jsp 条件查询、列表分页
条件查询
dao
//根据搜索条件筛选数据
public List<User> GetUserBySearch(String userName, String sex) throws SQLException {
String sql = "select * from User where 1=1 ";
List<String> params = new ArrayList<String>();
if (userName != null && userName != "") {
sql += " and UserName like ?";
params.add("%"+userName+"%");
}
if (sex != null && sex != "") {
sql += " and sex = ?";
params.add(sex);
}
QueryRunner qr = new QueryRunner(DBUtil.GetDataSource());
List<User> users = qr.query(sql, new BeanListHandler<User>(User.class), params.toArray());
return users;
}
service
public List<User> GetUserBySearch(String userName,String sex) throws SQLException {
UserDao dao = new UserDao();
return dao.GetUserBySearch(userName,sex);
}
userList servlet
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String userName = request.getParameter("userName");
String sex = request.getParameter("sex");
UserService service = new UserService();
List<User> userList = null;
try {
//userList = service.GetAllService();
userList = service.GetUserBySearch(userName,sex);
} catch (SQLException e) {
e.printStackTrace();
}
request.setAttribute("userName",userName);
request.setAttribute("sex",sex);
request.setAttribute("userList", userList);
request.getRequestDispatcher("userList.jsp").forward(request,response);
}
userList.jsp
<%@ page import="com.david.domain.User" %>
<%@ page import="java.util.List" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>用户列表</title>
</head>
<body>
<div>
按用户名称搜索：<input id="txtUserName" value="${userName}">
按用户性别查找：<select id="selSex">
<option value="">全部</option>
<option value="男">男</option>
<option value="女">女</option>
</select>
<button type="button" onclick="search()">搜索</button>
</div>
<script>
//设置默认值
window.onload = function (){
for(var i = 0;i<document.getElementById("selSex").options.length;i++){
var option = document.getElementById("selSex").options[i];
if(option.value == "${sex}"){
option.selected = true;
}
}
} function search(){
var userName = document.getElementById("txtUserName").value;
var sex = "";
for(var i = 0;i<document.getElementById("selSex").options.length;i++){
if(document.getElementById("selSex").options[i].selected){
sex = document.getElementById("selSex").options[i].value;
}
}
location.href='userList?userName='+userName+"&sex="+sex;
}
</script>
<table>
<tr>
<th>用户ID</th>
<th>用户名</th>
<th>用户密码</th>
<th>用户年龄</th>
<th>用户性别</th>
<th>操作</th>
</tr>
<%
if (request.getAttribute("userList") != null) {
%>
<%for (User u : (List<User>) request.getAttribute("userList")) {%>
<tr>
<td><%=u.getUserId()%>
</td>
<td><%=u.getUserName()%>
</td>
<td><%=u.getPassWord()%>
</td>
<td><%=u.getAge()%>
</td>
<td><%=u.getSex()%>
</td>
<td>
<a href="GetUserById?userId=<%=u.getUserId()%>">修改</a>
<a href="DeleteUser?userId=<%=u.getUserId()%>">删除</a>
</td>
</tr>
<%}%>
<%}%>
</table>
<a href="AddUser.jsp">添加用户</a>
</body>
</html>
列表分页
在domain中创建pageBean实体
package com.david.domain;
import java.util.List;
public class PageBean<T> {
//当前页
private int curPage;
//当前显示条数
private int pageSize;
//总页数
private int totalPage;
//总条数
private int totalCount;
//展示的数据
private List<T> Data;
public int getCurPage() {
return curPage;
}
public int getPageSize() {
return pageSize;
}
public int getTotalPage() {
return totalPage;
}
public int getTotalCount() {
return totalCount;
}
public List<T> getData() {
return Data;
}
public void setCurPage(int curPage) {
this.curPage = curPage;
}
public void setPageSize(int pageSize) {
this.pageSize = pageSize;
}
public void setTotalPage(int totalPage) {
this.totalPage = totalPage;
}
public void setTotalCount(int totalCount) {
this.totalCount = totalCount;
}
public void setData(List<T> data) {
Data = data;
}
}
在dao中 创建分页方法
//获取总条数
public int GetUserCount(String userName, String sex) throws SQLException {
String sql = "select count(*) from User where 1=1 ";
List<String> params = new ArrayList<String>();
if (userName != null && userName != "") {
sql += " and UserName like ?";
params.add("%" + userName + "%");
}
if (sex != null && sex != "") {
sql += " and sex = ?";
params.add(sex);
}
QueryRunner qr = new QueryRunner(DBUtil.GetDataSource());
long count = (long)qr.query(sql,new ScalarHandler(),params.toArray());
return (int)count;
} public List<User> GetUserListForPageBean(String userName, String sex, int page, int pageSize) throws SQLException {
String sql = "select * from User where 1=1 ";
List<Object> params = new ArrayList<Object>();
