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Jsp/Servlet根据请求参数自动填充Java对象:表单Bean
(1)问题的引出:
为了简单方便我们需要一种可以一次性全部提交表单数据的技术,也就是要说的:Bean表单
(2)BeanUtilities代码如下:
package com.lc.ch04Biaodanshuju; import java.util.*; import javax.servlet.http.*; import org.apache.commons.beanutils.BeanUtils; public class BeanUtilities { public static void populateBean(Object formBean, HttpServletRequest request) { populateBean(formBean, request.getParameterMap()); } public static void populateBean(Object bean, Map propertyMap) { try { BeanUtils.populate(bean, propertyMap); } catch(Exception e) { // Empty catch. The two possible exceptions are // java.lang.IllegalAccessException and // java.lang.reflect.InvocationTargetException. // In both cases, just skip the bean operation. } } }
package com.lc.ch04Biaodanshuju; import java.io.IOException; import java.io.PrintWriter; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class SubmitInsuranceInfo extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { InsuranceInfo info = new InsuranceInfo(); BeanUtilities.populateBean(info, request); response.setContentType("text/html"); PrintWriter out = response.getWriter(); String docType = "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0 " + "Transitional//EN\">\n"; String title = "Insurance Info for " + info.getName(); out.println(docType + "<HTML>\n" + "<HEAD><TITLE>" + title + "</TITLE></HEAD>\n" + "<BODY BGCOLOR=\"#FDF5E6\">\n" + "<CENTER>\n" + "<H1>" + title + "</H1>\n" + "<UL>\n" + " <LI>Employee ID: " + info.getEmployeeID() + "\n" + " <LI>Number of children: " + info.getNumChildren() + "\n" + " <LI>Married?: " + info.isMarried() + "\n" + "</UL></CENTER></BODY></HTML>"); } }
(4)连接数据库的javabean
package com.lc.ch04Biaodanshuju; public class InsuranceInfo { private String name = "No name specified"; private String employeeID = "No ID specified"; private int numChildren = 0; private boolean isMarried = false; public String getName() { return(name); } public void setName(String name) { this.name = ServletUtilities.filter(name); } public String getEmployeeID() { return(employeeID); } public void setEmployeeID(String employeeID) { this.employeeID = ServletUtilities.filter(employeeID); } public int getNumChildren() { return(numChildren); } public void setNumChildren(int numChildren) { this.numChildren = numChildren; } public boolean isMarried() { return(isMarried); } public void setMarried(boolean isMarried) { this.isMarried = isMarried; } }
(5)
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD><TITLE>Employee Insurance Signup</TITLE></HEAD> <BODY BGCOLOR="#FDF5E6"> <CENTER> <H1>Employee Insurance Signup</H1> <FORM ACTION="/servlet/coreservlets.SubmitInsuranceInfo"> Name: <INPUT TYPE="TEXT" NAME="name"><BR> Employee ID: <INPUT TYPE="TEXT" NAME="employeeID"><BR> Number of Children: <INPUT TYPE="TEXT" NAME="numChildren"><BR> <INPUT TYPE="CHECKBOX" NAME="married" VALUE=http://www.mamicode.com/"true">Married?
>
(6)jar包的获取与使用:我们要使用工具类 必学的jar包,下载地址:http://download.csdn.net/detail/u010870518/7867181 别忘了添加配置!
Jsp/Servlet根据请求参数自动填充Java对象:表单Bean
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