Spring Boot
- 1.什么是Spring Boot
Springboot就是一些写好了maven的模块,我们在使用SPring就不需以传统的方式来用,只需要以maven导入对应的springboot模块,就能完成一大堆操作。简单的说,它使用maven的方式对Spring应用开发进行进一步封装和简化。
Springboot就是为了简化spring应用搭建,开发,部署,监控的开发工具。
- 2.Spring boot入门
开发环境JDK 1.8
项目管理工具( Maven )
开发工具(Eclipse/idea)
2.1导入Spring Boot依赖
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.5.RELEASE</version>
</parent>
<child>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
启动类完成启动 @SpringBootApplication SpringApplication.run
@SpringBootApplication//标识该应用为springboot的应用
public class HelloApplication {
public static void main(String[] args) {
//启动springboot应用
SpringApplication.run(HelloApplication.class);
}
}
controller,启动后完成测试
@Controller
@RequestMapping("/hello")
public class HelloController {
@RequestMapping("/hi1")
@ResponseBody //直接作为字符串返回而不是页面地址
public String sayHello(String name){
return name +" say hello";
}
}
- 3 热部署
添加依赖包:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<optional>true</optional>
<scope>true</scope>
</dependency>
添加spring-boot-maven-plugin:
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<!--fork : 如果没有该项配置,可能devtools不会起作用,即应用不会restart -->
<fork>true</fork>
</configuration>
</plugin>
</plugins>
</build>
注意:在idea中需要手动编译一下,ctrl+F9
- 4.Spring boot web
<!-- web支持: 1、web mvc; 2、restful; 3、jackjson支持; 4、aop ........ -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- servlet 依赖. -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
</dependency>
<!-- tomcat 的支持. -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-jasper</artifactId>
<scope>provided</scope>
</dependency>
4.1 配置application.properties对jsp支持
添加src/main/resources/application.properties:
# 页面默认前缀目录
spring.mvc.view.prefix=/WEB-INF/jsp/
# 响应页面默认后缀
spring.mvc.view.suffix=.jsp
4.1. Freemaker支持
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-freemarker</artifactId>
</dependency>
</dependencies>
4.1.2 配置-application.properties
# 设定ftl文件路径
spring.freemarker.tempalte-loader-path=classpath:/templates
# 关闭缓存,及时刷新,上线生产环境需要修改为true
spring.freemarker.cache=false
spring.freemarker.charset=UTF-8
spring.freemarker.check-template-location=true
spring.freemarker.content-type=text/html
spring.freemarker.expose-request-attributes=true
spring.freemarker.expose-session-attributes=true
spring.freemarker.request-context-attribute=request
spring.freemarker.suffix=.ftl
4.3.3. controller
@Controller
public class IndexController {
@RequestMapping("/index")
public String index(Model model){
model.addAttribute("message", "呵呵!");
return "index";
}
}
4.4. 获取Json数据
@Controller
@RequestMapping("/json1")
public class JsonController {
//字符串
@RequestMapping("/str")
@ResponseBody
public String json1(){
return "yhptest";
}
//对象-日期
@RequestMapping("/obj")
@ResponseBody
public Person json2(){
return new Person(1L,"yhptest",new Date());
}
//数组
@RequestMapping("/array")
@ResponseBody
public List<Person> json3(){
return Arrays.asList(new Person(1L,"yhptest",new Date())
,new Person(2L,"yaohuaipeng",new Date()));
}
}
- 5.springboot配置
YAML是YAML Ain’t Markup Language递归缩写,是YAML不是标记语言的意思,读音“yamel”(或者“雅梅尔”)。YAML是便于人阅读基于unicode编码的各种语言的***标准。它的用途广泛,用于配置文件,日志文件,跨语言数据共享,对象持久化,复杂的数据结构。
打包配置一:
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.8</source>
<target>1.8</target>
<encoding>utf-8</encoding>
</configuration>
</plugin>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<mainClass>cn.itsource.freemark.FreemarkTest</mainClass> <!--主类 包含main-->
<layout>JAR</layout>
</configuration>
</plugin>
</plugins>
</build>
spring:
profiles:
active: test
