ssm整合笔记

于 2021-11-07 15:23:05 发布
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分类专栏： 学习 文章标签： java spring java-ee
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5、Spring MVC整合Mybatis

5.1开始

1.创建数据库

2.创建普通maven项目，添加web服务

3.导入包（pom.xml)

4.连接数据库

5.创建目录结构

6.配置所有的xml文件

7.pojo实体类

8.dao层的数据库操作（两个文件,文件名：bookMapper（接口）bookMapper.xml)

9.Service层（两个文件,文件名：bookService（接口）bookServiceImpl.xml )：Service层调用Dao层

10.Controller层（bookController（class类）控制与前端交互）

11.连接Tomcat，检查环境，增加lib目录，

12.进行测试

熟练后的正常ssm框架整合顺序：

Mybatis{

1.实体类

2.dao层Mapper接口主要定义增删查改之类的方法

3.dao层Mapper.xml主要实现增删查改，SQL语句

4.配置文件：applicationContext.xml（暂时不用，后边整合时用来导入 dao层service层mvc的配置文件）

​ database.properties（数据库配置文件）

​ mybatis-config.xml

5.service层Service接口和ServiceImpl类，业务层调用dao层

}

spring整合dao层：spring-dao.xml

spring整合service层：spring-service.xml

spring mvc{

1.添加Web支持

2.配置Web.xml

3.配置spring-mvc.xml

}

5.2 pom.xml

其中包括：junit,mysql,c3p0,mybatis,

​ mybatis-spring,servlet-api,

​ jsp-api,jstl,spring-jdbc

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>org.example</groupId>
    <artifactId>Lei_xiaoFan</artifactId>
    <version>1.0-SNAPSHOT</version>
    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.13.2</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.23</version>
        </dependency>
        <dependency>
            <groupId>com.mchange</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.5.5</version>
        </dependency>

        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.2</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/javax.servlet/servlet-api -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>servlet-api</artifactId>
            <version>2.5</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/javax.servlet.jsp/jsp-api -->
        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>jsp-api</artifactId>
            <version>2.2</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/javax.servlet/jstl -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.3.5</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.3.5</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.6</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.20</version>
            <scope>provided</scope>
        </dependency>
    </dependencies>
    <build>
        <resources>
            <resource>
                <directory>src/main/resources</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>true</filtering>
            </resource>

            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>false</filtering>
            </resource>
        </resources>

    </build>

</project>

5.3目录结构

[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-YzeSiGAg-1636269743677)(C:\Users\lei\AppData\Roaming\Typora\typora-user-images\image-20210904113831008.png)][外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-SDHBKCHL-1636269743681)(C:\Users\lei\AppData\Roaming\Typora\typora-user-images\image-20210904113905959.png)]

5.4 配置文件

applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans 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">

    <import resource="classpath:spring-dao.xml"/>
    <import resource="classpath:spring-service.xml"/>
    <import resource="classpath:spring-mvc.xml"/>
</beans>

mybatis-config.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">

<configuration>

    <typeAliases>
        <package name="com.kuang.pojo"/>
    </typeAliases>

    <mappers>
        <mapper class="com.kuang.dao.BookMapper"/>
    </mappers>

</configuration>

database.properties

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/ssmbuild?useSSL=true&useUnicode=true&characterEncoding=utf8&serverTimezone=Asia/Shanghai
jdbc.username=root
jdbc.password=123456

spring-dao.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans 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">
    
<!--关联数据库配置文件-->
    <context:property-placeholder location="classpath:database.properties"/>

<!--连接池：连接池类型为c3p0-->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${jdbc.driver}"/>
        <property name="jdbcUrl" value="${jdbc.url}"/>
        <property name="user" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
    </bean>
<!--sqlSessionFactory-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <!--绑定Mybatis配置文件-->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
    </bean>
<!--配置dao接口扫描包，可以实现Dao接口动态注入spring容器-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">

