jdbc03 使用servlet实现
<%@page import="cn.bdqn.bean.News"%> <%@page import="cn.bdqn.service.impl.NewsServiceImpl"%> <%@page import="cn.bdqn.service.NewsService"%> <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <% String path = request.getContextPath(); String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/"; %> <%-- 引入需要的jstl标签库--%> <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%> <!DOCTYPE HTML> <html> <head> <base href="<%=basePath%>"> <title>My JSP 'index.jsp' starting page</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"> <style type="text/css"> <%-- 表格中的数据 居中显示 --%> td { text-align: center; } </style> </head> <%-- 需要引入了 外部javaBean --%> <jsp:useBean id="service" class="cn.bdqn.service.impl.NewsServiceImpl" /> <jsp:useBean id="pageUtil" class="cn.bdqn.util.PageUtil" /> <body> <form action="newsList.jsp" method="get"> <h1>显示新闻信息</h1> <table border="1"> <tr> <td>新闻编号</td> <td>新闻标题</td> <td>新闻作者</td> <td>创建时间</td> <td>操作</td> </tr> <% //获取分页的四要素 int pageSize = 3; //页大小 int pageIndex = 1; //当前页面 String num = request.getParameter("pageIndex");//获取pageIndex if (num != null && num != "") { //因为第一次打开页面的时候 请求中 压根没有 pageIndex的属性 pageIndex = Integer.parseInt(num); } else { pageIndex = 1; } //给通用的工具类 赋值 pageUtil.setPageIndex(pageIndex); pageUtil.setPageSize(pageSize); pageUtil.setTotalCountSize(service.getTotalCountSize()); //总记录数 pageUtil.getTotalPageCount(); //获取总页数 List<News> news = service.getNewsByPageList(pageIndex, pageSize); //把响应的数据放入作用域 request.setAttribute("news", news); request.setAttribute("pageUtil", pageUtil); %> <c:forEach items="${news}" var="n" varStatus="s"> <c:if test="${s.count%2==0}"> <tr bgcolor="green"> </c:if> <c:if test="${s.count%2!=0}"> <tr bgcolor="pink"> </c:if> <td>${n.getId()}</td> <td>${n.getTitle()}</td> <td>${n.getAuthor()}</td> <td>${n.getCreateDate()}</td> <td><a href="update.jsp?id=${n.getId()}">修改</a> </td> </tr> </c:forEach> <tr> <td>当前页：${pageUtil.getPageIndex()}</td> <td>总页数：${pageUtil.getTotalPageCount()}</td> <td>总记录数${pageUtil.getTotalCountSize()}</td> </tr> <%-- 引入需要的分页界面 --%> <c:import url="page.jsp"> <c:param name="pageIndex" value="${pageUtil.pageIndex}"></c:param> <c:param name="totalPageCount" value="${pageUtil.totalPageCount}"></c:param> </c:import> </table> </form> </body> </html>
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <%-- 引入需要的jstl标签库--%> <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <title>My JSP 'page.jsp' starting page</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> <script type="text/javascript"> function page(form,num){ //把传递来的num赋值给当前的页码 form.pageIndex.value=num; form.submit(); } </script> </head> <body> <%-- 表单隐藏域 保存 当前页--%> <input type="hidden" name="pageIndex"> <%--javaScript:伪协议 ！ 不会跳转界面，只是让我们通过这个连接直接调用JavaScript代码 --%> <tr> <c:if test="${param.pageIndex>1}"> <td><a href="javaScript:page(document.forms[0],1)">首页</a></td> <td><a href="javaScript:page(document.forms[0],${param.pageIndex-1})">上一页</a></td> </c:if> <%-- 如果当前页码小于总页数 --%> <c:if test="${param.pageIndex <param.totalPageCount}"> <td><a href="javaScript:page(document.forms[0],${param.pageIndex+1})">下一页</a> </td> <td><a href="javaScript:page(document.forms[0],${param.totalPageCount})">最后一页</a> </td> </c:if> <td><a href="addNews.jsp">新增</a></td> </tr> </body> </html>
================使用servlet==========================
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <title>新闻信息的登录界面</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> <h1>登录界面</h1> <%-- action="Login" Login必须在web.xml中又对应的url-pattern --%> <form action="Login" method="post"> <table> <tr> <td>用户名：</td> <td><input type="text" name="userName"/></td> </tr> <tr> <td>密码：</td> <td><input type="password" name="password"/></td> </tr> <tr> <td></td> <td><input type="submit" value="登录"/></td> </tr> </table> </form> </body> </html>
