SpringBoot 笔记 (四): web 开发 1、SpringBoot对静态资源的映射规则 1 2 3 4 5 6 @ConfigurationProperties(prefix = "spring.resources", ignoreUnknownFields = false) public class ResourceProperties implements ResourceLoaderAware { private static final String[] CLASSPATH_RESOURCE_LOCATIONS = { "classpath:/META-INF/resources/" , "classpath:/resources/" , "classpath:/static/" , "classpath:/public/" };
MVC的自动配置 :WebMvcAuotConfiguration
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 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(); if (!registry.hasMappingForPattern(staticPathPattern)) { customizeResourceHandlerRegistration( registry.addResourceHandler(staticPathPattern) .addResourceLocations( this .resourceProperties.getStaticLocations()) .setCachePeriod(cachePeriod)); } } @Bean public WelcomePageHandlerMapping welcomePageHandlerMapping ( ResourceProperties resourceProperties) { return new WelcomePageHandlerMapping(resourceProperties.getWelcomePage(), this .mvcProperties.getStaticPathPattern()); } @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 ); 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 例如: localhost:8080/webjars/jquery/3.3.1/jquery.js
1 2 3 4 5 6 在访问的时候只需要写webjars下面资源的名称即可 <dependency > <groupId > org.webjars</groupId > <artifactId > jquery</artifactId > <version > 3.3.1</version > </dependency >
2)、”/**” 这个 路径的意思就是如果没有拦截器或者Servlet去处理的请求我们就映射到这个地方来,访问当前项目的任何资源,都去(静态资源的文件夹)找映射
1 2 3 4 5 "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
2、模板引擎 JSP、Velocity、Freemarker、Thymeleaf 但是SpringBoot推荐的Thymeleaf:语法更简单,功能更强大。
1、引入thymeleaf; 1 2 3 4 5 6 7 8 9 10 11 12 <dependency > <groupId > org.springframework.boot</groupId > <artifactId > spring-boot-starter-thymeleaf</artifactId > 2.1.6 </dependency > <properties > <thymeleaf.version > 3.0.9.RELEASE</thymeleaf.version > <thymeleaf-layout-dialect.version > 2.2.2</thymeleaf-layout-dialect.version > </properties >
2、Thymeleaf使用 1 2 3 4 5 6 7 8 9 10 11 @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;
步骤: 1、导入thymeleaf的名称空间 为了语法提示!
1 <html lang ="en" xmlns:th ="http://www.thymeleaf.org" >
2、使用thymeleaf语法 在controller中的参数放入一个Map或者ModelAndView对象,然后我们直接在里面put数据,接着我们在返回值返回的时候只需要返回这个模板的逻辑名就行了。
1 2 3 4 5 6 7 8 9 10 11 12 <!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 > <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
1. ${…} 获取值 底层就是OGNL表达式:属性调用,数组调用,方法调用,方法传参
1)、获取对象的属性、调用方法、数组的取值 ${obj.name} ${obj[‘name’]}
2)、使用内置的基本对象 1 2 3 4 5 6 7 #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.
对象必须是采用 # 来引用
3)、内置的一些工具对象: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 #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).
2.*{..} 这个东西其实和 ${} 是一样的,但是他多了一个辅助功能就是我们在一个标签中使用了 th:object="obj"
来指定一个对象的时候,我们在这个标签里面可以直接用 *{user}
来用 *
代替我们上面的那个 obj 对象,也就是我们可以简化书写。
1 2 3 4 5 <div th:object ="${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 >
3.#{..} 这个是用来取国际化内容的
4.@{…} 定义URL,@{/order/process(execId=${execId},execType='FAST')}
就可以表示当前项目下面的一个url 就类似我们的 @GetMapping 里面的映射一样,然后我们的参数就不用使用 ?
来拼接字符串了,直接使用圆括号即可。
5.~{…} 片段引用表达式
1 <div th:insert ="~{commons :: main}" > ...</div >
6.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 ,…
7.Text operations:(文本操作) String concatenation: + Literal substitutions: |The name is ${name}|
8.Arithmetic operations:(数学运算) Binary operators: + , - , * , / , % Minus sign (unary operator): -
9.Boolean operations:(布尔运算) Binary operators: and , or Boolean negation (unary operator): ! , not
10.Comparisons and equality:(比较运算) Comparators: > , < , >= , <= ( gt , lt , ge , le ) Equality operators: == , != ( eq , ne )
11.Conditional operators:条件运算(三元运算符) If-then: (if) ? (then) If-then-else: (if) ? (then) : (else) Default: (value) ?: (defaultvalue)
12.Special tokens: No-Operation: _
13.foreach 1 2 3 4 5 6 7 8 <div th:each ="user:${users}" > <div th:text ="${user}" > </div > 或者使用行内写法 <div > [[${user}]] text 会转义 [(${user})] utext 不转义字符 </div > </div >
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
注入了 ContentNegotiatingViewResolver
and BeanNameViewResolver
的 bean.
