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2024-09-07 15:30:27 216人阅读

在这一讲中有几个很重要的地方需要注意：

　　1.在查询帖子的时候需要把帖子类型id带到帖子类型表中把类型查询出来

　　2.在字帖子查询语句中用limt限制查询那个阶段的帖子

　　3.在界面显示的时候需要用到字符串截取标签和日期时间标签

2.代码实现

　　2.1创建帖子类：

package com.open1111.entity;

import java.util.Date;

/**
* 帖子实体类
* @author user
*
*/
public class Article {

private Integer id; // 编号
private String title; // 标题
private Date publishDate; // 发布日期
private String content; // 内容
private String summary; // 摘要
private String titleColor; // 标题颜色默认黑色
private Integer click=0; // 阅读次数
private Integer isRecommend=0; // 是否推荐帖子 1 是 0 否
private Integer isSlide=0; // 是否是幻灯帖子 1 是 0 否
private ArcType arcType; // 帖子类型
private String keyWords; // 关键字

public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public Date getPublishDate() {
return publishDate;
}
public void setPublishDate(Date publishDate) {
this.publishDate = publishDate;
}
public String getContent() {
return content;
}
public void setContent(String content) {
this.content = content;
}
public String getSummary() {
return summary;
}
public void setSummary(String summary) {
this.summary = summary;
}
public String getTitleColor() {
return titleColor;
}
public void setTitleColor(String titleColor) {
this.titleColor = titleColor;
}
public Integer getClick() {
return click;
}
public void setClick(Integer click) {
this.click = click;
}
public Integer getIsRecommend() {
return isRecommend;
}
public void setIsRecommend(Integer isRecommend) {
this.isRecommend = isRecommend;
}
public Integer getIsSlide() {
return isSlide;
}
public void setIsSlide(Integer isSlide) {
this.isSlide = isSlide;
}
public ArcType getArcType() {
return arcType;
}
public void setArcType(ArcType arcType) {
this.arcType = arcType;
}
public String getKeyWords() {
return keyWords;
}
public void setKeyWords(String keyWords) {
this.keyWords = keyWords;
}
}

　　2.2：创建帖子到对应的mapper

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.open1111.dao.ArticleDao">

<resultMap type="Article" id="ArticleResult">
<result property="id" column="id"/>
<result property="title" column="title"/>
<result property="publishDate" column="publishDate"/>
<result property="content" column="content"/>
<result property="summary" column="summary"/>
<result property="titleColor" column="titleColor"/>
<result property="click" column="click"/>
<result property="isRecommend" column="isRecommend"/>
<result property="isSlide" column="isSlide"/>
<result property="keyWords" column="keyWords"/>

<association property="arcType" column="typeId" select="com.open1111.dao.ArcTypeDao.findById"></association>
</resultMap>

<select id="getNewest" resultMap="ArticleResult">
select * from t_article order by publishDate desc limit 0,7
</select>

</mapper>

　　2.3：创建帖子的dao：

package com.open1111.dao;

import java.util.List;

import com.open1111.entity.Article;

/**
* 帖子Dao接口
* @author user
*
*/
public interface ArticleDao {

/**
* 获取最新的7条帖子
* @return
*/
public List<Article> getNewest();
}

2.4：由于帖子需要查询帖子类型所在帖子类型mapper中添加一个根据id查询帖子类型的方法：

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.open1111.dao.ArcTypeDao">

<resultMap type="ArcType" id="ArcTypeResult">
<result property="id" column="id"/>
<result property="typeName" column="typeName"/>
<result property="sortNo" column="sortNo"/>
<result property="keywords" column="keywords"/>
<result property="description" column="description"/>
</resultMap>

<select id="list" parameterType="Map" resultMap="ArcTypeResult">
select * from t_arcType
order by sortNo asc
</select>

<select id="findById" parameterType="Integer" resultMap="ArcTypeResult">
select * from t_arcType where id=#{id}
</select>

</mapper>

2.5：更改mapper时候更改对应的dao

package com.open1111.dao;

import java.util.List;
import java.util.Map;

import com.open1111.entity.ArcType;

/**
* 帖子类别Dao接口
* @author user
*
*/
public interface ArcTypeDao {

/**
* 根据条件分页查询帖子类别集合
* @param map
* @return
*/
public List<ArcType> list(Map<String,Object> map);

