尚硅谷【SpringBoot】web(源码讲解太多不建议阅读)
四、Web开发
1、简介
使用SpringBoot;
1)、创建SpringBoot应用,选中我们需要的模块;
2)、SpringBoot已经默认将这些场景配置好了,只需要在配置文件中指定少量配置就可以运行起来
3)、自己编写业务代码;
自动配置原理?
这个场景SpringBoot帮我们配置了什么?能不能修改?能修改哪些配置?能不能扩展?xxx
xxxxAutoConfiguration:帮我们给容器中自动配置组件;
xxxxProperties:配置类来封装配置文件的内容;
2、SpringBoot对静态资源的映射规则;
@ConfigurationProperties(prefix = "spring.resources", ignoreUnknownFields = false)
public class ResourceProperties implements ResourceLoaderAware {
//可以设置和静态资源有关的参数,缓存时间等
WebMvcAuotConfiguration:
@Override
public void addResourceHandlers(ResourceHandlerRegistry registry) {
if (!this.resourceProperties.isAddMappings()) {
logger.debug("Default resource handling disabled");
return;
}
Integer cachePeriod = this.resourceProperties.getCachePeriod();
if (!registry.hasMappingForPattern("/webjars/**")) {
customizeResourceHandlerRegistration(
registry.addResourceHandler("/webjars/**")
.addResourceLocations(
"classpath:/META-INF/resources/webjars/")
.setCachePeriod(cachePeriod));
}
String staticPathPattern = this.mvcProperties.getStaticPathPattern();
//静态资源文件夹映射
if (!registry.hasMappingForPattern(staticPathPattern)) {
customizeResourceHandlerRegistration(
registry.addResourceHandler(staticPathPattern)
.addResourceLocations(
this.resourceProperties.getStaticLocations())
.setCachePeriod(cachePeriod));
}
}
//配置欢迎页映射
@Bean
public WelcomePageHandlerMapping welcomePageHandlerMapping(
ResourceProperties resourceProperties) {
return new WelcomePageHandlerMapping(resourceProperties.getWelcomePage(),
this.mvcProperties.getStaticPathPattern());
}
//配置喜欢的图标
@Configuration
@ConditionalOnProperty(value = "spring.mvc.favicon.enabled", matchIfMissing = true)
public static class FaviconConfiguration {
private final ResourceProperties resourceProperties;
public FaviconConfiguration(ResourceProperties resourceProperties) {
this.resourceProperties = resourceProperties;
}
@Bean
public SimpleUrlHandlerMapping faviconHandlerMapping() {
SimpleUrlHandlerMapping mapping = new SimpleUrlHandlerMapping();
mapping.setOrder(Ordered.HIGHEST_PRECEDENCE + 1);
//所有 **/favicon.ico
mapping.setUrlMap(Collections.singletonMap("**/favicon.ico",
faviconRequestHandler()));
return mapping;
}
@Bean
public ResourceHttpRequestHandler faviconRequestHandler() {
ResourceHttpRequestHandler requestHandler = new ResourceHttpRequestHandler();
requestHandler
.setLocations(this.resourceProperties.getFaviconLocations());
return requestHandler;
}
}
==1)、所有 /webjars/** ,都去 classpath:/META-INF/resources/webjars/ 找资源;==
webjars:以jar包的方式引入静态资源;
==2)、"/**" 访问当前项目的任何资源,都去(静态资源的文件夹)找映射==
"classpath:/META-INF/resources/",
"classpath:/resources/",
"classpath:/static/",
"classpath:/public/"
"/":当前项目的根路径
localhost:8080/abc === 去静态资源文件夹里面找abc
==3)、欢迎页; 静态资源文件夹下的所有index.html页面;被"/**"映射;==
