2021最新 SSM（Spring+Spring MVC，java分布式系统面试题

xmlns=“http://www.springframework.org/schema/beans”

xmlns:xsi=“http://www.w3.org/2001/XMLSchema-instance”

xsi:schemaLocation="http://www.springframework.org/schema/beans

http://www.springframework.org/schema/beans/spring-beans.xsd

">

[](

)4、Mybatis层编写

---

1. 数据库配置文件 database.properties

jdbc.driver=com.mysql.jdbc.Driver

如果使用的是MySql8.0+，增加一个时区的配置；serverTimezone=Asia/Shanghai

jdbc.url=jdbc:mysql://localhost:3306/springmvc?useSSL=true&useUnicode=true&characterEncoding=utf8

jdbc.username=root

jdbc.password=root

注意：database.properties文件中不能有空格！

2. 关联数据库

3. 编写MyBatis的核心配置文件

4. [](

)编写数据库对应的实体类 pojo.Books

使用Lombok插件

@Data

@AllArgsConstructor

@NoArgsConstructor

public class Books {

private Integer bookID;

private String bookName;

private Integer bookCounts;

private String detail;

}

5. 编写Dao层 的 Mapper接口！

public interface BookMapper {

//增加一本书

int addBook(Books books);

//删除一本书

int deleteBookById(@Param(“bookId”) int id);

//更新一本书

int updateBook(Books books);

//查询一本书

Books queryBookById(@Param(“bookId”) int id);

//查询全部的书

List queryAllBook();

}

6. 编写接口对应的 Mapper.xml 文件。需要导入MyBatis的包；

insert into springmvc.books(bookName, bookCounts, detail)

values (#{bookName},#{bookCounts},#{detail})

delete from springmvc.books where bookID = #{bookId}

update springmvc.books

set bookName=#{bookName},bookCounts=#{bookCounts},detail=#{detail}

where bookID = #{bookID};

select * from springmvc.books

where bookID = #{bookId}

select * from springmvc.books

7. [](

)编写Service层的接口和实现类

接口：

public interface BookService {

//增加一本书

int addBook(Books books);

//删除一本书

int deleteBookById(int id);

//更新一本书

int updateBook(Books books);

//查询一本书

Books queryBookById(int id);

//查询全部的书

List queryAllBook();

}

​ 实现类：

public class BookServiceImpl implements BookService {

//调用dao层的操作，设置一个set接口，方便Spring管理

private BookMapper bookMapper;

public void setBookMapper(BookMapper bookMapper) {

this.bookMapper = bookMapper;

}

public int addBook(Books books) {

return bookMapper.addBook(books);

}

public int deleteBookById(int id) {

return bookMapper.deleteBookById(id);

}

public int updateBook(Books books) {

return bookMapper.updateBook(books);

}

public Books queryBookById(int id) {

return bookMapper.queryBookById(id);

}

public List queryAllBook() {

return bookMapper.queryAllBook();

}

}

[](

)OK，到此，底层需求操作编写完毕！

[](

)5、Spring层

---

1. [](

)配置Spring整合MyBatis，这里数据源使用c3p0连接池；

2. [](

)编写Spring整合Mybatis的相关的配置文件；spring-dao.xml

xmlns=“http://www.springframework.org/schema/beans”

xmlns:xsi=“http://www.w3.org/2001/XMLSchema-instance”

xmlns:context=“http://www.springframework.org/schema/context”

xsi:schemaLocation="http://www.springframework.org/schema/beans

http://www.springframework.org/schema/beans/spring-beans.xsd

http://www.springframework.org/schema/context

http://www.springframework.org/schema/context/spring-context.xsd

">

注意：数据库错误，建议使用spring默认连接池

3. Spring整合service层

xmlns=“http://www.springframework.org/schema/beans”

xmlns:xsi=“http://www.w3.org/2001/XMLSchema-instance”

xmlns:context=“http://www.springframework.org/schema/context”

xsi:schemaLocation="http://www.springframework.org/schema/beans

http://www.springfram

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ework.org/schema/beans/spring-beans.xsd

http://www.springframework.org/schema/context

http://www.springframework.org/schema/context/spring-context.xsd

">

[](

)Spring层搞定！

[](

)6、SpringMVC层

---

1. web.xml

web项目创建方式：

​ 右键项目 --> Add frameworks Support --> Java EE --> Web Application --> 选中，然后点击OK，就创建成功了！

xmlns:xsi=“http://www.w3.org/2001/XMLSchema-instance”

xsi:schemaLocation=“http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd”

version=“4.0”>

springmvc

org.springframework.web.servlet.DispatcherServlet

contextConfigLocation

classpath:applicationContext.xml

1

springmvc

/

encodingFilter

org.springframework.web.filter.CharacterEncodingFilter

encoding

utf-8

encodingFilter

/*

15

2. spring-mvc.xml

xmlns=“http://www.springframework.org/schema/beans”

xmlns:xsi=“http://www.w3.org/2001/XMLSchema-instance”

xmlns:context=“http://www.springframework.org/schema/context”

xmlns:mvc=“http://www.springframework.org/schema/mvc”

xsi:schemaLocation="http://www.springframework.org/schema/beans

http://www.springframework.org/schema/beans/spring-beans.xsd

http://www.springframework.org/schema/context

http://www.springframework.org/schema/context/spring-context.xsd

http://www.springframework.org/schema/mvc

http://www.springframework.org/schema/mvc/spring-mvc.xsd">

mvc:annotation-driven/

mvc:default-servlet-handler/

3. Spring配置整合文件，applicationContext.xml

xmlns=“http://www.springframework.org/schema/beans”

xmlns:xsi=“http://www.w3.org/2001/XMLSchema-instance”

xsi:schemaLocation="http://www.springframework.org/schema/beans

http://www.springframework.org/schema/beans/spring-beans.xsd

">

[](

)配置文件，暂时结束！Controller 和 视图层编写

[](

)7、Controller 和 视图层编写

---

1. BookController 类编写 ， 方法一：查询全部书籍

@Controller

@RequestMapping("/book")

public class BookController {

@Autowired

@Qualifier(“BookServiceImpl”)

private BookService bookService;

@RequestMapping("/allBook")

public String list(Model model) {

List list = bookService.queryAllBook();

model.addAttribute(“list”, list);

return “allBook”;

}

}

2. 编写首页 index.jsp

<%@ page language=“java” contentType=“text/html; charset=UTF-8” pageEncoding=“UTF-8” %>

点击进入列表页

3. 书籍列表页面 allbook.jsp

<%@ taglib prefix=“c” uri=“http://java.sun.com/jsp/jstl/core” %>

<%@ page contentType=“text/html;charset=UTF-8” language=“java” %>

书籍列表 —— 显示所有书籍

新增

书籍编号 书籍名字 书籍数量 书籍详情 操作

${book.getBookID()}