1、创建javabean类并在构造函数中获取数据库中的用户名集合(这里我直接在构造函数中初始化用户集合,当在实际开发中使用的时候可以去数据库中取所有用户名)
1 package wck.stu.action; 2 3 import java.util.ArrayList; 4 import java.util.List; 5 6 public class TestJavabean { 7 private String name = ""; 8 9 private int age =0; 10 11 private List<String> list = new ArrayList<String>(); 12 13 public TestJavabean() { 14 this.setAge(24); 15 this.setName("wck"); 16 this.list.add("aaa"); 17 this.list.add("bbb"); 18 this.list.add("ccc"); 19 this.list.add("ddd"); 20 } 21 public String getName() { 22 return name; 23 } 24 25 public void setName(String name) { 26 this.name = name; 27 } 28 29 public int getAge() { 30 return age; 31 } 32 33 public void setAge(int age) { 34 this.age = age; 35 } 36 public List<String> getList() { 37 return list; 38 } 39 public void setList(List<String> list) { 40 this.list = list; 41 } 42 }
2、在jsp中利用struts2标签<s:bean></s:bean>创建javabean类的对象获取用户集合,并将集合转化成jsp页面的数组,在提交表单的时候循环校验用户名是否存在如果存在则提交表单,如果不存在则提示用户
1 <%@page import="java.text.SimpleDateFormat"%> 2 <%@page import="java.sql.*"%> 3 <%@ page contentType="text/html; charset=utf-8"%> 4 <%@ taglib prefix="s" uri="/struts-tags"%> 5 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 6 <html> 7 <head> 8 <s:bean name="wck.stu.action.TestJavabean" id="s"> 9 </s:bean> 10 <% 11 String path = request.getContextPath(); 12 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; 13 %> 14 <script type="text/javascript" src="<%=path%>/js/data.js"></script> 15 <script type="text/javascript"> 22 var countrylist = new Array(); 23 countrylist = '<s:property value="#s.list"/>'.replace('[','').replace(']','').split(','); 24 function validation() { 25 var index = ""; 26 for ( var i = 0; i < countrylist.length; i++) { 27 if(countrylist[i]==document.getElementById("nameId").value) { 28 index="success"; 29 } 30 } 31 if(index=="") { 32 alert("用户名不存在!"); 33 }else { 34 document.getElementById("formId").action=testStrutsLabel/testOne.action; 35 document.getElementById("formId").submit; 36 } 37 } 38 </script> 39 </head> 40 <body> 41 <s:form id="formId"> 42 <s:combobox list="#{'2':'aa','3':'bb'}" label="测试选择" name="testChoose" headerValue="--请选择--" headerKey="1" readonly="false"/><br> 44 <s:doubleselect doubleList="top=='颜色'?{'红色','黄色','蓝色'}:{'苹果','香蕉','梨'}" list="{'颜色','水果'}" doubleName="第二选项" label="第一选项" headerValue="--请选择--" headerKey="1"/> 45 <s:radio list="{'男','女'}" label="性别" name="sex"></s:radio><br> 48 <s:actionerror/> 49 <s:actionmessage/> 50 <s:textfield name="name" id="nameId" label="用户名"></s:textfield> 51 <s:submit type="button" label="提交" onclick="validation()"></s:submit> 52 </s:form> 53 <s:property value="#s.age"/> 54 <s:property value="#s.list"/> 55 </body> 56 </html>