localhost:8080/ 找index页面
==4)、所有的 **/favicon.ico 都是在静态资源文件下找;==
3、模板引擎
SpringBoot推荐的Thymeleaf;
语法更简单,功能更强大;
1、引入thymeleaf;个人使用
xml
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
切换thymeleaf版本
全部引入最新版本,git.com查看最新版本
<thymeleaf.version>3.0.11.RELEASE</thymeleaf.version>
<!-- 布局功能的支持程序 thymeleaf3主程序 layout2以上版本 -->
<!-- thymeleaf2 layout1-->
<thymeleaf-layout-dialect.version>2.3.0</thymeleaf-layout-dialect.version>
</properties>
2、Thymeleaf使用
```java
@ConfigurationProperties(prefix = "spring.thymeleaf")
public class ThymeleafProperties {
private static final Charset DEFAULT_ENCODING = Charset.forName("UTF-8");
private static final MimeType DEFAULT_CONTENT_TYPE = MimeType.valueOf("text/html");
public static final String DEFAULT_PREFIX = "classpath:/templates/";
public static final String DEFAULT_SUFFIX = ".html";
//
```
只要我们把HTML页面放在classpath:/templates/,thymeleaf就能自动渲染;
使用:
1、导入thymeleaf的名称空间
```xml
<html lang="en" xmlns:th="http://www.thymeleaf.org">
```
2、使用thymeleaf语法;
```html
<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<h1>成功!</h1>
<!--th:text 将div里面的文本内容设置为 -->
<div th:text="${hello}">这是显示欢迎信息</div>
</body>
</html>
```
### 3、语法规则
1)、th:text;改变当前元素里面的文本内容;
th:任意html属性;来替换原生属性的值
2)、表达式?
```properties
Simple expressions:(表达式语法)
Variable Expressions: ${...}:获取变量值;OGNL;
1)、获取对象的属性、调用方法
2)、使用内置的基本对象:
#ctx : the context object.
#vars: the context variables.
#locale : the context locale.
#request : (only in Web Contexts) the HttpServletRequest object.
#response : (only in Web Contexts) the HttpServletResponse object.
#session : (only in Web Contexts) the HttpSession object.
#servletContext : (only in Web Contexts) the ServletContext object.
${session.foo}
3)、内置的一些工具对象:
#execInfo : information about the template being processed.
#messages : methods for obtaining externalized messages inside variables expressions, in the same way as they would be obtained using #{…} syntax.
#uris : methods for escaping parts of URLs/URIs
#conversions : methods for executing the configured conversion service (if any).
#dates : methods for java.util.Date objects: formatting, component extraction, etc.
#calendars : analogous to #dates , but for java.util.Calendar objects.
#numbers : methods for formatting numeric objects.
#strings : methods for String objects: contains, startsWith, prepending/appending, etc.
#objects : methods for objects in general.
#bools : methods for boolean evaluation.
#arrays : methods for arrays.
#lists : methods for lists.
#sets : methods for sets.
#maps : methods for maps.
#aggregates : methods for creating aggregates on arrays or collections.
#ids : methods for dealing with id attributes that might be repeated (for example, as a result of an iteration).
