个人博客项目之文章归档实现

「爱情、让人受尽委屈。」 2021-09-12 04:38 450阅读 0赞

### 目录 ###

### 文章目录 ###

*   *   *  目录

\#\#\#前言  
最近在写自己的个人博客系统，框架采用SpringMVC、Spring4.0、Spring Data/JPA组合，本博客就文档归档功能在Spring Data JPA框架下是如何实现的进行记录。  
现在可以star(收藏)，watch(关注)，但是还在开发中，所以还是还在先别下载  
项目github：https://github.com/u014427391/myblog  
\#\#\#文章信息设计  
数据暂时这样设计，仅供学习参考，对于文章评论回复，栏目之间的关联还没设计，不过本博客的目的是记录文档归档功能的实现，这个并不会影响  
![这里写图片描述][format_png]

VO类：全部采用注解，注意因为我数据库表名为article，所以不需要写@Table注解，表名为其它的话，就需要自己添加@Table注解了

package net.myblog.entity;
    
    import java.util.Date;
    
    import javax.persistence.Column;
    import javax.persistence.Entity;
    import javax.persistence.GeneratedValue;
    import javax.persistence.Id;
    import javax.persistence.Temporal;
    import javax.persistence.TemporalType;
    
    /**
     * 博客系统文章信息的实体类
     * @author Nicky
     */
    @Entity
    public class Article {
    	
    	/** 文章Id，自增**/
    	private int articleId;
    	
    	/** 文章名称**/
    	private String articleName;
    	
    	/** 文章发布时间**/
    	private Date articleTime;
    	
    	/** 图片路径，测试**/
    	private String imgPath;
    	
    	/** 文章内容**/
    	private String articleContent;
    	
    	/** 查看人数**/
    	private int articleClick;
    	
    	/** 是否博主推荐。0为否；1为是**/
    	private int articleSupport;
    	
    	/** 是否置顶。0为；1为是**/
    	private int articleUp;
    	
    	/** 文章类别。0为私有，1为公开，2为仅好友查看**/
    	private int articleType;
    	
    	@GeneratedValue
    	@Id
    	public int getArticleId() {
    		return articleId;
    	}
    
    	public void setArticleId(int articleId) {
    		this.articleId = articleId;
    	}
    
    	@Column(length=100, nullable=false)
    	public String getArticleName() {
    		return articleName;
    	}
    
    	public void setArticleName(String articleName) {
    		this.articleName = articleName;
    	}
    
    	@Temporal(TemporalType.DATE)
    	@Column(nullable=false, updatable=false)
    	public Date getArticleTime() {
    		return articleTime;
    	}
    
    	public void setArticleTime(Date articleTime) {
    		this.articleTime = articleTime;
    	}
    
    	@Column(length=100)
    	public String getImgPath() {
    		return imgPath;
    	}
    
    	public void setImgPath(String imgPath) {
    		this.imgPath = imgPath;
    	}
    
    	@Column(nullable=false)
    	public String getArticleContent() {
    		return articleContent;
    	}
    
    	public void setArticleContent(String articleContent) {
    		this.articleContent = articleContent;
    	}
    
    	public int getArticleClick() {
    		return articleClick;
    	}
    
    	public void setArticleClick(int articleClick) {
    		this.articleClick = articleClick;
    	}
    
    	public int getArticleSupport() {
    		return articleSupport;
    	}
    
    	public void setArticleSupport(int articleSupport) {
    		this.articleSupport = articleSupport;
    	}
    
    	public int getArticleUp() {
    		return articleUp;
    	}
    
    	public void setArticleUp(int articleUp) {
    		this.articleUp = articleUp;
    	}
    
    	@Column(nullable=false)
    	public int getArticleType() {
    		return articleType;
    	}
    
    	public void setArticleType(int articleType) {
    		this.articleType = articleType;
    	}
    }

