1.创建工程
使用idea可以快速创建SpringBoot的工程


这里选择常用的类库,SpringBoot将各种框架类库都进行了封装,可以减少pom文件中的引用配置:

比如Spring和Mybatis整合的时候,传统Spring项目中需要引入:
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<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version> 3.4 . 1 </version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version> 1.3 . 1 </version>
</dependency>
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而在SpringBoot中引入的是:
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<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version> 1.3 . 1 </version>
</dependency>
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可以看到这个类库中除了mybatis和mybatis-spring之外,还有spring-boot的东西

完整的pom.xml如下:
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<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version> 1.5 . 10 .RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF- 8 </project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF- 8 </project.reporting.outputEncoding>
<java.version> 1.8 </java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-aop</artifactId>
</dependency>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version> 1.3 . 1 </version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<!--使用jsp页面-->
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-jasper</artifactId>
</dependency>
<dependency>
<groupId>jstl</groupId>
<artifactId>jstl</artifactId>
<version> 1.2 </version>
</dependency>
</dependencies>
<build>
<finalName>boot</finalName>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
<resources>
<resource>
<directory>src/main/java</directory>
<includes>
<include>** /*.xml</include>
</includes>
</resource>
<resource>
<directory>src/main/resources</directory>
<includes>
<include>**/ *.xml</include>
<include>**/*.properties</include>
</includes>
</resource>
</resources>
</build>
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完整的工程路径如下:

2. 实体类和DAO
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public class Dept {
private Integer id;
private String name;
//getter/setter方法略
}
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public interface DeptDAO {
//查询列表,演示使用传统的mapper映射文件
List<Dept> getDeltList();
//插入,演示使用注解编写sql,省略xml配置
@Insert ( "insert into DEPT(NAME) values(#{name})" )
@Options (useGeneratedKeys = true , keyProperty = "id" , keyColumn = "ID" )
void addDept(String name);
}
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DeptMapper.xml
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<?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.test.springboot.ssm.dao.DeptDAO" >
<resultMap id= "deptMap" type= "Dept" >
<id property= "id" column= "ID" />
<result property= "name" column= "NAME" />
</resultMap>
<select id= "getDeltList" resultMap= "deptMap" >
select ID,NAME from DEPT
</select>
</mapper>
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3.Service
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public interface DeptService {
List<Dept> getDeltList();
void addDept(String name);
}
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@Service
public class DeptServiceImpl implements DeptService {
@Autowired
private DeptDAO deptDAO;
@Override
public List<Dept> getDeltList() {
return deptDAO.getDeltList();
}
@Override
public void addDept(String name) {
deptDAO.addDept(name);
}
}
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4. Controller和页面
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@Controller
public class DeptController {
@Autowired
private DeptService deptService;
@RequestMapping ( "list.html" )
public ModelAndView list() {
List<Dept> deptList = deptService.getDeltList();
return new ModelAndView( "list" , "deptList" , deptList);
}
@RequestMapping ( "add.html" )
public String add(String name) {
deptService.addDept(name);
//添加成功后重定向到列表页
return "redirect:list.html" ;
}
}
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add.jsp
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<form action= "/add.html" method= "post" >
部门名:<input type= "text" name= "name" /><br/>
<input type= "submit" value= "add" />
</form>
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list.jsp
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<c:forEach items= "${deptList}" var= "dept" >
${dept.id}-${dept.name}<br/>
</c:forEach>
