很實用的工具類WebUtils，把request to javabean（轉）

 

這個類的功能是把request里面的數據，封裝到指定的javabean，需要導入BeanUtils工具包

 

下面的是html里面的屬性

 

<form action="/day8/servlet/Request2Bean" method="post">
 <table>
      <tr><td>用戶名</td><td><input type="text" name="name"></td></tr>
        <tr><td>年齡</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>

 

 封裝數據的javabean，User類

 

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數據裝到javabean中的工具類

 

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();//寫一個日期轉換器
            String[] patterns = { "yyyyMMdd", "yyyy-MM-dd" };//限定日期的格式字符串數組
            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來設置對象屬性的值

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

    }
}