/**
* 根据id查询实体
* @param id
* @return
*/
public ArcType findById(Integer id);
}

2.6创建帖子service：

package com.open1111.service;

import java.util.List;
import java.util.Map;

import com.open1111.entity.ArcType;

/**
* 帖子类别Service接口
* @author user
*
*/
public interface ArcTypeService {

/**
* 根据条件分页查询帖子类别集合
* @param map
* @return
*/
public List<ArcType> list(Map<String,Object> map);
}

2.7创建帖子的serviceImpl

package com.open1111.service.impl;

import java.util.List;

import javax.annotation.Resource;

import org.springframework.stereotype.Service;

import com.open1111.dao.ArticleDao;
import com.open1111.entity.Article;
import com.open1111.service.ArticleService;

/**
* 帖子Service实现类
* @author user
*
*/
@Service("articleService")
public class ArticleServiceImpl implements ArticleService{

@Resource
private ArticleDao articleDao;

public List<Article> getNewest() {
return articleDao.getNewest();
}

}

2.8：把查询到的数据放到application中

package com.open1111.service.impl;

import java.util.List;

import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

import com.open1111.entity.ArcType;
import com.open1111.entity.Article;
import com.open1111.entity.Link;
import com.open1111.service.ArcTypeService;
import com.open1111.service.ArticleService;
import com.open1111.service.LinkService;

/**
* 初始化组件
* @author user
*
*/
@Component("initComponet")
public class InitComponet implements ApplicationContextAware,ServletContextListener{

private static ApplicationContext applicationContext;

public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
// TODO Auto-generated method stub
this.applicationContext=applicationContext;
System.out.println(this);
}

/**
* 刷新application缓存方法
* @param application
*/
public void refreshSystem(ServletContext application){
LinkService linkService=(LinkService) applicationContext.getBean("linkService");
List<Link> linkList=linkService.list(null);
application.setAttribute("linkList", linkList);

ArcTypeService arcTypeService=(ArcTypeService) applicationContext.getBean("arcTypeService");
List<ArcType> arcTypeList=arcTypeService.list(null);
application.setAttribute("arcTypeList", arcTypeList);

ArticleService articleService=(ArticleService) applicationContext.getBean("articleService");
List<Article> newestArticleList=articleService.getNewest(); // 获取最新7条帖子
application.setAttribute("newestArticleList", newestArticleList);
}

public void contextInitialized(ServletContextEvent sce) {
// TODO Auto-generated method stub
ServletContext application=sce.getServletContext();
refreshSystem(application);
}

public void contextDestroyed(ServletContextEvent sce) {
// TODO Auto-generated method stub

}

}

2.9：前台循环出帖子：

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt"%>
<!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>Open1111官方网站 -南通小锋网络科技有限公司</title>
<META NAME="Author" CONTENT="Java1234_小锋老师">
<meta name="keywords"
content="Java内容管理系统,JavaCMS,Java开源,Java爬虫,JavaSEO,Java CMS" />
<meta name="description"
content="Open1111专注于研发Java建站,Java爬虫,JavaSEO教程.传授广大学员用Java技术来实现互联网资源的搬运,整合汇聚互联网资源建站,顺便获取一些搬运费补贴家用." />
<link rel="stylesheet"
href="http://www.mamicode.com/${pageContext.request.contextPath}/static/css/open1111.css">
<script src="http://www.mamicode.com/${pageContext.request.contextPath}/static/js/jQuery.js"></script>
</head>
<body>
<jsp:include page="/common/head.jsp"></jsp:include>
<jsp:include page="/common/menu.jsp"></jsp:include>

</div>

<div class="data_list">
<div class="dataHeader">最近更新</div>
<div class="datas">
<ul>
<c:forEach var="article" items="${newestArticleList }">
<li><a target="_blank" href="http://www.mamicode.com/${pageContext.request.contextPath}/article/${article.id}.html"
title="${article.title }">[<fmt:formatDate value="http://www.mamicode.com/${article.publishDate }" pattern="MM-dd"/>]  <font
color="${article.titleColor }">${fn:substring(article.title,0,20) }</font></a></li>
</c:forEach>
</ul>
</div>
</div>

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