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5.启动类
到目前为止,项目与传统的spring没有任何区别。
传统spring项目中需要增加下面两个配置文件,而SpringBoot中没有配置文件:
传统Spring项目中有以下文件:
spring-config.xml
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<?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:aop= "http://www.springframework.org/schema/aop"
xmlns:context= "http://www.springframework.org/schema/context"
xmlns:tx= "http://www.springframework.org/schema/tx"
xsi:schemaLocation="http: //www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http: //www.springframework.org/schema/context
http: //www.springframework.org/schema/context/spring-context-4.2.xsd
http: //www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
http: //www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd">
<!--扫描 @Service 注解-->
<context:component-scan base- package = "com.test.springboot.ssm.service" >
<context:include-filter type= "annotation" expression= "org.springframework.stereotype.Service" />
</context:component-scan>
<!--读取配置文件-->
<context:property-placeholder location= "classpath:db.properties" ignore-unresolvable= "true" />
<!--从配置文件中获取数据源-->
<bean id= "dataSource" class = "org.springframework.jdbc.datasource.DriverManagerDataSource" >
<property name= "driverClassName" value= "${jdbc.driver}" />
<property name= "url" value= "${jdbc.url}" />
<property name= "username" value= "${jdbc.username}" />
<property name= "password" value= "${jdbc.password}" />
</bean>
<!--spring管理session工厂-->
<bean id= "sqlSessionFactory" class = "org.mybatis.spring.SqlSessionFactoryBean" >
<property name= "dataSource" ref= "dataSource" />
<property name= "mapperLocations" value= "classpath:com/test/springboot/ssm/dao/mapper/*.xml" />
<!--配置实体类别名别名-->
<property name= "typeAliasesPackage" value= "com.test.springboot.ssm.pojo" />
</bean>
<!--扫描所有mybatis的dao接口,生成代理实现类-->
<bean class = "org.mybatis.spring.mapper.MapperScannerConfigurer" >
<property name= "basePackage" value= "com.test.springboot.ssm.dao" />
</bean>
<!-- 配置事务管理器 -->
<bean id= "transactionManager"
class = "org.springframework.jdbc.datasource.DataSourceTransactionManager" >
<property name= "dataSource" ref= "dataSource" />
</bean>
<!--事务增强-->
<tx:advice id= "txAdvice" transaction-manager= "transactionManager" >
<tx:attributes>
<!-- 传播行为,匹配的是方法名 -->
<tx:method name= "add*" rollback- for = "Exception" />
<tx:method name= "delete*" rollback- for = "Exception" />
<tx:method name= "update*" rollback- for = "Exception" />
<tx:method name= "get*" propagation= "SUPPORTS" read-only= "true" />
<tx:method name= "do*" rollback- for = "Exception" />
</tx:attributes>
</tx:advice>
<!-- 通过AOP配置提供事务增强,让service包下所有Bean的所有方法拥有事务 -->
<aop:config>
<aop:pointcut id= "serviceMethod"
expression= "execution(* com.test.springboot.ssm..*(..))" />
<aop:advisor pointcut-ref= "serviceMethod" advice-ref= "txAdvice" />
</aop:config>
</beans>
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springMVC-servlet.xml
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<?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:context= "http://www.springframework.org/schema/context"
xmlns:mvc= "http://www.springframework.org/schema/mvc"
xsi:schemaLocation="
http: //www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
http: //www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd
http: //www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.2.xsd">
<mvc:annotation-driven/>
<!--扫描Controller所在的包-->
<context:component-scan base- package = "com.ssm.blog.controller" >
<context:include-filter type= "annotation" expression= "org.springframework.stereotype.Controller" />
</context:component-scan>
<!-- 配置视图解析器-->
<bean class = "org.springframework.web.servlet.view.InternalResourceViewResolver" >
<property name= "prefix" value= "/" ></property><!--前缀-->
<property name= "suffix" value= ".jsp" ></property><!--后缀-->
</bean>
</beans>
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web.xml
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<?xml version= "1.0" encoding= "UTF-8" ?>
<web-app xmlns= "http://java.sun.com/xml/ns/javaee"
xmlns:xsi= "http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http: //java.sun.com/xml/ns/javaee
http: //java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
version= "3.0" >
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring-config.xml</param-value>