\#\#\#代码实现步骤

文章表里有很多数据，要按照年月获取文章进行归档的话，我们可以使用如下SQL对数据进行分组

SELECT YEAR(articleTime) AS 'year',MONTH(articleTime) AS 'month',COUNT(*) AS 'count' FROM article 
    	GROUP BY YEAR(articleTime) DESC,MONTH(articleTime);

然后编写数据库层的Repository类，类实现Spring Data JPA提供的接口

package net.myblog.repository;
    
    import java.util.Date;
    import java.util.List;
    
    import net.myblog.entity.Article;
    
    import org.springframework.data.jpa.repository.Query;
    import org.springframework.data.repository.PagingAndSortingRepository;
    import org.springframework.data.repository.query.Param;
    
    public interface ArticleRepository extends PagingAndSortingRepository<Article,Integer>{
    	/**
    	 * 文章归档信息获取
    	 * @return
    	 */
    	@Query(value="select year(a.articleTime) as year,month(a.articleTime) as month,"
    			+ "count(a) as count from Article a group by year(a.articleTime),month(a.articleTime)",
    			countQuery="select count(1) from (select count(1) from Article a group by year(a.articleTime),month(a.articleTime))")
    	public List<Object[]> findArticleGroupByTime();
    	
    }

然后在Service类，用@Autowired注解调用

package net.myblog.service;
    
    import java.util.Date;
    import java.util.List;
    
    import net.myblog.entity.Article;
    import net.myblog.repository.ArticleRepository;
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.data.domain.Page;
    import org.springframework.data.domain.PageRequest;
    import org.springframework.data.domain.Sort.Direction;
    import org.springframework.stereotype.Service;
    import org.springframework.transaction.annotation.Transactional;
    
    @Service
    public class ArticleService {
    	
    	@Autowired ArticleRepository articleRepository;
    	/**
    	 * 文章归档信息获取
    	 * @return
    	 */
    	@Transactional
    	public List<Object[]> findArticleGroupByTime(){
    		return articleRepository.findArticleGroupByTime();
    	}
    	
    }

然后在Controller里调用，用的是SpringMVC框架

package net.myblog.web.controller;
    
    import java.util.ArrayList;
    import java.util.List;
    import java.util.Vector;
    
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    import net.myblog.service.ArticleService;
    import net.sf.json.JSONArray;
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.data.domain.Page;
    import org.springframework.data.domain.Sort.Direction;
    import org.springframework.stereotype.Controller;
    import org.springframework.ui.Model;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.servlet.ModelAndView;
    
    @Controller
    public class BlogIndexController extends BaseController{
    	
    	@Autowired
    	ArticleService articleService;
    	
    	/**
    	 * 访问博客主页
    	 * @return
    	 */
    	@RequestMapping(value="/toblog",produces="text/html;charset=UTF-8")
    	public ModelAndView toBlog(HttpServletRequest request, HttpServletResponse response, Model model)throws ClassNotFoundException{
    		
    		//获取归档文章信息
    		List<Object[]> archiveArticles = articleService.findArticleGroupByTime();
    		
    		model.addAttribute("archiveArticles", archiveArticles);
    		mv.setViewName("myblog/frame/index");
    		return mv;
    	}
    	
    }

在JSP页面调用显示：

<h2><p>文章归档</p></h2>
    <ul class="news">
      <c:choose>
    	<c:when test="${not empty archiveArticles }">
    		<c:forEach items="${archiveArticles }" var="ac">
    		<li><a href="getArchiveArticles.do?yearmonth=${ac[0]}-${ac[1]}">
    		${ac[0]}年${ac[1]}月(${ac[2] })</a></li>
    		</c:forEach>
    	</c:when>
    	<c:otherwise>
    		<li><a href="#">没有相关数据</a></li>
    	</c:otherwise>  
      </c:choose>
    </ul>

效果如图所示：  
![这里写图片描述][format_png 1]