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,也就是把容器中所有的视图解析器都放到一块,也就是放到自己的一个集合里面,我们可以在debug的时候去DispatcherServlet 这个地方查看到我们的视图解析器,然后在挑选出一个最合适的视图解析器工作,处理视图。
如何定制自己的视图解析器?:我们可以自己给容器中添加一个视图解析器(实现了ViewResolver接口的类),ContentNegotiatingViewResolver
自动的将其组合进来,放到自己的容器里面。
静态资源文件夹路径,webjars
静态首页访问,index 页面
自定义 favicon.ico 图标
自动注册了 Converter
, GenericConverter
, Formatter
组件
Converter:转换器就是把网页提交过来的参数转化成我们需要的类型 public String hello(User user):类型转换使用Converter
Formatter
格式化器,2017.12.17===Date。自己添加的格式化器转换器,我们只需要放在容器中即可,然后配置一下对应的配置文件就行 。
1 2 3 4 5 @Bean @ConditionalOnProperty(prefix = "spring.mvc", name = "date-format") public Formatter<Date> dateFormatter () { return new DateFormatter(this .mvcProperties.getDateFormat()); }
HttpMessageConverters
Http 请求响应转换。
HttpMessageConverter:SpringMVC用来转换Http请求和响应的,User—Json
HttpMessageConverters
是从容器中确定,从容器中自动获取所有的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)
MessageCodesResolver
.定义错误代码生成规则,我们也可以手动的配置,就是向容器中添加bean
使用了 ConfigurableWebBindingInitializer
组件到容器里面。我们可以配置一个ConfigurableWebBindingInitializer来替换默认的,添加到容器。这个东西的功能就是把我们页面提交过来的数据与我们的JavaBean的属性来做绑定,就是我们在 Spring中看到的 WebBinder
。
注意:org.springframework.boot.autoconfigure.web这个包里面有所有的web自动配置场景
可以看出来我们的SpringBoot的自动配置基本就是使用 AutoConfiguration 来向容器中添加Bean,条件就是如果容器中没有这个 bean 的话。然后就是如果是这个组价可以存在多个,我们配置的bean就会被SpringBoot给整合掉,形成在一起。
如果说我们想要保留 springboot 的对 mvc 的自动配置,并且希望添加一些新的功能(interceptors, formatters, view controllers etc.)我们可能就要添加自己的配置类,也就是有 @Configuration
的 WebMvcConfigurerAdapter
子类。但是不要有 @EnableWebMvc
因为这个注解是完全的接管 mvc 的配置。 MVC configuration
2、扩展SpringMVC 编写一个配置类(@Configuration),是WebMvcConfigurerAdapter类型,但是这个类不能标注@EnableWebMvc注解 ,这样的话我们既保留了所有的自动配置,也能用我们扩展的配置。
1 2 3 4 5 6 7 8 9 10 11 12 @Configuration public class MyMvcConfig extends WebMvcConfigurerAdapter { @Override public void addViewControllers (ViewControllerRegistry registry) { registry.addViewController("/hello" ).setViewName("success" ); } }
原理:
1)、WebMvcAutoConfiguration是SpringMVC的自动配置类
2)、在做其他自动配置时会导入 @Import(EnableWebMvcConfiguration .class) 这个类
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 @Configuration public static class EnableWebMvcConfiguration extends DelegatingWebMvcConfiguration { private final WebMvcConfigurerComposite configurers = new WebMvcConfigurerComposite(); @Autowired(required = false) public void setConfigurers (List<WebMvcConfigurer> configurers) { if (!CollectionUtils.isEmpty(configurers)) { this .configurers.addWebMvcConfigurers(configurers); @Override } } }
3)、容器中所有的WebMvcConfigurer都会一起起作用
4)、我们的配置类也会被调用;
效果:SpringMVC的自动配置和我们的扩展配置都会起作用;
3、全面接管SpringMVC; SpringBoot对SpringMVC的自动配置不需要了,所有都是我们自己配置;所有的SpringMVC的自动配置都失效了
我们需要在配置类中添加@EnableWebMvc即可;
1 2 3 4 5 6 7 8 9 10 11 12 @EnableWebMvc @Configuration public class MyMvcConfig extends WebMvcConfigurerAdapter { @Override public void addViewControllers (ViewControllerRegistry registry) { registry.addViewController("/atguigu" ).setViewName("success" ); } }
原理:
为什么@EnableWebMvc自动配置就失效了;
1)@EnableWebMvc的核心,就是帮我们导入这个类,帮我们做一些基本的配置。
1 2 @Import(DelegatingWebMvcConfiguration.class) public @interface EnableWebMvc {
2)、
1 2 @Configuration public class DelegatingWebMvcConfiguration extends WebMvcConfigurationSupport {
3)、
1 2 3 4 5 6 7 8 9 10 @Configuration @ConditionalOnWebApplication @ConditionalOnClass({ Servlet.class, DispatcherServlet.class, WebMvcConfigurerAdapter.class }) @ConditionalOnMissingBean(WebMvcConfigurationSupport.class) @AutoConfigureOrder(Ordered.HIGHEST_PRECEDENCE + 10) @AutoConfigureAfter({ DispatcherServletAutoConfiguration.class, ValidationAutoConfiguration.class }) public class WebMvcAutoConfiguration {