</context-param>
<!--配置listener,在启动Web容器的时候加载Spring的配置-->
<listener>
<listener- class >org.springframework.web.context.ContextLoaderListener</listener- class >
</listener>
<filter>
<filter-name>CharacterEncodingFilter</filter-name>
<filter- class >org.springframework.web.filter.CharacterEncodingFilter</filter- class >
<init-param>
<param-name>encoding</param-name>
<param-value>UTF- 8 </param-value>
</init-param>
<init-param>
<param-name>forceEncoding</param-name>
<param-value> true </param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>CharacterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!--配置DispatcherServlet -->
<servlet>
<servlet-name>springMVC</servlet-name>
<servlet- class >org.springframework.web.servlet.DispatcherServlet</servlet- class >
</servlet>
<servlet-mapping>
<servlet-name>springMVC</servlet-name>
<url-pattern>*.html</url-pattern>
</servlet-mapping>
</web-app>
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而SpringBoot中不需要这三个配置文件,写一个启动类,运行main方法即可:
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@SpringBootApplication
@EnableTransactionManagement //开启事务管理
@ComponentScan ( "com.test.springboot.ssm" ) //扫描注解元素
@MapperScan ( "com.test.springboot.ssm.dao" ) //Mybatis的DAO所在包
public class SpringbootSsmApplication {
public static void main(String[] args) {
SpringApplication.run(SpringbootSsmApplication. class , args);
}
public static final String transactionExecution = "execution (* com.test.springboot.service..*(..))" ;
@Autowired
private DataSource dataSource;
//声明式事务
@Bean
public DefaultPointcutAdvisor defaultPointcutAdvisor() {
AspectJExpressionPointcut pointcut = new AspectJExpressionPointcut();
pointcut.setExpression(transactionExecution);
DefaultPointcutAdvisor advisor = new DefaultPointcutAdvisor();
advisor.setPointcut(pointcut);
Properties attributes = new Properties();
attributes.setProperty( "get*" , "PROPAGATION_REQUIRED,-Exception" );
attributes.setProperty( "add*" , "PROPAGATION_REQUIRED,-Exception" );
attributes.setProperty( "update*" , "PROPAGATION_REQUIRED,-Exception" );
attributes.setProperty( "delete*" , "PROPAGATION_REQUIRED,-Exception" );
TransactionInterceptor txAdvice = new TransactionInterceptor( new DataSourceTransactionManager(dataSource), attributes);
advisor.setAdvice(txAdvice);
return advisor;
}
}
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数据库等配置信息放到application.properties中
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#数据源的基本信息
spring.datasource.url = jdbc:mysql: //localhost:3306/test?characterEncoding=utf-8
spring.datasource.username = root
spring.datasource.password =
spring.datasource.driverClassName = com.mysql.jdbc.Driver
#mybatis中mapper文件的路径
mybatis.mapper-locations=classpath*:com/test/springboot/ssm/dao/mappers/*.xml
#起别名。可省略写mybatis的xml中的resultType的全路径
mybatis.type-aliases- package =com.test.springboot.ssm.pojo
#springMVC中的视图信息,响应前缀
spring.mvc.view.prefix=/
# 响应页面默认后缀
spring.mvc.view.suffix=.jsp
#DispatcherServlet中响应的url-pattern
server.sevlet-path=*.html
server.context-path=/boot
#logging.level.root=debug
logging.level.com.test.springboot.ssm.dao=trace
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上面的程序只要启动main方法就可以访问了。
另外,如果需要打包发布到tomcat,需要再配置一个ServletInitializer,否则tomcat启动后会出现404。
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public class ServletInitializer extends SpringBootServletInitializer {
@Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
return application.sources(SpringbootSsmApplication. class );
}
}
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5. 启动原理解析
任何一个SpringBoot程序都有一个启动类:
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@SpringBootApplication
public class StartApplication {
public static void main(String[] args) {
SpringApplication.run(StartApplication. class , args);
}
}
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启动类中包含@SpringBootApplication注解和SpringApplication.run()方法
@SpringBootApplication是一个组合注解,除了基本的原信息标注以外,重要的注解有三个:
@Configuration
@EnableAutoConfiguration
@ComponentScan
如下代码等同于使用@SpringBootApplication注解
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@Configuration
@EnableAutoConfiguration
@ComponentScan
public class StartApplication {
public static void main(String[] args) {
SpringApplication.run(StartApplication. class , args);
}
}
