在添加数据的时候有时因为数据条件不符合而页面的数据要重新输入比较麻烦，所以要做数据回显功能
根据提供domain里的基本数据类写个类CustomerFormBean .java
1 package cn.itcast.Controller; 2 3 import java.util.Date; 4 import java.util.HashMap; 5 import java.util.Map; 6 7 public class CustomerFormBean { 8 private String id; 9 public String getId() { 10 return id; 11 } 12 public void setId(String id) { 13 this.id = id; 14 } 15 private String name; 16 private String gender;// 1男 0女 17 private String birthday; 18 private String cellphone; 19 private String email; 20 private String []hobbies;// 足球,篮球,乒乓球 21 private String type;//VIP 普通客户 22 private String description; 23 Map<String,String> errors=new HashMap<String,String>(); 24 public String getName() { 25 return name; 26 } 27 public void setName(String name) { 28 this.name = name; 29 } 30 public String getGender() { 31 return gender; 32 } 33 public void setGender(String gender) { 34 this.gender = gender; 35 } 36 public String getBirthday() { 37 return birthday; 38 } 39 public void setBirthday(String birthday) { 40 this.birthday = birthday; 41 } 42 public String getCellphone() { 43 return cellphone; 44 } 45 public void setCellphone(String cellphone) { 46 this.cellphone = cellphone; 47 } 48 public String getEmail() { 49 return email; 50 } 51 public void setEmail(String email) { 52 this.email = email; 53 } 54 public String[] getHobbies() { 55 return hobbies; 56 } 57 public void setHobbies(String[] hobbies) { 58 this.hobbies = hobbies; 59 } 60 public String getType() { 61 return type; 62 } 63 public void setType(String type) { 64 this.type = type; 65 } 66 public String getDescription() { 67 return description; 68 } 69 public void setDescription(String description) { 70 this.description = description; 71 } 72 73 public Map<String, String> getErrors() { 74 return errors; 75 } 76 public boolean validate() 77 { 78 if(null==birthday||"".equals(birthday)) 79 { 80 errors.put("birthday", "请输入生日数据"); 81 return false; 82 } 83 return true; 84 } 85 }
1 request.setCharacterEncoding("utf-8"); 2 CustomerFormBean formBean=new CustomerFormBean(); 3 try { 4 BeanUtils.populate(formBean,request.getParameterMap()); //装载数据到formbean实例上 5 if(false==formBean.validate()) //数据验证不通过 6 { 7 request.setAttribute("formBean", formBean); //用于数据回显 在jsp页面上 回显 8 request.getRequestDispatcher("/WEB-INF/jsp/addCustomer.jsp").forward(request, response); 9 return; 10 } 11 } catch (Exception e) { 12 e.printStackTrace(); 13 }
jsp页面
1 <%@ page language="java" contentType="text/html; charset=utf-8" 2 pageEncoding="utf-8"%> 3 <%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn"%> 4 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 5 <html> 6 <head> 7 <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> 8 <title>Insert title here</title> 9 </head> 10 <body> 11 <form action="${pageContext.request.contextPath}/AddCustomerServlet" 12 method="post"> 13 <table align="center" cellpadding="5" border="4"> 14 <tr> 15 <th>姓名</th> 16 <td><input type="text" name="name" value="${formBean.name }"/></td> 17 </tr> 18 <tr> 19 <th>性别</th> 20 <td><input type="radio" name="gender" value='0' ${formBean.gender==0? 'checked="checked"':''} />男 21 <input 22 type="radio" name="gender" value='1' ${formBean.gender==1? 'checked="checked"':''}/>女</td> 23 </tr> 24 <tr> 25 <th>生日</th> 26 <td><input type="text" name="birthday" value ="${formBean.birthday }"/>${formBean.errors.birthday}</td> 27 </tr> 28 <tr> 29 <th>电话</th> 30 <td><input type="text" name="cellphone" value ="${formBean.cellphone }"/></td> 31 </tr> 32 <tr> 33 <th>email</th> 34 <td><input type="text" name="email" value ="${formBean.email }"/></td> 35 </tr> 36 <tr> 37 <th>爱好</th> 38 <td><input type="checkbox" name="hobbies" value="游泳" ${fn:contains(requestScope.formBean.hobbies,'游泳')?'checked="checked"':''}/>游泳 <input 39 type="checkbox" name="hobbies" value="看戏" ${fn:contains(requestScope.formBean.hobbies,'看戏')?'checked="checked"':''}/>看戏 <input 40 type="checkbox" name="hobbies" value="耍斗" ${fn:contains(requestScope.formBean.hobbies,'耍斗')?'checked="checked"':''}/>耍斗</td> 41 </tr> 42 <tr> 43 <th>类型</th> 44 <td><input type="text" name="type" /></td> 45 </tr> 46 <tr> 47 <th>描述</th> 48 <td><textarea rows="4" cols="20" name="description" value="${formBean.description}"> </textarea> 49 </td> 50 </tr> 51 <tr align="center"> 52 <td colspan="2"><input type="submit" value="添加" /></td> 53 </tr> 54 55 </table> 56 </form> 57 </body> 58 </html>