【SSM】整合开发

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文章目录

1.ssm整合过程
- 1.1步骤
- 1.2 Spring整合SpringMVC的问题
2.准备工作
- 2.1 添加依赖
- 2.2 创建数据库
3.相关配置
4.测试整合效果

1.ssm整合过程

1.1步骤

1Spring整合MyBatis
通过service层dao层都注入到Spring容器。
2引入配置SpringMVC
把Controller层注入到SpringMVC容器。
3让web项目启动时自动读取spring配置文件来创建spring容器
可以使用ContextLoadListener来实现Spring容器的创建

1.2 Spring整合SpringMVC的问题

在这里插入图片描述
1为什么需要Spring, SpringMVC两个容器
因为Controller层放在SpringMVC容器中才能发挥其作用才能处理请求Service层放在Spring容器才能发挥其作用才能使用声明式事务。

2SpringMVC容器的Controller如何获取Spring容器的Service对象
Spring容器相当于父容器而SpringMVC相当于子容器子容器除了能使用自己容器中的对象还可以使用父容器中的对象。

3如何让两个容器发生父子关系
通过ContextLoaderListener。
a当服务器启动后会创建ServletContext
bContextLoaderListener在监听创建ServletContext后会经过读取配置文件位置找到配置文件位置初始化IOC等操作创建IOC容器。
c将IOC容器放进ServletContext中
dDispatcher启动时创建完SpringMVC容器后会从ServletContext中获取Spring容器对象并设置其为父对象这样子容器就能获取到父容器中的bean。

在这里插入图片描述

2.准备工作

在这里插入图片描述

2.1 添加依赖

 <!--Spring-context-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.1.9.RELEASE</version>
        </dependency>
        <!--AOP相关依赖-->
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.8.13</version>
        </dependency>
        <!-- spring-jdbc -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.1.9.RELEASE</version>
        </dependency>
        <!-- mybatis整合到Spring的整合包 -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.4</version>
        </dependency>
        <!--mybatis依赖-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.4</version>
        </dependency>
        <!--log4j依赖打印mybatis日志-->
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>
        <!--分页查询pagehelper-->
        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper</artifactId>
            <version>4.0.0</version>
        </dependency>

        <!--mysql驱动-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.47</version>
        </dependency>
        <!-- druid数据源 -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.16</version>
        </dependency>

        <!-- junit -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>
        <!-- spring整合junit的依赖 -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>5.1.9.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.12</version>
            <scope>provided</scope>
        </dependency>


        <!-- servlet依赖 -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
            <scope>provided</scope>
        </dependency>
        <!--jsp依赖 -->
        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>jsp-api</artifactId>
            <version>2.1</version>
            <scope>provided</scope>
        </dependency>
        <!--springmvc的依赖-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.1.9.RELEASE</version>
        </dependency>

        <!-- jackson帮助进行json转换-->
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.9.0</version>
        </dependency>

        <!--commons文件上传如果需要文件上传功能需要添加本依赖-->
        <dependency>
            <groupId>commons-fileupload</groupId>
            <artifactId>commons-fileupload</artifactId>
            <version>1.4</version>
        </dependency>

2.2 创建数据库

CREATE DATABASE /*!32312 IF NOT EXISTS*/`mybatis_db` /*!40100 DEFAULT CHARACTER SET utf8 */;
USE `mybatis_db`;
DROP TABLE IF EXISTS `user`;
CREATE TABLE `user` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `username` varchar(50) DEFAULT NULL,
  `age` int(11) DEFAULT NULL,
  `address` varchar(50) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8;
insert  into `user`(`id`,`username`,`age`,`address`) values (1,'UZI',19,'上海'),(2,'PDD',25,'上海');

3.相关配置

3.1 整合Spring和Mybatis

spring的核心配置文件
【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"
       xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:aop="http://www.springframework.org/schema/aop"
       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 http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/aop https://www.springframework.org/schema/aop/spring-aop.xsd">

    <!--组件扫描排除controller其他的放入spring-->
    <context:component-scan base-package="com.sdnu">
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"></context:exclude-filter>
    </context:component-scan>

