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