• java框架----SSM快速整合教程


    参考于遇见狂神说视频以及学习笔记

    环境要求

    • MySQL 5.7.19
    • Tomcat 9
    • Maven 3.6

    项目目录

    在这里插入图片描述

    整合步骤

    1. 搭建数据库

    CREATE DATABASE `ssmbuild`;
    USE `ssmbuild`;
    DROP TABLE IF EXISTS `books`;
    CREATE TABLE `books` (
    `bookID` INT(10) NOT NULL AUTO_INCREMENT COMMENT '书id',
    `bookName` VARCHAR(100) NOT NULL COMMENT '书名',
    `bookCounts` INT(11) NOT NULL COMMENT '数量',
    `detail` VARCHAR(200) NOT NULL COMMENT '描述',
    KEY `bookID` (`bookID`)
    ) ENGINE=INNODB DEFAULT CHARSET=utf8
    INSERT  INTO `books`(`bookID`,`bookName`,`bookCounts`,`detail`)VALUES
    (1,'Java',1,'从入门到放弃'),
    (2,'MySQL',10,'从删库到跑路'),
    (3,'Linux',5,'从进门到进牢');
    
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    2. 创建maven项目,并改为web项目

    在这里插入图片描述

    3. 编写pom文件,导入整合需要的依赖

    <?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>ssm_build</artifactId>
        <version>1.0-SNAPSHOT</version>
    
        <dependencies>
            <!--Junit-->
            <dependency>
                <groupId>junit</groupId>
                <artifactId>junit</artifactId>
                <version>4.12</version>
            </dependency>
            <!--数据库驱动-->
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <version>5.1.47</version>
            </dependency>
            <!-- 数据库连接池 -->
            <dependency>
                <groupId>com.mchange</groupId>
                <artifactId>c3p0</artifactId>
                <version>0.9.5.2</version>
            </dependency>
            <!--Servlet - JSP -->
            <dependency>
                <groupId>javax.servlet</groupId>
                <artifactId>servlet-api</artifactId>
                <version>2.5</version>
            </dependency>
            <dependency>
                <groupId>javax.servlet.jsp</groupId>
                <artifactId>jsp-api</artifactId>
                <version>2.2</version>
            </dependency>
            <dependency>
                <groupId>javax.servlet</groupId>
                <artifactId>jstl</artifactId>
                <version>1.2</version>
            </dependency>
            <!--Mybatis-->
            <dependency>
                <groupId>org.mybatis</groupId>
                <artifactId>mybatis</artifactId>
                <version>3.5.2</version>
            </dependency>
            <dependency>
                <groupId>org.mybatis</groupId>
                <artifactId>mybatis-spring</artifactId>
                <version>2.0.2</version>
            </dependency>
            <!--Spring-->
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-webmvc</artifactId>
                <version>5.1.9.RELEASE</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-jdbc</artifactId>
                <version>5.1.9.RELEASE</version>
            </dependency>
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <version>1.16.10</version>
            </dependency>
        </dependencies>
    <!--    设置Maven资源过滤,否则读取不到配置文件-->
        <build>
            <resources>
                <resource>
                    <directory>src/main/java</directory>
                    <includes>
                        <include>**/*.properties
                        **/*.xml</include>
                    </includes>
                    <filtering>false</filtering>
                </resource>
                <resource>
                    <directory>src/main/resources</directory>
                    <includes>
                        <include>**/*.properties
                        **/*.xml</include>
                    </includes>
                    <filtering>false</filtering>
                </resource>
            </resources>
        </build>
    </project>
    
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    4.分层建立目录结构,编写Mybatis层

    • 建立db.properties文件,配置数据库连接信息
    jdbc.driver=com.mysql.jdbc.Driver
    jdbc.url=jdbc:mysql://localhost:3306/ssmbuild?useSSL=false&useUnicode=true&characterEncoding=utf8
    jdbc.username=root
    jdbc.password=123456
    
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    • 编写实体类(POJO)
    package com.wzl.pojo;
    
    import lombok.AllArgsConstructor;
    import lombok.Data;
    import lombok.NoArgsConstructor;
    
    /**
     * @Description
     * @autor wzl
     * @date 2022/8/25-21:18
     */
    @Data
    @AllArgsConstructor
    @NoArgsConstructor
    public class Books {
        private int bookID;
        private String bookName;
        private int bookCounts;
        private String detail;
    }
    
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    • 编写Mapper接口(Dao层)
    package com.wzl.dao;
    
    import com.wzl.pojo.Books;
    import org.apache.ibatis.annotations.Param;
    
    import java.util.List;
    