    <!--读取properties文件-->
    <context:property-placeholder location="classpath:jdbc.properties"></context:property-placeholder>
    <!--创建连接池注入容器-->
    <bean class="com.alibaba.druid.pool.DruidDataSource" id="dataSource">
        <property name="url" value="${jdbc.url}"></property>
        <property name="username" value="${jdbc.username}"></property>
        <property name="password" value="${jdbc.password}"></property>
        <property name="driverClassName" value="${jdbc.driver}"></property>
    </bean>
    <!--spring整合mybatis后控制的创建获取SqlSessionFactory的对象-->
    <bean class="org.mybatis.spring.SqlSessionFactoryBean" id="sessionFactory">
        <!--配置连接池-->
        <property name="dataSource" ref="dataSource"></property>
        <!--配置mybatis配置文件的路径-->
        <property name="configLocation" value="classpath:mybatis-config.xml"></property>
    </bean>

    <!--mapper扫描配置扫描到的mapper对象会被注入Spring容器中-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer" id="mapperScannerConfigurer">
        <property name="basePackage" value="com.sdnu.dao"></property>
    </bean>

    <!--开启aop注解支持-->
    <aop:aspectj-autoproxy></aop:aspectj-autoproxy>

    <!--声明式事务相关配置-->
    <bean class="org.springframework.jdbc.datasource.DataSourceTransactionManager" id="transactionManager">
        <property name="dataSource" ref="dataSource"></property>
    </bean>
    <tx:annotation-driven transaction-manager="transactionManager"></tx:annotation-driven>

</beans>

【jdbc.properties】

jdbc.url=jdbc:mysql://localhost:3306/mybatis_db?useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC
jdbc.driver=com.mysql.jdbc.Driver
jdbc.username=root
jdbc.password=root

【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>
    <settings>
        <!--指定使用log4j打印Mybatis日志-->
        <setting name="logImpl" value="LOG4J"/>
    </settings>
    <!--配置别名包放实体类类名叫User写mapper配置时应该写全类名但配置完这个后就只用写User了-->
    <typeAliases>
        <package name="com.sdnu.domain"></package>
    </typeAliases>
    <plugins>
        <!-- 注意分页助手的插件配置在通用mapper之前 -->
        <plugin interceptor="com.github.pagehelper.PageHelper">
            <!-- 指定方言 -->
            <property name="dialect" value="mysql"/>
        </plugin>
    </plugins>
</configuration>

【log4j.properties】

### direct log messages to stdout ###
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n

### direct messages to file mylog.log ###
log4j.appender.file=org.apache.log4j.FileAppender
log4j.appender.file.File=c:/mylog.log
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n

### set log levels - for more verbose logging change 'info' to 'debug' ###

log4j.rootLogger=debug, stdout

3.2 引入SpringMVC

【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: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 https://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd">
    <!--
         SpringMVC只扫描controller包即可
     -->
    <context:component-scan base-package="com.sdnu.controller"/>
    <!-- 解决静态资源访问问题如果不加mvc:annotation-driven会导致无法访问handler-->
    <mvc:default-servlet-handler/>
    <!--解决响应乱码-->
    <mvc:annotation-driven>
        <mvc:message-converters>
            <bean class="org.springframework.http.converter.StringHttpMessageConverter">
                <constructor-arg value="utf-8"/>
            </bean>
        </mvc:message-converters>
    </mvc:annotation-driven>


    <!--配置视图解析器  前后端不分离项目使用-->
    <!--    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" id="viewResolver">
            &lt;!&ndash;要求拼接的前缀&ndash;&gt;
            <property name="prefix" value="/WEB-INF/page/"></property>
            &lt;!&ndash;要拼接的后缀&ndash;&gt;
            <property name="suffix" value=".jsp"></property>
        </bean>-->

    <!--配置拦截器-->
    <!--    <mvc:interceptors>
    
            <mvc:interceptor>
                &lt;!&ndash;
                &ndash;&gt;
                <mvc:mapping path="/**"/>
                &lt;!&ndash;配置排除拦截的路径&ndash;&gt;
                <mvc:exclude-mapping path="/"/>
                &lt;!&ndash;配置拦截器对象注入容器&ndash;&gt;
                <bean class=""></bean>
            </mvc:interceptor>
        </mvc:interceptors>-->

