JavaWeb项目开发案例精粹-第2章投票系统-002配置文件及公共类

1.

 <?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">
     <filter>                                <!--定义核心Filter FilterDispatcher -->
         <filter-name>struts2</filter-name>    <!-- 定义核心Filter的名称 -->
         <filter-class>                        <!--定义核心Filter的实现类 -->
             org.apache.struts2.dispatcher.FilterDispatcher
         </filter-class>
     </filter>
     <filter-mapping>
         <filter-name>struts2</filter-name><!--核心Filter的名称 -->
         <url-pattern>/*</url-pattern><!--使用该核心Filter过滤所有的Web请求 -->
     </filter-mapping>
 </web-app>

2.

 <?xml version="1.0" encoding="UTF-8" ?><!-- XML声明 -->
 <!DOCTYPE struts PUBLIC
  "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN"
  "http://struts.apache.org/dtds/struts-2.1.dtd"><!-- 指定Struts 2配置文件的DTD信息 -->
 <struts><!-- 根节点 -->
     <constant name="struts.i18n.encoding" value="gb2312"></constant>
     <package name="struts2" extends="jfreechart-default">
          <action name="addVote" class="com.sanqing.action.AddVoteAction">
              <result name="success">/admin/addVote.jsp</result>
          </action>
          <action name="showVote" class="com.sanqing.action.ShowVoteAction">
              <result name="success">/admin/showVote.jsp</result>
          </action>
          <action name="deleteVote" class="com.sanqing.action.DeleteVoteAction">
              <result name="success" type="chain">showVote</result>
          </action>
          <action name="showVoteByChannel" class="com.sanqing.action.ShowVoteByChannelAction">
              <result name="success">index.jsp</result>
              <result name="input">index.jsp</result>
          </action>
          <action name="voteResult" class="com.sanqing.action.VoteResultAction">
              <result name="success" type="chart">
                  <param name="width">400</param>
                  <param name="height">300</param>
              </result>
          </action>
          <action name="doVote" class="com.sanqing.action.DoVoteAction">
              <result name="success" type="chain">voteResult</result>
              <result name="input" type="chain">showVoteByChannel</result>
          </action>
      </package>
 </struts>

3.jfreechart-default.xml

 <?xml version="1.0" encoding="UTF-8" ?>
 <!--
 /*
  * $Id: struts-plugin.xml 651946 2008-04-27 13:41:38Z apetrelli $
  *
  * Licensed to the Apache Software Foundation (ASF) under one
  * or more contributor license agreements.  See the NOTICE file
  * distributed with this work for additional information
  * regarding copyright ownership.  The ASF licenses this file
  * to you under the Apache License, Version 2.0 (the
  * "License"); you may not use this file except in compliance
  * with the License.  You may obtain a copy of the License at
  *
  *  http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing,
  * software distributed under the License is distributed on an
  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  * KIND, either express or implied.  See the License for the
  * specific language governing permissions and limitations
  * under the License.
  */
 -->
 <!DOCTYPE struts PUBLIC
     "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
     "http://struts.apache.org/dtds/struts-2.0.dtd">
 
 <struts>
     <package name="jfreechart-default" extends="struts-default">
 
         <result-types>
             <result-type name="chart" class="org.apache.struts2.dispatcher.ChartResult">
                 <param name="height">150</param>
                 <param name="width">200</param>
             </result-type>
         </result-types>
     </package>
 
 </struts>

4.

 package com.sanqing.util;
 
 import java.sql.Connection;
 import java.sql.DriverManager;
 import java.sql.PreparedStatement;
 import java.sql.ResultSet;
 import java.sql.SQLException;
 
 public class DBConnection {
     private static final String DBDRIVER = "com.mysql.jdbc.Driver" ;            //驱动类类名
     private static final String DBURL = "jdbc:mysql://localhost:3306/db_votemanage";//连接URL
     private static final String DBUSER = "root" ;                                //数据库用户名
     private static final String DBPASSWORD = "1234";                            //数据库密码
     public static Connection getConnection(){
         Connection conn = null;                                                    //声明一个连接对象
         try {
             Class.forName(DBDRIVER);                                            //注册驱动
             conn = DriverManager.getConnection(DBURL,DBUSER,DBPASSWORD);        //获得连接对象
         } catch (ClassNotFoundException e) {                                    //捕获驱动类无法找到异常
             e.printStackTrace();
         } catch (SQLException e) {                                                //捕获SQL异常
             e.printStackTrace();
         }
         return conn;
     }
     public static void close(Connection conn) {//关闭连接对象
         if(conn != null) {                //如果conn连接对象不为空
             try {
                 conn.close();            //关闭conn连接对象对象
             } catch (SQLException e) {
                 e.printStackTrace();
             }
         }
     }
     public static void close(PreparedStatement pstmt) {//关闭预处理对象
         if(pstmt != null) {                //如果pstmt预处理对象不为空
             try {
                 pstmt.close();            //关闭pstmt预处理对象
             } catch (SQLException e) {
                 e.printStackTrace();
             }
         }
     }
     public static void close(ResultSet rs) {//关闭结果集对象
         if(rs != null) {                //如果rs结果集对象不为null
             try {
                 rs.close();                //关闭rs结果集对象
             } catch (SQLException e) {
                 e.printStackTrace();
             }
         }
     }
 }

