第八章文章管理模块

创建新的Spring Boot项目，综合运用视频中的知识点，做一个文章管理的后台应用。新的Spring Boot项目Lession20-BlogAdmin。Maven构建工具，包名称com.bjpowernode.blog JDK19，依赖：

Spring Web
Lombok
Thymeleaf
MyBatis Framework
MySQL Driver

依赖还需要Bean Validation 需求：文章管理工作，发布新文章，编辑文章，查看文章内容等

8.1 配置文件

组织配置文件

app-base.yml

article:
  #最低文章阅读数量
  low-read: 10
  #首页显示最多的文章数量
  top-read: 20

db.yml

spring:
  datasource:
    type: com.zaxxer.hikari.HikariDataSource
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/blog?serverTimezone=Asia/Shanghai
    username: root
    password: 123456
    hikari:
      auto-commit: true
      maximum-pool-size: 10
      minimum-idle: 10
      #获取连接时，检测语句
      connection-test-query: select 1
      connection-timeout: 20000
      #其他属性
      data-source-properties:
        cachePrepStmts: true
        dataSource.cachePrepStmtst: true
        dataSource.prepStmtCacheSize: 250
        dataSource.prepStmtCacheSqlLimit: 2048
        dataSource.useServerPrepStmts: true

8.2 视图文件

logo文件
favicon.ico放在static/ 根目录下

创建模板页面

articleList.html

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
  <meta charset="UTF-8">
  <title>文章列表</title>
  <link rel="icon" href="../favicon.ico" type="image/x-icon"/>
  <script src="https://apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js"></script>
</head>
<body>
  <div style="margin-left: 200px">
    <h3>阅读最多的前10篇文章</h3>
    <table  border="1px"  cellspacing="0px" cellpadding="2px">
      <thead>
        <th>选择</th>
        <th>序号</th>
        <th>标题</th>
        <th>副标题</th>
        <th>已读数量</th>
        <th>发布时间</th>
        <th>最后修改时间</th>
        <th>编辑</th>
      </thead>
      <tbody>
        <tr th:each="article,loopStats : ${articleList}">
          <td><input type="checkbox" th:value="${article.id}"></td>
          <td th:text="${loopStats.index+1}"></td>
          <td th:text="${article.title}"></td>
          <td th:text="${article.summary}"></td>
          <td th:text="${article.readCount}"></td>
          <td th:text="${article.createTime}"></td>
          <td th:text="${article.updateTime}"></td>
          <td>
            <a th:href="@{/article/get(id=${article.id})}">编辑</a>
          </td>
        </tr>
        <tr>
          <td colspan="8">
            <table width="100%">
              <tr>
                <td><button id="add" onclick="addArticle()">发布新文章</button></td>
                <td><button id="delete" onclick="deleteArticle()">删除文章</button></td>
                <td><button id="read" onclick="readOverview()">文章概览</button></td>
              </tr>
            </table>
          </td>
        </tr>
      </tbody>
    </table>
    <form id="frm" th:action="@{/view/addArticle}" method="get">
    </form>

    <form id="delfrm" th:action="@{/article/removeArticle}" method="post">
      <input type="hidden" id="idsDom" name="ids" value="" >
    </form>
  </div>
  <script type="text/javascript">

    function addArticle(){
      $("#frm").submit();
    }

    function deleteArticle(){
      var ids = [];
      $("input[type='checkbox']:checked").each( (index,item)=>{
        ids.push( item.value );
      })
      $("#idsDom").val(ids);
      $("#delfrm").submit();
    }

    function readOverview(){

      var ids = [];
      $("input[type='checkbox']:checked").each( (index,item)=>{
        ids.push( item.value );
      })

      if( ids.length != 1){
        alert("选择一个文章查看");
        return;
      }
      $.get("../article/detail/overview", { id:ids[0] }, (data,status)=>{
        alert(data)
      } )
    }
  </script>
</body>
</html>

bind.html

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
</head>
<body>
  <div style="margin-left: 200px">
    <div th:each="field:${errors}">
      <div th:text="${field.field}"></div>
      <div th:text="${field.defaultMessage}"></div>
    </div>
  </div>
</body>
</html>

error.html

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
</head>
<body>
  <div style="margin-left: 200px">
    <div th:text="${error}"></div>
  </div>
</body>
</html>