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每次写三个注解比较繁琐,所以使用@SpringBootApplication更方便。
5.1.1 @Configuration
简单的说,SpringBoot中使用一个@Configuration注解的类代替xml配置文件。
如spring-config.xml如下:
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<?xml version= "1.0" encoding= "UTF-8" ?>
<beans xmlns= "http://www.springframework.org/schema/beans"
xmlns:xsi= "http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http: //www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
">
<!--定义bean-->
</beans>
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SpringBoot中写成:
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import org.springframework.context.annotation.Configuration;
@Configuration
public class SpringConfig {
}
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如果定义一个bean,xml中写成:
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<bean id= "dept" class = "com.spring.test.springboot.pojo.Dept" >
<property name= "id" value= "1" />
</bean>
<bean id= "employee" class = "com.spring.test.springboot.pojo.Employee" >
<property name= "name" value= "tom" />
<property name= "dept" ref= "dept" />
</bean>
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SpringBoot中写成:
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@Bean
public Dept dept() {
Dept dept = new Dept();
dept.setId( 1 );
return dept;
}
@Bean
public Employee employee() {
Employee employee = new Employee();
employee.setName( "tom" );
employee.setDept(dept()); //注入依赖对象直接调用@Bean注解的方法
return employee;
}
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SpringBoot中使用@Bean标注一个方法,该方法的方法名将默认成bean的id。注意@Configuration的类要被@ComponentScan扫描到。
5.1.2 @ComponentScan
@ComponentScan 自动扫描并加载符合规则的组件。可以通过basePackages指定要扫描的包。如果不指定赛秒范围,SpringBoot默认会从生命@ComponentScan所在类的包进行扫描。
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@ComponentScan (basePackages = "com.spring.test.springboot.controller" ,includeFilters = { @ComponentScan .Filter(type= FilterType.ANNOTATION,value=Controller. class )})
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等同于
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<context:component-scan base- package = "com.spring.test.springboot.controller" >
<context:include-filter type= "annotation" expression= "org.springframework.stereotype.Controller" />
</context:component-scan>
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5.5.3 @EnableAutoConfiguration
这个注解的作用是将所有符合自动配置条件的bean自动加载到IoC容器。比如我们的项目引入了spring-boot-starter-web依赖,springboot 会自动帮我们配置 tomcat 和 springmvc。@EnableAutoConfigutation中@Import了EnableAutoConfigurationImportSelector,EnableAutoConfigurationImportSelector类使用了Spring Core包的SpringFactoriesLoader类的loadFactoryNamesof()方法。 SpringFactoriesLoader会查询META-INF/spring.factories文件中包含的JAR文件。 当找到spring.factories文件后,SpringFactoriesLoader将查询配置文件命名的属性。spring.factories文件,内容如下:

5.2 SpringApplication
SpringApplication的run方法的实现是我们本次旅程的主要线路,该方法的主要流程大体可以归纳如下:
1) 如果我们使用的是SpringApplication的静态run方法,那么,这个方法里面首先要创建一个SpringApplication对象实例,然后调用这个创建好的SpringApplication的实例方法。在SpringApplication实例初始化的时候,它会提前做几件事情:
a) 根据classpath里面是否存在某个特征类(org.springframework.web.context.ConfigurableWebApplicationContext)来决定是否应该创建一个为Web应用使用的ApplicationContext类型。
b) 使用SpringFactoriesLoader在应用的classpath中查找并加载所有可用的ApplicationContextInitializer。
c) 使用SpringFactoriesLoader在应用的classpath中查找并加载所有可用的ApplicationListener。
d) 推断并设置main方法的定义类。
2) SpringApplication实例初始化完成并且完成设置后,就开始执行run方法的逻辑了,方法执行伊始,首先遍历执行所有通过SpringFactoriesLoader可以查找到并加载的SpringApplicationRunListener。调用它们的started()方法,告诉这些SpringApplicationRunListener,“嘿,SpringBoot应用要开始执行咯!”。
3) 创建并配置当前Spring Boot应用将要使用的Environment(包括配置要使用的PropertySource以及Profile)。
4) 遍历调用所有SpringApplicationRunListener的environmentPrepared()的方法,告诉他们:“当前SpringBoot应用使用的Environment准备好了咯!”。
5) 如果SpringApplication的showBanner属性被设置为true,则打印banner。
6) 根据用户是否明确设置了applicationContextClass类型以及初始化阶段的推断结果,决定该为当前SpringBoot应用创建什么类型的ApplicationContext并创建完成,然后根据条件决定是否添加ShutdownHook,决定是否使用自定义的BeanNameGenerator,决定是否使用自定义的ResourceLoader,当然,最重要的,将之前准备好的Environment设置给创建好的ApplicationContext使用。
7) ApplicationContext创建好之后,SpringApplication会再次借助Spring-FactoriesLoader,查找并加载classpath中所有可用的ApplicationContext-Initializer,然后遍历调用这些ApplicationContextInitializer的initialize(applicationContext)方法来对已经创建好的ApplicationContext进行进一步的处理。
8) 遍历调用所有SpringApplicationRunListener的contextPrepared()方法。
