本文介绍了一个基于Struts框架实现的简单用户查询功能，包括JSP页面展示及后端Action类处理流程。通过SQL查询数据库判断用户是否存在，并利用Struts标签库显示查询结果。
JSP页面
<%@ page language="java" pageEncoding="gb2312"%>
<%@ taglib uri="http://struts.apache.org/tags-bean" prefix="bean" %>
<%@ taglib uri="http://struts.apache.org/tags-html" prefix="html" %>
<%@ taglib uri="http://struts.apache.org/tags-logic" prefix="logic" %>
<%@ taglib uri="http://struts.apache.org/tags-tiles" prefix="tiles" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html:html lang="true">
<head>
<html:base />
<title>userResult.jsp</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
<logic:present name="result" scope="request">
<h1>该用户存在</h1>说明：name="result"中result与Action类中的request.setAttribute("result", flag);对应
</logic:present>
<logic:present name="null" scope="request">
<h1>该用户不存在</h1>
</logic:present>
</body>
</html:html>
Action类
package bao.action;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.Collection;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import bao.form.SecletOneForm;
import bao.omygod.a;
publicclass UserSelectAction extends Action {
public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response) {
SecletOneForm secletOneForm = (SecletOneForm) form; a a = new a();
String id = secletOneForm.getId();
String sql = "select * from userinfo where userid = '"+id+"'";
int flag = a.executeUpdate(sql);
System.out.println("flag = " + flag);
if(flag == 0){
request.setAttribute("null", flag);
}else{
request.setAttribute("result", flag);
}
return mapping.findForward("show");
}
}
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