javaEE BeanUtils, 将用户的参数映射封装成一个JavaBean对象。ConvertUtils, 手动对参数进行类型转换

BeanUtils工具包下载(Jar包)：https://pan.baidu.com/s/1h9Yi4pbNhYbRnLaF0Y8BtQ  密码：6kth

commons-beanutils-1.8.3.jar 和 commons-logging-1.1.1.jar包----Build Path----Add To Build Path

参考： https://blog.csdn.net/houyanhua1/article/details/80866625

RegisterServlet.java：

package com.xxx.web.servlet;

import java.io.IOException;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Map;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

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

import com.xxx.domain.User;

public class RegisterServlet extends HttpServlet {

	protected void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {
		
		request.setCharacterEncoding("UTF-8");
		
		//获得表单数据
		Map<String, String[]> properties = request.getParameterMap();
		User user = new User();
		try {
			//自己指定一个类型转换器（将String转成Date）。 在映射封装成JavaBean对象时,会自动根据该规则进行类型转换。
			ConvertUtils.register(new Converter() {
				@Override
				public Object convert(Class clazz, Object value) {
					//将string转成date
					SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
					Date parse = null;
					try {
						parse = format.parse(value.toString());
					} catch (ParseException e) {
						e.printStackTrace();
					}
					return parse;
				}
			}, Date.class);
			// 根据用户的参数映射封装成JavaBean对象。
			BeanUtils.populate(user, properties);  
		} catch (Exception e) {
			e.printStackTrace();
		}

	}

	protected void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {
		doGet(request, response);
	}
}