Request To JavaBean(请求对象转换为JavaBean对象)

背景: 
经常要从request等对象取出值来赋入bean中，如果不用MVC框架的绑定功能的话,麻烦  
一 参考资料 
1 http://jc-dreaming.iteye.com/blog/563893 
2 http://www.iteye.com/topic/76043 
3 http://xubindehao.iteye.com/blog/754807 
4 http://javafenger.iteye.com/blog/96829 
5 http://www.kaila.com.cn/space.php?uid=7114&do=blog&id=458578 
6 http://blog.csdn.net/zsx923/archive/2010/01/19/5210325.aspx 
二 代码示例 

Java代码

import java.beans.IntrospectionException;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Enumeration;
import javax.servlet.http.HttpServletRequest;
import org.apache.commons.beanutils.BeanUtils;public class RequestToBean {/*** ConvertUtilsBean convertUtils = new ConvertUtilsBean();   * DateConverter dateConverter = new DateConverter();   * convertUtils.register(dateConverter,Date.class);    * *//*** @param <T>* @param newSource  现将要设置新值的对象* @param source     源数据对象*/public static <T> void  beanConvert(T newSource,T source){try {BeanUtils.copyProperties(newSource,source);} catch (IllegalAccessException e) {			e.printStackTrace();} catch (InvocationTargetException e) {			e.printStackTrace();} }/*** @param request 请求对象* @param obj     要设置Bean的类型,传入试为: Bean.class* @return*/@SuppressWarnings("unchecked")	public static <T> T getBeanToRequest(HttpServletRequest request,Class<T> clazz){  //获取页面所有的请求参数名称Enumeration<String> enume = request.getParameterNames();   T beanObj = getObjectByClass(clazz);try{   while(enume.hasMoreElements()){   //参数名称String propertyName = enume.nextElement();                //判断是否存在此属性if(isCheckBeanExitsPropertyName(clazz,propertyName)){//获取请求值Object propertyValue = request.getParameter(propertyName);setProperties(beanObj,propertyName,propertyValue);}}   }catch(Exception e){}  return beanObj;   }  private static <T> T getObjectByClass(Class<T> clazz){T t = null;try {t = clazz.newInstance();} catch (InstantiationException e1) {			e1.printStackTrace();} catch (IllegalAccessException e1) {			e1.printStackTrace();}return t;}/*** @param clazz           Class对象* @param propertyName    属性名称* @return true || false  检查对象中是否存在该属性名称*/private  static boolean isCheckBeanExitsPropertyName(Class<?> clazz,String propertyName){	boolean retValue = false;try {Field field =  clazz.getDeclaredField(propertyName);			if(null != field){retValue = true;}} catch (NoSuchFieldException e) {			Out.println("类: " + clazz.getSimpleName()+",不存在属性名: "+propertyName+" ,详细错误信息: "+e.getMessage());		}return retValue;}/**  * 设置字段值      * @param obj          实例对象  * @param propertyName 属性名  * @param value        新的字段值  * @return            */   public static void setProperties(Object object, String propertyName,Object value) throws IntrospectionException,   IllegalAccessException, InvocationTargetException {   PropertyDescriptor pd = new PropertyDescriptor(propertyName,object.getClass());   Method methodSet = pd.getWriteMethod();   methodSet.invoke(object,value);   }         
}

三 使用common beanutils组件 
代码: 
User user = new User(); 
BeanUtils.populate(user,request.getParameterMap());