SSM学习总结与整合配置

已于 2024-10-13 21:36:54 修改
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文章标签： spring
于 2024-09-29 21:23:45 首次发布
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本文链接：https://blog.youkuaiyun.com/happybhs/article/details/142644041

Spring Framework Overview :: Spring Framework

整合所需的依赖项：

<?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.atguigu</groupId>  
  <artifactId>part04-ssm-integration</artifactId>  
  <version>1.0-SNAPSHOT</version>  
  <packaging>war</packaging>
  <properties>
    <spring.version>6.0.6</spring.version>
    <jakarta.annotation-api.version>2.1.1</jakarta.annotation-api.version>
    <jakarta.jakartaee-web-api.version>9.1.0</jakarta.jakartaee-web-api.version>
    <jackson-databind.version>2.15.0</jackson-databind.version>
    <hibernate-validator.version>8.0.0.Final</hibernate-validator.version>
    <mybatis.version>3.5.11</mybatis.version>
    <mysql.version>8.0.25</mysql.version>
    <pagehelper.version>5.1.11</pagehelper.version>
    <druid.version>1.2.8</druid.version>
    <mybatis-spring.version>3.0.2</mybatis-spring.version>
    <jakarta.servlet.jsp.jstl-api.version>3.0.0</jakarta.servlet.jsp.jstl-api.version>
    <logback.version>1.2.3</logback.version>
    <lombok.version>1.18.26</lombok.version>
    <maven.compiler.source>17</maven.compiler.source>
    <maven.compiler.target>17</maven.compiler.target>  
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> 
  </properties>
  <!--
     需要依赖清单分析:
        spring
          ioc/di
            spring-context / 6.0.6
            jakarta.annotation-api / 2.1.1  jsr250
          aop
            spring-aspects / 6.0.6
          tx
            spring-tx  / 6.0.6
            spring-jdbc / 6.0.6

        springmvc
           spring-webmvc 6.0.6
           jakarta.jakartaee-web-api 9.1.0
           jackson-databind 2.15.0
           hibernate-validator / hibernate-validator-annotation-processor 8.0.0.Final
         
        mybatis
           mybatis  / 3.5.11
           mysql    / 8.0.25
           pagehelper / 5.1.11

        整合需要
           加载spring容器 spring-web / 6.0.6
           整合mybatis   mybatis-spring x x
           数据库连接池    druid / x
           lombok        lombok / 1.18.26
           logback       logback/ 1.2.3
  -->

  <dependencies>
    <!--spring pom.xml依赖-->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>${spring.version}</version>
    </dependency>

    <dependency>
      <groupId>jakarta.annotation</groupId>
      <artifactId>jakarta.annotation-api</artifactId>
      <version>${jakarta.annotation-api.version}</version>
    </dependency>

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-aop</artifactId>
      <version>${spring.version}</version>
    </dependency>

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-aspects</artifactId>
      <version>${spring.version}</version>
    </dependency>

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-tx</artifactId>
      <version>${spring.version}</version>
    </dependency>

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>${spring.version}</version>
    </dependency>


    <!--
       springmvc
           spring-webmvc 6.0.6
           jakarta.jakartaee-web-api 9.1.0
           jackson-databind 2.15.0
           hibernate-validator / hibernate-validator-annotation-processor 8.0.0.Final
    -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>${spring.version}</version>
    </dependency>

    <dependency>
      <groupId>jakarta.platform</groupId>
      <artifactId>jakarta.jakartaee-web-api</artifactId>
      <version>${jakarta.jakartaee-web-api.version}</version>
      <scope>provided</scope>
    </dependency>

    <!-- jsp需要依赖! jstl-->
    <dependency>
      <groupId>jakarta.servlet.jsp.jstl</groupId>
      <artifactId>jakarta.servlet.jsp.jstl-api</artifactId>
      <version>${jakarta.servlet.jsp.jstl-api.version}</version>
    </dependency>

    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-databind</artifactId>
      <version>${jackson-databind.version}</version>
    </dependency>


    <!-- https://mvnrepository.com/artifact/org.hibernate.validator/hibernate-validator -->
    <dependency>
      <groupId>org.hibernate.validator</groupId>
      <artifactId>hibernate-validator</artifactId>
      <version>${hibernate-validator.version}</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.hibernate.validator/hibernate-validator-annotation-processor -->
    <dependency>
      <groupId>org.hibernate.validator</groupId>
      <artifactId>hibernate-validator-annotation-processor</artifactId>
      <version>${hibernate-validator.version}</version>
    </dependency>


    <!--
      mybatis
           mybatis  / 3.5.11
           mysql    / 8.0.25
           pagehelper / 5.1.11
    -->
    <!-- mybatis依赖 -->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>${mybatis.version}</version>
    </dependency>