public class LoginServlet extends HttpServlet { //处理登录请求的servlet public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request, response); //交给 doPost（）处理请求 } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { System.out.println("进入了 LoginServlet"); request.setCharacterEncoding("utf-8"); //01.获取用户信息 String userName= request.getParameter("userName"); String password= request.getParameter("password"); User user=new User(); //把信息保存在 user中 user.setPassword(password); user.setUserName(userName); //02.从数据库取值 UserService service=new UserServiceImpl(); boolean flag= service.login(user); if(flag){ //重定向到 新闻列表servlet 如果直接到新闻界面 是没有值的！ response.sendRedirect("NewsListServlet"); }else{ //重定向到 新闻登录界面 response.sendRedirect("login.jsp"); } } }
newsList.jsp修改后的代码
<%@page import="cn.bdqn.bean.News"%> <%@page import="cn.bdqn.service.impl.NewsServiceImpl"%> <%@page import="cn.bdqn.service.NewsService"%> <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <% String path = request.getContextPath(); String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/"; %> <%-- 引入需要的jstl标签库--%> <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%> <!DOCTYPE HTML> <html> <head> <base href="<%=basePath%>"> <title>My JSP 'index.jsp' starting page</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"> <style type="text/css"> <%-- 表格中的数据 居中显示 --%> td { text-align: center; } </style> </head> <body> <form action="NewsListServlet" method="get"> <h1>显示新闻信息</h1> <table border="1"> <tr> <td>新闻编号</td> <td>新闻标题</td> <td>新闻作者</td> <td>创建时间</td> <td>操作</td> </tr> <c:forEach items="${news}" var="n" varStatus="s"> <c:if test="${s.count%2==0}"> <tr bgcolor="green"> </c:if> <c:if test="${s.count%2!=0}"> <tr bgcolor="pink"> </c:if> <td>${n.getId()}</td> <td>${n.getTitle()}</td> <td>${n.getAuthor()}</td> <td>${n.getCreateDate()}</td> <td><a href="update.jsp?id=${n.getId()}">修改</a> </td> </tr> </c:forEach> <tr> <td>当前页：${pageUtil.getPageIndex()}</td> <td>总页数：${pageUtil.getTotalPageCount()}</td> <td>总记录数${pageUtil.getTotalCountSize()}</td> </tr> <%-- 引入需要的分页界面 --%> <c:import url="page.jsp"> <c:param name="pageIndex" value="${pageUtil.pageIndex}"></c:param> <c:param name="totalPageCount" value="${pageUtil.totalPageCount}"></c:param> </c:import> </table> </form> </body> </html>
public class NewsListServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request, response); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { System.out.println("进入了 NewsListServlet"); PageUtil pageUtil=new PageUtil(); NewsService service =new NewsServiceImpl(); //获取分页的四要素 int pageSize = 3; //页大小 int pageIndex = 1; //当前页面 String num = request.getParameter("pageIndex");//获取pageIndex if (num != null && num != "") { //因为第一次打开页面的时候 请求中 压根没有 pageIndex的属性 pageIndex = Integer.parseInt(num); } else { pageIndex = 1; } //给通用的工具类 赋值 pageUtil.setPageIndex(pageIndex); pageUtil.setPageSize(pageSize); pageUtil.setTotalCountSize(service.getTotalCountSize()); //总记录数 pageUtil.getTotalPageCount(); //获取总页数 List<News> news = service.getNewsByPageList(pageIndex, pageSize); //把响应的数据放入作用域 request.setAttribute("news", news); request.setAttribute("pageUtil", pageUtil); //转发到newsList.jsp界面 request.getRequestDispatcher("/newsList.jsp").forward(request, response); } }
<?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <servlet> <servlet-name>Login</servlet-name> <servlet-class>cn.bdqn.servlet.LoginServlet</servlet-class> </servlet> <servlet> <servlet-name>NewsListServlet</servlet-name> <servlet-class>cn.bdqn.servlet.NewsListServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>Login</servlet-name> <url-pattern>/Login</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>NewsListServlet</servlet-name> <url-pattern>/NewsListServlet</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> </web-app>
