------web开发----------
一. 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;
xxxxProperties:配置类来封装配置文件的内容;
xxxxAutoConfiguration:帮我们给容器中自动配置组件;
二. 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
-
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;
访问:localhost:8080/webjars/jquery/3.3.1/jquery.js
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
localhost:8080/abc ===那么它就会去 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;
三. 模板引擎Thymeleaf
1. 使用
(好像有版本问题要注意!)
@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;
测试:
然后在classpath:/templates/建一个success.html
<!DOCTYPE html>
<html >
<head>
<title>Title</title>
</head>
<body>
<h1>成功!</h1>
</body>
</html>
然后运行就可以了!
2. 语法规则
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
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: _
四. SpringMVC自动配置(不全!)
@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