SpringMVC整合MyBatis注解版本

作者:jiangzz 电话:15652034180 微信:jiangzz_wx 微信公众账号:jiangzz_wy

写久了Spring Boot快速构建,虽然能加速web开发进度,但是给人的感觉Spring Boot就是一个黑盒子,如果想搞明白Spring Boot的原理,每当用户集成一个框架的时候大家必须认真的看一下Spring Boot自动配置的源代码,否则项目不出错还好,一旦出错悲催了,Spring Boot就像是双刃剑有利有弊,个人建议在不熟练掌握Spring IOC/DI 、AOP常规注解和Servlet-3.0规范不建议使用Spring Boot,因为如果这些注解大家都不熟悉,使用Spring Boot 个人觉得是对自己的侮辱,因为在你不明白这些原理之前,就贸然的使用,个人觉得你学到的仅仅是皮毛,很难深入下去。

可参考:《SpringMVC整合MyBatis 基础版本》 查看传统整合.

Maven依赖

<!--AOP aspectjweaver 支持-->
<dependency>
  <groupId>org.aspectj</groupId>
  <artifactId>aspectjweaver</artifactId>
  <version>1.9.4</version>
</dependency>

<!-- webmvc配置-->
<dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-webmvc</artifactId>
  <version>5.1.7.RELEASE</version>
</dependency>

<!--访问RDBMS-MySQL依赖-->
<dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-jdbc</artifactId>
  <version>5.1.7.RELEASE</version>
</dependency>
<dependency>
  <groupId>org.mybatis</groupId>
  <artifactId>mybatis</artifactId>
  <version>3.5.1</version>
</dependency>
<dependency>
  <groupId>org.mybatis</groupId>
  <artifactId>mybatis-spring</artifactId>
  <version>2.0.1</version>
</dependency>
<dependency>
  <groupId>mysql</groupId>
  <artifactId>mysql-connector-java</artifactId>
  <version>5.1.47</version>
</dependency>

<!--Rest Support支持-->
<dependency>
  <groupId>com.fasterxml.jackson.core</groupId>
  <artifactId>jackson-databind</artifactId>
  <version>2.9.9</version>
</dependency>
<dependency>
  <groupId>com.fasterxml.jackson.dataformat</groupId>
  <artifactId>jackson-dataformat-xml</artifactId>
  <version>2.9.9</version>
</dependency>
<dependency>
  <groupId>com.fasterxml.jackson.module</groupId>
  <artifactId>jackson-module-parameter-names</artifactId>
  <version>2.9.9</version>
</dependency>
<!--文件上传-->
<dependency>
  <groupId>commons-fileupload</groupId>
  <artifactId>commons-fileupload</artifactId>
  <version>1.4</version>
</dependency>

<!--日志支持-->
<dependency>
  <groupId>org.slf4j</groupId>
  <artifactId>slf4j-api</artifactId>
  <version>1.7.26</version>
</dependency>
<dependency>
  <groupId>org.slf4j</groupId>
  <artifactId>slf4j-log4j12</artifactId>
  <version>1.7.26</version>
</dependency>
<dependency>
  <groupId>log4j</groupId>
  <artifactId>log4j</artifactId>
  <version>1.2.17</version>
</dependency>

<!-- 编译依赖 -->
<dependency>
  <groupId>javax.servlet</groupId>
  <artifactId>javax.servlet-api</artifactId>
  <version>3.0.1</version>
  <scope>provided</scope>
</dependency>

<dependency>
  <groupId>jstl</groupId>
  <artifactId>jstl</artifactId>
  <version>1.2</version>
</dependency>

<!--junit测试-->
<dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-test</artifactId>
  <version>5.1.7.RELEASE</version>
  <scope>test</scope>
</dependency>
<dependency>
  <groupId>junit</groupId>
  <artifactId>junit</artifactId>
  <version>4.12</version>
  <scope>test</scope>
</dependency>