    /**
     * @Description
     * @autor wzl
     * @date 2022/8/25-21:34
     */
    public interface BookMapper {
        //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 bookId需要与sql中的bookId变量名一致
        Books queryBookById(int id);
    
        //查询全部的书
        List<Books> queryAllBook();
    
        //查询书籍
        Books queryBookByName(String bookName);
    }
    
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    • 编写接口对应的 Mapper.xml 文件。
    <?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.wzl.dao.BookMapper">
    
        <insert id="addBook" parameterType="books">
            insert into books(bookName,bookCounts,detail)
            values (#{bookName},#{bookCounts},#{detail})
        </insert>
    
        <delete id="deleteBookById" parameterType="int">
            delete from books where bookID=#{book}
        </delete>
    
        <update id="updateBook" parameterType="books">
            update books set bookName=#{bookName},bookCounts=#{bookCounts},detail=#{detail}
            where bookID=#{bookID}
        </update>
    
        <select id="queryBookById" resultType="books">
            select * from books where bookID=#{book}
        </select>
    
        <select id="queryAllBook" resultType="books">
            select * from books
        </select>
    
        <select id="queryBookByName" resultType="books">
            select * from books where bookName=#{book}
        </select>
    </mapper>
    
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    • 编写Service层的接口和实现类
    package com.wzl.service;
    
    import com.wzl.pojo.Books;
    import org.apache.ibatis.annotations.Param;
    
    import java.util.List;
    
    /**
     * @Description
     * @autor wzl
     * @date 2022/8/25-21:57
     */
    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 bookId需要与sql中的bookId变量名一致
        Books queryBookById(int id);
    
        //查询全部的书
        List<Books> queryAllBook();
    
        //根据名字查书籍
        Books queryBookByName(String bookName);
    }
    
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    package com.wzl.service;
    
    import com.wzl.dao.BookMapper;
    import com.wzl.pojo.Books;
    
    import java.util.List;
    
    /**
     * @Description
     * @autor wzl
     * @date 2022/8/25-21:58
     */
    public class BookServiceImpl implements BookService {
    
        //组合Dao
        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<Books> queryAllBook() {
            return bookMapper.queryAllBook();
        }
    
        public Books queryBookByName(String bookName) {
            return bookMapper.queryBookByName(bookName);
        }
    }
    
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    编写Spring层

    • 编写Spring整合Mybatis的相关的配置文件( 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
    https://www.springframework.org/schema/context/spring-context.xsd">
        <!-- 配置整合mybatis -->
        <!-- 1.关联数据库文件 -->
        <context:property-placeholder location="classpath:db.properties"/>
        <!-- 2.数据库连接池 -->
        <!--数据库连接池
        dbcp 半自动化操作 不能自动连接
        c3p0 自动化操作(自动的加载配置文件 并且设置到对象里面)
        -->
        <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
            <!-- 配置连接池属性 -->
            <property name="driverClass" value="${jdbc.driver}"/>
            <property name="jdbcUrl" value="${jdbc.url}"/>
            <property name="user" value="${jdbc.username}"/>
            <property name="password" value="${jdbc.password}"/>
            <!-- c3p0连接池的私有属性 -->
            <property name="maxPoolSize" value="30"/>
            <property name="minPoolSize" value="10"/>
            <!-- 关闭连接后不自动commit -->
            <property name="autoCommitOnClose" value="false"/>
            <!-- 获取连接超时时间 -->
            <property name="checkoutTimeout" value="10000"/>
            <!-- 当获取连接失败重试次数 -->
            <property name="acquireRetryAttempts" value="2"/>
        </bean>
        <!-- 3.配置SqlSessionFactory对象 -->
        <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
            <!--        注入数据库连接池-->
            <property name="dataSource" ref="dataSource"/>
            <!--        配置Mybatis全局配置文件:mybatis-config.xml-->
            <property name="configLocation" value="classpath:mybatis-config.xml"/>
    
        </bean>
        <!--    配置扫描Dao接口包,动态实现Dao接口注入到spring容器中,获取是sqlsession对象-->
        <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
            <!-- 注入sqlSessionFactory -->
            <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
            <!-- 给出需要扫描Dao接口包 -->
            <property name="basePackage" value="com.wzl.dao"/>
        </bean>
    </beans>
    
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    • spring整合service层(编写spring-service.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相关的bean,对于service层-->
        <context:component-scan base-package="com.wzl.service"/>
    
        <bean id="BookServiceImpl" class="com.wzl.service.BookServiceImpl">
            <property name="bookMapper" ref="bookMapper"/>
        </bean>
    
