SSM integration (integrated configuration)

  in other words ： The first spring、springmvc、mybatis All configurations are integrated （ I have taken notes before , This time it can be integrated ）

The steps are as follows ：

 jdbcConfig：

package com.itheima.config;

import com.alibaba.druid.pool.DruidDataSource;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;

import javax.sql.DataSource;

public class jdbcConfig {
    /**
     *   Complete attribute assignment by annotation 
     *
     *       Be careful ： The annotation value here is obtained by jdbc.properties Obtained in the file , So don't forget to add @PropertySource("#") Note form 
     */

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

    /**
     *   Define a method ： Used to obtain the third party to be managed bean/ object 
     */


    @Bean
    public DataSource dataSource(){

        // 1、new  The third party bean/ object 
        DruidDataSource dataSource =new DruidDataSource();

        // 2、 To a third party bean/ Object property assignment 
        dataSource.setDriverClassName(driver);
        dataSource.setUrl(url);
        dataSource.setUsername(username);
        dataSource.setPassword(password);

        // 3、 Put the third party bean/ Object is returned to the method 
        return dataSource;
    }

}

MybatisConfig：

package com.itheima.config;

import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.mapper.MapperScannerConfigurer;
import org.springframework.context.annotation.Bean;
import javax.sql.DataSource;

public class MybatisConfig {

    @Bean
    public SqlSessionFactoryBean sqlSessionFactory(DataSource dataSource){  //  The purpose of parameter passing is to handle referential dependencies DataSource object 
        // 1、new SqlSessionFactoryBean  object 
        SqlSessionFactoryBean sqfb =new SqlSessionFactoryBean();
        // 2、 Integrate mybatis The core configuration information of 
        sqfb.setTypeAliasesPackage("com.itheima.domain");
        sqfb.setDataSource(dataSource); //  The referential dependency is mybatis Core profile settings jdbc Connection information 

        return sqfb;
    }

    /*
<mappers>
        <!--  load sql The mapping file  -->
        <package name="com.itheima.dao"></package>
    </mappers>
     */

    /**
     *   The mapperScannerConfigurer Method new Coming out MapperScannerConfigurer Object is equivalent to integration mybatis The above information in the core configuration file of 
     */
    @Bean
    public MapperScannerConfigurer mapperScannerConfigurer(){
        // 1、new MapperScannerConfigurer object 
        MapperScannerConfigurer mp =new MapperScannerConfigurer();
        // 2、 load sql The mapping file 
        mp.setBasePackage("com.itheima.dao");
//  amount to mybatis Load in sql The mapping file  UserMapper.xml, It's just... Here UserMapper The proxy interface is directly annotated 
// form 
        //  Written sql sentence , No, UserMapper.xml, So it is loaded directly into dao Data under the package UserMapper,
// It's just... Here BookDao
        return mp;
    }

}

ServletContainersInitConfig：

package com.itheima.config;

import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;
import org.springframework.web.servlet.support.AbstractDispatcherServletInitializer;

/**
 *   tell tomcat Server load springmvc Container environment 
 */
public class ServletContainersInitConfig extends AbstractDispatcherServletInitializer {

    //  load springmvc Container configuration method 
    protected WebApplicationContext createServletApplicationContext() {
        AnnotationConfigWebApplicationContext ctx = new AnnotationConfigWebApplicationContext();
        ctx.register(SpringMvcConfig.class);
        return ctx;
    }

    //  Set to attribute all client requests to springmvc management 
    protected String[] getServletMappings() {
        return new String[]{"/"};
    }

    //  load spring Container configuration method 
    protected WebApplicationContext createRootApplicationContext() {
        AnnotationConfigWebApplicationContext ctx = new AnnotationConfigWebApplicationContext();
        ctx.register(SpringConfig.class);
        return ctx;
    }

    //  Chinese code scrambling 

    //  filter 

    //  These two methods can be used in the project development by turning notes 
}

SpringConfig： 

package com.itheima.config;

import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;
import org.springframework.context.annotation.PropertySource;

@Configuration  // spring Container notes 
@ComponentScan({"com.itheima.service"})
@PropertySource({"jdbc.properties"})    //  Configuration is loaded jdbc.properties file   Use $ Symbol to get data 
// @PropertySource({"classpath:jdbc.properties"})   //  If you report an error in the above annotation form, use this annotation instead of the above 
@Import({jdbcConfig.class,MybatisConfig.class})
public class SpringConfig {
}

SpringMvcConfig：

package com.itheima.config;


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

@Configuration
@ComponentScan({"com.itheima.controller"})  //  scanning controller Does the package contain bean annotation 
@EnableWebMvc   // json Data format annotation 
public class SpringMvcConfig {
}

jdbc.properties：

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/ssm_db?useSSL=false
jdbc.username=root
jdbc.password=123456