简单页面（C标签）+java后台+数据库，对前篇文章的改进

来源：互联网发布：比尔盖茨编程水平编辑：程序博客网时间：2024/06/05 08:57

在前两篇的关于简单页面+java后台+数据库的整体中我们可以看到，虽然功能能够实现但是，页面的代码中插入了好多小脚本，这样导致页面的代码不简洁，所以针对这个问题，我们在页面使用c标签；

首先是前端网页的文件：

addtypes代码：

 <body style="background-image:url(bg3.jpg)">    <h1>这是添加新闻界面</h1>    <form action="TypesServlet" method="post">    <input type="hidden" value="1" name="type">    新闻类型：<input type="text" name="typename"/><br/>    <input type="submit" value="提交">    </form>  </body>

showtypes

<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>//c标签 <body style="background-image:url(bg3.jpg)">    <h1>这是显示页面</h1>    <h1>显示类型</h1>    <table border="1">    <tr><td>编号</td><td>类型</td><td>操作</td></tr>    <c:forEach items="${list}" var="types">     <tr>    <td>${types.id}</td><td>${types.typename}</td>    <td><a href="TypesServlet?type=3&&id=${types.id}">修改</a>         <a href="TypesServlet?type=4&&id=${types.id}">删除</a></td>        </tr>    </c:forEach>    </table>    </body>

updatetypes:

 <body style="background-image:url(bg3.jpg)">    <h1>这是显示页面</h1>    <h1>显示类型</h1>    <table border="1">    <tr><td>编号</td><td>类型</td><td>操作</td></tr>    <c:forEach items="${list}" var="types">     <tr>    <td>${types.id}</td><td>${types.typename}</td>    <td><a href="TypesServlet?type=3&&id=${types.id}">修改</a>         <a href="TypesServlet?type=4&&id=${types.id}">删除</a></td>        </tr>    </c:forEach>    </table>    </body>

addnews代码：

<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %><body style="background-image:url(bg3.jpg)">   <h1>添加内容界面</h1>    <form action="NewsServlet" method="post">    <input type="hidden" value="1" name="type">     标题：<input type="text" name="title"/><br/>      内容：<input type="text" name="contain"/><br/>       作者：<input type="text" name="autor"/><br/>       类型：<select name="typeid">       <c:forEach items="${list}" var="types">       <option value="${types.id}"> ${types.typename }</option>       </c:forEach>         </select>    <input type="submit" value="提交">    </form>  </body>

shownews代码：

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%><body style="background-image:url(bg3.jpg)">    <h1>这是显示页面</h1>    <h1>显示内容</h1>    <table border="1">    <tr><td>编号</td><td>标题</td><td>内容</td><td>作者</td><td>操作</td></tr>    <c:forEach items="${list}" var="news">     <tr>    <td>${news.id}</td><td>${news.title}</td><td>${news.contain}</td><td>${news.autor}</td>    <td><a href="NewsServlet?type=6&&id=${news.id}">修改</a>         <a href="NewsServlet?type=4&&id=${news.id}">删除</a></td>     </tr>     </c:forEach>  </body>

updatenews：

<body style="background-image:url(bg3.jpg)">    <h1>修改内容页面</h1>      <form action="NewsServlet" method="post">    <input type="hidden" value="4" name="type">    <input type="hidden" name="idss" value="${news.id}"/>        标题：<input type="text" name="title" value="${news.title}"/><br/>      内容：<input type="text" name="contain" value="${news.contain}"/><br/>       作者：<input type="text" name="autor"  value="${news.autor}"/><br/>       <input type="submit" value="提交">    </form>  </body>

下面是servlet层的代码

TypeServlet(新闻类型):

