SpringMvc学习——整合SSM

1、创建项目结构

 2、导入坐标

<dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>5.2.10.RELEASE</version>
    </dependency>

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>5.2.10.RELEASE</version>
    </dependency>

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-test</artifactId>
      <version>5.2.10.RELEASE</version>
    </dependency>

    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>3.5.6</version>
    </dependency>

    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>1.3.0</version>
    </dependency>

    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.48</version>
    </dependency>

    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>druid</artifactId>
      <version>1.1.16</version>
    </dependency>

    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.12</version>
      <scope>test</scope>
    </dependency>

    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>3.1.0</version>
      <scope>provided</scope>
    </dependency>

    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-databind</artifactId>
      <version>2.9.0</version>
    </dependency>

3、创建配置文件

SpringConfig

//加载业务层
@Configuration
@ComponentScan({"com.itheima.service"})
@PropertySource("classpath:jdbc.properties") //必须有classpath前缀，否则无法加载资源文件
@Import({JdbcConfig.class,MybatisConfig.class})
@EnableTransactionManagement //开启事务注解
public class SpringConfig {

}

JdbcConfig

//读取datasource
public class JdbcConfig {

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

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

//添加事务管理器
@Bean
public PlatformTransactionManager transactionManager(DataSource dataSource){
    DataSourceTransactionManager ds = new DataSourceTransactionManager();
    ds.setDataSource(dataSource);
    return ds;
}

}

MybatisConfig

    //扫描资源
    @Bean
    public SqlSessionFactoryBean sqlSessionFactory(DataSource dataSource){
        SqlSessionFactoryBean factoryBean = new SqlSessionFactoryBean();
        factoryBean.setDataSource(dataSource);
        factoryBean.setTypeAliasesPackage("com.itheima.domain");
        return factoryBean;
    }

//    扫描映射,mybatis与spring整合
    @Bean
    public MapperScannerConfigurer mapperScannerConfigurer(){
        MapperScannerConfigurer msc = new MapperScannerConfigurer();
        msc.setBasePackage("com.itheima.dao");
        return msc;
    }

SpringMvcConfig

@Configuration
@ComponentScan("com.itheima.controller")
@EnableWebMvc
public class SpringMvcConfig {
}

ServletConfig

package com.itheima.config;
//web容器配置类


import org.springframework.web.filter.CharacterEncodingFilter;
import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;

import javax.servlet.Filter;

public class ServletConfig extends AbstractAnnotationConfigDispatcherServletInitializer {
    @Override
    protected Class<?>[] getRootConfigClasses() {
        return new Class[]{SpringConfig.class};
    }

    @Override
    protected Class<?>[] getServletConfigClasses() {
        return new Class[]{SpringMvcConfig.class};
    }

    @Override
    protected String[] getServletMappings() {
        return new String[]{"/"};
    }

    @Override
    protected Filter[] getServletFilters() {
        CharacterEncodingFilter filter = new CharacterEncodingFilter();
        filter.setEncoding("utf-8");
        return new Filter[]{filter};
    }
}

4、创建数据层dao，实体类domain

5、创建业务层，写方法，操作数据库

@Service
public class BookServiceImpl implements BookService {
//自动装配
    @Autowired
    private BookDao bookDao;

    @Override
    public boolean save(Book book) {
        bookDao.save(book);
        return true;
    }

    @Override
    public boolean update(Book book) {
        bookDao.update(book);
        return true;
    }

    @Override
    public boolean delete(Integer id) {
        bookDao.delete(id);
        return true;
    }

    @Override
    public Book getById(Integer id) {
        return bookDao.getById(id);
    }

    @Override
    public List<Book> getAll() {
        return bookDao.getAll();
    }
}

6、controller创作

/*
使用restful风格完成
*/
@RestController
@RequestMapping("/books")
public class BookController {

    //调用业务层接口，代替servlet
    @Autowired
    private BookService bookService;

    @PostMapping
    public boolean save(@RequestBody Book book) {
        return bookService.save(book);
    }

    @PutMapping
    public boolean update(@RequestBody Book book) {
        return bookService.update(book);
    }

    @DeleteMapping("/{id}")
    public boolean delete(@PathVariable Integer id) {
        return bookService.delete(id);
    }

    @GetMapping("/{id}")
    public Book getById(@PathVariable Integer id) {
        return bookService.getById(id);
    }

    @GetMapping
    public List<Book> getAll() {
        return bookService.getAll();
    }
}

7、添加事务

在SpringConfig JdbcConfig Service中进行配置

//业务层接口,注意添加文档注释
@Transactional //挂事务
public interface BookService {
    public boolean save(Book book);

    public boolean update(Book book);

    public boolean delete(Integer id);

    public Book getById(Integer id);

    public List<Book> getAll();
}

在配置SpringConfig时，配置资源文件需要加入前缀classpath:

否则会出现以下错误：Could not open ServletContext resource [/jdbc.properties]