Spring Boot Thymeleaf示例
Thymeleaf是一个基于Java的库，用于创建Web应用程序。 它为在Web应用程序中提供XHTML/HTML5提供了很好的支持。 在本章中将详细了解和学习Thymeleaf。
Thymeleaf模板
Thymeleaf将文件转换为格式良好的XML文件。它包含6种类型的模板，如下所示 -
- XML
- 有效的XML
- XHTML
- 有效的XHTML
- HTML5
- 旧版HTML5
除旧版HTML5之外的所有模板都指的是格式正确的有效XML文件。 旧版HTML5允许我们在网页中呈现HTML5标记，包括非封闭标记。
Web应用程序
使用Thymeleaf模板在Spring Boot中创建Web应用程序。必须按照以下步骤使用Thymeleaf在Spring Boot中创建Web应用程序。
使用以下代码创建@Controller类文件以将Request URI重定向到HTML文件 -
package com.yiibai.demo.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
public class WebController {
@RequestMapping(value = "/index")
public String index() {
return "index";
}
}
在上面的示例中，请求URI是/index，被重定向到index.html文件。 请注意，index.html 文件应放在templates目录下，所有JS和CSS文件应放在static目录下。 在所示的示例中，使用CSS文件来更改文本的颜色。
使用以下代码并在单独的文件夹css 中创建一个CSS文件，并将该文件命名为styles.css -
h4 {
color: red;
}
index.html 文件的代码如下 -
<!DOCTYPE html>
<html>
<head>
<meta charset = "UTF-8" />
<link href = "css/styles.css" rel = "stylesheet"/>
<title>Spring Boot应用程序(Yiibai.com)</title>
</head>
<body>
<h4>Thymeleaf Spring Boot web应用程序示例</h4>
<p>
Power by Yiibai.com
</p>
</body>
</html>
在Eclipse项目浏览器显示，如下面给出的截图 -
现在，需要在构建配置文件中添加Spring Boot Starter Thymeleaf依赖项。
Maven用户可以将以下依赖项添加到pom.xml 文件中 -
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
Gradle用户可以在build.gradle 文件中添加以下依赖项 -
compile group: 'org.springframework.boot', name: 'spring-boot-starter-thymeleaf'
主Spring Boot应用程序类文件的代码如下 -
package com.yiibai.demo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class DemoApplication {
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
}
Maven构建文件 - pom.xml 的代码如下 -
<?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
http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.yiibai</groupId>
<artifactId>demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>demo</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.8.RELEASE</version>
<relativePath />
</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-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
Gradle构建文件 - build.gradle 的代码如下 -
buildscript {
ext {
springBootVersion = '1.5.8.RELEASE'
}
repositories {
mavenCentral()
}
dependencies {
classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
}
}
apply plugin: 'java'
apply plugin: 'eclipse'
apply plugin: 'org.springframework.boot'
group = 'com.yiibai'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = 1.8
repositories {
mavenCentral()
}
dependencies {
compile('org.springframework.boot:spring-boot-starter-web')
compile group: 'org.springframework.boot', name: 'spring-boot-starter-thymeleaf'
testCompile('org.springframework.boot:spring-boot-starter-test')
}
创建可执行的JAR文件，并使用以下Maven或Gradle命令运行spring boot应用程序。
对于Maven，使用如下所示的命令 -
mvn clean install
在“BUILD SUCCESS”之后，在目标目录下找到JAR文件。
对于Gradle，使用如下所示的命令 -
gradle clean build
在“BUILD SUCCESSFUL”之后，在build/libs 目录下找到JAR文件。
使用此处给出的命令运行JAR文件 -
D:workspspringbootthymeleaftarget>java -jar demo-0.0.1-SNAPSHOT.jar
. ____ _ __ _ _
/\ / ___'_ __ _ _(_)_ __ __ _
( ( )___ | '_ | '_| | '_ / _` |
\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |___, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v1.5.8.RELEASE)
2018-10-04 10:37:55.985 INFO 14820 --- [ main] com.yiibai.demo.DemoApplication : Starting DemoApplication v0.0.1-SNAPSHOT on DESKTOP-CAN8JLM with PID 14820 (D:workspspringbootthymeleaftargetdemo-0.0.1-SNAPSHOT.jar started by hema in D:workspspringbootthymeleaftarget)
2018-10-04 10:37:55.989 INFO 14820 --- [ main] com.yiibai.demo.DemoApplication : No active profile set, falling back to default profiles: default
2018-10-04 10:37:56.498 INFO 14820 --- [ main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@443b7951: startup date [Thu Oct 04 10:37:56 CST 2018]; root of context hierarchy
2018-10-04 10:37:58.322 INFO 14820 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080 (http)
2018-10-04 10:37:58.342 INFO 14820 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2018-10-04 10:37:58.347 INFO 14820 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.5.23
2018-10-04 10:37:58.478 INFO 14820 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2018-10-04 10:37:58.480 INFO 14820 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 1985 ms
2018-10-04 10:37:58.653 INFO 14820 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Mapping servlet: 'dispatcherServlet' to [/]
2018-10-04 10:37:58.665 INFO 14820 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*]
2018-10-04 10:37:58.666 INFO 14820 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2018-10-04 10:37:58.667 INFO 14820 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2018-10-04 10:37:58.667 INFO 14820 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*]
2018-10-04 10:37:59.106 INFO 14820 --- [ main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@443b7951: startup date [Thu Oct 04 10:37:56 CST 2018]; root of context hierarchy
2018-10-04 10:37:59.201 INFO 14820 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/index]}" onto public java.lang.String com.yiibai.demo.controller.WebController.index()
2018-10-04 10:37:59.205 INFO 14820 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error]}" onto public org.springframework.http.ResponseEntity<java.util.Map<java.lang.String, java.lang.Object>> org.springframework.boot.autoconfigure.web.BasicErrorController.error(javax.servlet.http.HttpServletRequest)
2018-10-04 10:37:59.206 INFO 14820 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error],produces=[text/html]}" onto public org.springframework.web.servlet.ModelAndView org.springframework.boot.autoconfigure.web.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)
2018-10-04 10:37:59.245 INFO 14820 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-10-04 10:37:59.246 INFO 14820 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-10-04 10:37:59.296 INFO 14820 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-10-04 10:37:59.782 INFO 14820 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Registering beans for JMX exposure on startup
2018-10-04 10:37:59.992 INFO 14820 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080 (http)
2018-10-04 10:37:59.998 INFO 14820 --- [ main] com.yiibai.demo.DemoApplication : Started DemoApplication in 4.51 seconds (JVM running for 5.12)
现在，应用程序已在Tomcat端口8080上启动。
现在打开浏览器访问URL => http://localhost:8080/index， 看到如下所示的输出 -