\#\#\#文档归档信息查询  
然后介绍点击文档归档信息后，获取文章信息的实现，其实也就是按年月查询文档信息

在Repository类里添加方法：

/**
    	 * 按月份获取文章信息
    	 * @param month
    	 * 			月份数
    	 * @return
    	 */
    	@Query("from Article a where date_format(a.articleTime,'%Y%m')=date_format((:yearmonth),'%Y%m') "
    			+ "order by articleTime desc")
    	public List<Article> findArticleByMonth(@Param("yearmonth")Date yearmonth);

Service类里调用：

/**
    	 * 按月份获取文章信息
    	 * @param month
    	 * @return
    	 */
    	@Transactional
    	public List<Article> findArticleByMonth(Date month){
    		return articleRepository.findArticleByMonth(month);
    	}

在JSP页面写入，getArchiveArticles.do就是要访问的url，传入yearmonth参数就可以

在Controller类里进行处理：

@RequestMapping("/getArchiveArticles")
    	public ModelAndView getArticleByMonth(HttpServletRequest request){
    		String yearMonthString = request.getParameter("yearmonth");
    		System.out.println("month:"+yearMonthString);
    		ModelAndView mv = this.getModelAndView();
    		
    		Date yearmonth = DateUtils.parse("yyyy-MM", yearMonthString);
    		
    		List<Article> articles = articleService.findArticleByMonth(yearmonth);
    
    		mv.addObject("articles", articles);
    		mv.setViewName("myblog/article/archive_articles");
    		return mv;
    	}

![这里写图片描述][format_png 2]

\#\#\#附录(工具类、公共类代码)  
DateUtils.java、BaseController.java类  
DateUtil.java

package net.myblog.utils;
    
    import java.text.ParseException;
    import java.text.SimpleDateFormat;
    import java.util.Date;
    import java.util.Locale;
    
    import net.myblog.core.Constants;
    
    public class DateUtils {
    	
    	public static String formatDate(Date date) throws ParseException{
    		SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    		return dateFormat.format(date);
    	}
    	
    	 /**
    	   * 解析日期，注:此处为严格模式解析，即20151809这样的日期会解析错误
    	   * 
    	   * @param pattern
    	   * @param date
    	   * @return
    	   */
    	  public static Date parse(String pattern, String date){
    	    return parse(pattern, date, Constants.LOCALE_CHINA);
    	  }
    
    	  /**
    	   * 解析日期，注:此处为严格模式解析，即20151809这样的日期会解析错误
    	   * 
    	   * @param pattern
    	   * @param date
    	   * @param locale
    	   * @return
    	   */
    	  public static Date parse(String pattern, String date, Locale locale){
    	    SimpleDateFormat format = new SimpleDateFormat(pattern, locale);
    	    format.setLenient(false);
    	    Date result = null;
    	    try{
    	      result = format.parse(date);
    	    }catch(Exception e){
    	      e.printStackTrace();
    	    }
    
    	    return result;
    	  }
    
    }

BaseController.java:

package net.myblog.web.controller;
    
    import javax.servlet.http.HttpServletRequest;
    
    import org.springframework.web.context.request.RequestContextHolder;
    import org.springframework.web.context.request.ServletRequestAttributes;
    import org.springframework.web.servlet.ModelAndView;
    
    public class BaseController {
    	
    	/**
    	 * 得到request对象
    	 */
    	public HttpServletRequest getRequest() {
    		HttpServletRequest request = ((ServletRequestAttributes)RequestContextHolder.getRequestAttributes()).getRequest();
    		
    		return request;
    	}
    	
    	/**
    	 * 得到ModelAndView
    	 */
    	public ModelAndView getModelAndView(){
    		return new ModelAndView();
    	}
    
    
    }

[format_png]: /images/20210813/55e6eb7d9eae409ca8cc2cdb543c80b9.png
[format_png 1]: /images/20210813/d7d054f657db49bc9764bcf7fc8ce708.png
[format_png 2]: /images/20210813/a4c57fdd3efd4834a5f93f737d300e66.png