    <!-- MySQL驱动 mybatis底层依赖jdbc驱动实现,本次不需要导入连接池,mybatis自带! -->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>${mysql.version}</version>
    </dependency>

    <dependency>
      <groupId>com.github.pagehelper</groupId>
      <artifactId>pagehelper</artifactId>
      <version>${pagehelper.version}</version>
    </dependency>

    <!-- 整合第三方特殊依赖 -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-web</artifactId>
      <version>${spring.version}</version>
    </dependency>

    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>${mybatis-spring.version}</version>
    </dependency>

    <!-- 日志 ， 会自动传递slf4j门面-->
    <dependency>
      <groupId>ch.qos.logback</groupId>
      <artifactId>logback-classic</artifactId>
      <version>${logback.version}</version>
    </dependency>

    <dependency>
      <groupId>org.projectlombok</groupId>
      <artifactId>lombok</artifactId>
      <version>${lombok.version}</version>
    </dependency>
    
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>druid</artifactId>
      <version>${druid.version}</version>
    </dependency>
    
  </dependencies>

</project>

日志功能:

resources/logback.xml

<?xml version="1.0" encoding="UTF-8"?>
<configuration debug="true">
    <!-- 指定日志输出的位置，ConsoleAppender表示输出到控制台 -->
    <appender name="STDOUT"
              class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            <!-- 日志输出的格式 -->
            <!-- 按照顺序分别是：时间、日志级别、线程名称、打印日志的类、日志主体内容、换行 -->
            <pattern>[%d{HH:mm:ss.SSS}] [%-5level] [%thread] [%logger] [%msg]%n</pattern>
            <charset>UTF-8</charset>
        </encoder>
    </appender>

    <!-- 设置全局日志级别。日志级别按顺序分别是：TRACE、DEBUG、INFO、WARN、ERROR -->
    <!-- 指定任何一个日志级别都只打印当前级别和后面级别的日志。 -->
    <root level="DEBUG">
        <!-- 指定打印日志的appender，这里通过“STDOUT”引用了前面配置的appender -->
        <appender-ref ref="STDOUT" />
    </root>

    <!-- 根据特殊需求指定局部日志级别，可也是包名或全类名。 -->
    <logger name="com.atguigu.mybatis" level="DEBUG" />

</configuration>

控制层配置（springMVC整合）

主要的功能：

1.实现Springmvc组件声明标准化接口WebMvcConfigurer 提供了各种组件对应的方法

2.添加配置类注解@Configuration

3.添加mvc复合功能开关@EnableWebMvc（handlerMapping，handlerAdapter和json转化器）

4.添加controller层扫描注解 

5.开启全局异常处理器,支持静态资源处理

6.拦截器

package com.bubu.config;

import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.*;


@EnableWebMvc
@Configuration
@ComponentScan({"com.bubu.controller"})
public class WebMvcJavaConfig implements WebMvcConfigurer {

    //静态资源解析器
    @Override
    public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
        configurer.enable();
    }

    //视图解析器
    @Override
    public void configureViewResolvers(ViewResolverRegistry registry) {
        registry.jsp("/WEB-INF/views/", ".jsp");
    }

    //拦截器
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        //registry.addInterceptor();
    }
}

业务层配置（aop,Service,Tx）

功能：

1. 声明@Configuration注解,代表配置类

2. 声明@EnableTransactionManagement注解,开启事务注解支持

3. 声明@EnableAspectJAutoProxy注解,开启aspect aop注解支持

4. 声明@ComponentScan("com.atguigu.service")注解,进行业务组件扫描

5. 声明transactionManager(DataSource dataSource)方法,指定具体的事务管理器

@Configuration
@EnableAspectJAutoProxy
@EnableTransactionManagement
public class ServiceJavaConfig {

    public TransactionManager transactionManager(DataSource dataSource){
        DataSourceTransactionManager dataSourceTransactionManager = new DataSourceTransactionManager();
        dataSourceTransactionManager.setDataSource();
        return dataSourceTransactionManager;
    }

}

持久层配置（mybatis）

整合方式一：（保留配置文件）

resource/mybatis-config.xml

不需要再写连接池

<?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>
    <properties resource="jdbc.properties"></properties>

    <settings>
        <!-- 开启驼峰式映射-->
        <setting name="mapUnderscoreToCamelCase" value="true"/>
        <!-- 开启logback日志输出-->
        <setting name="logImpl" value="SLF4J"/>
        <!--开启resultMap自动映射 -->
        <setting name="autoMappingBehavior" value="FULL"/>
    </settings>

