Spring Boot+Thymeleaf

Spring Boot

pom.xml中引入Spring Boot web启动器依赖Spring Boot的启动类整合mybatis创建Spring Boot配置文件实体类使用lombok 编写dao层类业务层Thymeleaf@{}链接表达式${...}获取变量*{...}选择变量表达式文本替换Each循环调用JavaScript函数拼接参数条件判断 控制层数据展示层SpringBoot项目的部署 Spring Boot用于简化Spring框架项目的创建和启动,简化项目配置,内置了Spring,SpringMVC,Tomcat,并提供对其他框架的扩展.

pom.xml中引入Spring Boot web启动器依赖

<parent> <artifactId>spring-boot-starter-parent</artifactId> <groupId>org.springframework.boot</groupId> <version>2.1.5.RELEASE</version> </parent> <dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>3.8.1</version> <scope>test</scope> </dependency> <!-- spring boot web启动器--> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <!-- thymeleaf--> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-thymeleaf</artifactId> <version>2.1.5.RELEASE</version> </dependency> <!--载入mybatis--> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>1.3.2</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>8.0.13</version> </dependency> <!--允许使用jsp--> <dependency> <groupId>org.apache.tomcat.embed</groupId> <artifactId>tomcat-embed-jasper</artifactId> <version>9.0.19</version> <scope>provided</scope> </dependency> <!-- jstl 依赖 --> <dependency> <groupId>javax.servlet</groupId> <artifactId>jstl</artifactId> </dependency> </dependencies>

Spring-boot-starter-web内置了Spring和Spring MVC,Tomcat等: 如果想用Netty可以用Spring-boot-starter-webflux.

Spring Boot的启动类

@SpringBootApplication public class Run { public static void main(String[] args) { SpringApplication application = new SpringApplication(Run.class); application.run(args); } }

或者:

@SpringBootApplication public class Run { public static void main(String[] args) { SpringApplication.run(Run.class,args); } }

直接在main方法中启动,而不需要配置Tomcat来启动 启动成功: 直接用localhost:8080访问

整合mybatis

Spring Boot持久层提供了Spring-jdbc,mybatis,hibernate等的支持,此处使用mybatis.

pom.xml引入mybatis-spring-boot-starter依赖:

<!--载入mybatis--> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>1.3.2</version> </dependency> <!--mysql驱动--> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>8.0.13</version> </dependency> </dependencies>

经过实测1.3.2兼容spring-boot-starter-web的2.1.5.RELEASE版本,其他有些版本不能兼容导致不能启动 mybatis-spring-boot-starter包含了mybatis:

创建Spring Boot配置文件

Spring Boot的配置文件是固定的,为application.properties或application.yml 创建application.properties: 内容: properties:

spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver spring.datasource.url=jdbc:mysql://localhost:3306/travel spring.datasource.username=root spring.datasource.password=188278 mybatis.type-aliases-package=com.test.domain mybatis.mapperLocations=classpath:daoMappers/*.xml

yml: yml要注意缩进和":"后要有空格

spring: datasource: driver-class-name: com.mysql.cj.jdbc.Driver url: jdbc:mysql://localhost:3306/travel username: root password: 1234 mybatis: type-aliases-package: com.test.domain mapperLocations: classpath:daoMappers/*.xml

mybatis.mapperLocations为mybatis映射文件位置

实体类

如果不想写get,set可以用lombok.

package com.test.domain; import java.io.Serializable; /** * 用户实体类 */ public class User implements Serializable { private int uid;//用户id private String username;//用户名，账号 private String password;//密码 private String name;//真实姓名 private String birthday;//出生日期 private String sex;//男或女 private String telephone;//手机号 private String email;//邮箱 private String status;//激活状态，Y代表激活，N代表未激活 private String code;//激活码（要求唯一） /** * 无参构造方法 */ public User() { } /** * 有参构方法 * @param uid * @param username * @param password * @param name * @param birthday * @param sex * @param telephone * @param email * @param status * @param code */ public User(int uid, String username, String password, String name, String birthday, String sex, String telephone, String email, String status, String code) { this.uid = uid; this.username = username; this.password = password; this.name = name; this.birthday = birthday; this.sex = sex; this.telephone = telephone; this.email = email; this.status = status; this.code = code; } public int getUid() { return uid; } public void setUid(int uid) { this.uid = uid; } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getBirthday() { return birthday; } public void setBirthday(String birthday) { this.birthday = birthday; } public String getSex() { return sex; } public void setSex(String sex) { this.sex = sex; } public String getTelephone() { return telephone; } public void setTelephone(String telephone) { this.telephone = telephone; } public String getEmail() { return email; } public void setEmail(String email) { this.email = email; } public String getStatus() { return status; } public void setStatus(String status) { this.status = status; } public String getCode() { return code; } public void setCode(String code) { this.code = code; } }

使用lombok

pom.xml引入依赖:

<!--lombok--> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <optional>true</optional> <version>1.16.18</version> </dependency>

@Data 自动生成所有属性的get,set方法 @AllArgsConstructor 自动生成所有参数的构造方法 @NoArgsConstructor 自动生成无参构造方法.

