都能實現.一下是解決方案,拿出來和大家分享.

package com.common;
import java.util.Iterator;

import java.util.Map;

import java.util.Set;
import net.sf.cglib.beans.BeanGenerator;
import net.sf.cglib.beans.BeanMap;
/**


@author zyl 
*/

public class DynamicBean {
/**

實體Object 
*/

private  Object object = null;



/**

  * 屬??map 
  */  
private  BeanMap beanMap = null;  
/** 
 * 無參構??函數
 */
public DynamicBean() {  
    super();  
}  
/** 
 * 構??函數
 */  
@SuppressWarnings("unchecked")  
public DynamicBean(Map propertyMap) {  
  this.object = generateBean(propertyMap);  
  this.beanMap = BeanMap.create(this.object);  
}  

/** 
  * 給bean屬??賦?? 
  * @param property 屬????
  * @param value ??
  */  
public void setValue(String property, Object value) {  
  beanMap.put(property, value);  
}  

/** 
  * 通過屬??名得到屬性?? 
  * @param property 屬????
  * @return ??
  */  
public Object getValue(String property) {  
  return beanMap.get(property);  
}  

/** 
  * 得到該實體bean對象 
  * @return 
  */  
public Object getObject() {  
  return this.object;  
}  

/** 
 * @param propertyMap 
 * @return 
 */  
@SuppressWarnings("unchecked")  
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();  
}       

}
測試類
package com.common;
import java.lang.reflect.Method;
import java.util.HashMap;
public class Test1 {
public static void main(String[] args) throws ClassNotFoundException { 
        HashMap propertyMap = new HashMap();

        propertyMap.put("id", Class.forName("java.lang.Integer"));

        propertyMap.put("name", Class.forName("java.lang.String"));

        propertyMap.put("address", Class.forName("java.lang.String")); 
        propertyMap.put("age", Class.forName("java.lang.Integer")); 
        propertyMap.put("a", Class.forName("java.lang.Integer"));

    DynamicBean bean = new DynamicBean(propertyMap);  


    bean.setValue("id", new Integer(123));   
    bean.setValue("name", "454");  
    bean.setValue("address", "789");        
    bean.setValue("age", 123);  
    bean.setValue("a", 1);  




    System.out.println("  >> id      = " + bean.getValue("id"));  
    System.out.println("  >> name    = " + bean.getValue("name"));  
    System.out.println("  >> address = " + bean.getValue("address"));  
    System.out.println("  >> age = " + bean.getValue("age"));  


    Object object = bean.getObject();  


    Class clazz = object.getClass();  
    Method[] methods = clazz.getDeclaredMethods();  
    for (int i = 0; i < methods.length; i++) {  
        System.out.println(methods[i].getName());   
    }  
}  


}
大概就是這樣了.</pre>