        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>

        <property name="basePackage" value="com.kuang.dao"/>
    </bean>
</beans>

spring-mvc.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:contex="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/mvc
       http://www.springframework.org/schema/mvc/spring-mvc.xsd
       http://www.springframework.org/schema/context
       https://www.springframework.org/schema/context/spring-context.xsd">
<!--注解驱动-->
    <mvc:annotation-driven/>
<!--静态资源过滤-->
    <mvc:default-servlet-handler/>
<!--扫描包-->
    <contex:component-scan base-package="com.kuang.controller"/>
<!--视图解析器-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <property name="suffix" value=".jsp"/>
    </bean>
</beans>

spring-serivce.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans 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">
<!--扫描service包-->
    <context:component-scan base-package="com.kuang.service"/>
<!--将所有业务注入spring-->
    <bean id="BookServiceImpl" class="com.kuang.service.BookServiceImpl">
        <property name="bookMapper" ref="bookMapper"/>
    </bean>
<!--声明式事务配置-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">

        <property name="dataSource" ref="dataSource"/>
    </bean>
<!--aop 事务支持-->
    
</beans>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         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">
    <!--DispatcherServlet：核心分发器-->
    <servlet>
        <servlet-name>springmvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:applicationContext.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
    <!--过滤器：乱码过滤-->
    <filter>
        <filter-name>encodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>utf-8</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>encodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    <!--Session过期时间-->
    <session-config>
        <session-timeout>15</session-timeout>
    </session-config>
</web-app>

5.5实体类

pojo（class类）

package com.kuang.pojo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@AllArgsConstructor
@NoArgsConstructor
public class Books {
    private int bookID;
    private String bookName;
    private int bookCounts;
    private String detail;

}

5.6Dao层文件

bookMapper（接口）

package com.kuang.dao;

import com.kuang.pojo.Books;
import org.apache.ibatis.annotations.Param;

import java.util.List;

public interface BookMapper {

    int addBook(Books books);

    int deleteBookById(@Param("bookId") int id);

    int updateBook(Books books);

    Books queryBookById(@Param("bookId") int id);

    List<Books> queryAllBook();

    Books queryBookByName(@Param("bookName") String bookName);
}

bookMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">

<mapper namespace="com.kuang.dao.BookMapper">

    <insert id="addBook" parameterType="Books">
        insert into ssmbuild.books (bookName,bookCounts,detail)
        values (#{bookName},#{bookCounts},#{detail});
    </insert>

    <delete id="deleteBookById" parameterType="int">
        delete from ssmbuild.books where bookID = #{bookId}
    </delete>

    <update id="updateBook" parameterType="Books">
        update ssmbuild.books
        set bookName=#{bookName},bookCounts=#{bookCounts},detail=#{detail}
        where bookID=#{bookID}
    </update>

    <select id="queryBookById" resultType="Books">
        select * from ssmbuild.books
        where bookID=#{bookId}
    </select>

    <select id="queryAllBook" resultType="Books">
        select * from ssmbuild.books
    </select>

    <select id="queryBookByName" resultType="Books">
        select * from ssmbuild.books
        where bookName=#{bookName}
    </select>
</mapper>

5.7Service层

BookService（接口）

package com.kuang.service;

import com.kuang.pojo.Books;

import java.util.List;

public interface BookService {
        int addBook(Books books);

        int deleteBookById(int id);

        int updateBook(Books books);

        Books queryBookById(int id);

        List<Books> queryAllBook();

        Books queryBookByName(String bookName);
}

BookServiceImol类实现BookService接口

package com.kuang.service;

import com.kuang.dao.BookMapper;
import com.kuang.pojo.Books;
import org.apache.ibatis.annotations.Param;

import java.util.List;

public class BookServiceImpl implements BookService{

    private BookMapper bookMapper;
    //业务层调用dao层，且可以增加一些操作
    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<Books> queryAllBook() {
        return bookMapper.queryAllBook();
    }

    public Books queryBookByName(String bookName){
        return bookMapper.queryBookByName(bookName);
    }
}

5.8Controller层

package com.kuang.controller;

import com.kuang.pojo.Books;
import com.kuang.service.BookService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;

import java.util.ArrayList;
import java.util.List;

