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SpringBoot填坑系列---XML方式配置数据库

本次只是简单的运用SpringBoot搭建框架，对其原理并不做深入的探究

1.POM文件

  1 <?xml version="1.0" encoding="UTF-8"?>
  2 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  3     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  4     <modelVersion>4.0.0</modelVersion>
  5 
  6     <groupId>com.hxyz</groupId>
  7     <artifactId>media</artifactId>
  8     <version>0.0.1-SNAPSHOT</version>
  9     <packaging>jar</packaging>
 10 
 11     <name>media</name>
 12     <description>Demo project for Spring Boot</description>
 13 
 14     <parent>
 15       <groupId>org.springframework.boot</groupId>
 16       <artifactId>spring-boot-starter-parent</artifactId>
 17       <version>1.4.0.RELEASE</version>
 18       <relativePath/> <!-- lookup parent from repository -->
 19    </parent>
 20    
 21    <properties>
 22       <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 23       <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
 24       <java.version>1.8</java.version>
 25       <mybatis.version>3.2.2</mybatis.version>
 26    </properties>
 27    
 28    <dependencies>
 29     <dependency>
 30         <groupId>org.springframework.boot</groupId>
 31         <artifactId>spring-boot-starter-web</artifactId>
 32     </dependency>
 33     <dependency>
 34         <groupId>mysql</groupId>
 35         <artifactId>mysql-connector-java</artifactId>
 36     </dependency>
 37     <!-- mybatis -->
 38     <dependency>
 39         <groupId>org.mybatis</groupId>
 40         <artifactId>mybatis</artifactId>
 41         <version>${mybatis.version}</version>
 42     </dependency>
 43     <dependency>
 44         <groupId>org.mybatis</groupId>
 45         <artifactId>mybatis-spring</artifactId>
 46         <version>1.2.0</version>
 47     </dependency>
 48     
 49     <dependency>
 50             <groupId>org.springframework.boot</groupId>
 51             <artifactId>spring-boot-starter</artifactId>
 52         </dependency>
 53         <dependency>
 54             <groupId>org.springframework.data</groupId>
 55             <artifactId>spring-data-commons</artifactId>
 56         </dependency>
 57         <!-- connection pool -->
 58         <dependency>
 59             <groupId>org.springframework</groupId>
 60             <artifactId>spring-jdbc</artifactId>
 61         </dependency>
 62         <dependency>
 63             <groupId>org.apache.tomcat</groupId>
 64             <artifactId>tomcat-jdbc</artifactId>
 65         </dependency>
 66         <dependency>
 67             <groupId>mysql</groupId>
 68             <artifactId>mysql-connector-java</artifactId>
 69         </dependency>
 70        <dependency>
 71             <groupId>com.fasterxml.jackson.core</groupId>
 72             <artifactId>jackson-databind</artifactId>
 73             <version>2.7.0</version>
 74         </dependency>
 75         <dependency>
 76             <groupId>net.sf.json-lib</groupId>
 77             <artifactId>json-lib</artifactId>
 78             <version>2.4</version>
 79             <classifier>jdk15</classifier>
 80         </dependency>
 81         <dependency>
 82             <groupId>com.fasterxml.jackson.module</groupId>
 83             <artifactId>jackson-module-jaxb-annotations</artifactId>
 84             <version>2.7.0</version>
 85         </dependency>
 86          <dependency>
 87             <groupId>net.sf.json-lib</groupId>
 88             <artifactId>json-lib</artifactId>
 89             <version>2.4</version>
 90             <classifier>jdk15</classifier>
 91         </dependency>
 92         <dependency>
 93             <groupId>dom4j</groupId>
 94             <artifactId>dom4j</artifactId>
 95             <version>1.1</version>
 96         </dependency>
 97         <dependency>
 98             <groupId>org.apache.commons</groupId>
 99             <artifactId>commons-lang3</artifactId>
100             <version>3.1</version>
101         </dependency>
102         <dependency>
103             <groupId>org.codehaus.jackson</groupId>
104             <artifactId>jackson-mapper-asl</artifactId>
105             <version>1.9.13</version>
106         </dependency>
107         <dependency>
108             <groupId>org.codehaus.jackson</groupId>
109             <artifactId>jackson-core-asl</artifactId>
110             <version>1.9.13</version>
111         </dependency>
112     </dependencies>
113 
114     <build>
115         <plugins>
116             <plugin>
117                 <groupId>org.springframework.boot</groupId>
118                 <artifactId>spring-boot-maven-plugin</artifactId>
119             </plugin>
120         </plugins>
121     </build>
122 
123 
124 </project>

2.通过MyBatis-generate自动生成实体类和mapper

3.配置XML文件

在resource下面新建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:p="http://www.springframework.org/schema/p"  
    xmlns:aop="http://www.springframework.org/schema/aop"   
    xmlns:context="http://www.springframework.org/schema/context"  
    xmlns:jee="http://www.springframework.org/schema/jee"  
    xmlns:tx="http://www.springframework.org/schema/tx"  
    xsi:schemaLocation="    
        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd  
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd  
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd  
        http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-4.0.xsd  
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd">    
 <bean id="dataSource" class="org.apache.tomcat.jdbc.pool.DataSource" destroy-method="close">
        <!-- Connection Info -->
        <property name="driverClassName" value="${jdbc.driver}" />
        <property name="url" value="${jdbc.url}" />
        <property name="username" value="${jdbc.username}" />
        <property name="password" value="${jdbc.password}" />

