基于thymeleaf实现简单登录1、引⼊thymeleaf、静态资源等依赖
    <dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.webjars</groupId>
<artifactId>jquery</artifactId>
<version>3.3.1</version>
</dependency>
<dependency>
<groupId>org.webjars</groupId>
<artifactId>bootstrap</artifactId>
<version>4.1.3</version>
</dependency>
    <!-- 模板引擎 Thymeleaf 依赖 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
2、欢迎页⾯及静态资源配置解析：WebMvcAutoConfiguration
public void addResourceHandlers(ResourceHandlerRegistry registry) {
if (!sourceProperties.isAddMappings()) {
logger.debug("Default resource handling disabled");
return;
}
Integer cachePeriod = CachePeriod();
if (!registry.hasMappingForPattern("/webjars/**")) {
customizeResourceHandlerRegistration(registry
.addResourceHandler("/webjars/**")
.addResourceLocations("classpath:/META-INF/resources/webjars/")
.setCachePeriod(cachePeriod));
}
String staticPathPattern = StaticPathPattern();
      //静态资源⽂件夹映射
if (!registry.hasMappingForPattern(staticPathPattern)) {
customizeResourceHandlerRegistration(
registry.addResourceHandler(staticPathPattern)
.addResourceLocations(
.setCachePeriod(cachePeriod));
}
}
    //配置欢迎页
@Beanthyme
public WelcomePageHandlerMapping welcomePageHandlerMapping(
ResourceProperties resourceProperties) {
return new WelcomePage(), StaticPathPattern());
}
public Resource getWelcomePage() {
for (String location : getStaticWelcomePageLocations()) {
Resource resource = Resource(location);
try {
if (ists()) {
return resource;
}
}
catch (Exception ex) {
// Ignore
}
}
return null;
}
private String[] getStaticWelcomePageLocations() {
String[] result = new String[this.staticLocations.length];
for (int i = 0; i < result.length; i++) {
String location = this.staticLocations[i];
if (!dsWith("/")) {
location = location + "/";
}
result[i] = location + "index.html";
}
3、注册templates主页⾯访问路径/、/index
public class MyConfig {
@Bean
public WebMvcConfigurerAdapter webMvcConfigurerAdapter(){
WebMvcConfigurerAdapter webMvcConfigurerAdapter =new WebMvcConfigurerAdapter(){
public void addViewControllers(ViewControllerRegistry registry) {
// TODO Auto-generated method stub
registry.addViewController( "/").setViewName("index");
registry.addViewController( "/index.html").setViewName("index");
}
return webMvcConfigurerAdapter;
}
4、index.html
<html lang="en" xmlns:th="">
<head>
<meta 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="Mark Otto, Jacob Thornton, and Bootstrap contributors">
<meta name="generator" content="Jekyll v3.8.5">
<title>Signin Template · Bootstrap</title>
<!-- Bootstrap core CSS -->
<link href="/docs/4.2/dist/css/bootstrap.min.css" rel="stylesheet" th:href="@{/webjars/bootstrap/4.1.3/css/bootstrap.min.css}" crossorigin="anonymous">
<style>
.bd-placeholder-img {
font-size: 1.125rem;
text-anchor: middle;
}
@media (min-width: 768px) {
.bd-placeholder-img-lg {
font-size: 3.5rem;
}
}
</style>
<!-- Custom styles for this template -->
<link th:href="@{assert/css/signin.css}" rel="stylesheet">
</head>
<body class="text-center">
<form class="form-signin" th:action="@{/toLogin}">
<img class="mb-4" th:src="@{/assert/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>
<p th:text="${msg}" th:if="${not #strings.isEmpty(msg)}"></p>
<label class="sr-only" th:text="#{login.username}">Username</label>
<input type="text" name="username"class="form-control" th:placeholder="#{login.username}" required autofocus>
<label for="inputPassword"class="sr-only" th:text="#{login.password}">Password</label>
<input type="password" name="password" id="inputPassword"class="form-control" th:placeholder="#{login.password}" required>  <div class="checkbox mb-3">
<label>
<input type="checkbox" value="remember-me"> [[#{ber}]]
</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>
</form>
</body>
</html>
5、LoginController
public class LoginController {
@RequestMapping(value = "/toLogin")
public String toLogin(@PathParam(value = "username") String username,            @PathParam(value = "password") String password,
Map<String, Object> map, HttpSession session) {
if(!StringUtils.isEmpty(username)&&"123456".equals(password)){
session.setAttribute("loginUser", username);
return"redirect:/main";
}else {
map.put("msg", "⽤户或密码不正确");
return"index";
}
}
6、⽤LoginInterceptor简单实现未登录返回主页⾯
public class LoginInterceptor implements HandlerInterceptor{
@Override
public boolean preHandle(HttpServletRequest request,
HttpServletResponse response, Object handler) throws Exception {        HttpSession session = Session();
Object user = Attribute("loginUser");
if(user == null){
request.setAttribute("msg", "请先登录");
return false;
}
return true;
}
@Override
public void postHandle(HttpServletRequest request,
HttpServletResponse response, Object handler,
ModelAndView modelAndView) throws Exception {
// TODO Auto-generated method stub
}
@Override
public void afterCompletion(HttpServletRequest request,
HttpServletResponse response, Object handler, Exception ex)
throws Exception {
// TODO Auto-generated method stub
}
}
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