8.3 Java代码

java代码

model包：

ArticleVO.java

@Data
public class ArticleVO {
  private Integer id;
  private Integer userId;
  private String title;
  private String summary;
  private String content;
  private Integer readCount;
  private LocalDateTime createTime;
  private LocalDateTime updateTime;
}

ArticleParam.java

package com.bjpowernode.blog.model.param;

import jakarta.validation.constraints.Max;
import jakarta.validation.constraints.Min;
import jakarta.validation.constraints.NotBlank;
import jakarta.validation.constraints.NotNull;
import jakarta.validation.constraints.Size;
import java.awt.PageAttributes.MediaType;
import lombok.Data;
import lombok.NonNull;
import org.hibernate.validator.constraints.Range;

@Datapublic class ArticleParam {
  public static interface AddArticle {};
  public static interface EditArticle {};

  @NotNull(message = "修改时必须有id",groups = EditArticle.class)
  @Min(value = 1,message = "id必须从{value}开始",groups = EditArticle.class)
  private Integer id;

  @NotBlank(message = "请输入文章标题",groups ={ AddArticle.class, EditArticle.class })
  @Size(min = 2,max = 20,message = "文章标题{min}-{max}",groups ={ AddArticle.class, EditArticle.class })
  private String title;

  @NotBlank(message = "请输入文章副标题",groups ={ AddArticle.class, EditArticle.class })
  @Size(min = 10,max = 30,message = "文章副标题{min}-{max}",groups ={ AddArticle.class, EditArticle.class })
  private String summary;

  @NotBlank(message = "请输入文章副标题",groups ={ AddArticle.class, EditArticle.class })
  @Size(min = 50,max = 8000,message = "文章至少五十个字,文章至多八千字",groups ={ AddArticle.class, EditArticle.class })
  private String content;
}

ArticleDTO.java

@Data
public class ArticleDTO {
  private Integer id;
  private Integer userId;
  private String title;
  private String summary;
  private Integer readCount;
  private String content;
  private LocalDateTime createTime;
  private LocalDateTime updateTime;
}

po包

ArticlePO.java

@Data
public class ArticlePO {
  private Integer id;
  private Integer userId;
  private String title;
  private String summary;
  private Integer readCount;
  private LocalDateTime createTime;
  private LocalDateTime updateTime;
}

ArticleDetailPO.java

@Data
public class ArticleDetailPO {
  private Integer id;
  private Integer articleId;
  private String content;
}

mapper包

ArticleMapper.java

package com.bjpowernode.blog.mapper;

public interface ArticleMapper {


  @Select("""
        select id,user_id,title,summary,read_count,create_time,update_time
        from article
        where read_count >=#{lowRead}

        order by read_count desc
        limit #{topRead}
      """)
  @Results(id = "ArticleBaseMap", value = {
      @Result(id = true, column = "id", property = "id"),
      @Result(column = "user_id", property = "userId"),
      @Result(column = "title", property = "title"),
      @Result(column = "summary", property = "summary"),
      @Result(column = "read_count", property = "readCount"),
      @Result(column = "create_time", property = "createTime"),
      @Result(column = "update_time", property = "updateTime"),
  })
  List<ArticlePO> topSortByReadCount(Integer lowRead, Integer topRead);

  @Insert("""
      insert into article(user_id,title,summary,read_count,create_time,update_time) \
      values(#{userId},#{title},#{summary},#{readCount},#{createTime},#{updateTime})
      """)
  @Options(useGeneratedKeys = true, keyProperty = "id", keyColumn = "id")
  int insertArticle(ArticlePO articlePO);


  @Insert("""
      insert into article_detail(article_id, content) 
      values (#{articleId},#{content}) 
     """)
  int insertArticleDetail(ArticleDetailPO articleDetailPO);


  @Select("""
      select m.id as articleId,title,summary,content 
      from article m left join article_detail ad 
      on m.id = ad.article_id
      where m.id=#{id}
      """)
  @Results({
      @Result(id = true, column = "articleId", property = "id"),
      @Result(column = "title", property = "title"),
      @Result(column = "summary", property = "summary"),
      @Result(column = "content", property = "content", jdbcType = JdbcType.LONGVARCHAR, javaType = String.class)
  })
  ArticleDTO selectArticleAndDetail(Integer id);


  //更新文章title，summary
  @Update("""
      update article set title=#{title},summary=#{summary} where id=#{id}
      """)
  int updateArticle(ArticlePO articlePO);


