Spring Boot Notes 3 (Web Development)

One, web development support

Spring-boot-starter-web provides dependencies for embedding tomcat and SpringMVC

Two, Thymeleaf template engine

1), basic knowledge

Thymeleaf is a class library of java, an xml/xhtml/html5 template engine, which can be used as a view layer

Can be used to replace jsp

2), import

</html>

Remarks: 1), introduce namespace

2), Introduce static resources through "@{}", which is very error-prone under jsp

3), access the data in the model

Access properties in web through "${}"

e.g. <span th:text="${person.name}"></span>

4), data iteration in model

e.g. <li th:each="person:${people}">

</li>

5), data judgment

Support <,>==,!=, etc. springEL expressions

e.g. <div th:if="${not #lists.isEmpty(people)}"></div>

6). Access model in javascript

eg,

var single= [[${singlePerson}]];

</script>

Remarks : 1), add it to the script tag through th:inline="javascirpt"

2), use [[${}]] to get the value

3), more: http://www.thymeleaf.org

7), integration with springMVC

thymeleaf defines 2 support classes:

org, thymeleaf.spring4.view.ThymeleafView

org.thymeleaf.spring4.view.ThymeleafViewResolver

SpringTemplateEngine: used to use the Thymeleaf template engine under springMVC

TemplateResolver: used to set the template engine (prefix, suffix)

@Bean

public TemplateResovler templateResolver(){

TemplateResovler templateResolver = new ServletContextTemplateResolver();

templateResolver.setPrefix("/WEB-INF/templates");

templateResolver.setSuffix(".html");

templateResolver.setTemplateMode("HTML5");

return templateResolver;

}

@Bean

public SpringTemplateEngine templateEngine(){

SpringTemplateEngine templateEngine = new templateEngine();

templateEngine.setTemplateResolver(templateResolver());

return templateEngine

}

@Bean

public ThymeleafViewResolver thymeleafViewResolver () {

ThymeleafViewResolver thymeleafViewResolver = new ThymeleafViewResolver ();

ThymeleafViewResolver.setTemplateEngine (templateEngine ());

return thymeleafViewResolver;

}

8). Spring Boot support

Spring Boot autowires Thymeleaf through the org.springframework.boot.autoconfigure.thymeleaf package.

To configure thymeleaf through ThymeleafProperties, just start with spring.thymeleaf in application.properties to configure

ThymeleafProperties source code, post-fill

Example in application:

#thymeleaf start

spring.thymeleaf.mode=HTML5

spring.thymeleaf.encoding=UTF-8

spring.thymeleaf.content-type=text/html

#Close the cache during development, otherwise you won't be able to see the real-time page

spring.thymeleaf.cache=false

#thymeleaf end

Three, Web related configuration

1, Automatic configuration provided by spring boot

1), Automatically configure ViewResolver

ContentNegotiatingViewResolver: A special ViewResolver with the highest priority

Not handle it yourself, but handle it to other viewResolvers

BeanNameViewResolver: to find the view that the bean returns a string to render the view

InternalResourceViewResolver: mainly returns the view name by setting the prefix, suffix, and method in the controller

2), Automatically configure static resources

The automatic configuration of the following static resources is defined in the addResourceHandlers method of the automatic configuration class

Classpath files: Directly map the static files in /static, /public, /resources, /META-INF/resources to /**.

It can be accessed through localhost:8080/**

webjar: Map the static files of /META-INF/resources/webjars/ of webjar to /webjars/**

3), automatically configure Formatter and Converter

4), automatically configure HttpMessageConverters

5), support for static homepage

The static home page index.html is placed in the directory. META-INF/resources/, resources/, public/, statuc/ can be.

6), take over the web configuration of spring boot

If the default configuration does not meet the requirements, you can implement your own configuration through @Configuration, @EnableWebMvc

7), register Servlet, Filter, Listener

Declare it as a spring bean to achieve the effect. That is: @Bean

Four, Tomcat configuration

All properties about Tomcat are defined in org.springframework.boot.autoconfigure.web.ServerProperties.

1, Configure Tomcat

applicaiton.properties add the following configuration

server.port=8080 #The default is 8080

server.session-timeout=600 #Expiration time, in seconds

server.context-path= #Configure the access path, the default is /

server.tomcat.uri-encoding= #Configure the encoding of tomcat, the default is UTF-8

server.tomcat.compression= #Whether tomcat enables compression, the default is off off

.....

2, code configuration tomcat

3, replace tomcat

In pom.xml, change the dependency of spring-boot-starter-web from spring-boot-starter-web to the corresponding

e.g. spring-boot-starter-jetty (undertow)

3, SSL(Secure Sockets Layer) 配置

1), Generate a certificate: It can be generated with the keytool that comes with JDK.

eg keytool -genkey -alias tomcat and follow the prompts

2), spring boot configure SSL

server.port=8443

server.ssl.key-store=.keystore

server.ssl.key-store-password=123

server.ssl.keyStoreType=JKS

3), http转https

Configure TomcatEmbeddedServletContainerFactory and add Tomcat's connector to implement

Five, Favicon configuration

关闭: spring.mvc.favicon.enabled=false

Set up your own favicon: put your own favicon.ico (the file name cannot be moved) and put it in the root directory of the classpath (/, resources/ public/, static)

You can wait in some directories

Six, WebSocket

1, Preparation: Add websocket dependencies

2, broadcast

//everything

3, point to point

/everything

Seven, applications based on Bootstrap and AngularJs

Bootstrap download address: http://getbootstrap.com/getting-started/

Page component support: http://getbootstrap.com/components

Lots of js plugins: http://getbootstrap.com/javascript/

angularJs: https://angularjs.org/

For an example, see the network disk: projects/springboot

Spring Boot Notes 3 (Web Development)

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