package servlet;import java.io.IOException;import java.io.PrintWriter;import java.util.ArrayList;import java.util.List;import javax.servlet.RequestDispatcher;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import entity.types;import service.TypesService;import service.imp.TypesServiceImp;public class TypesServlet extends HttpServlet {/** *  */private static final long serialVersionUID = 1L;public void destroy() {super.destroy(); // Just puts "destroy" string in log}TypesService ts=new TypesServiceImp();public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {request.setCharacterEncoding("utf-8");response.setCharacterEncoding("utf-8");response.setContentType("text/html;charset=utf-8");PrintWriter out = response.getWriter();//再调用post方法this.doPost(request, response);out.flush();out.close();}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {request.setCharacterEncoding("utf-8");response.setCharacterEncoding("utf-8");response.setContentType("text/html;charset=utf-8");//获取type数值来判断进行增删改查,在页面里面设置了String type=request.getParameter("type");if ("1".equals(type)) {//添加方法System.out.println("haha");addtypes(request, response);} else if("2".equals(type)){//查询所有selectall(request, response);}else if("3".equals(type)){//单个查询selectone(request, response);}else if("4".equals(type)){//删除ts.delete(Integer.parseInt(request.getParameter("id")));selectall(request, response);}else if("5".equals(type)){//修改update(request, response);}PrintWriter out = response.getWriter();out.flush();out.close();}/***********************添加方法*********************************************************/public void addtypes(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {String typesname=request.getParameter("typename");int a=ts.addtypes(typesname);if (a>0) {//调用查询方法selectall(request, response);}else {//进入添加新闻类型页面response.sendRedirect("addnews.jsp");}}/***********************查询方法*********************************************************/public void selectall(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {List<types> list=new ArrayList<types>();list=ts.selectall(null);request.setAttribute("list", list);RequestDispatcher rd=request.getRequestDispatcher("showtypes.jsp");rd.forward(request, response);}/***********************修改方法*********************************************************/public void update(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {int id=Integer.parseInt(request.getParameter("id"));String tname=request.getParameter("types");types ty=new types(id, tname);ts.update(ty);System.out.println("更新咯");//调用查询方法selectall(request, response);}/***********************查询一个方法*********************************************************/public void selectone(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {int id=Integer.parseInt(request.getParameter("id"));types ty=ts.selectone(id);request.setAttribute("types",ty);RequestDispatcher rd=request.getRequestDispatcher("updatetypes.jsp");rd.forward(request, response);}public void init() throws ServletException {}}

NewsServlet:

package servlet;import java.io.IOException;import java.io.PrintWriter;import java.util.ArrayList;import java.util.List;import javax.servlet.RequestDispatcher;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import entity.news;import entity.types;import service.NewsService;import service.TypesService;import service.imp.NewsServiceImp;import service.imp.TypesServiceImp;public class NewsServlet extends HttpServlet {NewsService ns=new NewsServiceImp();TypesService ts=new TypesServiceImp();public NewsServlet() {super();}public void destroy() {super.destroy(); // Just puts "destroy" string in log// Put your code here}public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {request.setCharacterEncoding("utf-8");response.setCharacterEncoding("utf-8");response.setContentType("text/html;charset=utf-8");PrintWriter out = response.getWriter();this.doPost(request, response);//再调用post方法out.flush();out.close();}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {request.setCharacterEncoding("utf-8");response.setCharacterEncoding("utf-8");response.setContentType("text/html;charset=utf-8");PrintWriter out = response.getWriter();//获取type值来判断怎么做String type=request.getParameter("type");if ("1".equals(type)) {//添加操作addnews(request, response);} else if("2".equals(type)){//修改操作update(request, response);}else if("3".equals(type)){//查看selectall(request, response);}else if("4".equals(type)){//删除delate(request, response);}else if("5".equals(type)){//查看类型selecttype(request, response);}else if("6".equals(type)){//查看一个，查询先调用查询一个selectone(request, response);}out.flush();out.close();}/*******添加内容*******************************************************************/public void addnews(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {String title=request.getParameter("title");String contain=request.getParameter("contain");String autor=request.getParameter("autor");String typeid=request.getParameter("typeid");news n=new news(title, contain, autor, Integer.parseInt(typeid));int a=ns.addnews(n);if(a>0){//调用查询方法selectall(request, response);}else {response.sendRedirect("addnews");//重定向}}/*******查看所有内容*******************************************************************/public void selectall(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {List<news> list=ns.selectall(null);request.setAttribute("list", list);request.getRequestDispatcher("shownews.jsp").forward(request, response);}/*******查看类型，为查看服务*******************************************************************/public void selecttype(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {List<types> list=ts.selectall(null);request.setAttribute("list", list);request.getRequestDispatcher("addnews.jsp").forward(request, response);//转发}/*******查看一个*******************************************************************/public void selectone(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {int id=Integer.parseInt(request.getParameter("id"));//System.out.println(id);news ne=ns.selectone(id);request.setAttribute("news",ne);RequestDispatcher rd=request.getRequestDispatcher("updatenews.jsp");//转发rd.forward(request, response);}/*******修改内容*******************************************************************/public void update(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {int id=Integer.parseInt(request.getParameter("idss"));String title=request.getParameter("title");String contain=request.getParameter("contain");String autor=request.getParameter("autor");news ne=new news(id, title, contain, autor );ns.update(ne);System.out.println("更新咯");//调用查询方法selectall(request, response);}/*******删除内容*******************************************************************/public void delate(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {ns.delete(Integer.parseInt(request.getParameter("id")));selectall(request, response);}public void init() throws ServletException {// Put your code here}}

之后的Service层和Dao层的代码和我之前的两篇文章结合在一起最终都是一样的，之后这整篇文章的例子我也会上传

这篇的打包文件在这：http://download.csdn.net/download/qq_34178998/9950610

，要注意用两个jar包；

好了这次的博客就更新到这

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