配置web入口类,等价在web.xml配置

  • 方案1
package com.jiangzz;

import com.jiangzz.service.IUserService;
import org.springframework.beans.BeansException;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.web.WebApplicationInitializer;
import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;
import org.springframework.web.filter.CharacterEncodingFilter;
import org.springframework.web.servlet.DispatcherServlet;

import javax.servlet.*;
import java.util.EnumSet;

public class WebMVCWebApplicationInitializer implements WebApplicationInitializer {
    public void onStartup(ServletContext servletContext) throws ServletException {
       AnnotationConfigWebApplicationContext ctx = new AnnotationConfigWebApplicationContext();
       //设置Spring的父类Bean factory
       AnnotationConfigApplicationContext parent=new AnnotationConfigApplicationContext();
       parent.register(BeanFactoryConfig.class);
       parent.refresh();

       //注册mvc配置文件
       ctx.register(WebMvcConfig.class);
       ctx.setParent(parent);
       ctx.setServletContext(servletContext);
       ctx.refresh();

       ServletRegistration.Dynamic servlet = servletContext.addServlet("mvc", new DispatcherServlet(ctx));
       servlet.addMapping("/");
       servlet.setLoadOnStartup(1);

       CharacterEncodingFilter encode = new CharacterEncodingFilter();
       encode.setEncoding("utf-8");
       FilterRegistration.Dynamic filter = servletContext.addFilter("encode", encode);
       filter.addMappingForUrlPatterns(EnumSet.of(DispatcherType.FORWARD,DispatcherType.REQUEST),false,"/*");
    }
}
  • 方案2
package com.jiangzz;

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

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

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

    @Override
    protected String[] getServletMappings() {
        return new String[]{"/"};
    }
    //给DispatcherServlet添加filter
    @Override
    protected Filter[] getServletFilters() {
        CharacterEncodingFilter encodingFilter = new CharacterEncodingFilter();
        encodingFilter.setEncoding("utf-8");
        return  new Filter[]{encodingFilter};
    }
}
  • 方案3
package com.jiangzz;

import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;
import org.springframework.web.filter.CharacterEncodingFilter;
import org.springframework.web.servlet.support.AbstractDispatcherServletInitializer;

import javax.servlet.Filter;

public class MvcDispatcherServletInitializer extends AbstractDispatcherServletInitializer {
    @Override
    protected WebApplicationContext createServletApplicationContext() {
        AnnotationConfigWebApplicationContext ctx = new AnnotationConfigWebApplicationContext();
        ctx.register(WebMvcConfig.class);
        return ctx;
    }
    @Override
    protected String[] getServletMappings() {
        return new String[]{"/"};
    }
    @Override
    protected WebApplicationContext createRootApplicationContext() {
        AnnotationConfigWebApplicationContext ctx = new AnnotationConfigWebApplicationContext();
        ctx.register(BeanFactoryConfig.class);
        return ctx;
    }

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

配置 WebMvcConfig等价mvc-servlet.xml配置文件

package com.jiangzz;

import com.fasterxml.jackson.databind.util.Converter;
import com.fasterxml.jackson.module.paramnames.ParameterNamesModule;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.ComponentScans;
import org.springframework.context.annotation.Configuration;
import org.springframework.format.FormatterRegistry;
import org.springframework.format.datetime.DateFormatter;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.http.converter.xml.MappingJackson2XmlHttpMessageConverter;
import org.springframework.web.servlet.config.annotation.*;
import org.springframework.web.servlet.view.json.MappingJackson2JsonView;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;

@Configuration
@EnableWebMvc
@ComponentScans(
        value = {
                @ComponentScan("com.jiangzz.controller")
        }
)
public class WebMvcConfig implements WebMvcConfigurer {

    //构建视图解析器
    @Override
    public void configureViewResolvers(ViewResolverRegistry registry) {
        registry.enableContentNegotiation(new MappingJackson2JsonView());
        registry.jsp()
                .prefix("/WEB-INF/")
                .suffix(".jsp");
    }