    <!--    配置事务管理器-->
        <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
    <!--        注入数据库连接池-->
            <property name="dataSource" ref="dataSource"/>
        </bean>
    </beans>
    
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    编写spring-mvc层

    • 编写web.xml文件
    <?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">
    
        <welcome-file-list>
            <welcome-file>index.jsp</welcome-file>
        </welcome-file-list>
    
        <!--    DispatcherServlet-->
        <servlet>
            <servlet-name>DispatcherServlet</servlet-name>
            <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
            <init-param>
                <param-name>contextConfigLocation</param-name>
                <!--            这里加载的是总的配置文件-->
                <param-value>classpath:applicationContext.xml</param-value>
            </init-param>
            <load-on-startup>1</load-on-startup>
        </servlet>
    
        <servlet-mapping>
            <servlet-name>DispatcherServlet</servlet-name>
            <url-pattern>/</url-pattern>
        </servlet-mapping>
    
        <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>/*
        
    
        
    
        
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    • 编写spring-mvc.xml文件
    <?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"
           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
    https://www.springframework.org/schema/mvc/spring-mvc.xsd">
    
        <!--    配置SpringMvc,对于controller层-->
    
        <!--    1.开启SpringMvc注解驱动-->
        <mvc:annotation-driven/>
        <!-- 2.静态资源默认servlet配置-->
        <mvc:default-servlet-handler/>
    
        <!--3.配置jsp显示viewResolver配置-->
        <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
            <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
            <property name="prefix" value="/WEB-INF/jsp/"/>
            <property name="suffix" value=".jsp"/>
        </bean>
            <!-- 4.扫描web相关的bean-->
            <context:component-scan base-package="com.wzl.controller"/>
    </beans>
    
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    • 编写总体配置文件(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="spring-dao.xml"/>
        <import resource="spring-service.xml"/>
        <import resource="spring-mvc.xml"/>
    </beans>
    
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    编写Controller层

    package com.wzl.controller;
    
    import com.wzl.pojo.Books;
    import com.wzl.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;
    
    /**
     * @Description
     * @autor wzl
     * @date 2022/8/26-9:15
     */
    @Controller
    @RequestMapping("/book")
    public class BookController {
        //1.查询全部书籍
    
        @Autowired
        @Qualifier("BookServiceImpl")
        private BookService bookService;
    
        //查询所有书籍
        @RequestMapping("/allBook")
        public String list(Model model){
            List<Books> books = bookService.queryAllBook();
            model.addAttribute("books",books);
            return "allBook";
        }
    
        //跳转到增加书籍页面
        @RequestMapping("/toAddBook")
        public String toAddBook(){
            return "addBook";
        }
    
        //增加书籍
        @RequestMapping("/addBook")
        public String addBook(Books books){
            System.out.println(books);
            int i = bookService.addBook(books);
            if(i>0){
                System.out.println("新增书籍成功");
            }
            return "redirect:/book/allBook";
        }
    
        //跳转到修改书籍页面
        @RequestMapping("/toUpdateBook")
        public String toUpdateBook(Model model,int id){
            Books books = bookService.queryBookById(id);
            System.out.println("书籍为:"+books);
            model.addAttribute("book",books);//将待修改的数据传递到前端
            return "updateBook";
        }
    
        //修改书籍
        @RequestMapping("/updateBook")
        public String updateBook(Books books){
            System.out.println("updateBook==>"+books);
            int i = bookService.updateBook(books);
            if(i>0){
                System.out.println("修改成功");
            }
    
            return "redirect:/book/allBook";
        }
    
        //删除书籍
        @RequestMapping("delete/{bookId}")
        public String deleteBook(@PathVariable("bookId") int id){
            int i = bookService.deleteBookById(id);
            if(i>0){
                System.out.println("删除成功");
            }
            return "redirect:/book/allBook";
        }
    
        //查询书籍
        //queryBookName与前端的name属性一致
        @RequestMapping("/queryBook")
        public String queryBook(String queryBookName,Model model){
            System.out.println("要查询的书籍名:"+queryBookName);
    
            Books book = bookService.queryBookByName(queryBookName.trim());
            System.out.println("查询后的书籍信息为:"+book);
            List<Books> books=new ArrayList<Books>();
            //如果没有找到这本书
            if(book==null){
                books = bookService.queryAllBook();
                model.addAttribute("error","没有找到这本书");
            }
            books.add(book);
            model.addAttribute("books",books);
            return "allBook";
        }
    }
    
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  • 原文地址:https://blog.csdn.net/qq_38716929/article/details/126668378