request2bean

package cn.itcast.utils;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Map;
import java.util.UUID;

import javax.servlet.http.HttpServletRequest;

import org.apache.commons.beanutils.BeanUtils;
import org.apache.commons.beanutils.ConvertUtils;
import org.apache.commons.beanutils.Converter;

public class WebUtils {

public static <T> T request2Bean(HttpServletRequest request,Class<T>  beanClass){
try{
T bean = beanClass.newInstance();
//得到request里面所有数据
Map map = request.getParameterMap();
//map{name=aa,password=bb,birthday=1990-09-09}  bean(name=aa,password=dd,birthday=Date)

ConvertUtils.register(new Converter(){

public Object convert(Class type, Object value) {
if(value==null){
return null;
}
String str = (String) value;
if(str.trim().equals("")){
return null;
}

SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
try {
return df.parse(str);
} catch (ParseException e) {
throw new RuntimeException(e);
}
}
}, Date.class);
BeanUtils.populate(bean, map);
return bean;
}catch (Exception e) {
throw new RuntimeException(e);
}
}

public static String generateID(){
return UUID.randomUUID().toString();
}

}