thymeleaf+mybatis（本文章用于期末考前10分钟速看）

期末速看

pom（了解）
application.properties
sql
代码
- Controller控制层
- 视图
- service：服务层
- mapper（dao）：持久层
- entity层(model层，domain层、 bean)：对应数据库表，实体类
效果

使用Spring Boot整合Mybatis，在浏览器中实现对评论数据的增删改查操作。thymeleaf+mybatis

链接：https://pan.baidu.com/s/12BQcCwJ_2fvTzf5YxexLgg?pwd=1024
提取码：1024
网盘里有我录的视频

pom（了解）

<version>2.7.0</version><java.version>1.8</java.version><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId>
</dependency>
<dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId><version>2.3.0</version>
</dependency>

在这里插入图片描述

application.properties

spring.datasource.url=jdbc:mysql://localhost:3306/mydb2?useSSL=false
spring.datasource.username=root
spring.datasource.password=123456

sql

use mydb2;
DROP TABLE IF EXISTS `t_comment`;
CREATE TABLE `t_comment` (`id` int(11) NOT NULL AUTO_INCREMENT COMMENT '评论id',`article_id` int(11)  COMMENT '关联的文章id',`created` date  COMMENT '评论时间',`ip` varchar(200) DEFAULT NULL COMMENT '评论用户登录的ip地址',`content` text NOT NULL COMMENT '评论内容',`status` varchar(200)  DEFAULT 'approved' COMMENT '评论状态',`author` varchar(200) NOT NULL COMMENT '评论用户用户名',PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
INSERT INTO `t_comment` VALUES ('1', '12', '2018-12-13', '0:0:0:0:0:0:0:1', '很不错，不过这文章排版不太好看啊', 'approved', '李四');
INSERT INTO `t_comment` VALUES ('2', '11', '2018-12-13', '0:0:0:0:0:0:0:1', '很不错的原理分析，受用了！', 'approved', '李四');
INSERT INTO `t_comment` VALUES ('3', '10', '2018-12-13', '0:0:0:0:0:0:0:1', '关于Docker虚拟容器的讲解挺好的额，学习中', 'approved', '李四');
INSERT INTO `t_comment` VALUES ('9', '1', '2018-12-13', '0:0:0:0:0:0:0:1', '非常不错，赞一个！', 'approved', '李四');
INSERT INTO `t_comment` VALUES ('10', '1', '2018-12-13', '0:0:0:0:0:0:0:1', '博主，这资料怎么弄的？有相关资源和教材推荐吗？', 'approved', '李四');
INSERT INTO `t_comment` VALUES ('11', '1', '2018-12-13', '0:0:0:0:0:0:0:1', '很详细，感谢...', 'approved', '东方不败');
INSERT INTO `t_comment` VALUES ('12', '1', '2018-12-13', '0:0:0:0:0:0:0:1', '很全，努力学习中...', 'approved', '东方不败');
INSERT INTO `t_comment` VALUES ('13', '1', '2018-12-13', '0:0:0:0:0:0:0:1', '好东西，先收藏起来，哈哈', 'approved', 'tom');
INSERT INTO `t_comment` VALUES ('14', '8', '2018-12-13', '0:0:0:0:0:0:0:1', 'very good blog', 'approved', 'tom');

代码

Controller控制层

@Controller
public class CommentController {@Autowiredprivate  CommentService commentService;@GetMapping("/index")public String index(Model model){List<Comment> comments = commentService.findAll();System.out.println(comments);model.addAttribute("comments",comments);return "index";}@GetMapping("/delete/{id}")public String delete(@PathVariable("id") int id, Model model){System.out.println("delete: "+id);commentService.deleteById(id);
//        return index(model);return "redirect:/index";}@PostMapping("/save")public String save(@RequestParam("content") String content,@RequestParam("author")  String author, Model model){Comment comment = new Comment(content, author);commentService.save(comment);return "redirect:/index";//        return this.index(model);}@GetMapping("update")public String updateHtml(@RequestParam("id") int id,Model model){Comment comment = commentService.findById(id);model.addAttribute("comment",comment);return "update";}@PostMapping("update")public String update(@RequestParam("id") int id,@RequestParam("content") String content,@RequestParam("author") String author,Model model){commentService.update(new Comment(id,content,author));return "redirect:/index";//        return this.index(model);}}

视图

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head><meta charset="UTF-8"><title>首页</title>
</head>
<body>
<form  action="save" method="post">评论内容 ：<input name="content" type="text">作者： <input name="author" type="text"><input type="submit" value="添加评论">
</form>
<table border="1"><tr><td>内容</td><td>作者</td><td>编辑</td><td>添加评论</td></tr><tr th:each="c:${comments}"><td th:text="${c.content}"></td><td th:text="${c.author}"></td><td ><a th:href="@{'/update?id=' + ${c.id}}">编辑</a></td><td ><a th:href="@{'/delete/' + ${c.id}}">删除</a></td></tr>
</table>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><title>编辑评论</title>
</head>
<body>
<form  action="/update" method="post"><input name="id" type="hidden" th:value="${comment.id}">评论内容 ：<input name="content" type="text" th:value="${comment.content}">作者： <input name="author" type="text" th:value="${comment.author}"><input type="submit" value="修改评论">
</form>
</body>
</html>

service：服务层

@Service
public class CommentService {@Autowiredprivate CommentMapper commentMapper;public List<Comment> findAll(){return  commentMapper.findAll();}public Comment findById(int id){return commentMapper.findById(id);}public int deleteById(int id){return commentMapper.deleteById(id);}public  int save(Comment comment){return commentMapper.save(comment);}public  int update(Comment comment){return commentMapper.update(comment);}}

mapper（dao）：持久层

@Mapper
public interface CommentMapper {@Select("select * from t_comment")public List<Comment> findAll();@Select("select * from t_comment where id=#{id}")public Comment findById(int id);@Delete("delete from t_comment where id=#{id}")public int deleteById(int id);@Insert("INSERT INTO t_comment(content , author) VALUES (#{content},  #{author})")public  int save(Comment comment);@Update("update t_comment set  content= #{content},author=#{author} where id=#{id}")public  int update(Comment comment);
}

entity层(model层，domain层、 bean)：对应数据库表，实体类

public class Comment {private int id;private int article_id;//关联的文章idprivate  String created;//评论时间private  String ip;//用户登录的ip地址private  String content;//评论内容private  String status;//评论状态private  String author;//评论 的用户名//构造方法、get、set
}