web组件工具之获取表单数据：webUtils
本文需要的架包:commons-beanutils-1.8.3.jar、commons-logging-1.1.3.jar、servlet-api.jar。
本文共分为五部分：1）封装通用工具类：从表单接收数据并封装到实体类中；2）绘制jsp页面：传输数据； 3）创建实体类：用来存放表单数据； 4）创建servlet类：调用工具类，实现数据封装; 5) 配置web.xml文件
注意：1）本工具类也同样适用于action；
2）jsp中的表单名称与实体类中的属性名称必须一致。
1.封装通用工具类（WebUtils.java）
package com.BlueStar.util; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Date; 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 getData(HttpServletRequest req,Class<T> clazz){ // convert Date start ConvertUtils.register(new Converter() { @Override public Object convert(Class type, Object value) { //filter if(type != Date.class) return null; if(value == null || "".equals(value.toString().trim())) return null; //convert SimpleDateFormat format = new SimpleDateFormat("yyyy/MM/dd"); Date date = null; try { date = format.parse(value.toString()); } catch (ParseException e) { // TODO Auto-generated catch block e.printStackTrace(); } return date; } }, Date.class); // convert Date end T t = null; try { //newInstance t = clazz.newInstance(); //set value from jsp BeanUtils.populate(t, req.getParameterMap()); } catch (Exception e) { e.printStackTrace(); } return t; } }
2. 绘制jsp页面（userInfo.jsp）
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <title>Insert title here</title> </head> <body> <form action="info" method="post"> 姓名：<input type="text" name="userName" width="20%"/><br/><br/> 密码：<input type="password" name="password" width="20%"/><br/><br/> 生日：<input type="text" name="birthday" width="20%"/><br/><br/> <button type="submit" value="submit">submit</button> <button type="reset" value="reset">reset</button> </form> </body> </html>
3.创建实体类（UserInfoFormBean.java）
package com.BlueStar.entity; import java.util.Date; public class UserInfoFormBean { private String userName; private String password; private Date birthday; 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 Date getBirthday() { return birthday; } public void setBirthday(Date birthday) { this.birthday = birthday; } @Override public String toString() { return "UserInfoFormBean [userName=" + userName + ", password=" + password + ", birthday=" + birthday + "]"; } }
4.创建servlet（UserInfoServlet.java）
package com.BlueStar.servlet; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import com.BlueStar.entity.UserInfoFormBean; import com.BlueStar.util.WebUtils; public class UserInfoServlet extends HttpServlet{ private static final long serialVersionUID = 1L; @Override protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { UserInfoFormBean formBean = WebUtils.getData(req, UserInfoFormBean.class); System.out.println(formBean); } }
5. 配置web.xml
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0"> <display-name>library</display-name> <welcome-file-list> <welcome-file>userInfo.jsp</welcome-file> </welcome-file-list> <servlet> <servlet-name>UserInfoServlet</servlet-name> <servlet-class>com.BlueStar.servlet.UserInfoServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>UserInfoServlet</servlet-name> <url-pattern>/info</url-pattern> </servlet-mapping> </web-app>
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更多内容，请访问：http://www.cnblogs.com/BlueStarWei
