SpringBoot个人笔记-szs

一.使用thymeleaf模板引擎来指定所需资源的位置

可以做到当项目名进行更改后,模板引擎也会进行更新相关的路径;如下图展示,会自动添加crud根目录!

<!-- Bootstrap core CSS -->

		<link href="asserts/css/bootstrap.min.css"th:href="@{/webjars/bootstrap/4.0.0/css/bootstrap.css}" rel="stylesheet">

<!--img的索引路径,使用th:src进行辅助说明-->

	<img class="mb-4" th:src="@{/asserts/img/bootstrap-solid.svg}" src="asserts/img/bootstrap-solid.svg" alt="" width="72" height="72">

application.properties

server.context-path=/crud

运行测试:(查看网页源代码)

		<!-- Bootstrap core CSS -->

		<link href="/crud/webjars/bootstrap/4.0.0/css/bootstrap.css"rel="stylesheet">

		<!-- Custom styles for this template -->

		<link href="/crud/asserts/css/signin.css"rel="stylesheet">

	</head>

	<body class="text-center">

		<form class="form-signin" action="dashboard.html">

			<img class="mb-4" src="/crud/asserts/img/bootstrap-solid.svg" alt="" width="72" height="72">

二、SpringBoot配置国际化资源页面

1.设置FileEncodings中的"default encoding for properties files "为utf-8选项,并且设置自动转换为ascil编码.

2.使用thymeleaf引擎语法添加消息编码头

<a class ="btn" th:href="@{/index.html(l='zh_CN)}">中文</a>

3.国际化Locale（区域信息对象）；LocaleResolver（获取区域信息对象）；

默认的就是根据请求头带来的区域信息获取Locale进行国际化

		@Bean

		@ConditionalOnMissingBean

		@ConditionalOnProperty(prefix = "spring.mvc", name = "locale")

		public LocaleResolver localeResolver() {

			if (this.mvcProperties

					.getLocaleResolver() == WebMvcProperties.LocaleResolver.FIXED) {

				return new FixedLocaleResolver(this.mvcProperties.getLocale());

			}

			AcceptHeaderLocaleResolver localeResolver = new AcceptHeaderLocaleResolver();

			localeResolver.setDefaultLocale(this.mvcProperties.getLocale());

			return localeResolver;

		}

默认的就是根据请求头带来的区域信息获取Locale进行国际化

4）、点击链接切换国际化

/**

 * 可以在连接上携带区域信息

 */

public class MyLocaleResolver implements LocaleResolver {

    @Override

    public Locale resolveLocale(HttpServletRequest request) {

        String l = request.getParameter("l");

        Locale locale = Locale.getDefault();  //在这里默认进行获得default,否则会null报错

        if(!StringUtils.isEmpty(l)){

            String[] split = l.split("_");

            locale = new Locale(split[0],split[1]);

        }

        return locale;

    }

    @Override

    public void setLocale(HttpServletRequest request, HttpServletResponse response, Locale locale) {

    }

}

 @Bean

    public LocaleResolver localeResolver(){

        return new MyLocaleResolver();

    }

}

三.禁用掉thymeleaf的缓存

可以做到刷新thymeleaf下的页面,否则更新代码后也不刷新;ctrl+F9,idea进行重新编译即可生效.

spring.thymeleaf.cache=false

四.指定国际化页面messages的目录

在application.properties中声明:

	spring.messages.basename=i18n.login

---------------------

login.btn=登陆~

login.password=密码~

login.remember=记住我~

login.tip=请登陆~

login.username=用户名~

五.thymeleaf的标准表达式简单使用#@$总结

(Standard Expression Syntax)

Simple expressions:（表达式语法）

Message Expressions: #{...}：获取国际化内容

Link URL Expressions: @{...}：定义URL；

    		@{/order/process(execId=${execId},execType='FAST')}

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

			.....

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>

 Fragment Expressions: ~{...}：片段引用表达式

    		<div th:insert="~{commons :: main}">...</div>

六.防止表单重复提交,可以重定向到主页dashboard

LoginController

  @PostMapping(value = "/user/login")//等价下面的写法

//    @RequestMapping(value = "/user/login",method = RequestMethod.POST)

    public String login(@RequestParam("username") String username,

                        @RequestParam("password") String password, Map<String,Object> map){

        if(!username.equals("")&&"123456".equals(password))

            return "redirect:/main.html";//登陆成功,防止表单重复提交.可以重定向到主页dashboard

        else {

            map.put("msg", "用户名或者密码错误");

            return "login";//登陆失败

        }

    }

WebMvcConfigurerAdapter

@Configuration

public class MvcConfig extends WebMvcConfigurerAdapter{

    //所有的WebMvcConfigurerAdapter组件都会一起起作用

    @Bean //将该组件注册到容器中

    public WebMvcConfigurerAdapter webMvcConfigurerAdapter(){

        WebMvcConfigurerAdapter adapter = new WebMvcConfigurerAdapter() {

            @Override

            public void addViewControllers(ViewControllerRegistry registry) {

                registry.addViewController("/").setViewName("login");

                registry.addViewController("/index.html").setViewName("login");

                registry.addViewController("/szs").setViewName("login");

                registry.addViewController("/main.html").setViewName("dashboard");

            }

        };

        return adapter;

    }

巴特西

SpringBoot -基础学习笔记 - 01