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

    <plugins>
        <plugin interceptor="com.github.pagehelper.PageInterceptor">
            <!--
                helperDialect：分页插件会自动检测当前的数据库链接，自动选择合适的分页方式。
                你可以配置helperDialect属性来指定分页插件使用哪种方言。配置时，可以使用下面的缩写值：
                oracle,mysql,mariadb,sqlite,hsqldb,postgresql,db2,sqlserver,informix,h2,sqlserver2012,derby
                （完整内容看 PageAutoDialect） 特别注意：使用 SqlServer2012 数据库时，
                https://github.com/pagehelper/Mybatis-PageHelper/blob/master/wikis/zh/HowToUse.md#%E5%A6%82%E4%BD%95%E9%85%8D%E7%BD%AE%E6%95%B0%E6%8D%AE%E5%BA%93%E6%96%B9%E8%A8%80
             -->
            <property name="helperDialect" value="mysql"/>
        </plugin>
    </plugins>

</configuration>

连接池的配置类：

@PropertySource("classpath:jdbc.properties")
@Configuration
public class DataSourceJavaConfig {
    @Value("${jdbc.user}")
    private String user;

    @Value("${jdbc.password}")
    private String password;

    @Value("${jdbc.url}")
    private String url;

    @Value("${jdbc.driver}")
    private String driver;

    @Bean
    public DataSource dataSource() {
        DruidDataSource dataSource = new DruidDataSource();
        dataSource.setDriverClassName(driver);
        dataSource.setUrl(url);
        dataSource.setUsername(user);
        dataSource.setPassword(password);
        return dataSource;
    }
}

mybatis配置类：

@Configuration
public class MapperJavaConfig {

    @Bean
    public SqlSessionFactoryBean sessionFactory(DataSource dataSource) {
        SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
        //指定数据库连接池对象
        sqlSessionFactoryBean.setDataSource(dataSource);
        //指定外部的mybatis配置文件（springframework.core包下的）
        Resource resource = new ClassPathResource("mybatis-config.xml");
        sqlSessionFactoryBean.setConfigLocation(resource);
        return sqlSessionFactoryBean;
    }

    //将mapper代理对象加入到ioc容器中
    @Bean
    public MapperScannerConfigurer mapperScannerConfigurer() {
        MapperScannerConfigurer mapperScannerConfigurer = new MapperScannerConfigurer();
        mapperScannerConfigurer.setBasePackage("com.bubu.mapper");
        return mapperScannerConfigurer;//mapper接口和mapperxml共同所在的包
    }
}

整合方式二：（不使用mybatis-config.xml）

直接在创建SqlSessionFactoryBean时配置：

    @Bean
    public SqlSessionFactoryBean sessionFactory(DataSource dataSource) {
        SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
        //使用代码的形式，实现mybatis配置文件的功能

        /*
        <settings>
            <!-- 开启驼峰式映射-->
            <setting name="mapUnderscoreToCamelCase" value="true"/>
            <!-- 开启logback日志输出-->
            <setting name="logImpl" value="SLF4J"/>
            <!--开启resultMap自动映射 -->
            <setting name="autoMappingBehavior" value="FULL"/>
        </settings>
        * */
        org.apache.ibatis.session.Configuration configuration
                = new org.apache.ibatis.session.Configuration();
        configuration.setMapUnderscoreToCamelCase(true);
        configuration.setLogImpl(Slf4jImpl.class);
        configuration.setAutoMappingBehavior(AutoMappingBehavior.FULL);
        sqlSessionFactoryBean.setConfiguration(configuration);

        /*
        别名设置
    <typeAliases>
        <package name="com.bubu.pojo"/>
    </typeAliases>
        * */
        sqlSessionFactoryBean.setTypeAliasesPackage("com.bubu.pojo");

        /*
        插件
    <plugins>
        <plugin interceptor="com.github.pagehelper.PageInterceptor">
            <!--
                helperDialect：分页插件会自动检测当前的数据库链接，自动选择合适的分页方式。
                你可以配置helperDialect属性来指定分页插件使用哪种方言。配置时，可以使用下面的缩写值：
                oracle,mysql,mariadb,sqlite,hsqldb,postgresql,db2,sqlserver,informix,h2,sqlserver2012,derby
                （完整内容看 PageAutoDialect） 特别注意：使用 SqlServer2012 数据库时，
                https://github.com/pagehelper/Mybatis-PageHelper/blob/master/wikis/zh/HowToUse.md#%E5%A6%82%E4%BD%95%E9%85%8D%E7%BD%AE%E6%95%B0%E6%8D%AE%E5%BA%93%E6%96%B9%E8%A8%80
             -->
            <property name="helperDialect" value="mysql"/>
        </plugin>
    </plugins>
        * */
        PageInterceptor pageInterceptor = new PageInterceptor();
        Properties properties = new Properties();
        properties.setProperty("helperDialect", "mysql");
        pageInterceptor.setProperties(properties);
        sqlSessionFactoryBean.addPlugins(pageInterceptor);
        
