SpringBoot -基础学习笔记 - 01

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.

捕获1

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>

捕获

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;
    }
posted @ 2019-03-05 15:10  山枫叶纷飞  阅读(218)  评论(0)  编辑  收藏  举报