    <!--
          文件上传解析器
          注意id 必须为 multipartResolver
          如果需要上传文件时可以放开相应配置
      -->
    <!--<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">-->
    <!--&lt;!&ndash; 设置默认字符编码 &ndash;&gt;-->
    <!--<property name="defaultEncoding" value="utf-8"/>-->
    <!--&lt;!&ndash; 一次请求上传的文件的总大小的最大值单位是字节&ndash;&gt;-->
    <!--<property name="maxUploadSize" value="#{1024*1024*100}"/>-->
    <!--&lt;!&ndash; 每个上传文件大小的最大值单位是字节&ndash;&gt;-->
    <!--<property name="maxUploadSizePerFile" value="#{1024*1024*50}"/>-->
    <!--</bean>-->
</beans>

修改【web.xml】

 <servlet>
        <servlet-name>DispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <!--
            为DispatcherServlet提供初始化参数的
            设置springmvc配置文件的路径
                name是固定的必须是contextConfigLocation
                value指的是SpringMVC配置文件的位置
         -->
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:spring-mvc.xml</param-value>
        </init-param>
        <!--
            指定项目启动就初始化DispatcherServlet
         -->
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>DispatcherServlet</servlet-name>
        <!--
             /           表示当前servlet映射除jsp之外的所有请求包含静态资源
             *.do        表示.do结尾的请求路径才能被SpringMVC处理(老项目会出现)
             /*          表示当前servlet映射所有请求包含静态资源,jsp不应该使用其配置DispatcherServlet
         -->
        <url-pattern>/</url-pattern>
    </servlet-mapping>


    <!--乱码处理过滤器由SpringMVC提供-->
    <!-- 处理post请求乱码 -->
    <filter>
        <filter-name>CharacterEncodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <!-- name固定不变value值根据需要设置 -->
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>CharacterEncodingFilter</filter-name>
        <!-- 所有请求都设置utf-8的编码 -->
        <url-pattern>/*</url-pattern>
    </filter-mapping>

3.3 spring整合入web项目

【web.xml】

    <!--配置spring的配置文件路径-->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:applicationContext.xml</param-value>
    </context-param>
    <!--配置监听器可以再应用被部署的时候创建spring容器-->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

4.测试整合效果

在这里插入图片描述

[UserController.java]

package com.sdnu.controller;

import com.sdnu.domain.User;
import com.sdnu.service.UserService;
import org.apache.ibatis.annotations.Param;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;

@RestController
public class UserController {
    @Autowired
    UserService userService;
    @GetMapping("/user/{id}")
    public User findById(@PathVariable("id") Integer id){
        User user = userService.findById(id);
        return user;
    }
}

[UserDao.java]

package com.sdnu.dao;

import com.sdnu.domain.User;

public interface UserDao {
    User findById(Integer id);
}

[User.java]

package com.sdnu.domain;

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

@Data
@NoArgsConstructor
@AllArgsConstructor
public class User {
    private Integer id;
    private String username;
    private Integer age;
    private String address;
}

[UserServiceImpl.java]

package com.sdnu.service.Impl;

import com.sdnu.dao.UserDao;
import com.sdnu.domain.User;
import com.sdnu.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class UserServiceImpl implements UserService {
    @Autowired
    private UserDao userDao;
    @Override
    public User findById(Integer id) {
        return userDao.findById(id);
    }
}

[UserService.java]

package com.sdnu.service;

import com.sdnu.domain.User;

public interface UserService {
    User findById(Integer id);
}

[UserDao.xml]

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.sdnu.dao.UserDao">
    <select id="findById" resultType="com.sdnu.domain.User">
        select * from user where id = #{id}
    </select>
</mapper>

加入tomcat插件
[pom.xml]

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.tomcat.maven</groupId>
                <artifactId>tomcat7-maven-plugin</artifactId>
                <version>2.2</version>
                <configuration>
                    <port>80</port>
                    <path>/</path>
                    <uriEncoding>utf-8</uriEncoding>
                </configuration>
            </plugin>
        </plugins>
    </build>