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

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 
方法一：工具类

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);   
    }         
}

方法二：

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