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <title>新闻信息新增界面</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"> --> <%-- 引入我们需要的 富文本 编辑器 --%> <script type="text/javascript" src="ckeditor/ckeditor.js"></script> <style type="text/css"> div{ height:900px; width:900px; margin:auto; padding: auto; } </style> <script type="text/javascript"> <%--验证用户有没有选择 新闻类别 --%> function check(){ var goryId= document.getElementById("goryId").value; if(goryId==0){ alert("请选择新闻类别....."); return false; } return true; } </script> </head> <body> <div> <h1>新闻信息新增界面</h1> <%-- action="NewsAddServlet" NewsAddServlet是web.xml文件中 url-pattern --%> <form action="NewsAddServlet" enctype="multipart/form-data" method="post" onsubmit="return check()"> <table> <tr> <td>新闻分类：</td> <td> <select name="categoryId" id="goryId"> <option value="0">请选择新闻类别</option> <option value="1">国内</option> <option value="2">国际</option> <option value="3">娱乐</option> <option value="4">军事</option> <option value="5">财经</option> </select> </td> </tr> <tr> <td>新闻标题：</td> <td><input type="text" name="title"/></td> </tr> <tr> <td>新闻作者：</td> <td><input type="text" name="author"/></td> </tr> <tr> <td>新闻摘要：</td> <td><input type="text" name="summary"/></td> </tr> <tr> <td>创建时间：</td> <td><input type="date" name="createDate"/></td> </tr> <tr> <td>选择文件：</td> <td><input type="file" name="picPath"/></td> </tr> <tr> <td>新闻内容：</td> <td><textarea class="ckeditor" name="content"> </textarea> </td> </tr> <tr> <td></td> <td><input type="submit" value="新增"/></td> </tr> </table> </form> </div> </body> </html>
public class NewsAddServlet extends HttpServlet { // 新闻的新增 public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request, response); // 默认执行doPost() } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { System.out.println("进入了NewsAddServlet"); News news = new News(); NewsService service = new NewsServiceImpl(); // 解决乱码问题 request.setCharacterEncoding("utf-8"); // 01.文件上传到 哪里去？？？ 我们必须指定用户的上传位置 String uploadFilePath = request.getSession().getServletContext() .getRealPath("upload/"); // 不确定文件是否已经存在 File file = new File(uploadFilePath); if (!file.exists()) { // 不存在 创建 file.mkdirs(); } // 02.判断前台的form表单是否带有文件 boolean flag = ServletFileUpload.isMultipartContent(request); try { if (flag) { // 如果是文件上传 /* * 如果上传的文件比较小，则直接保存在内存中，速度快！ 文件大的时候，以临时文件的形式，保存在电脑的临时文件夹中！ * 我们使用FileItemFactory 接口的对应 实现类 来完成 上传操作 */ DiskFileItemFactory factory = new DiskFileItemFactory(); ServletFileUpload upload = new ServletFileUpload(factory); // 能把请求中的所有元素进行获取！ 返回一个FileItem的集合 List<FileItem> items = upload.parseRequest(request); // 获取Iterator迭代器 Iterator<FileItem> iter = items.iterator(); // 事先给 没给元素定义一个名称 String fileName = ""; while (iter.hasNext()) { // 遍历出每一个元素 FileItem item = iter.next(); if (item.isFormField()) { // 如果是普通的元素 fileName = item.getFieldName(); // 获取普通元素的名称 if (fileName.equals("title")) { news.setTitle(item.getString("utf-8")); } else if (fileName.equals("author")) { news.setAuthor(item.getString("utf-8")); } else if (fileName.equals("content")) { news.setContent(item.getString("utf-8")); } else if (fileName.equals("summary")) { news.setSummary(item.getString("utf-8")); } else if (fileName.equals("createDate")) { news.setCreateDate(new SimpleDateFormat( "yyyy-MM-dd").parse(item.getString("utf-8"))); } else if (fileName.equals("categoryId")) { news.setCategoryId(Integer.parseInt(item .getString("utf-8"))); } } else { // 操作上传的文件 String fimeName = item.getName(); // 获取上传文件的名称 if (fimeName != null && fimeName != "") { File fullFile = new File(fimeName); // 相当于在uploadFilePath 这个文件下面 // 创建一个文件fullFile.getName() File saveFile = new File(uploadFilePath, fullFile.getName()); // 写入 真正的上传 try { item.write(saveFile); } catch (Exception e) { e.printStackTrace(); } news.setPicPath(fullFile.getName()); // 给news的文件路径赋值 } } } } } catch (NumberFormatException e) { e.printStackTrace(); } catch (FileUploadException e) { e.printStackTrace(); } catch (ParseException e) { e.printStackTrace(); } service.addNews(news); // 调用底层代码 进行新增操作 // 新增成功了之后 需要返回到新闻列表界面 转发 会引起 表单的重复提交 // request.getRequestDispatcher("newsList.jsp").forward(request, // response); // 重定向 NewsListServlet 拿到值 放入作用于中 才能 去newsList.jsp页面 response.sendRedirect("NewsListServlet"); } }
=================实现新闻的修改===============================
<%@page import="cn.bdqn.bean.News"%> <%@page import="cn.bdqn.service.impl.NewsServiceImpl"%> <%@page import="cn.bdqn.service.NewsService"%> <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <% String path = request.getContextPath(); String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/"; %> <%-- 引入需要的jstl标签库--%> <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%> <!DOCTYPE HTML> <html> <head> <base href="<%=basePath%>"> <title>My JSP 'index.jsp' starting page</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"> <style type="text/css"> <%-- 表格中的数据 居中显示 --%> td { text-align: center; } </style> </head> <body> <form action="NewsListServlet" method="get"> <h1>显示新闻信息</h1> <table border="1"> <tr> <td>新闻编号</td> <td>新闻标题</td> <td>新闻作者</td> <td>创建时间</td> <td>操作</td> </tr> <c:forEach items="${news}" var="n" varStatus="s"> <c:if test="${s.count%2==0}"> <tr bgcolor="green"> </c:if> <c:if test="${s.count%2!=0}"> <tr bgcolor="pink"> </c:if> <td>${n.getId()}</td> <td>${n.getTitle()}</td> <td>${n.getAuthor()}</td> <td>${n.getCreateDate()}</td> <td><a href="FindNewsServlet?id=${n.getId()}">修改</a> <a href="NewsDelServlet?id=${n.getId()}">删除</a> </td> </tr> </c:forEach> <tr> <td>当前页：${pageUtil.getPageIndex()}</td> <td>总页数：${pageUtil.getTotalPageCount()}</td> <td>总记录数${pageUtil.getTotalCountSize()}</td> </tr> <%-- 引入需要的分页界面 --%> <c:import url="page.jsp"> <c:param name="pageIndex" value="${pageUtil.pageIndex}"></c:param> <c:param name="totalPageCount" value="${pageUtil.totalPageCount}"></c:param> </c:import> </table> </form> </body> </html>
public class FindNewsServlet extends HttpServlet { // 根据id查询到指定的新闻 public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request, response); // doPost() } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { NewsService service = new NewsServiceImpl(); News news = service.findById(request.getParameter("id")); // 放入作用域 request.setAttribute("news", news); // 转发到update.jsp页面 request.getRequestDispatcher("/update.jsp").forward(request, response); } }
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <%-- 引入需要的jstl标签库--%> <%@ taglib prefix="f" uri="http://java.sun.com/jsp/jstl/fmt" %> <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <title>新闻信息修改界面</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> <!-- <link rel="stylesheet" type="text/css" href="styles.css"> --> <%-- 引入我们需要的 富文本 编辑器 --%> <script type="text/javascript" src="ckeditor/ckeditor.js"></script> </head> <body> <h1>新闻信息修改界面</h1> <form action="NewsUpdateServlet" enctype="multipart/form-data" method="post" onsubmit="return check()"> <table> <tr> <td>新闻分类：</td> <td> <select name="categoryId" id="goryId"> <option value="0">请选择新闻类别</option> <%-- 下拉框内容的回显 --%> <option <c:if test="${news.categoryId==1}">selected</c:if> value="1">国内</option> <option <c:if test="${news.categoryId==2}">selected</c:if> value="2">国际</option> <option <c:if