4)、@EnableWebMvc将WebMvcConfigurationSupport组件导入进来;
5)、导入的WebMvcConfigurationSupport只是SpringMVC最基本的功能;
5、如何修改SpringBoot的默认配置 模式:
1)、SpringBoot在自动配置很多组件的时候,先看容器中有没有用户自己配置的(@Bean、@Component)如果有就用用户配置的,如果没有,才自动配置;如果有些组件可以有多个(ViewResolver)将用户配置的和自己默认的组合起来;
2)、在SpringBoot中会有非常多的xxxConfigurer帮助我们进行扩展配置
3)、在SpringBoot中会有很多的xxxCustomizer帮助我们进行定制配置
6、RestfulCRUD 1)、默认访问首页 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 @Configuration public class MyMvcConfig extends WebMvcConfigurerAdapter { @Override public void addViewControllers (ViewControllerRegistry registry) { registry.addViewController("/hello" ).setViewName("success" ); } @Bean public WebMvcConfigurerAdapter webMvcConfigurerAdapter () { WebMvcConfigurerAdapter adapter = new WebMvcConfigurerAdapter() { @Override public void addViewControllers (ViewControllerRegistry registry) { registry.addViewController("/" ).setViewName("login" ); registry.addViewController("/index.html" ).setViewName("login" ); } }; return adapter; } }
2)、国际化 1)、编写国际化配置文件
2)、使用ResourceBundleMessageSource管理国际化资源文件
3)、在页面使用fmt:message取出国际化内容
步骤:
1)、编写国际化配置文件,抽取页面需要显示的国际化消息 2)、SpringBoot自动配置好了管理国际化资源文件的组件;
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 @ConfigurationProperties(prefix = "spring.messages") public class MessageSourceAutoConfiguration { private String basename = "messages" ; @Bean public MessageSource messageSource () { ResourceBundleMessageSource messageSource = new ResourceBundleMessageSource(); if (StringUtils.hasText(this .basename)) { messageSource.setBasenames(StringUtils.commaDelimitedListToStringArray( StringUtils.trimAllWhitespace(this .basename))); } if (this .encoding != null ) { messageSource.setDefaultEncoding(this .encoding.name()); } messageSource.setFallbackToSystemLocale(this .fallbackToSystemLocale); messageSource.setCacheSeconds(this .cacheSeconds); messageSource.setAlwaysUseMessageFormat(this .alwaysUseMessageFormat); return messageSource; }
3)、去页面获取国际化的值;
1 2 3 4 5 6 7 8 9 <!DOCTYPE html > <html lang ="en" xmlns:th ="http://www.thymeleaf.org" > <head > <link href ="asserts/css/bootstrap.min.css" th:href ="@{/webjars/bootstrap/4.0.0/css/bootstrap.css}" rel ="stylesheet" > <link href ="asserts/css/signin.css" th:href ="@{/asserts/css/signin.css}" rel ="stylesheet" > </head > <h1 class ="h3 mb-3 font-weight-normal" th:text ="#{login.tip}" > Please sign in</h1 >
效果:根据浏览器语言设置的信息切换了国际化;
原理:
国际化Locale(区域信息对象);LocaleResolver(获取区域信息对象);
1 2 3 4 5 6 7 8 9 10 11 12 13 @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
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 public class MyLocaleResolver implements LocaleResolver { @Override public Locale resolveLocale (HttpServletRequest request) { String l = request.getParameter("l" ); Locale locale = Locale.getDefault(); 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(); } }
3)、登陆 开发期间模板引擎页面修改以后,要实时生效
1)、禁用模板引擎的缓存
1 2 # 禁用缓存 spring.thymeleaf.cache=false
2)、页面修改完成以后ctrl+f9:重新编译;
登陆错误消息的显示
1 <p style ="color: red" th:text ="${msg}" th:if ="${not #strings.isEmpty(msg)}" > </p >
表单重复提交,我们使用post请求提交数据来到新的页面的时候如果我们再次刷新,就会询问我们是否需要重复提交表单数据,这样我们就可以登陆成功以后使用重定向来完成,而不是采用默认的行为。
4)、拦截器进行登陆检查 拦截器
