个人博客项目之文章归档实现
        【摘要】     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:...
    
    
    
    目录
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;
	}
}
  
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###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);
  
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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();
	
}
  
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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();
	}
	
}
  
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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;
	}
	
}
  
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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>
  
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效果如图所示:
 
###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);
  
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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);
	}
  
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在JSP页面写入,getArchiveArticles.do就是要访问的url,传入yearmonth参数就可以
<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>
  
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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;
	}
  
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###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; }
}
  
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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();
	}
}
  
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文章来源: smilenicky.blog.csdn.net,作者:smileNicky,版权归原作者所有,如需转载,请联系作者。
原文链接:smilenicky.blog.csdn.net/article/details/68958115
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