test="${news.categoryId==3}">selected</c:if> value="3">娱乐</option> <option <c:if test="${news.categoryId==4}">selected</c:if> value="4">军事</option> <option <c:if test="${news.categoryId==5}">selected</c:if>value="5">财经</option> </select> </td> </tr> <tr> <%-- 页可以使用表单的隐藏域 --%> <td>新闻编号：</td> <td><input type="text" value="${news.id}" name="id" readonly="readonly"/></td> </tr> <tr> <td>新闻标题：</td> <td><input type="text" value="${news.title}" name="title"/></td> </tr> <tr> <td>新闻作者：</td> <td><input type="text" value="${news.author}" name="author"/></td> </tr> <tr> <td>新闻摘要：</td> <td><input type="text" value="${news.summary}" name="summary"/></td> </tr> <tr> <td>创建时间：</td> <td><input type="text" value="<f:formatDate value='${news.createDate}' pattern='yyyy-MM-dd'/>" name="createDate"/> </td> </tr> <tr> <td>选择文件：</td> <td><input type="file" name="picPath"/></td> </tr> <tr> <td>新闻内容：</td> <td><textarea class="ckeditor" name="content"> ${news.content} </textarea> </td> </tr> <tr> <td></td> <td><input type="submit" value="修改"/></td> </tr> </table> </form> </div> </body> </html>
public class NewsUpdateServlet extends HttpServlet { // 修改新闻 public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request, response); // doPost() } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { System.out.println("进入了NewsUpdateServlet"); News news = new News(); NewsService service = new NewsServiceImpl(); // 解决乱码问题 request.setCharacterEncoding("utf-8"); // 01.文件上传到 哪里去？？？ 我们必须指定用户的上传位置 String uploadFilePath = request.getSession().getServletContext() .getRealPath("upload/"); // 不确定文件是否已经存在 File file = new File(uploadFilePath); if (!file.exists()) { // 不存在 创建 file.mkdirs(); } // 02.判断前台的form表单是否带有文件 boolean flag = ServletFileUpload.isMultipartContent(request); try { if (flag) { // 如果是文件上传 /* * 如果上传的文件比较小，则直接保存在内存中，速度快！ 文件大的时候，以临时文件的形式，保存在电脑的临时文件夹中！ * 我们使用FileItemFactory 接口的对应 实现类 来完成 上传操作 */ DiskFileItemFactory factory = new DiskFileItemFactory(); ServletFileUpload upload = new ServletFileUpload(factory); // 能把请求中的所有元素进行获取！ 返回一个FileItem的集合 List<FileItem> items = upload.parseRequest(request); // 获取Iterator迭代器 Iterator<FileItem> iter = items.iterator(); // 事先给 没给元素定义一个名称 String fileName = ""; while (iter.hasNext()) { // 遍历出每一个元素 FileItem item = iter.next(); if (item.isFormField()) { // 如果是普通的元素 fileName = item.getFieldName(); // 获取普通元素的名称 if (fileName.equals("title")) { news.setTitle(item.getString("utf-8")); } else if (fileName.equals("author")) { news.setAuthor(item.getString("utf-8")); } else if (fileName.equals("content")) { news.setContent(item.getString("utf-8")); } else if (fileName.equals("summary")) { news.setSummary(item.getString("utf-8")); } else if (fileName.equals("createDate")) { news.setCreateDate(new SimpleDateFormat( "yyyy-MM-dd").parse(item.getString("utf-8"))); } else if (fileName.equals("categoryId")) { news.setCategoryId(Integer.parseInt(item .getString("utf-8"))); } else if (fileName.equals("id")) { // 设置新闻编号 news.setId(Integer.parseInt(item.getString("utf-8"))); } } else { // 操作上传的文件 String fimeName = item.getName(); // 获取上传文件的名称 if (fimeName != null && fimeName != "") { File fullFile = new File(fimeName); // 相当于在uploadFilePath 这个文件下面 // 创建一个文件fullFile.getName() File saveFile = new File(uploadFilePath, fullFile.getName()); // 写入 真正的上传 try { item.write(saveFile); } catch (Exception e) { e.printStackTrace(); } news.setPicPath(fullFile.getName()); // 给news的文件路径赋值 } } } } } catch (NumberFormatException e) { e.printStackTrace(); } catch (FileUploadException e) { e.printStackTrace(); } catch (ParseException e) { e.printStackTrace(); } service.updateNews(news); // 调用底层代码 进行修改操作 // 重定向 NewsListServlet 拿到值 放入作用于中 才能 去newsList.jsp页面 response.sendRedirect("NewsListServlet"); } }
