JSP页面显示这样：
JSP代码：
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ include file="../base.jsp"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>新闻类型列表</title>
<style type="text/css">
body{
background-image: url("images/bg_newsDetailList1.jpg");
background-position:-100px -300px;
}
.enableStyle{
background-color: ;
color:black;
}
.disableStyle{
background-color: red;
color: white;
}
</style>
<script type="text/javascript">
function checkSelected(){
var flag=false;
var ids=document.getElementsByName("ids");
for(var i=0;i<ids.length;i++){
if(ids[i].checked){
flag=true;
break;
}
}
if(!flag){
alert("请选择需要删除的数据！");
}else{
if(confirm("确定要删除选中的数据吗？")){
document.myform.submit();
}
}
}
</script>
</head>
<body>
<form name="myform" method="post" action="newstypeservlet?op=batchDelete">
<table border="1">
<tr>
<th>编号</th>
<th>类型名</th>
<th>编辑</th>
<th>删除</th>
</tr>
<c:forEach items="${requestScope.newsTypeList }" var="newsType" varStatus="status">
<tr style="background-color: ${status.index%2==0?'red':'green' } ">
<td>
<input type="checkbox" name="ids" value="${newsType.id }"/>
${newsType.id }
</td>
<td>${newsType.typeName }</td>
<td><a href="newstypeservlet?op=toEdit&id=${newsType.id }">编辑</a></td>
<td><a href="newstypeservlet?op=delete&id=${newsType.id }">删除</a></td>
</tr>
</c:forEach>
<tr>
<td colspan="4" >
<input type="button" value="批量删除" onclick="checkSelected()"/>
</td>
</tr>
</table>
</form>
</body>
</html>
其中base.jsp代码如下：
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<base href="<%=basePath %>" />
Servlet代码：
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
// System.out.println("进入sevlet");
request.setCharacterEncoding("UTF-8");// 解决Post提交时的乱码问题
String op = request.getParameter("op");// 注意：此处的JSP页面不放在根目录下，Servlet就无法接收到页面传来的数据，因为web.xml配置信息无法覆盖
if ("add".equals(op)) {
addNewsType(request, response);
} else if ("list".equals(op)) {
listNewsType(request, response);
} else if ("batchDelete".equals(op)) {
batchDelete(request, response);
} else if ("delete".equals(op)) {
deleteById(request, response);
}
}
// 新闻列表
private void listNewsType(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
NewsTypeService newsTypeService = new NewsTypeService();
List<NewsType> newsTypeList = newsTypeService.findAll();
request.setAttribute("newsTypeList", newsTypeList);
request.getRequestDispatcher("../listNewsType.jsp").forward(request,
response);
}
private void deleteById(HttpServletRequest request,
HttpServletResponse response) throws IOException, ServletException {
PrintWriter out = response.getWriter();
String idStr = request.getParameter("id");
if (idStr == null || "".equals(idStr)) {
out.write("<script>alert('密码不能为空');history.back();</script>");
return;
}
int id = Integer.parseInt(idStr);
NewsTypeService newsTypeService = new NewsTypeService();
newsTypeService.delete(id);
// 删除数据后，返回列表
listNewsType(request, response);
}
private void batchDelete(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
String[] ids = request.getParameterValues("ids");
NewsTypeService newsTypeService = new NewsTypeService();
newsTypeService.batchDelete(ids); // 删除数据后，返回列表
listNewsType(request, response);
}
service代码：
package com.syf.service;
import java.util.List;
import com.syf.dao.NewsTypeDao;
import com.syf.entity.NewsType;
public class NewsTypeService {
public int save(NewsType newsType) {
return new NewsTypeDao().save(newsType);
}
public int batchDelete(String[] ids) {
return new NewsTypeDao().batchDelete(ids);
}
public List<NewsType> findAll() {
return new NewsTypeDao().findAll();
}
public int delete(int id) {
return new NewsTypeDao().delete(id);
}
}
DAO层代码：
package com.syf.dao;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import com.syf.entity.NewsType;
import com.syf.util.ArrayUtil;
import com.syf.util.DBUtil;
public class NewsTypeDao {
DBUtil dbUtil = new DBUtil();
// 保存新闻类型
public int save(NewsType newsType) {
String sql = "insert into newstype(typeName) values (?)";
Object[] params = { newsType.getTypeName() };
return dbUtil.executeUpdate(sql, params);
// executeUpdate的返回值是一个整数，指示受影响的行数（即更新计数）
}
public List<NewsType> findAll() {
List<NewsType> newsTypeList = new ArrayList<NewsType>();
String sql = "select * from newstype";
ResultSet rs = dbUtil.executeQuery(sql, null);
try {
while (rs.next()) {
NewsType newsType = new NewsType(rs.getInt("id"),
rs.getString("typeName"));
newsTypeList.add(newsType);// 将对象放入到集合
}
} catch (SQLException e) {
e.printStackTrace();
return newsTypeList;
} finally {
dbUtil.closeAll();
}
return newsTypeList;
}
/**
* 批量删除
*
* @param ids
* 指定的ID集合
* @return
*/
public int batchDelete(String[] ids) {
// TODO Auto-generated method stub
String sql = "delete from newstype where id in(?)";
Object[] params = { ArrayUtil.array2String(ids, ",") };
return dbUtil.executeUpdate(sql, params);
}
/**
* 根据Id进行删除
*
* @param id
* @return
*/
public int delete(int id) {
String sql = "delete from newsType where id=?";
Object[] params = { id };
return dbUtil.executeUpdate(sql, params);
}
}
entity实体类代码：
package com.syf.entity;
public class NewsType {
private int id;
private String typeName;
public NewsType() {
super();
}
public NewsType(String typeName) {
super();
this.typeName = typeName;
}
public NewsType(int id, String typeName) {
super();
this.id = id;
this.typeName = typeName;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getTypeName() {
return typeName;
}
public void setTypeName(String typeName) {
this.typeName = typeName;
}
}
