一、SpringBoot簡介
傳統Spring開發缺點：
1、導入依賴繁瑣
2、項目配置繁瑣
Spring Boot是全新框架(更像是一個工具， 腳手架)，是Spring提供的一個子項目， 用于快速構建Spring應用程序。
隨著Spring 3.0的發布，Spring 團隊逐漸開始擺脫XML配置文件，并且在開發過程中大量使用“約定優先配置”（convention over configuration）的思想來擺脫Spring框架中各類繁復紛雜的配置。
SpringBoot的特性：
- 起步依賴 jar包的管理 starter
- 自動配置 SpringBoot做了很多默認的配置
- 內置tomcat
二、創建SpringBoot項目
1、pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>3.2.5</version><relativePath/> <!-- lookup parent from repository --></parent><groupId>com.situ</groupId><artifactId>springboot</artifactId><version>0.0.1-SNAPSHOT</version><name>springboot</name><description>springboot</description><properties><java.version>17</java.version></properties><dependencies><!--Spring相關依賴--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter</artifactId></dependency><!--SpringMVC相關依賴--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><!-- mysql驅動 --><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>8.0.31</version></dependency><!-- mybatis --><dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId>f<version>3.0.3</version></dependency><!--thymeleaf相關依賴--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-thymeleaf</artifactId></dependency><!--lombok幫助我們生成實體類的構造方法、get、set、toString--><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><version>1.18.14</version><scope>provided</scope></dependency><!-- 分頁插件 --><dependency><groupId>com.github.pagehelper</groupId><artifactId>pagehelper-spring-boot-starter</artifactId><version>1.4.1</version></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build></project>
2、SpringbootApplication啟動類
//SpringBoot項目啟動類
@SpringBootApplication
@MapperScan("com.situ.springboot.mapper")
public class SpringbootApplication {public static void main(String[] args) {SpringApplication.run(SpringbootApplication.class, args);}
}@Controller
@RequestMapping("/admin")
public class AdminController {@RequestMapping("/selectAll")@ResponseBodypublic List<Admin> selectAll() {System.out.println("AdminController.selectAll");List<Admin> list = new ArrayList<>();Admin admin1 = new Admin();admin1.setId(1);admin1.setName("zhangsan");Admin admin2 = new Admin();admin2.setId(2);admin2.setName("list");Admin admin3 = new Admin();admin3.setId(3);admin3.setName("wangwu");list.add(admin1);list.add(admin2);list.add(admin3);return list;}
}3、application.properties
server.port=8080#DB Configuration
spring.datasource.driverClassName=com.mysql.cj.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/blog?useSSL=false&useUnicode=true&characterEncoding=utf8&serverTimezone=GMT%2b8&zeroDateTimeBehavior=CONVERT_TO_NULL
spring.datasource.username=root
spring.datasource.password=1234spring.mvc.static-path-pattern=/static/**#Spring MyBatis
mybatis.type-aliases-package=com.situ.springboot.pojo
mybatis.mapper-locations=classpath:mapper/*Mapper.xml
mybatis.configuration.map-underscore-to-camel-case=true
#log
mybatis.configuration.log-impl=org.apache.ibatis.logging.stdout.StdOutImpl4、AdminMapper.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapperPUBLIC "-//mybatis.org//DTD Mapper 3.0//EN""http://mybatis.org/dtd/mybatis-3-mapper.dtd"><mapper namespace="com.situ.springboot.mapper.AdminMapper"><select id="selectAll" resultType="Admin">SELECT id,name,password,nick_name,role,image FROM admin</select>
</mapper>三、Thymeleaf
<!--thymeleaf相關依賴-->
<dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>application.properties:
spring.mvc.static-path-pattern=/static/**<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org/">
<head><title>主頁 </title><link rel="stylesheet" type="text/css" th:href="@{/static/layui/css/layui.css}"/><script th:src="@{/static/layui/layui.js}" type="text/javascript" charset="utf-8"></script>
</head>@Controller
@RequestMapping("/page")
public class PageController {/*** /page/user/add /page/login** @return*/@RequestMapping("/**")public String path(HttpServletRequest request) {String requestURI = request.getRequestURI();System.out.println("requestURI: " + requestURI);String[] paths = requestURI.split("/");//["","page","user","list"]//["","page","login"]if (paths.length == 4) {return paths[2] + "_" + paths[3];} else if (paths.length == 3) {return paths[2];} else {return "index";}}
}四、登錄攔截器
//攔截器的作用：瀏覽器訪問服務器的請求，都要首先經過攔截器
public class LoginInterceptor implements HandlerInterceptor {@Overridepublic boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {////1.判斷用戶有沒有登錄//2.如果登錄了，就放行，可以訪問后臺的資源//3.如果沒有登錄，跳轉到登錄界面HttpSession session = request.getSession();Admin admin = (Admin) session.getAttribute("admin");if (admin == null) {//沒有登錄，跳轉到登錄界面response.sendRedirect("/page/login");return false;}//已經登錄，放行return true;}
}攔截器配置
WebMvcConfigurer提供了配置SpringMVC底層的所有組件入口
// @Component <bean>
// @Controller @Service @Repository
// 這四個注解的作用是一樣的，下面三個不一樣主要是為了區分不同層// @Configuration用于定義配置類，可以替換xml配置文件，
// 加了這個注解的類的內部包含一個或多個被@Bean注解的方法
@Configuration
public class WebConfig implements WebMvcConfigurer {/* <bean name="admin" class="com.situ.springboot.pojo.Admin"/>*/@Beanpublic Admin createAdmin() {return new Admin();}//配置虛擬路徑@Overridepublic void addResourceHandlers(ResourceHandlerRegistry registry) {registry.addResourceHandler("/pic/**").addResourceLocations("file:/D:/mypic/");WebMvcConfigurer.super.addResourceHandlers(registry);}/*<!-- 配置攔截器 --><mvc:interceptors><mvc:interceptor><mvc:mapping path="/**"/><mvc:exclude-mapping path=""/><bean class="com.situ.mvc.interceptor.MyInterceptor1"></bean></mvc:interceptor></mvc:interceptors>*/// 這個方法用來注冊攔截器，我們寫的攔截器需要在這里配置才能生效@Overridepublic void addInterceptors(InterceptorRegistry registry) {//把登錄的攔截器配置上才能起作用// addPathPatterns("/**") 攔截器攔截所有的請求，靜態資源也攔截了，需要放行// excludePathPatterns 代表哪些請求不需要攔截registry.addInterceptor(new LoginInterceptor()).addPathPatterns("/**").excludePathPatterns("/page/login", "/admin/login", "/admin/logout", "/static/**");}
}
