一、做到默认访问首页

要扩展SpringBoot对SpringMVC的默认配置,可以实现WebMvcConfigurer接口,重写其中的方法,并将其注册到容器中。

//使用WebMvcConfigurerAdapter可以来扩展SpringMVC的功能
//@EnableWebMvc   不要接管SpringMVC
@Configuration
public class MyMvcConfig implements WebMvcConfigurer {


    //所有的WebMvcConfigurer组件都会一起起作用
    @Bean //将组件注册在容器
    public WebMvcConfigurer webMvcConfigurer(){
        WebMvcConfigurer webMvcConfigurer = new WebMvcConfigurer() {
            @Override
            public void addViewControllers(ViewControllerRegistry registry) {
                registry.addViewController("/").setViewName("login");
                registry.addViewController("/index.html").setViewName("login");
            }
        };
        return webMvcConfigurer;
    }
}

二、页面国际化

对登陆界面进行国际化操作:

1)、编写国际化配置文件;

2)、Springboot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

 

1)编写国际化配置文件,抽取页面需要显示的国际化消息

java springboot重写ResponseEntityExceptionHandler springboot restful_html

2)、SpringBoot自动配置好了管理国际化资源文件的组件;

@ConfigurationProperties(prefix = "spring.messages")
public class MessageSourceAutoConfiguration {
    
    /**
	 * Comma-separated list of basenames (essentially a fully-qualified classpath
	 * location), each following the ResourceBundle convention with relaxed support for
	 * slash based locations. If it doesn't contain a package qualifier (such as
	 * "org.mypackage"), it will be resolved from the classpath root.
	 */
	private String basename = "messages";  
    //我们的配置文件可以直接放在类路径下叫messages.properties;
    
    @Bean
	public MessageSource messageSource() {
		ResourceBundleMessageSource messageSource = new ResourceBundleMessageSource();
		if (StringUtils.hasText(this.basename)) {
            //设置国际化资源文件的基础名(去掉语言国家代码的)
			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;

<!DOCTYPE html>
<html lang="en"  xmlns:th="http://www.thymeleaf.org">
	<head>
		<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
		<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
		<meta name="description" content="">
		<meta name="author" content="">
		<title>Signin Template for Bootstrap</title>
		<!-- Bootstrap core CSS -->
		<link href="asserts/css/bootstrap.min.css" th:href="@{/webjars/bootstrap/4.0.0/css/bootstrap.css}" rel="stylesheet">
		<!-- Custom styles for this template -->
		<link href="asserts/css/signin.css" th:href="@{/asserts/css/signin.css}" rel="stylesheet">
	</head>

	<body class="text-center">
		<form class="form-signin" action="dashboard.html">
			<img class="mb-4" th:src="@{/asserts/img/bootstrap-solid.svg}" src="asserts/img/bootstrap-solid.svg" alt="" width="72" height="72">
			<h1 class="h3 mb-3 font-weight-normal" th:text="#{login.tip}">Please sign in</h1>
			<label class="sr-only" th:text="#{login.username}">Username</label>
			<input type="text" class="form-control" placeholder="Username" th:placeholder="#{login.username}" required="" autofocus="">
			<label class="sr-only" th:text="#{login.password}">Password</label>
			<input type="password" class="form-control" placeholder="Password" th:placeholder="#{login.password}" required="">
			<div class="checkbox mb-3">
				<label>
          		<input type="checkbox" value="remember-me"/> [[#{login.remember}]]
        </label>
			</div>
			<button class="btn btn-lg btn-primary btn-block" type="submit" th:text="#{login.btn}">Sign in</button>
			<p class="mt-5 mb-3 text-muted">© 2017-2018</p>
			<a class="btn btn-sm">中文</a>
			<a class="btn btn-sm">English</a>
		</form>

	</body>

</html>

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);

@Bean
//如果容器中没有LocaleResolver的话Springboot再让此配置类注入到容器中
//所以我们可以自己写一个LocaleResolver注入到容器中
@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)、实现点击链接切换国际化

自己写一个LocaleResolver组件注入到容器中,代替SpringBoot做的默认配置。

/**
 * 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();
        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) {

    }
}

配置其到容器中,

//再SpringMVC的扩展配置类下 

@Bean
    public LocaleResolver localeResolver(){
        return new MyLocaleResolver();
    }
}

三、登陆

开发期间模板引擎的页面修改后,想让其实时生效:

1)在配置文件中禁用模板引擎的缓存

# 禁用缓存
spring.thymeleaf.cache=false

2)页面修改之后在IDEA中按ctrl+f9进行重新编译

 

登陆错误消息的显示:

<p style="color: red" th:text="${msg}" th:if="${not #strings.isEmpty(msg)}"></p>

四、避免用户通过URL直接访问主界面,配置拦截器进行登陆检查

我们自己写一个springMVC的拦截器

/**
 * 登陆检查,
 */
public class LoginHandlerInterceptor implements HandlerInterceptor {
    //目标方法执行之前
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        Object user = request.getSession().getAttribute("loginUser");
        if(user == null){
            //未登陆,返回登陆页面
            request.setAttribute("msg","没有权限请先登陆");
            request.getRequestDispatcher("/index.html").forward(request,response);
            return false;
        }else{
            //已登陆,放行请求
            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 {

    }
}

在SpringMVC配置类中注册拦截器

public void addInterceptors(InterceptorRegistry registry) {
       //super.addInterceptors(registry);
       //静态资源;  *.css , *.js
      registry.addInterceptor(new LoginHandlerInterceptor()).addPathPatterns("/**")
                        .excludePathPatterns("/index.html","/","/user/login",
                                            "/asserts/**","/webjars/**");
            }
        };

不能拦截进入登录界面、登陆、以及对静态资源的请求

五、关于Restful风格的介绍以及架构

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)使用themleaf抽取公共页面元素

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

<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>

引入的时候可以传参数,可以实现点击哪个侧边栏的项哪个项就高亮

<!--引入侧边栏;传入参数-->
<div th:replace="commons/bar::#sidebar(activeUri='emps')"></div>

在被引入的片段中的class标签中做三元运算判断

<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>

六、添加页面的实现

<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>

这里要注意,SpringBoot给SpringMVC默认自动配置了conventer类型转换器,对String--》Date类型的转换,但SpringBoot默认配置的日期格式以  /  分隔,如  2019/1/1

七、员工修改

修改我们要用put方式的请求,所以要在form表单中method以post方式,并添加一个隐藏域,name固定为_method,value为put,

Springboot的HiddenHttpMethodFielter会起作用,将其转为put请求方式。在Controller中用@PutMapping即可。

<!--需要区分是员工修改还是添加;-->
<form th:action="@{/emp}" method="post">
    <!--发送put请求修改员工数据-->
    <!--
1、SpringMVC中配置HiddenHttpMethodFilter;(SpringBoot自动配置好的)
2、页面创建一个post表单
3、创建一个input项,name="_method";值就是我们指定的请求方式
-->
    <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}?${emp.gender==0}">
            <label class="form-check-label">女</label>
        </div>
    </div>
    <div class="form-group">
        <label>department</label>
        <!--提交的是部门的id-->
        <select class="form-control" name="department.id">
            <option th:selected="${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>

 不同的请求方式在Controller中都有对应的不同注解,如@GetMapping,@PostMapping,@PutMapping,@DeleteMapping。