5.

 package com.sanqing.util;
 public class Page {
     private int everyPage;            //每页显示记录数
     private int totalCount;            //总记录数
     private int totalPage;            //总页数
     private int currentPage;        //当前页
     private int beginIndex;            //查询起始点
     private boolean hasPrePage;        //是否有上一页
     private boolean hasNextPage;    //是否有下一页
     public Page(int everyPage, int totalCount, int totalPage,
             int currentPage,int beginIndex, boolean hasPrePage,
             boolean hasNextPage) {    //自定义构造方法
         this.everyPage = everyPage;
         this.totalCount = totalCount;
         this.totalPage = totalPage;
         this.currentPage = currentPage;
         this.beginIndex = beginIndex;
         this.hasPrePage = hasPrePage;
         this.hasNextPage = hasNextPage;
     }
     public Page(){}                    //默认构造函数
     public int getEveryPage() {        //获得每页显示记录数
         return everyPage;
     }
     public void setEveryPage(int everyPage) {//设置每页显示记录数
         this.everyPage = everyPage;
     }
     public int getTotalCount() {//获得总记录数
         return totalCount;
     }
     public void setTotalCount(int totalCount) {//设置总记录数
         this.totalCount = totalCount;
     }
     public int getTotalPage() {//获得总页数
         return totalPage;
     }
     public void setTotalPage(int totalPage) {//设置总页数
         this.totalPage = totalPage;
     }
     public int getCurrentPage() {//获得当前页
         return currentPage;
     }
     public void setCurrentPage(int currentPage) {//设置当前页
         this.currentPage = currentPage;
     }
     public int getBeginIndex() {//获得查询起始点
         return beginIndex;
     }
     public void setBeginIndex(int beginIndex) {//设置查询起始点
         this.beginIndex = beginIndex;
     }
     public boolean isHasPrePage() {//获得是否有上一页
         return hasPrePage;
     }
     public void setHasPrePage(boolean hasPrePage) {//设置是否有上一页
         this.hasPrePage = hasPrePage;
     }
     public boolean isHasNextPage() {//获得是否有下一页
         return hasNextPage;
     }
     public void setHasNextPage(boolean hasNextPage) {//设置是否有下一页
         this.hasNextPage = hasNextPage;
     }
 }

6.

 package com.sanqing.util;
 /*
  * 分页信息辅助类
  */
 public class PageUtil {
     public static Page createPage(int everyPage,int totalCount,int currentPage) {//创建分页信息对象
         everyPage = getEveryPage(everyPage);
         currentPage = getCurrentPage(currentPage);
         int totalPage = getTotalPage(everyPage, totalCount);
         int beginIndex = getBeginIndex(everyPage, currentPage);
         boolean hasPrePage = getHasPrePage(currentPage);
         boolean hasNextPage = getHasNextPage(totalPage, currentPage);
         return new Page(everyPage, totalCount, totalPage, currentPage,
                 beginIndex, hasPrePage,  hasNextPage);
     }
     public static int getEveryPage(int everyPage) {        //获得每页显示记录数
         return everyPage == 0 ? 10 : everyPage;
     }
     public static int getCurrentPage(int currentPage) {    //获得当前页
         return currentPage == 0 ? 1 : currentPage;
     }
     public static int getTotalPage(int everyPage,int totalCount) {//获得总页数
         int totalPage = 0;
         if(totalCount != 0 &&totalCount % everyPage == 0) {
             totalPage = totalCount / everyPage;
         } else {
             totalPage = totalCount / everyPage + 1;
         }
         return totalPage;
     }
     public static int getBeginIndex(int everyPage,int currentPage) {//获得起始位置
         return (currentPage - 1) * everyPage;
     }
     public static boolean getHasPrePage(int currentPage) {//获得是否有上一页
         return currentPage == 1 ? false : true;
     }
     public static boolean getHasNextPage(int totalPage, int currentPage) {    //获得是否有上一页
         return currentPage == totalPage || totalPage == 0 ? false : true;
     }
 }