  @Update("""
      update article_detail set content=#{content} where article_id=#{articleId}
      """)
  int updateArticleDetail(ArticleDetailPO articleDetailPO);

  //<script>动态sql</script>
  @Delete("""
      <script>
      delete from article where id in
      <foreach item="id" collection="list" open="(" separator="," close=")">
           #{id}
      </foreach>
      </script>
      """)
  int deleteArticle(List<Integer> ids);


  @Delete("""
      <script>
      delete from article_detail where id in
      <foreach item="id" collection="list" open="(" separator="," close=")">
           #{id}
      </foreach>
      </script>
      """)
  int deleteArticleDetail(List<Integer> ids);

  @Select("""
      select id,article_id,content from article_detail
      where article_id= #{id}
      """)
  ArticleDetailPO selectDetailByArticleId(Integer id);
}

ArticleService.java

public interface ArticleService {

  List<ArticlePO> queryTopAritcle();

  boolean addArticle(ArticleDTO article);

  boolean modifyArticle(ArticleParam param);

  int removeArticle(List<Integer> ids);

  ArticleDTO queryByArticleId(Integer id);
  
  String queryTop20Detail(Integer id);
}

ArticleServiceImpl.java

@RequiredArgsConstructor
@Service
public class ArticleServiceImpl implements ArticleService {

  private final ArticleMapper articleMapper;
  private final ArticleSettings articleSettings;

  @Override
  public List<ArticlePO> queryTopAritcle() {
    Integer lowRead = articleSettings.getLowRead();
    Integer topRead = articleSettings.getTopRead();
    return articleMapper.topSortByReadCount(lowRead, topRead);
  }

  @Transactional(rollbackFor = Exception.class)
  @Override
  public boolean addArticle(ArticleDTO article) {
    ArticlePO articlePO = new ArticlePO();
    articlePO.setTitle(article.getTitle());
    articlePO.setSummary(article.getSummary());
    //从登陆信息中获取，现在给个默认
    articlePO.setUserId(new Random().nextInt(1000));
    articlePO.setReadCount(new Random().nextInt(50));
    articlePO.setCreateTime(LocalDateTime.now());
    articlePO.setUpdateTime(LocalDateTime.now());
    articleMapper.insertArticle(articlePO);

    ArticleDetailPO articleDetailPO = new ArticleDetailPO();
    articleDetailPO.setArticleId(articlePO.getId());
    articleDetailPO.setContent(article.getContent());
    articleMapper.insertArticleDetail(articleDetailPO);

    return true;
  }

  @Transactional(rollbackFor = Exception.class)
  public boolean modifyArticle(ArticleParam param){

    ArticlePO  articlePO = new ArticlePO();
    articlePO.setId(param.getId());
    articlePO.setTitle(param.getTitle());
    articlePO.setSummary(param.getSummary());
    int editArticle = articleMapper.updateArticle(articlePO);

    ArticleDetailPO detailPO = new ArticleDetailPO();
    detailPO.setArticleId(param.getId());
    detailPO.setContent(param.getContent());

    int editDetail = articleMapper.updateArticleDetail(detailPO);

    if( editArticle > 0 && editDetail > 0 ){
      return true;
    }
    return false;
  }

  @Transactional(rollbackFor = Exception.class)
  @Override
  public int removeArticle(List<Integer> ids) {
    int master = articleMapper.deleteArticle(ids);
    int detail = articleMapper.deleteArticleDetail(ids);
    return master;
  }

  @Override
  public ArticleDTO queryByArticleId(Integer id) {
    return articleMapper.selectArticleAndDetail(id);
  }

  @Override
  public String queryTop20Detail(Integer id) {
    ArticleDetailPO articleDetailPO = articleMapper.selectDetailByArticleId(id);
    String content = articleDetailPO.getContent();
    if(StringUtils.hasText(content)){
      content = content.substring(0, content.length() >=20 ? 20 : content.length());

    }
    return content;
  }
}

ArticleController.java

@RequiredArgsConstructor
@Controller
public class ArticleController {

  private final ArticleService articleService;

