JAVAEE第六次作业-SpringMVC+Spring+mybatis 项目实践

JAVAEE第六次作业-SpringMVC+Spring+mybatis 项目实践

注：由于对SSM框架很陌生，配置文件部分自己弄了很久也不清楚，配置文件部分内容参考了罗付强同学的博客https://www.cnblogs.com/lfq4588/p/13094221.html

一、任务

使用ssm重新开发计科院新闻网站

二、创建SSM框架环境

2.1 新建Maven项目

方便对需要用的包进行管理

Maven导入需要用到的包

   
   
       junit
       junit
       4.12
   
   
   
       mysql
       mysql-connector-java
       5.1.47
   
   
   
       com.mchange
       c3p0
       0.9.5.2
   

   
   
       javax.servlet
       servlet-api
       2.5
   
   
       javax.servlet.jsp
       jsp-api
       2.2
   
   
       javax.servlet
       jstl
       1.2
   

   
   
       org.mybatis
       mybatis
       3.5.2
   
   
       org.mybatis
       mybatis-spring
       2.0.2
   

   
   
       org.springframework
       spring-webmvc
       5.1.9.RELEASE
   
   
       org.springframework
       spring-jdbc
       5.1.9.RELEASE
   

2.2 添加Web环境支持

2.3 创建SSM项目文件结构

• Controller：用于将service的结果展示在前端页面
• mapper：mabatis映射接口，编写SQL语句
• pojo：实体类
• service：业务层，和Controller进行交互

2.4 编写配置文件代码

1. applicationContext.xml

2. springmvc.xml

三、完成SSM项目代码

编写代码之前，可以将MVC Model2中的Web资源拷贝到该项目，代码部分也可以简单修改转换为ssm的形式

3.1 pojo实体类编写

此处用到了lombok工具，实体类就不用编写复杂的get set方法了

//用户实体类
@Data
@AllArgsConstructor
@NoArgsConstructor
public class UserInfo {
    String uName="";    //用户名
    String uPwd="";     //用户密码
}

//新闻实体类
@Data
@AllArgsConstructor
@NoArgsConstructor
public class News {

    private String newsId;
    private String title;
    private String newsContent;
    private String author;
    private String newsDate;

}

3.2 编写mapper数据库映射

1. UserMapper

@Repository
public interface UserMapper {
    //判断当前账号是否正确
    @Select("select * from users_info where UID = #{UID} AND UPWD = #{UPWD}")
    UserInfo isUserExist(UserInfo userInfo);
}

2. NewsMapper

@Repository
public interface NewsMapper {

    //增加新闻
    @Insert("insert into users.news (NewID,Title, NewsContent, Author, NewsDate)\n" +
            "        values (#{NewID},#{Title},#{NewsContent},#{Author},#{NewsDate});")
    int addNews(News news);

    //删除新闻
    @Delete(" delete from users.news where NewID = #{NewID};")
    int deleteNewsById(@Param("NewID") String newId);

    //修改新闻
    @Update("update users.news\n" +
            "set Title=#{Title},NewsContent=#{NewsContent},Author=#{Author},NewsDate=#{NewsDate}\n" +
            "where NewID = #{NewID};")
    int updateNewsById(News news);

    //查询一条新闻
    @Select("select * from users.news where NewID = #{NewID};")
    News queryNewsById(@Param("NewID") String newId);

    //查询所有新闻
    @Select("select * from users.news;")
    List queryAllNews();
}

3.3 编写service的实现

1. NewsServiceImpl

@Service("NewsService")
public class NewsServiceImpl implements NewsService {
    //service调dao层  组合mapper
    @Autowired
    private NewsMapper newsMapper;

    public void setNewsMapper(NewsMapper newsMapper) {
        //可增加其他代码
        this.newsMapper = newsMapper;
    }

    public boolean addNews(News news) {

        int rows = newsMapper.addNews(news);
        if (rows > 0) {
            return true;
        } else {
            return false;
        }
    }

    public boolean deleteNewsById(String newId) {
        int rows = newsMapper.deleteNewsById(newId);
        if (rows > 0) {
            return true;
        } else {
            return false;
        }
    }

    public boolean updateNewsById(News news) {
        int rows = newsMapper.updateNewsById(news);
        if (rows > 0) {
            return true;
        } else {
            return false;
        }
    }

    public News queryNewsById(String newId) {
        return newsMapper.queryNewsById(newId);
    }

    public List queryAllNews() {
        return newsMapper.queryAllNews();
    }
}

2. UserServiceImpl

@Service("UserService")
public class UserServiceImpl implements UserService {
    //service调dao层  组合mapper
    @Autowired
    private UserMapper userMapper;

    public void setUserMapper(UserMapper userMapper) {
        this.userMapper = userMapper;
    }

    //账号结果是否正确
    public boolean isUserExist(UserInfo userInfo) {
        UserInfo quertRes = userMapper.isUserExist(userInfo);
        if (quertRes == null) {
            return false;
        }

        if (quertRes.getUID() != null && quertRes.getUPWD() != null) {
            return true;
        } else {
            return false;
        }
    }
}

3.4 编写controller

1. UserController

@Controller
public class UserController {

    @Autowired
    private UserService userService;

    @RequestMapping("/login")
    public void login(HttpServletRequest request, HttpServletResponse response) throws IOException {
        String username = request.getParameter("username");
        String password = request.getParameter("password");

        UserInfo user = new UserInfo();
        user.setUID(username);
        user.setUPWD(password);

        boolean b = userService.isUserExist(user);
        if (b) {
            response.sendRedirect("page/index.html");
        } else {
            response.sendRedirect("index.jsp");
        }
    }
}

2. NewsController（由于内容太多，只展示部分）

@RequestMapping("/viewNew")
public void viewNew(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {
    request.setCharacterEncoding("UTF-8");
    response.setCharacterEncoding("UTF-8");
    response.setContentType("text/html; charset=UTF-8");

    String newsID = request.getParameter("newid");
    System.out.println(newsID);

    News news = null;
    news = newsService.queryNewsById(newsID);

    System.out.println(news.getNewID());
    System.out.println(news.getNewsContent());
    System.out.println(news.getNewsDate());
    System.out.println(news.getAuthor());

    request.setAttribute("news", news);
    //转发到content.jsp
    request.getRequestDispatcher("NewsContent.jsp").forward(request, response);
}

四、效果实现

效果与MVC Model2作业类似，但是SSM实现起来更方便了

1. 删除编号为7的新闻

成功实现删除功能

2. 添加新闻，点击左上方按钮即可

3. 跳转到新闻管理表单

4. 点写完内容点击更新

5. 成功添加新闻

6. 点击编辑按钮开始修改新闻内容

7. 修改部分内容

成功完成修改

8. 点击查看新闻即可跳转到新闻详细界面中

9. 官网效果实现

跳转后页面

五、码云地址

码云地址: https://gitee.com/Jason98/JavaEE-Course