/** * 用户实体类 */ @Data //自动生成所有属性的get,set方法 @AllArgsConstructor @NoArgsConstructor public class User implements Serializable { private int uid;//用户id private String username;//用户名，账号 private String password;//密码 private String name;//真实姓名 private String birthday;//出生日期 private String sex;//男或女 private String telephone;//手机号 private String email;//邮箱 private String status;//激活状态，Y代表激活，N代表未激活 private String code;//激活码（要求唯一） }

@Sl4j还可以打印日志.用log.info()方法. 如:

@RestController @Slf4j public class TestController { @Autowired private UserService userService; @RequestMapping("/test") public String test(){ userService.checkPwd("aa","111111"); log.info("****this is test"); return "test"; } }

编写dao层类

@Mapper public interface UserDao { public User findById(int id); @Select("select * from tab_user where name=#{name}") public List<User> findByName(String name); }

创建映射文件: 编写映射文件:

<?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.dao.UserDao"> <select id="findById" resultType="com.test.domain.User" parameterType="int"> select * from tab_user where uid = #{id} </select> </mapper>

业务层

@Service public class UserService { @Autowired private UserDao userDao; public boolean checkPwd(String uname,String upwd){ System.out.println(userDao.findById(1).getName()); System.out.println(userDao.findByName("aa")); User user=userDao.findById(1); if (uname.equals(user.getName())&&upwd.equals(user.getPassword())){ return true; } else { return false; } } }

Thymeleaf

pom引入依赖:

<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-thymeleaf</artifactId> </dependency>

application.properties配置文件中配置thymaleaf配置:

spring.thymeleaf.cache = false spring.thymeleaf.encoding = UTF-8

开发时关闭缓存

Thymeleaf默认静态文件位置是resources/static,默认模板文件位置是resources/templates,默认后缀是.html，也可以自己配置：

#spring.thymeleaf.mode = HTML5 spring.thymeleaf.prefix = classpath:/mytemplates/ spring.thymeleaf.suffix = .html

spring.thymeleaf.prefix = classpath:/mytemplates/指定了模板页面位置.

模板页面不能直接访问，需要通过控制类跳转。

页面引入thymeleaf：

<html xmlns:th="http://www.thymeleaf.org">

@{}链接表达式

<link th:href="@{login/css/signin.css}" rel="stylesheet">

将默认从resources/static/login/css/signin.css中寻找该文件.

<form class="form-signin" th:action="@{/Login}">

将请求Login

${…}获取变量

和EL表达式类似

至于h1里面的原有的值只是为了给前端开发时做展示用的.这样的话很好的做到了前后端分离。

*{…}选择变量表达式

th:text="*{firstName}等价于th:text="${session.user.firstName}

文本替换

th:text="|Welcome to our application, ${user.name}!|“相当于th:text=”'Welcome to our application, ’ + ${user.name} + ‘!’" 但只能包含表达式变量，而不能有条件判断等

Each循环

<tr th:each="emp : ${empList}"> <td th:text="${emp.id}">1</td> <td th:text="${emp.name}">海</td> <td th:text="${emp.age}">18</td> </tr>

调用JavaScript函数拼接参数

th:οnclick="‘delUser(’+${user.id}+’);’"

条件判断

If,如果成立则显示,否则不显示标签. th:if="${hello==‘Hell’}"

?:，相当于if-else。 th:text="${hello==‘Hello’?‘Hello’:‘Hi’}+’!请登录’"

控制层

@Controller public class UserController { // 向用户登录页面跳转 @GetMapping("/userLogin") public String toLoginPage(Model model) { model.addAttribute("hello","Hello"); return "login"; } @PostMapping("/Login") public String login(String name, String pwd,Model model) throws IOException { if(!userService.checkPwd(name,pwd)){ model.addAttribute("error","t"); } return "login"; } }

数据展示层

<!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>用户登录界面</title> <link th:href="@{login/css/bootstrap.min.css}" rel="stylesheet"> <link th:href="@{login/css/signin.css}" rel="stylesheet"> </head> <body class="text-center"> <form class="form-signin" th:action="@{/Login}" th:method="post"> <img class="mb-4" th:src="@{/login/img/login.jpg}" width="72px" height="72px"> <h1 class="h3 mb-3 font-weight-normal" th:text="${hello=='Hello'?'Hello':'Hi'}+'!请登录'">请登录</h1> <!-- 用户登录错误信息提示框 --> <div th:if="${param.error}" style="color: red;height: 40px;text-align: left;font-size: 1.1em"> <img th:src="@{/login/img/loginError.jpg}" width="20px">用户名或密码错误，请重新登录！ </div> <input type="text" name="name" class="form-control" placeholder="用户名" required="" autofocus=""> <input type="password" name="pwd" class="form-control" placeholder="密码" required=""> <div class="checkbox mb-3"> <label> <input type="checkbox" name="rememberme"> 记住我 </label> </div> <button class="btn btn-lg btn-primary btn-block" type="submit">登录</button> <p class="mt-5 mb-3 text-muted">Copyright© 2019-2020</p> </form> </body> </html>

SpringBoot项目的部署

打包成jar包 Pom.xml中配置:

<packaging>jar</packaging>

还要指定main方法所在的类:

<plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> <configuration> <mainClass>com.itheima.BlogSystemApplication</mainClass> </configuration> </plugin> </plugins> </build>