@Controller
@RequestMapping("/book")
//controller调用service层
public class BookController {
    @Autowired
    @Qualifier("BookServiceImpl")
    private BookService bookService;

    @RequestMapping("/allBook")
    public String list(Model model){
        List<Books> list = bookService.queryAllBook();
        model.addAttribute("list",list);
        return "AllBook";
    }

    @RequestMapping("/toAddBook")
    public String toAddPaper(){
        return "AddBook";
    }

    @RequestMapping("/addBook")
    public String addBook(Books books){
        System.out.println("addBook->"+books);
        bookService.addBook(books);
        return "redirect:/book/allBook";
    }

    @RequestMapping("/delBook/{bookId}")
    public String delBook(@PathVariable("bookId") int id){
        System.out.println("delBook->"+id);
        bookService.deleteBookById(id);
        return "redirect:/book/allBook";
    }

    @RequestMapping("/toUpdateBook")
    public String toUpdateBook(int id,Model model){
        System.out.println("toUpdateBook->"+id);
        Books books = bookService.queryBookById(id);
        model.addAttribute("Qbook",books);
        System.out.println(books);
        return "UpdateBook";
    }

    @RequestMapping("/updateBook")
    public String updateBook(Books books){
        System.out.println("updateBook->"+books);
        bookService.updateBook(books);
        return "redirect:/book/allBook";
    }

    @RequestMapping("/queryBook")
    public  String queryBook(String queryBookName,Model model){
        Books books = bookService.queryBookByName(queryBookName);

        List<Books> list = new ArrayList<Books>();
        if(books!=null) list.add(books);
        model.addAttribute("list",list);
        return "AllBook";
    }
}

5.9测试

主要为了测试tomact是否连接成功以及程序是否能正常运行

浏览器中http://localhost:8080/hello测试

package com.kuang.controller;

import com.kuang.pojo.Books;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import java.util.List;

@Controller

public class LController {
    @RequestMapping("/hello")
    @ResponseBody
    public String Hello(){
        return "hello";
    }

}

5.10可能出现的错误

1.由于lib目录的jar包问题

[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-GjmzhEWz-1636269743684)(C:\Users\lei\AppData\Roaming\Typora\typora-user-images\image-20210904113436483.png)]

2. jsp问题

.jsp文件放在/WEB-INF/jsp下

但是有时候会出现访问不到404错误

可能的原因是out文件夹没有更新,有些时候这里会没有jsp的文件夹，请上百度，

其中一种解决方案：[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-bt9Cc773-1636269743687)(C:\Users\lei\AppData\Roaming\Typora\typora-user-images\image-20210904113540549.png)]

如果实在解决不了，可以将下边的jsp文件夹直接复制到这里，也是可以运行的。

[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-1YoL7PKG-1636269743689)(C:\Users\lei\AppData\Roaming\Typora\typora-user-images\image-20210904113644386.png)]

3. SQL问题

遇到错误可以 使用Test测试是否是SQL语句的问题。

例子：

当我进行删除一本书的操作时出现了错误，说book ID找不到

但是再此之前的所有页面都可以进入，于是我进行了test测试

import com.kuang.pojo.Books;
import com.kuang.service.BookService;
import org.junit.Test;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class MyTest {
    @Test
    public void test(){
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        BookService bookServiceImpl = (BookService) context.getBean("BookServiceImpl");
        bookServiceImpl.deleteBookById(3);
    }
}

还是出错，可以确定时SQL语句那里的问题

(img-1YoL7PKG-1636269743689)]

3. SQL问题

遇到错误可以 使用Test测试是否是SQL语句的问题。

例子：

当我进行删除一本书的操作时出现了错误，说book ID找不到

但是再此之前的所有页面都可以进入，于是我进行了test测试

import com.kuang.pojo.Books;
import com.kuang.service.BookService;
import org.junit.Test;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class MyTest {
    @Test
    public void test(){
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        BookService bookServiceImpl = (BookService) context.getBean("BookServiceImpl");
        bookServiceImpl.deleteBookById(3);
    }
}

还是出错，可以确定时SQL语句那里的问题

重新运行后，发现删除成功，问题解决。

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