// 修改新闻 public int updateNews(News news) { getConnection(); // 之前 只是修改了 新闻标题 现在 全部都修改了 String sql = "update news_detail set categoryId=?,title=?,content=?,author=?,summary=?,createDate=?" + " where id=?"; Object[] params = { news.getCategoryId(), news.getTitle(), news.getContent(), news.getAuthor(), news.getSummary(), news.getCreateDate(), news.getId() }; int num = executeUpdate(sql, params); return num; }
=================实现新闻的删除===============================
public class NewsDelServlet extends HttpServlet { // 删除指定的新闻 public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request, response); // 默认执行doPost() } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { System.out.println("进入了NewsDelServlet "); NewsService service = new NewsServiceImpl(); // 获取传递过来的id String id = request.getParameter("id"); News news = service.findById(id); System.out.println(news); // 测试 查看news信息 service.deleteNews(news); // 删除 // 重定向到 新闻处理servlet response.sendRedirect("NewsListServlet"); } }
================验证用户登录后才能进入新闻详情界面=========================
public class LoginServlet extends HttpServlet { // 处理登录请求的servlet public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request, response); // 交给 doPost（）处理请求 } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { System.out.println("进入了 LoginServlet"); // 01.获取用户信息 String userName = request.getParameter("userName"); String password = request.getParameter("password"); User user = new User(); // 把信息保存在 user中 user.setPassword(password); user.setUserName(userName); // 02.从数据库取值 UserService service = new UserServiceImpl(); boolean flag = service.login(user); if (flag) { // 把用户信息放入 作用域 过滤器中需要判断 request.getSession().setAttribute("user", user); // 重定向到 新闻列表servlet 如果直接到新闻界面 是没有值的！ response.sendRedirect("NewsListServlet"); } else { // 重定向到 新闻登录界面 response.sendRedirect("login.jsp"); } } }
public class LoginFilter implements Filter { public void destroy() { System.out.println("LoginFilter在服务器关闭的时候 执行一次 销毁......"); } public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { request.setCharacterEncoding("utf-8"); // 给所有的servlet设置编码格式 HttpServletRequest httpServletRequest = (HttpServletRequest) request; HttpServletResponse httpServletResponse = (HttpServletResponse) response; // 获取session中的用户 User user = (User) httpServletRequest.getSession().getAttribute("user"); // 获取用户请求的路径 String path = httpServletRequest.getRequestURI(); /** * 判断用户url * 我们的登录界面login.jsp 是不能拦截的 * 用户已经登录了 是不能拦截的 */ if (path.indexOf("login") > -1 || (user != null)) { chain.doFilter(request, response); } else { httpServletResponse.sendRedirect("login.jsp"); } } public void init(FilterConfig filterConfig) throws ServletException { System.out.println("LoginFilter在服务器启动的时候 执行一次 初始化......"); } }
把login.jsp页面中的form表单 action改成login! 同样的 在web.xml中的LoginServlet对应的mapping url 页要改成 /login
<!-- web.xml文件 加载的顺序 01. context-param :所有servlet共享 02.listener 03.filter 如果有多个 按照 filterClass 加载的顺序 04.servlet filter 可以配置很多！ 真正执行的顺序是什么？ 按照filter-Mapping的顺序 执行！ load-on-startup: 值没有设置，或者为负数的时候，都是在用户访问的时候 执行初始化操作！ 值为0或者大于0时，都是在服务器启动的时候初始化！ 值越小 初始化越早！ -->
/** * 使用注解可以替换 web.xml文件中的配置 * * 环境必须是java ee6版本 * value="/LoginServlet" 必须加上/ * urlPatterns={"/LoginServlet","login"} * value和urlPatterns 不能同时存在 * * 如果只有一个value属性可以省略 * 比如@WebServlet("/LoginServlet") 也是正确的！ * 等同于@WebServlet(value="/LoginServlet") */ @WebServlet("/LoginServlet") public class LoginServlet extends HttpServlet
//多个初始化参数的配置 @WebServlet(value="/LoginServlet",initParams={@WebInitParam(name="name",value="小黑"), @WebInitParam(name="age",value="50")}) public class LoginServlet extends HttpServlet {
作者：Rick__想太多先森
出处：http://www.cnblogs.com/xtdxs/
注意：本文仅代表个人理解和看法哟！和本人所在公司和团体无任何关系！
