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BeanUtils入门

發(fā)布時(shí)間：2025/3/21 编程问答 28 豆豆

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BeanUtils入門

基本概述

BeanUtils 是 Apache commons組件的成員之一，主要用于簡化JavaBean封裝數(shù)據(jù)的操作。它可以給JavaBean封裝一個(gè)字符串?dāng)?shù)據(jù)，也可以將一個(gè)表單提交的所有數(shù)據(jù)封裝到JavaBean中。

PS：下載地址：https://github.com/apache/commons-beanutils/

常用API

BeanUtils工具常用工具類有兩個(gè)：BeanUtils、ConvertUtils。BeanUtils用于封裝數(shù)據(jù)，ConvertUtils用于處理類型轉(zhuǎn)換，常用API如下：

null 方法描述

BeanUtils對象	populate(Object bean, Map<String,String[]> properties)	將Map數(shù)據(jù)封裝到指定Javabean中，一般用于將表單的所有數(shù)據(jù)封裝到j(luò)avabean
ConvertUtils	register(Converter converter, Class clazz)	注冊類型轉(zhuǎn)換器

封裝表單提交基本步驟

創(chuàng)建JavaBean

package com.pc.domain;import java.util.Date;/*** 用戶Bean* * @author Switch* @data 2016年10月11日* @version V1.0*/ public class User {private Integer id;private String userName;private String password;private String sex;private String hobby;private Date birthday;// 無參構(gòu)造方法public User() {}// 設(shè)置器和獲取器public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public String getUserName() {return userName;}public void setUserName(String userName) {this.userName = userName;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}public String getSex() {return sex;}public void setSex(String sex) {this.sex = sex;}public String getHobby() {return hobby;}public void setHobby(String hobby) {this.hobby = hobby;}public Date getBirthday() {return birthday;}public void setBirthday(Date birthday) {this.birthday = birthday;}@Overridepublic String toString() {return "User [id=" + id + ", userName=" + userName + ", password=" + password + ", sex=" + sex + ", hobby="+ hobby + ", birthday=" + birthday + "]";}}

Servlet獲取表單數(shù)據(jù)

表單

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html> <html><head><meta charset=UTF-8"><title>注冊頁面2</title></head><body><div align="center" style="position: relative; top: 100px;"><form action="TestBeanServlet" method="post">用戶名：<input type="text" name="userName" /><br />密碼：<input type="password" name="password" /><br />性別：<input type="radio" name="sex" value="男" />男<input type="radio" name="usex" value="女" />女<br />愛好：<input type="checkbox" name="hobby" value="蹦迪" />蹦迪<input type="checkbox" name="hobby" value="攀巖" />攀巖<input type="checkbox" name="hobby" value="蹦極" />蹦極<br />生日：<input type="text" name="birthday" /><br/><input type="submit" value="注冊" /></form></div></body> </html>

獲取表單數(shù)據(jù)

package com.pc.beanutils;import java.io.IOException; import java.util.Map;import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse;/*** 測試BeanUtils工具* * @author Switch* @data 2016年10月11日* @version V1.0*/ public class TestBeanServlet extends HttpServlet {public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {response.setContentType("text/html;charset=utf-8");request.setCharacterEncoding("utf-8");// 獲取表單數(shù)據(jù)集Map<String, String[]> formMap = request.getParameterMap();}public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {doGet(request, response);} }

編寫工具類

package com.pc.utils;import java.util.Date; import java.util.Map;import org.apache.commons.beanutils.BeanUtils; import org.apache.commons.beanutils.ConvertUtils; import org.apache.commons.beanutils.converters.DateConverter;/*** Bean封裝工具類* * @author Switch* @data 2016年10月11日* @version V1.0*/ public class MyBeanUtils {public static <T> T populate(Class<T> beanClass, Map<String, String[]> props) throws Exception {// 使用反射創(chuàng)建實(shí)例T bean = beanClass.newInstance();// 創(chuàng)建BeanUtils提供的時(shí)間轉(zhuǎn)換器DateConverter dateConverter = new DateConverter();// 設(shè)置轉(zhuǎn)換格式dateConverter.setPatterns(new String[] { "yyyy-MM-dd", "yyyy/MM/dd", "yyyyMMdd" });// 注冊轉(zhuǎn)換器ConvertUtils.register(dateConverter, Date.class);// 封裝數(shù)據(jù)BeanUtils.populate(bean, props);return bean;} }

測試轉(zhuǎn)換工具

package com.pc.beanutils;import java.io.IOException; import java.util.Arrays; import java.util.Map;import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse;import com.pc.domain.User; import com.pc.utils.MyBeanUtils;/*** 測試BeanUtils工具* * @author Switch* @data 2016年10月11日* @version V1.0*/ public class TestBeanServlet extends HttpServlet {public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {try {response.setContentType("text/html;charset=utf-8");request.setCharacterEncoding("utf-8");// 獲取表單數(shù)據(jù)集Map<String, String[]> formMap = request.getParameterMap();// 封裝數(shù)據(jù)User user = MyBeanUtils.populate(User.class, formMap);// 處理特殊數(shù)據(jù)類型String[] hobbies = request.getParameterValues("hobby");// 將其轉(zhuǎn)換為hobby1,hobby2,hobby3這樣的StringString hobby = Arrays.toString(hobbies).substring(1, Arrays.toString(hobbies).length() - 1);user.setHobby(hobby);System.out.println(user);} catch (Exception e) {e.printStackTrace();}}public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {doGet(request, response);} }

測試

PS：GitHub：https://github.com/Switch-vov/servlet-request-test

from:?http://blog.csdn.net/q547550831/article/details/52791671

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