server:
port: 9001
server:
port: 9002
- 6.SpringBoot测试
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- web支持: 1、web mvc; 2、restful; 3、jackjson支持; 4、aop ........ -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
</dependency>
SpringBoot测试
@RunWith(SpringRunner.class)
@SpringBootTest(classes = App.class) //这事一个Spring测试,要告诉它在哪儿加载Spring配置文件,其实告诉它应用类型就ok
Public class SpringbootTest {
@Test
publicvoid test() throws Exception {
System.out.println(1111);
}
}
- 7.集成三层架构(后面springboot持久化完成)
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
8.2.2. 数据库信息配置
在application.properties文件中配置mysql连接配置文件
########################################################
###datasource
########################################################
spring.datasource.url = jdbc:mysql://localhost:3306/test
spring.datasource.username = root
spring.datasource.password = root
spring.datasource.driverClassName = com.mysql.jdbc.Driver
spring.datasource.max-active=20
spring.datasource.max-idle=8
spring.datasource.min-idle=8
spring.datasource.initial-size=10
1)事务管理器
2)开启注解,就是能够识别@Transactional
3)在要控制事务的Service的或方法上面加上@Transactional
建议:类级别为只读事务,需要写事务的方法上面加写事务
- 8.3. Spring boot-mybtis
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
</dependency>
<!-- mysql 数据库驱动. -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<!--
spring-boot mybatis依赖:
请不要使用1.0.0版本,因为还不支持拦截器插件,
1.1.1 是博主写帖子时候的版本,大家使用最新版本即可
-->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.1.1</version>
</dependency>
<!--
MyBatis提供了拦截器接口,我们可以实现自己的拦截器,
将其作为一个plugin装入到SqlSessionFactory中。
Github上有位开发者写了一个分页插件,我觉得使用起来还可以,挺方便的。
Github项目地址: https://github.com/pagehelper/Mybatis-PageHelper
-->
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper</artifactId>
<version>4.1.0</version>
</dependency>
(4)在application.properties添加配置文件;
########################################################
###datasource
########################################################
spring.datasource.url = jdbc:mysql://localhost:3306/test
spring.datasource.username = root
spring.datasource.password = root
spring.datasource.driverClassName = com.mysql.jdbc.Driver
spring.datasource.max-active=20
spring.datasource.max-idle=8
spring.datasource.min-idle=8
spring.datasource.initial-size=10
一:加上Mapper扫描路径
@MapperScan(“cn.itsource.springboot.mapper”)
1.打注解
@Insert("insert into t_user (name) values(#{name})")
public void save(User user);
2.xml版本
<insert id="savexml" parameterType="User">
insert into t_user(name) values(#{name})
</insert>
配置别名
别名:mybatis.type-aliases-package=
8.3.2. 使用PageHelper分页
@Configuration //相当于我们建了applicationContext-xxx.xml <beans></beans>
public class MyBatisConfiguration {
//相当于配置了一个bean
//<bean class="com.github.pagehelper.PageHelper">
//<property key="offsetAsPageNum" value="true"></property>
//<property key="rowBoundsWithCount" value="true"></property>
//<property key="reasonable" value="true"></property>
// <bean/>
@Bean
public PageHelper pageHelper() {
System.out.println("MyBatisConfiguration.pageHelper()");
PageHelper pageHelper = new PageHelper();
Properties p = new Properties();
p.setProperty("offsetAsPageNum", "true");
p.setProperty("rowBoundsWithCount", "true");
p.setProperty("reasonable", "true");
pageHelper.setProperties(p);
return pageHelper;
}
}
UserServiceImpl
PageHelper.startPage(1, 3);
List<User> users = userMapper.queryPageAll();
System.out.println(users);
System.out.println("assssssssssssss");
for (User user:users){
System.out.println(user);
}
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