        <!-- Connection Pooling Info -->
        <property name="maxActive" value="10" />
        <property name="maxIdle" value="50" />
        <property name="minIdle" value="0" />
        <property name="defaultAutoCommit" value="false" />
    </bean>
     <!-- MyBatis配置 -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <!-- 自动扫描entity目录, 省掉Configuration.xml里的手工配置 -->
        <property name="typeAliasesPackage" value="com.hxyz.media.entity" />
        <!-- 显式指定Mapper文件位置 -->
        <property name="mapperLocations" value="classpath:/mapper/*Mapper.xml" />
    </bean>
    <!-- 扫描basePackage下所有以@MyBatisRepository标识的 接口-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.hxyz.media.mapper" />
    </bean>
</beans>

在resource路径下新建application.properties

1 server.port=8089
2 jdbc.driver=com.mysql.jdbc.Driver
3 jdbc.url=jdbc:mysql://localhost:3306/
4 jdbc.username=jack
5 jdbc.password=123456

至此，我们的xml文件已经配置好了，我们可以写一个简单的控制器来测试下数据库是否已经连通

4.测试是否连通

1 public interface FactoryService {
2     
3     public List<FactoryEntity> findFactory();
4 
5 }

@Service
public class FactoryServiceImpl implements FactoryService{
    @Resource
    private FactoryEntityMapper factoryMaaper;

    @Override
    public List<FactoryEntity> findFactory() {
        FactoryEntityExample example=new FactoryEntityExample();
        Criteria createCriteria = example.createCriteria();
        List<FactoryEntity> selectByExample = factoryMaaper.selectByExample(example);
        return selectByExample;
    }

}

 1 @RestController
 2 @RequestMapping(value="front/factory")
 3 public class FactoryController {
 4     @Resource
 5     private FactoryService factoryService;
 6     
 7     @RequestMapping(value="list")
 8     @ResponseBody
 9     public ResponseVo queryAll(){
10         ResponseVo responseVo=new ResponseVo();
11         List<FactoryEntity> factoryEntityList = factoryService.findFactory();
12         responseVo.setData(factoryEntityList);
13         return responseVo;
14         
15     }
16     
17 
18 }

所以，我们猜一下，现在我请求下，数据会正常的返回么

我们现在请求下

http://localhost:8089/front/factory/list

返回的是

 1 Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.hxyz.media.mapper.FactoryEntityMapper] found for dependency [com.hxyz.media.mapper.FactoryEntityMapper]: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@javax.annotation.Resource(shareable=true, lookup=, name=, description=, authenticationType=CONTAINER, type=class java.lang.Object, mappedName=)}
 2     at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoMatchingBeanFound(DefaultListableBeanFactory.java:1406) ~[spring-beans-4.3.2.RELEASE.jar:4.3.2.RELEASE]
 3     at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1057) ~[spring-beans-4.3.2.RELEASE.jar:4.3.2.RELEASE]
 4     at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1019) ~[spring-beans-4.3.2.RELEASE.jar:4.3.2.RELEASE]
 5     at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.autowireResource(CommonAnnotationBeanPostProcessor.java:518) ~[spring-context-4.3.2.RELEASE.jar:4.3.2.RELEASE]
 6     at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.getResource(CommonAnnotationBeanPostProcessor.java:496) ~[spring-context-4.3.2.RELEASE.jar:4.3.2.RELEASE]
 7     at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor$ResourceElement.getResourceToInject(CommonAnnotationBeanPostProcessor.java:627) ~[spring-context-4.3.2.RELEASE.jar:4.3.2.RELEASE]
 8     at org.springframework.beans.factory.annotation.InjectionMetadata$InjectedElement.inject(InjectionMetadata.java:169) ~[spring-beans-4.3.2.RELEASE.jar:4.3.2.RELEASE]
 9     at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88) ~[spring-beans-4.3.2.RELEASE.jar:4.3.2.RELEASE]
10     at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.postProcessPropertyValues(CommonAnnotationBeanPostProcessor.java:318) ~[spring-context-4.3.2.RELEASE.jar:4.3.2.RELEASE]
11     ... 34 common frames omitted

没有找到FactoryEntityMapper，但是我们明明是在xml中配置了mapperScannerConfigue

这是因为springboot在启动后并不会主动的去读取xml文件，只会根据类文件间的依赖去加载spring的bean类，所以springboot并没有发现xml中的配置

我们可以在启动类中添加

@ImportResource(locations = "classpath*:/applicationContext.xml")

完整的启动类如下

1 @ImportResource(locations = "classpath*:/applicationContext.xml")
2 @SpringBootApplication
3 //@SpringBootApplication(exclude = { DataSourceAutoConfiguration.class})
4 public class MediaApplication {
5 
6     public static void main(String[] args) {
7         SpringApplication.run(MediaApplication.class, args);
8     }
9 }

这时我们再启动就可以返回数据了

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原文地址：https://www.cnblogs.com/xmzJava/p/7076460.html