  @GetMapping( value = {"/", "/article/hot"})
  public String showHotArticle(Model model){
    List<ArticlePO> articlePOList = articleService.queryTopAritcle();
    //转为VO
    List<ArticleVO> articleVOList = BeanUtil.copyToList(articlePOList, ArticleVO.class);
    //存储数据
    model.addAttribute("articleList", articleVOList);
    //视图
    return "/blog/articleList";
  }

  //添加文章
  @PostMapping("/article/add")
  public String addArticle(@Validated(ArticleParam.AddArticle.class) ArticleParam param){

    ArticleDTO article = new ArticleDTO();
    article.setTitle(param.getTitle());
    article.setSummary(param.getSummary());
    article.setContent(param.getContent());
    boolean add = articleService.addArticle(article);
    return "redirect:/article/hot";

  }

  //查询文章
  @GetMapping("/article/get")
  public String queryById(Integer id, Model model){
    ArticleDTO articleDTO = articleService.queryByArticleId(id);
    ArticleVO articleVO = BeanUtil.copyProperties(articleDTO, ArticleVO.class);
    model.addAttribute("article",articleVO);
    return "/blog/editArticle";
  }

  //修改文章
  @PostMapping("/article/edit")
  public String modifyArticle(@Validated(ArticleParam.EditArticle.class) ArticleParam param){
    boolean edit = articleService.modifyArticle(param);
    return "redirect:/article/hot";
  }


  //删除文章
  @PostMapping("/article/removeArticle")
  public String removeArticle(@RequestParam("ids") IdType idType){
    System.out.println("ids="+idType);
    if(idType.getIdList() == null){
      throw new IdNullException("Id为null");
    }
    articleService.removeArticle(idType.getIdList());
    return "redirect:/article/hot";
  }

  //查询文章开始的20个字
  @GetMapping("/article/detail/overview")
  @ResponseBody
  public String queryDetail(Integer id){
    String top20Content = articleService.queryTop20Detail(id);
    return  top20Content;
  }
}

IdNullException.java

public class IdNullException extends BlogRootException{

  public IdNullException() {
    super();
  }

  public IdNullException(String message) {
    super(message);
  }
}

BlogRootException.java

public class BlogRootException extends RuntimeException{

  public BlogRootException() {
    super();
  }

  public BlogRootException(String message) {
    super(message);
  }
}

GlobalHandleException.java

@ControllerAdvice
public class GlobalHandleException {

  @ExceptionHandler( BindException.class)
  public String handlerBindException(BindException bindException, Model model){
    BindingResult result = bindException.getBindingResult();
    if( result.hasErrors()){
     model.addAttribute("errors",result.getFieldErrors());
      System.out.println("result.getFieldErrors()="+result.getFieldErrors().size());
    }
    return "/blog/error/bind";
  }

  @ExceptionHandler( Exception.class)
  public String handlerDefaultException(Exception exception, Model model){

    model.addAttribute("msg","请稍后重试！！！");

    return "/blog/error/error";
  }
}

IdType.java

@Data
public class IdType {
  private List<Integer> idList;
}

IdTypeFormatter.java

public class IdTypeFormatter implements Formatter<IdType> {

  @Override
  public IdType parse(String text, Locale locale) throws ParseException {

    IdType idType = new IdType();
    if(StringUtils.hasText(text)){

      List<Integer>  ids = new ArrayList<>();
      for (String id : text.split(",")) {
        ids.add(Integer.parseInt(id));
      }
      idType.setIdList(ids);

    }
    return idType;
  }

  @Override
  public String print(IdType object, Locale locale) {
    return null;
  }
}

ArticleSettings.java

@Data
@ConfigurationProperties(prefix = "article")
public class ArticleSettings {
  private Integer lowRead;
  private Integer topRead;
}

WebMvcSettings.java

@Configuration
public class WebMvcSettings implements WebMvcConfigurer {

  @Override
  public void addFormatters(FormatterRegistry registry) {
    registry.addFormatter(new IdTypeFormatter());
  }

  @Override
  public void addViewControllers(ViewControllerRegistry registry) {
    registry.addViewController("/view/addArticle").setViewName("/blog/addArticle");
  }
}

启动类：
Lession19AdminApplication.java

@MapperScan(basePackages = { "com.bjpowernode.blog.mapper" })
@EnableConfigurationProperties( {ArticleSettings.class} )
@SpringBootApplicationpublic class Lession19AdminApplication {

  public static void main(String[] args) {
    SpringApplication.run(Lession19AdminApplication.class, args);
  }

}

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