    //日期输出格式化
    @Override
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {

        Jackson2ObjectMapperBuilder builder = new Jackson2ObjectMapperBuilder()
                .indentOutput(true)
                .dateFormat(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"))
                .modulesToInstall(new ParameterNamesModule());

        converters.add(new MappingJackson2HttpMessageConverter(builder.build()));
        converters.add(new MappingJackson2XmlHttpMessageConverter(builder.createXmlMapper(true).build()));

    }

    //解决静态资源加载问题
    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/static/**")
                .addResourceLocations("/static/")
                .setCachePeriod(3000);
    }

    //接收格式控制
    @Override
    public void addFormatters(FormatterRegistry registry) {
        registry.addFormatter(new DateFormatter("yyyy-MM-dd HH:mm:ss"));
    }

}

注意:不推荐使用WebMvcConfigurationSupport配置MVC 因为这个类对日期接收兼容不是特别好。

配置BeanFactoryConfig等价applicationContex.xml

package com.jiangzz;

import org.apache.ibatis.datasource.unpooled.UnpooledDataSource;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.annotation.MapperScan;
import org.mybatis.spring.annotation.MapperScans;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.ComponentScans;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.annotation.EnableTransactionManagement;

import javax.sql.DataSource;
import java.io.IOException;

@Configuration
@ComponentScans(
   value = {
           @ComponentScan("com.jiangzz.service")
   }
)
@MapperScans(
   value = {
           @MapperScan("com.jiangzz.dao")
   }
)
@EnableTransactionManagement
public class BeanFactoryConfig {

   @Bean
   public DataSource dataSource(){
           UnpooledDataSource dataSource = new UnpooledDataSource();
           dataSource.setDriver("com.mysql.jdbc.Driver");
           dataSource.setUrl("jdbc:mysql://localhost:3306/test");
           dataSource.setUsername("root");
           dataSource.setPassword("root");
           return dataSource;
   }

   @Bean
   public SqlSessionFactoryBean sqlSessionFactoryBean(DataSource dataSource) throws IOException {
           SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
           sqlSessionFactoryBean.setDataSource(dataSource);
           sqlSessionFactoryBean.setTypeAliasesPackage("com.jiangzz.entities");
           // 动态获取SqlMapper
           PathMatchingResourcePatternResolver pathResource = new PathMatchingResourcePatternResolver();
           sqlSessionFactoryBean.setMapperLocations(pathResource.getResources("classpath*:/mappers/*.xml"));
           return sqlSessionFactoryBean;
   }
   @Bean
   public PlatformTransactionManager transactionManager(DataSource dataSource){
           DataSourceTransactionManager transactionManager = new DataSourceTransactionManager();
           transactionManager.setDataSource(dataSource);
           return transactionManager;
   }
}

其他bean

  • User
public class User implements Serializable {
    private Integer id;
    private String name;
    private Date birthDay;
    //...
}
  • UserService
@Service
@Transactional(propagation = Propagation.SUPPORTS)
public class UserService implements IUserService {
    @Autowired
    private IUserDAO userDAO;
    @Override
    public User queryUserById(Integer id) {
        return userDAO.queryUserById(id);
    }
    @Transactional(propagation = Propagation.REQUIRED)
    @Override
    public void saveUser(User user) {
        userDAO.saveUser(user);
    }
}

  • IUserDAO
public interface IUserDAO {
    public User queryUserById(Integer id);
    public void saveUser(User user);
}
  • 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.jiangzz.dao.IUserDAO">
    <select id="queryUserById" resultType="User">
        select id,name,birthDay from t_user where id=#{id}
    </select>
    <insert id="saveUser" parameterType="User" keyProperty="id" useGeneratedKeys="true">
        insert into t_user(name,birthDay) values(#{name},#{birthDay})
    </insert>
</mapper>

小编寄语

SpringMVC 更多相关配置可以参考 https://docs.spring.io/spring/docs/current/spring-framework-reference/web.html ,如果这篇文章大家不去囫囵吞枣的阅读一遍,大家对于Spring MVC的掌握也仅限于网络上阉割的案例,所以本篇文章只是起到抛砖引玉的效果!

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