java ssm框架笔记 java ssm框架搭建

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Python数据分析 2023-06-29 20:16:07

文章标签 java ssm框架笔记 mybatis spring ssm java 文章分类 Java 后端开发

SSM框架搭建(IDEA)

文章目录

SSM框架搭建(IDEA)
前言
一、创建Maven工程

1. 创建一个Maven工程，导入依赖
2. 创建配置文件

二、整合Mybatis

1.创建数据库配置文件
2.实体类创建
3. Dao层/Mapper层创建
4. Service层创建

三、整合Spring

1. 配置spring-dao.xml
2. 配置spring-service.xml

四、整合SpringMVC

1. 添加web框架
2. 配置spring-mvc.xml

五、大整合
总结

前言

找工作并没有想象的那么简单，现在开始夯实基础，从头做起。也方便我以后翻阅。

一、创建Maven工程

1. 创建一个Maven工程，导入依赖

<?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>com.qll</groupId>
    <artifactId>ssmbuild</artifactId>
    <version>1.0-SNAPSHOT</version>
    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.34</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/com.mchange/c3p0 -->
        <dependency>
            <groupId>com.mchange</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.5.2</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>servlet-api</artifactId>
            <version>2.5</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.2</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis-spring -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.2</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.2.12.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>3.0.6.RELEASE</version>
        </dependency>
    </dependencies>

    <!--静态资源导出，防止配置文件等无法正常导出-->
    <build>
        <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>false</filtering>
            </resource>
            <resource>
                <directory>src/main/resources</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>false</filtering>
            </resource>
        </resources>
    </build>
</project>

2. 创建配置文件

在resource文件夹下创建下列文件：
写一下文件头雏形
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">
       
</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>

</configuration>

二、整合Mybatis

1.创建数据库配置文件

database.properties： xxx处为连接数据库的名称，mysql8.0以上需要在url字段添加serverTimezone=UTC或者serverTimezone=Asia/shanghai字段。
注意： 不要配置文件key不要用易与系统重复的字段。

mydriver=com.mysql.jdbc.Driver
myurl=jdbc:mysql://localhost:3306?ssmbuild/useSSL=true&useUnicode=true&character=utf-8
myusername=root
mypassword=root

mybatis-config.xml： 继续填充我们的mybatis.xml文件。数据源配置将交给spring完成。

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

2.实体类创建

在pojo包下创建books实体类。这里偷懒使用了lombok注解，该注解能够自动创建getter和setter方法和有参无参构造。
在创建类的属性的时候最好和数据库的字段名一致，能够映射，避免后续的一些麻烦。

package com.qll.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 details;

}

3. Dao层/Mapper层创建

BookMapper.java： 定义 BookMapper.java 抽象接口即可。具体SQL语句放在BookMapper.xml配置文件中实现。

package com.qll.dao;

import com.qll.pojo.Books;
import org.apache.ibatis.annotations.Param;
import java.util.List;

public interface BookMapper {

    // 增
    int insertBook(Books book);
    // 删
    int deleteBookByID(@Param("bookID") int id);
    // 改
    int updataBook(Books book);
    // 查
    Books queryBookByID(@Param("bookID") int id);
    List<Books> queryBooks();
}

BookMapper.xml： 实现具体的SQL语句。
文件最好放在同一目录下，或者放在resource文件夹下但保证相同前缀包名，打包时会被整合到一起的。注意： namespace别忘记写！

<?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.qll.dao.BookMapper">
    <insert id="insertBook" 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="updataBook" 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="queryBooks" resultType="Books">
        select * from ssmbuild.books
    </select>
</mapper>

4. Service层创建

Service层简单来讲就是对于Dao层的进一步封装，调用Dao层实现一些业务逻辑。
BookService.java：

package com.qll.service;

import com.qll.pojo.Books;
import java.util.List;

public interface BookService {
    // 增
    int insertBook(Books book);
    // 删
    int deleteBookByID( int id);
    // 改
    int updataBook(Books book);
    // 查
    Books queryBookByID( int id);
    List<Books> queryBooks();
}

BookServiceImp.java：

package com.qll.service.serviceImp;

import com.qll.dao.BookMapper;
import com.qll.pojo.Books;
import com.qll.service.BookService;
import org.apache.ibatis.annotations.Param;
import org.springframework.stereotype.Service;
import java.util.List;

@Service
public class BookServiceImp implements BookService {
	@Autowired
    private BookMapper bookMapper;
    public void setBookMapper(BookMapper bookMapper) {
        this.bookMapper = bookMapper;
    }
 
    public int insertBook(Books book) {
        return bookMapper.insertBook(book);
    }
    public int deleteBookByID(int id) {
        return bookMapper.deleteBookByID(id);
    }
    public int updataBook(Books book) {
        return bookMapper.updataBook(book);
    }
    public Books queryBookByID(int id) {
        return bookMapper.queryBookByID(id);
    }
    public List<Books> queryBooks() {
        return bookMapper.queryBooks();
    }
}

三、整合Spring

1. 配置spring-dao.xml

springdao无非要做的就是连接数据池，配置SqlSessionFactory，实现Dao层的自动扫描注入到Spring容器。

<?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">

    <!--关联数据库文件-->
    <context:property-placeholder location="classpath:database.properties" />

    <!--连接池-->
    <bean id="dataSource" class="org.apache.commons.dbcp2.BasicDataSource">
        <property name="driverClassName" value="${mydriver}"/>
        <property name="url" value="${myurl}" />
        <property name="username" value="${myusername}" />
        <property name="password" value="${mypassword}" />
    </bean>

    <!--SQLsessionFactory-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
    </bean>

    <!--配置Dao自动扫描，动态Dao注入到spring容器-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!--注入SQLsessionFactory-->
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" />
        <!--注入Dao-->
        <property name="basePackage" value="com.qll.dao" />
    </bean>
</beans>

2. 配置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
        https://www.springframework.org/schema/context/spring-context.xsd">
    <!--扫描service下的包-->
    <context:component-scan base-package="com.qll.service" />

    <!--将我们的所有业务，注入spring，我们可以直接使用注解-->
    <!--<bean id="BookServiceImp" class="com.qll.service.BookServiceImp">-->
        <!--<property name="bookMapper" ref="bookMapper" />-->
    <!--</bean>-->

    <!--声明式事务管理-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <!--注入数据源-->
        <property name="dataSource" ref="dataSource" />
    </bean>

    <!--aop事务支持-->
</beans>

四、整合SpringMVC

1. 添加web框架

web.xml： 配置完成后基本无需在进行后续的修改，所有请求都被核心分发器所接管。

<?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">

    <!--dispatch-->
    <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>

    <!--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-->
    <session-config>
        <session-timeout>15</session-timeout>
    </session-config>
</web-app>

2. 配置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: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/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 />
    <!--静态过滤-->
    <mvc:default-servlet-handler />
    <!--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>
    <!--扫描包-->
    <context:component-scan base-package="com.qll.controller" />
</beans>

五、大整合

applicationContext.xml： 将三个配置文件做最后统一的整合。

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

总结

这样我们就对SSM框架有了一个完整的搭建，后续只需要对其进行功能上的增加，进行小小的更改即可。

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