        return sqlSessionFactoryBean;
    }

ssm配置类初始化和访问测试

加载配置类：

public class SpringIocInit extends AbstractAnnotationConfigDispatcherServletInitializer {
    //rootioc容器的配置类
    @Override
    protected Class<?>[] getRootConfigClasses() {
        return new Class[]{DataSourceJavaConfig.class, MapperJavaConfig.class, ServiceJavaConfig.class};
    }
    //webioc容器的配置类
    @Override
    protected Class<?>[] getServletConfigClasses() {
        return new Class[]{WebMvcJavaConfig.class};
    }

    //dispatcherServlet的拦截路径
    @Override
    protected String[] getServletMappings() {
        return new String[]{"/"};
    }
}

controller

@RestController
@RequestMapping("emp")
public class EmployeeController {

    @Autowired
    private EmployeeService employeeService;

    @GetMapping("find")
    public List<Employee> find(){
        List<Employee> employees = employeeService.findAll();
        System.out.println("employees: ");
        return employees;
    }
}

使用ssm整合对数据库进行增删改查

后端的实现:

controller:

@RestController
@RequestMapping("schedule")
@Slf4j //这是lombok提供的接口，logback是实现
public class ScheduleController {

    @Autowired
    private ScheduleService scheduleService;


    //接收参数，返回结果。
    @GetMapping("/{pageSize}/{currentPage}")
    public R page(@PathVariable(value = "pageSize") int pageSize,
                  @PathVariable(value = "currentPage") int currentPage){
        R r = scheduleService.page(pageSize,currentPage);
        log.info("查询的数据为：{}",r);
        return r;
    }

    @DeleteMapping("/{id}")
    public R delete(@PathVariable(value = "id") int id){
        R r = scheduleService.remove(id);
        return r;
    }

    @PostMapping
    public R save(@Validated @RequestBody Schedule schedule, BindingResult bindingResult){
        if(bindingResult.hasErrors()){
            return R.fail("不能保存");
        }
        R r = scheduleService.save(schedule);
        return r;
    }

    @PutMapping
    public R update(@Validated @RequestBody Schedule schedule, BindingResult bindingResult){
        if(bindingResult.hasErrors()){
            return R.fail("不能修改");
        }
        R r = scheduleService.update(schedule);
        return r;
    }

}

service:

@Service
public class ScheduleServiceImpl implements ScheduleService {

    @Autowired
    private ScheduleMapper scheduleMapper;

    @Override
    public R page(int pageSize, int currentPage) {
        //分页
        PageHelper.startPage(currentPage, pageSize);//sql limit x,y
        //查询
        List<Schedule> scheduleList = scheduleMapper.queryList();
        //分页数据装配
        PageInfo<Schedule> pageInfo = new PageInfo<>(scheduleList);
        //装配PageBean
        PageBean<Schedule> pageBean = new PageBean<>(currentPage,pageSize,pageInfo.getTotal(),pageInfo.getList());

        R ok = R.ok(pageBean);
        return ok;

    }

    @Override
    public R remove(int id) {
        int rows = scheduleMapper.deleteById(id);
        if(rows > 0){
            return R.ok(null);
        }
        return R.fail(null);
    }

    @Override
    public R save(Schedule schedule) {
        int row = scheduleMapper.insert(schedule);
        if(row > 0){
            return R.ok(null);
        }
        return R.fail(null);
    }

    @Override
    public R update(Schedule schedule) {
        if(schedule.getId() == null){
            return R.fail("核心参数为空");
        }
        int row = scheduleMapper.update(schedule);
        if(row > 0){
            return R.ok(null);
        }
        return R.fail(null);
    }
}

mapper:

<?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.atguigu.mapper.ScheduleMapper">

    <!--    List<Schedule> queryList();-->
    <select id="queryList" resultType="schedule">
        select * from schedule
    </select>

    <!--int deleteById(int id);-->
    <delete id="deleteById">
        delete from schedule where id = #{id}
    </delete>

    <!--    int insert(Schedule schedule);-->
    <insert id="insert">
        insert into schedule (title,completed) value (#{title},#{completed});
    </insert>

    <!--int update(Schedule schedule);-->
    <update id="update">
        update schedule set title = #{title} , completed = #{completed}
            where id = #{id}
    </update>
</mapper>

解决非同源访问问题(跨域访问注解)

在相应controller上添加注解:

@CrossOrigin

作用:允许其他源访问我们的controller,浏览器就不会拦截.

LanAndShuo
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