Selection Variable Expressions: *{...}:选择表达式:和${}在功能上是一样;
补充:配合 th:object="${session.user}:
<div th:object="${session.user}">
<p>Name: <span th:text="*{firstName}">Sebastian</span>.</p>
<p>Surname: <span th:text="*{lastName}">Pepper</span>.</p>
<p>Nationality: <span th:text="*{nationality}">Saturn</span>.</p>
</div>
Message Expressions: #{...}:获取国际化内容
Link URL Expressions: @{...}:定义URL;
@{/order/process(execId=${execId},execType='FAST')}
Fragment Expressions: ~{...}:片段引用表达式
<div th:insert="~{commons :: main}">...</div>
Literals(字面量)
Text literals: 'one text' , 'Another one!' ,…
Number literals: 0 , 34 , 3.0 , 12.3 ,…
Boolean literals: true , false
Null literal: null
Literal tokens: one , sometext , main ,…
Text operations:(文本操作)
String concatenation: +
Literal substitutions: |The name is ${name}|
Arithmetic operations:(数学运算)
Binary operators: + , - , * , / , %
Minus sign (unary operator): -
Boolean operations:(布尔运算)
Binary operators: and , or
Boolean negation (unary operator): ! , not
Comparisons and equality:(比较运算)
Comparators: > , < , >= , <= ( gt , lt , ge , le )
Equality operators: == , != ( eq , ne )
Conditional operators:条件运算(三元运算符)
If-then: (if) ? (then)
If-then-else: (if) ? (then) : (else)
Default: (value) ?: (defaultvalue)
Special tokens:
No-Operation: _
```
```java
@ConfigurationProperties(prefix = "spring.thymeleaf")
public class ThymeleafProperties {
private static final Charset DEFAULT_ENCODING = Charset.forName("UTF-8");
private static final MimeType DEFAULT_CONTENT_TYPE = MimeType.valueOf("text/html");
public static final String DEFAULT_PREFIX = "classpath:/templates/";
public static final String DEFAULT_SUFFIX = ".html";
//
```
只要我们把HTML页面放在classpath:/templates/,thymeleaf就能自动渲染
4、SpringMVC自动配置
1. Spring MVC auto-configuration
Spring Boot 自动配置好了SpringMVC
以下是SpringBoot对SpringMVC的默认配置:==(WebMvcAutoConfiguration)==
Inclusion of
ContentNegotiatingViewResolver
andBeanNameViewResolver
beans.自动配置了ViewResolver(视图解析器:根据方法的返回值得到视图对象(View),视图对象决定如何渲染(转发?重定向?))
ContentNegotiatingViewResolver:组合所有的视图解析器的;
==如何定制:我们可以自己给容器中添加一个视图解析器;自动的将其组合进来;==
Support for serving static resources, including support for WebJars (see below).静态资源文件夹路径,webjars
Static
index.html
support. 静态首页访问Custom
Favicon
support (see below). favicon.ico
自动注册了 of
Converter
,GenericConverter
,Formatter
beans.Converter:转换器; public String hello(User user):类型转换使用Converter
Formatter
格式化器; 2017.12.17===Date;
@Bean
@ConditionalOnProperty(prefix = "spring.mvc", name = "date-format")//在文件中配置日期格式化的规则
public Formatter<Date> dateFormatter() {
return new DateFormatter(this.mvcProperties.getDateFormat());//日期格式化组件
}
==自己添加的格式化器转换器,我们只需要放在容器中即可==
Support for
HttpMessageConverters
(see below).HttpMessageConverter:SpringMVC用来转换Http请求和响应的;User---Json;
HttpMessageConverters
是从容器中确定;获取所有的HttpMessageConverter;==自己给容器中添加HttpMessageConverter,只需要将自己的组件注册容器中(@Bean,@Component)==
Automatic registration of
MessageCodesResolver
(see below).定义错误代码生成规则Automatic use of a
ConfigurableWebBindingInitializer
bean (see below).==我们可以配置一个ConfigurableWebBindingInitializer来替换默认的;(添加到容器)==
初始化WebDataBinder;
请求数据=====JavaBean;
org.springframework.boot.autoconfigure.web:web的所有自动场景;
If you want to keep Spring Boot MVC features, and you just want to add additional MVC configuration (interceptors, formatters, view controllers etc.) you can add your own @Configuration
class of type WebMvcConfigurerAdapter
, but without @EnableWebMvc
. If you wish to provide custom instances of RequestMappingHandlerMapping
, RequestMappingHandlerAdapter
or ExceptionHandlerExceptionResolver
you can declare a WebMvcRegistrationsAdapter
instance providing such components.
If you want to take complete control of Spring MVC, you can add your own @Configuration
annotated with @EnableWebMvc
.
2、扩展SpringMVC
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