很实用的工具类WebUtils，把request to javabean

 

这个类的功能是把request里面的数据，封装到指定的javabean，需要导入BeanUtils工具包

 

下面的是html里面的属性

 

 <form action="/day8/servlet/Request2Bean" method="post">
  <table>
       <tr><td>用户名</td><td><input type="text" name="name"></td></tr> 
         <tr><td>年龄</td><td><input type="text" name="password"></td></tr>
           <tr><td>生日</td><td><input type="text" name="date"></td></tr>
           </table>
           <input type="submit" value="提交">
          </form>

 

 封装数据的javabean，User类

 

package com.itcast.javabean;

import java.util.Date;

public class User {
	private String name;
	private int age;
	private Date date;

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public int getAge() {
		return age;
	}

	public void setAge(int age) {
		this.age = age;
	}

	public Date getDate() {
		return date;
	}

	public void setDate(Date date) {
		this.date = date;
	}

	@Override
	public String toString() {
		return "User [age=" + age + ", date=" + date + ", name=" + name + "]";
	}

}

 

把request数据装到javabean中的工具类

 

package com.itcast.utils;

import java.util.Date;
import java.util.Enumeration;

import javax.servlet.http.HttpServletRequest;

import org.apache.commons.beanutils.BeanUtils;
import org.apache.commons.beanutils.ConvertUtils;
import org.apache.commons.beanutils.converters.DateConverter;

public class WebUtils {
	public static <T> T Requst2Bean(HttpServletRequest request, Class<T> bean) {
		T t = null;
		try {
			t = bean.newInstance();
			Enumeration parameterNames = request.getParameterNames();
			DateConverter convert = new DateConverter();//写一个日期转换器
			String[] patterns = { "yyyyMMdd", "yyyy-MM-dd" };//限定日期的格式字符串数组
			convert.setPatterns(patterns);
			ConvertUtils.register(convert, Date.class);
			while (parameterNames.hasMoreElements()) {
				String name = (String) parameterNames.nextElement();
				String value = request.getParameter(name);

				BeanUtils.setProperty(t, name, value);//使用BeanUtils来设置对象属性的值

			}
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return t;

	}
}