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 public class LoginHandlerInterceptor implements HandlerInterceptor { @Override public boolean preHandle (HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { Object user = request.getSession().getAttribute("loginUser" ); if (user == null ){ request.setAttribute("msg" ,"没有权限请先登陆" ); request.getRequestDispatcher("/index.html" ).forward(request,response); return false ; }else { return true ; } } @Override public void postHandle (HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception { } @Override public void afterCompletion (HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception { } }
注册拦截器
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 @Bean 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("/main.html" ).setViewName("dashboard" ); } @Override public void addInterceptors (InterceptorRegistry registry) { registry.addInterceptor(new LoginHandlerInterceptor()).addPathPatterns("/**" ) .excludePathPatterns("/index.html" ,"/" ,"/user/login" ); } }; return adapter; }
5)、CRUD-员工列表 实验要求:
1)、RestfulCRUD:CRUD满足Rest风格;
URI: /资源名称/资源标识 HTTP请求方式区分对资源CRUD操作
普通CRUD(uri来区分操作)
RestfulCRUD
查询
getEmp
emp—GET
添加
addEmp?xxx
emp—POST
修改
updateEmp?id=xxx&xxx=xx
emp/{id}—PUT
删除
deleteEmp?id=1
emp/{id}—DELETE
2)、实验的请求架构;
实验功能
请求URI
请求方式
查询所有员工
emps
GET
查询某个员工(来到修改页面)
emp/1
GET
来到添加页面
emp
GET
添加员工
emp
POST
来到修改页面(查出员工进行信息回显)
emp/1
GET
修改员工
emp
PUT
删除员工
emp/1
DELETE
3)、员工列表:
thymeleaf公共页面元素抽取 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1、抽取公共片段 <div th:fragment ="copy" > © 2011 The Good Thymes Virtual Grocery</div > 2、引入公共片段 <div th:insert ="~{footer :: copy}" > </div > ~{templatename::selector}:模板名::选择器 ~{templatename::fragmentname}:模板名::片段名 3、默认效果: insert的公共片段在div标签中 如果使用th:insert等属性进行引入,可以不用写~{}: 行内写法可以加上:[[~{}]];[(~{})];
三种引入公共片段的th属性:
th:insert :将公共片段整个插入到声明引入的元素中
th:replace :将声明引入的元素替换为公共片段
th:include :将被引入的片段的内容包含进这个标签中
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 <footer th:fragment ="copy" > © 2011 The Good Thymes Virtual Grocery</footer > 引入方式 <div th:insert ="footer :: copy" > </div > <div th:replace ="footer :: copy" > </div > <div th:include ="footer :: copy" > </div > 效果 <div > <footer > © 2011 The Good Thymes Virtual Grocery </footer > </div > <footer > © 2011 The Good Thymes Virtual Grocery</footer > <div > © 2011 The Good Thymes Virtual Grocery</div >
引入片段的时候传入参数:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 <nav class ="col-md-2 d-none d-md-block bg-light sidebar" id ="sidebar" > <div class ="sidebar-sticky" > <ul class ="nav flex-column" > <li class ="nav-item" > <a class ="nav-link active" th:class ="${activeUri=='main.html'?'nav-link active':'nav-link'}" href ="#" th:href ="@{/main.html}" > <svg xmlns ="http://www.w3.org/2000/svg" width ="24" height ="24" viewBox ="0 0 24 24" fill ="none" stroke ="currentColor" stroke-width ="2" stroke-linecap ="round" stroke-linejoin ="round" class ="feather feather-home" > <path d ="M3 9l9-7 9 7v11a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2z" > </path > <polyline points ="9 22 9 12 15 12 15 22" > </polyline > </svg > Dashboard <span class ="sr-only" > (current)</span > </a > </li > <div th:replace ="commons/bar::#sidebar(activeUri='emps')" > </div >
6)、CRUD-员工添加 添加页面