if (userName != null && userName != "") {
sql += " and UserName like ?";
params.add("%" + userName + "%");
}
if (sex != null && sex != "") {
sql += " and sex = ?";
params.add(sex);
}
sql += " limit ?,?";
page = (page - 1) * pageSize;
params.add(page);
params.add(pageSize); QueryRunner qr = new QueryRunner(DBUtil.GetDataSource());
List<User> users = qr.query(sql, new BeanListHandler<User>(User.class), params.toArray());
return users;
}
service
public PageBean<User> GetUserListForPageBean(String userName, String sex, int page, int pageSize) throws SQLException {
UserDao dao = new UserDao();
PageBean pageBean = new PageBean();
pageBean.setCurPage(page);
pageBean.setPageSize(pageSize);
int totalCount = dao.GetUserCount(userName, sex);
pageBean.setTotalCount(totalCount);
int totalPage = (int) Math.ceil(1.0 * totalCount / pageSize);
pageBean.setTotalPage(totalPage);
List<User> data = dao.GetUserListForPageBean(userName,sex,page,pageSize);
pageBean.setData(data);
return pageBean;
}
UserListForPage servlet
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String userName = request.getParameter("userName");
String sex = request.getParameter("sex");
String page = request.getParameter("page");
int curPage = 1;
if(page != null && page != ""){
curPage = Integer.parseInt(page);
}
int pageSize = 5;
UserService service = new UserService();
PageBean<User> pageBean = null;
try {
pageBean = service.GetUserListForPageBean(userName,sex,curPage,pageSize);
} catch (SQLException e) {
e.printStackTrace();
}
request.setAttribute("userName",userName);
request.setAttribute("sex",sex);
request.setAttribute("pageBean", pageBean);
request.getRequestDispatcher("userListForPage.jsp").forward(request,response);
}
web.xml
<servlet>
<servlet-name>UserListForPage</servlet-name>
<servlet-class>com.david.web.UserListForPage</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>UserListForPage</servlet-name>
<url-pattern>/userListForPage</url-pattern>
</servlet-mapping>
userListForPage.jsp
<%@ page import="com.david.domain.User" %>
<%@ page import="java.util.List" %>
<%@ page import="com.david.domain.PageBean" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>用户列表</title>
</head>
<body>
<div>
按用户名称搜索：<input id="txtUserName" value="${userName}">
按用户性别查找：<select id="selSex">
<option value="">全部</option>
<option value="男">男</option>
<option value="女">女</option>
</select>
<button type="button" onclick="search()">搜索</button>
<a href="AddUser.jsp">添加用户</a>
</div>
<script>
//设置默认值
window.onload = function (){
for(var i = 0;i<document.getElementById("selSex").options.length;i++){
var option = document.getElementById("selSex").options[i];
if(option.value == "${sex}"){
option.selected = true;
}
}
} function search(){
var userName = document.getElementById("txtUserName").value;
var sex = "";
for(var i = 0;i<document.getElementById("selSex").options.length;i++){
if(document.getElementById("selSex").options[i].selected){
sex = document.getElementById("selSex").options[i].value;
}
}
location.href='userList?userName='+userName+"&sex="+sex;
}
</script>
<table>
<tr>
<th>用户ID</th>
<th>用户名</th>
<th>用户密码</th>
<th>用户年龄</th>
<th>用户性别</th>
<th>操作</th>
</tr>
<%
PageBean pageBean = (PageBean)request.getAttribute("pageBean");
if (pageBean != null && pageBean.getData() != null) {
%>
<%for (User u : (List<User>)pageBean.getData()) {%>
<tr>
<td><%=u.getUserId()%>
</td>
<td><%=u.getUserName()%>
</td>
<td><%=u.getPassWord()%>
</td>
<td><%=u.getAge()%>
</td>
<td><%=u.getSex()%>
</td>
<td>
<a href="GetUserById?userId=<%=u.getUserId()%>">修改</a>
<a href="DeleteUser?userId=<%=u.getUserId()%>">删除</a>
</td>
</tr>
<%}%>
<%}%>
</table>
<div class="page">
<%if(pageBean.getCurPage() != 1){%>
<a href="?page=1">首页</a>
<a href="?page=<%=pageBean.getCurPage()-1%>">上一页</a>
<%}%> <%for(int i = 1;i<=pageBean.getTotalPage();i++){
%>
<%if(pageBean.getCurPage() == i){%>
<a href="?page=<%=i%>" class="currentPage"><%=i%></a>
<%}else{%>
<a href="?page=<%=i%>"><%=i%></a>
<%}%>
<%}%>
<%if(pageBean.getCurPage() != pageBean.getTotalPage()){%>
<a href="?page=<%=pageBean.getCurPage()+1%>">下一页</a>
<a href="?page=<%=pageBean.getTotalPage()%>">尾页</a>
<%}%>
共<%=pageBean.getTotalCount()%>条数据，<%=pageBean.getTotalPage()%>页。
</div>
<style>
.page a{
font-size:12px;
text-decoration: none;
color:#ccc;
}
.page .currentPage{
color:#000;
font-size:20px;
}
</style>
</body>
</html>
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