9) 最核心的一步,将之前通过@EnableAutoConfiguration获取的所有配置以及其他形式的IoC容器配置加载到已经准备完毕的ApplicationContext。
10) 遍历调用所有SpringApplicationRunListener的contextLoaded()方法。
11) 调用ApplicationContext的refresh()方法,完成IoC容器可用的最后一道工序。
12) 查找当前ApplicationContext中是否注册有CommandLineRunner,如果有,则遍历执行它们。
13) 正常情况下,遍历执行SpringApplicationRunListener的finished()方法、(如果整个过程出现异常,则依然调用所有SpringApplicationRunListener的finished()方法,只不过这种情况下会将异常信息一并传入处理)
去除事件通知点后,整个流程如下:

6. Thymeleaf
SpringBoot官方不推荐使用JSP,官方推荐使用Thymeleaf。
Thymeleaf是一款用于渲染XML/XHTML/HTML5内容的模板引擎。类似JSP,Velocity,FreeMaker等,它也可以轻易的与Spring MVC等Web框架进行集成作为Web应用的模板引擎。与其它模板引擎相比,Thymeleaf最大的特点是能够直接在浏览器中打开并正确显示模板页面,而不需要启动整个Web应用。
6.1 搭建示例工程
引入thymeleaf的包:
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<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
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在application.properties文件中配置thymeleaf的视图解析:
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spring.thymeleaf.content-type=text/html
spring.thymeleaf.mode =LEGACYHTML5
#开发时关闭缓存,不然没法看到实时页面
spring.thymeleaf.cache= false
#配置静态资源路径
spring.mvc. static -path-pattern=/ static /**
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controller中的代码和以前的项目一样:
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@RequestMapping ( "hello" )
public String helloWorld(Model model) {
//向页面传值
model.addAttribute( "welcome" , "hello thymeleaf" );
return "hello" ;
}
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页面写在/resources/templates下

页面hello.html,页面的文件名与controller中方法的返回值一致。注意页面的<html>标签中有一个<html xmlns:th="http://www.thymeleaf.org">
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<!DOCTYPE html>
<html xmlns:th= "http://www.thymeleaf.org" >
<head>
<meta http-equiv= "Content-Type" content= "text/html; charset=UTF-8" />
<title>Title</title>
</head>
<body>
<p th:text= "${welcome}" ></p>
</body>
</html>
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页面中所有动态的内容都使用“th:”前缀。
并且在thymeleaf的页面中,html语法要求很严格,比如标签必须闭合。如果要在解析时自动进行标签补全,需要引入jar包:
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<dependency>
<groupId>net.sourceforge.nekohtml</groupId>
<artifactId>nekohtml</artifactId>
<version> 1.9 . 22 </version>
</dependency>
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6.2 基础语法
spring-boot很多配置都有默认配置,比如默认页面映射路径为
classpath:/templates/*.html
同样静态文件路径为
classpath:/static/

首先页面的<html>标签要改写:
<html xmlns:th="http://www.thymeleaf.org">
6.2.1 获取变量值
thymeleaf通过${变量名.属性名}来获取属性值,这个语法和EL表达式一样。
页面中所有动态的内容都使用“th:”前缀,并且要写在标签中。
<p th:text=${message}>this is tag p</p>
如果直接访问静态页面,会显示“this is tag p”
如果访问动态内容,那么${message}的值会替换掉原来<p>标签中的静态内容。
常见页面操作如下:
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@RequestMapping ( "hello" )
public String helloWorld(Model model) {
//向页面传值,普通文本
model.addAttribute( "text" , "hello thymeleaf" );
//html转义文本
model.addAttribute( "htmlText" , "<h1>html</h1>" );
model.addAttribute( "ahref" , "test" );
List<String> list = new ArrayList<>();
list.add( "a" );
list.add( "b" );
model.addAttribute( "list" , list);
List<Dept> deptList = new ArrayList<>();
deptList.add( new Dept( 1 , "技术部" ));
deptList.add( new Dept( 2 , "测试部" ));
deptList.add( new Dept( 3 , "行政部" ));
model.addAttribute( "deptList" , deptList);
return "hello" ;
}
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<p th:text= "${text}" >我是文本</p>
<p th:utext= "${htmlText}" >我是转义文本</p>
<p><a th:href= "@{{ahref}?pa={text}(ahref=${ahref},text=${text})}" >我是a标签</a></p>
我是表格<br/>
<table border= "1" >
<tr th:each= "dept:${deptList}" >
<td th:text= "${dept.id}" >id</td>
<td th:text= "${dept.name}" >name</td>
</tr>
</table>
我是下拉框
<select >
<option th:each= "dept:${deptList}" th:value= "${dept.id}" th:text= "${dept.name}" th:selected= "${dept.id}==${param.id[0]}" ></option>
</select><br/>
<input th:value= "${text}" >
<script th:src= "@{static/test.js}" type= "text/javascript" ></script>
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6.2.2 条件判断
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<div th: if = "${ahref == 'test'}" >xxxxxxx</div>
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https://www.cnblogs.com/yanfei1819/p/7798499.html
https://www.cnblogs.com/qlqwjy/p/8463822.html
https://blog.****.net/qq_34491508/article/details/83819005
https://download.****.net/download/qq_31451081/10255701
https://www.jianshu.com/p/e2050a8858f5