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 <form > <div class ="form-group" > <label > LastName</label > <input type ="text" class ="form-control" placeholder ="zhangsan" > </div > <div class ="form-group" > <label > Email</label > <input type ="email" class ="form-control" placeholder ="zhangsan@atguigu.com" > </div > <div class ="form-group" > <label > Gender</label > <br /> <div class ="form-check form-check-inline" > <input class ="form-check-input" type ="radio" name ="gender" value ="1" > <label class ="form-check-label" > 男</label > </div > <div class ="form-check form-check-inline" > <input class ="form-check-input" type ="radio" name ="gender" value ="0" > <label class ="form-check-label" > 女</label > </div > </div > <div class ="form-group" > <label > department</label > <select class ="form-control" > <option > 1</option > <option > 2</option > <option > 3</option > <option > 4</option > <option > 5</option > </select > </div > <div class ="form-group" > <label > Birth</label > <input type ="text" class ="form-control" placeholder ="zhangsan" > </div > <button type ="submit" class ="btn btn-primary" > 添加</button > </form >
提交的数据格式不对:生日:日期;
2017-12-12;2017/12/12;2017.12.12;
日期的格式化;SpringMVC将页面提交的值需要转换为指定的类型;
2017-12-12—Date; 类型转换,格式化;
默认日期是按照/的方式;
7)、CRUD-员工修改 修改添加二合一表单
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 <form th:action ="@{/emp}" method ="post" > <input type ="hidden" name ="_method" value ="put" th:if ="${emp!=null}" /> <input type ="hidden" name ="id" th:if ="${emp!=null}" th:value ="${emp.id}" > <div class ="form-group" > <label > LastName</label > <input name ="lastName" type ="text" class ="form-control" placeholder ="zhangsan" th:value ="${emp!=null}?${emp.lastName}" > </div > <div class ="form-group" > <label > Email</label > <input name ="email" type ="email" class ="form-control" placeholder ="zhangsan@atguigu.com" th:value ="${emp!=null}?${emp.email}" > </div > <div class ="form-group" > <label > Gender</label > <br /> <div class ="form-check form-check-inline" > <input class ="form-check-input" type ="radio" name ="gender" value ="1" th:checked ="${emp!=null}?${emp.gender==1}" > <label class ="form-check-label" > 男</label > </div > <div class ="form-check form-check-inline" > <input class ="form-check-input" type ="radio" name ="gender" value ="0" th:checked ="${emp!=null}?${emp.gender==0}" > <label class ="form-check-label" > 女</label > </div > </div > <div class ="form-group" > <label > department</label > <select class ="form-control" name ="department.id" > <option th:selected ="${emp!=null}?${dept.id == emp.department.id}" th:value ="${dept.id}" th:each ="dept:${depts}" th:text ="${dept.departmentName}" > 1</option > </select > </div > <div class ="form-group" > <label > Birth</label > <input name ="birth" type ="text" class ="form-control" placeholder ="zhangsan" th:value ="${emp!=null}?${#dates.format(emp.birth, 'yyyy-MM-dd HH:mm')}" > </div > <button type ="submit" class ="btn btn-primary" th:text ="${emp!=null}?'修改':'添加'" > 添加</button > </form >
8)、CRUD-员工删除 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 <tr th:each ="emp:${emps}" > <td th:text ="${emp.id}" > </td > <td > [[${emp.lastName}]]</td > <td th:text ="${emp.email}" > </td > <td th:text ="${emp.gender}==0?'女':'男'" > </td > <td th:text ="${emp.department.departmentName}" > </td > <td th:text ="${#dates.format(emp.birth, 'yyyy-MM-dd HH:mm')}" > </td > <td > <a class ="btn btn-sm btn-primary" th:href ="@{/emp/}+${emp.id}" > 编辑</a > <button th:attr ="del_uri=@{/emp/}+${emp.id}" class ="btn btn-sm btn-danger deleteBtn" > 删除</button > </td > </tr > <script > $(".deleteBtn" ).click(function ( ) { $("#deleteEmpForm" ).attr("action" ,$(this ).attr("del_uri" )).submit(); return false ; }); </script >