目錄
[TOC]
前言
最近在寫自己的個人博客系統，框架采用SpringMVC、Spring4.0、Spring Data/JPA組合，本博客就文檔歸檔功能在Spring Data JPA框架下是如何實現的進行記錄。
文章信息設計
數據暫時這樣設計，僅供學習參考，對于文章評論回復，欄目之間的關聯還沒設計，不過本博客的目的是記錄文檔歸檔功能的實現，這個并不會影響
這里寫圖片描述
VO類：全部采用注解，注意因為我數據庫表名為article，所以不需要寫@Table注解，表名為其它的話，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;
/**
* 博客系統文章信息的實體類
* @author Nicky
*/
@Entity
public class Article {
/** 文章Id，自增**/
private int articleId;
/** 文章名稱**/
private String articleName;
/** 文章發布時間**/
private Date articleTime;
/** 圖片路徑，測試**/
private String imgPath;
/** 文章內容**/
private String articleContent;
/** 查看人數**/
private int articleClick;
/** 是否博主推薦。0為否；1為是**/
private int articleSupport;
/** 是否置頂。0為；1為是**/
private int articleUp;
/** 文章類別。0為私有，1為公開，2為僅好友查看**/
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;
}
}
代碼實現步驟
文章表里有很多數據，要按照年月獲取文章進行歸檔的話，我們可以使用如下SQL對數據進行分組
SELECT YEAR(articleTime) AS 'year',MONTH(articleTime) AS 'month',COUNT(*) AS 'count' FROM article
GROUP BY YEAR(articleTime) DESC,MONTH(articleTime);
然后編寫數據庫層的Repository類，類實現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>{
/**
* 文章歸檔信息獲取
* @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類，用@Autowired注解調用
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;
/**
* 文章歸檔信息獲取
* @return
*/
@Transactional
public List<Object[]> findArticleGroupByTime(){
return articleRepository.findArticleGroupByTime();
}
}
然后在Controller里調用，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;
/**
* 訪問博客主頁
* @return
*/
@RequestMapping(value="/toblog",produces="text/html;charset=UTF-8")
public ModelAndView toBlog(HttpServletRequest request, HttpServletResponse response, Model model)throws ClassNotFoundException{
//獲取歸檔文章信息
List<Object[]> archiveArticles = articleService.findArticleGroupByTime();
model.addAttribute("archiveArticles", archiveArticles);
mv.setViewName("myblog/frame/index");
return mv;
}
}
在JSP頁面調用顯示：
<h2><p>文章歸檔</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(${ac[2] })</a></li>
</c:forEach>
</c:when>
<c:otherwise>
<li><a href="#">沒有相關數據</a></li>
</c:otherwise>
</c:choose>
</ul>
效果如圖所示：
這里寫圖片描述
文檔歸檔信息查詢
然后介紹點擊文檔歸檔信息后，獲取文章信息的實現，其實也就是按年月查詢文檔信息
在Repository類里添加方法：
/**
* 按月份獲取文章信息
* @param month
* 月份數
* @return
*/
@Query("from Article a where date_format(a.articleTime,'%Y%m')=date_format((:yearmonth),'%Y%m') "
+ "order by articleTime desc")
public List<Article> findArticleByMonth(@Param("yearmonth")Date yearmonth);
Service類里調用：
/**
* 按月份獲取文章信息
* @param month
* @return
*/
@Transactional
public List<Article> findArticleByMonth(Date month){
return articleRepository.findArticleByMonth(month);
}
在JSP頁面寫入，getArchiveArticles.do就是要訪問的url，傳入yearmonth參數就可以
<h2><p>文章歸檔</p></h2>
<ul class="news">
<c:choose>
<c:when test="${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="#">沒有相關數據</a></li>
</c:otherwise>
</c:choose>
</ul>
在Controller類里進行處理：
@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;
}
這里寫圖片描述
附錄(工具類、公共類代碼)
DateUtils.java、BaseController.java類
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:此處為嚴格模式解析，即20151809這樣的日期會解析錯誤
*
* @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:此處為嚴格模式解析，即20151809這樣的日期會解析錯誤
*
* @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對象
*/
public HttpServletRequest getRequest() {
HttpServletRequest request = ((ServletRequestAttributes)RequestContextHolder.getRequestAttributes()).getRequest();
return request;
}
/**
* 得到ModelAndView
*/
public ModelAndView getModelAndView(){
return new ModelAndView();
}
}
