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.</version>
</dependency> <dependency>
<groupId>org.webjars</groupId>
<artifactId>bootstrap</artifactId>
<version>4.1.</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 (!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();
//静态资源文件夹映射
if (!registry.hasMappingForPattern(staticPathPattern)) {
customizeResourceHandlerRegistration(
registry.addResourceHandler(staticPathPattern)
.addResourceLocations(
this.resourceProperties.getStaticLocations())
.setCachePeriod(cachePeriod));
}
}
//配置欢迎页
@Bean
public WelcomePageHandlerMapping welcomePageHandlerMapping(
ResourceProperties resourceProperties) {
return new WelcomePageHandlerMapping(resourceProperties.getWelcomePage(),
this.mvcProperties.getStaticPathPattern());
}
public Resource getWelcomePage() {
for (String location : getStaticWelcomePageLocations()) {
Resource resource = this.resourceLoader.getResource(location);
try {
if (resource.exists()) {
resource.getURL();
return resource;
}
}
catch (Exception ex) {
// Ignore
}
}
return null;
}
private String[] getStaticWelcomePageLocations() {
String[] result = new String[this.staticLocations.length];
for (int i = ; i < result.length; i++) {
String location = this.staticLocations[i];
if (!location.endsWith("/")) {
location = location + "/";
}
result[i] = location + "index.html";
}
3、注册templates主页面访问路径/、/index
@Configuration
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
<!doctype html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<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: .125rem;
text-anchor: middle;
} @media (min-width: 768px) {
.bd-placeholder-img-lg {
font-size: .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="" height="">
<h1 class="h3 mb-3 font-weight-normal" th:text="#{login.tip}">Please sign in</h1> <p style="color: red" 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"> [[#{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">© -</p>
</form>
</body>
</html>
5、LoginController
@Controller
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)&&"".equals(password)){
session.setAttribute("loginUser", username);
return "redirect:/main";
}else {
map.put("msg", "用户或密码不正确");
return "index";
}
}
6、用拦截器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 = request.getSession();
Object user = session.getAttribute("loginUser");
if(user == null){
request.setAttribute("msg", "请先登录");
request.getRequestDispatcher("/").forward(request, response);
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
}
}
注册拦截器
@Configuration
public class MyConfig { @Bean
public WebMvcConfigurerAdapter webMvcConfigurerAdapter(){
WebMvcConfigurerAdapter webMvcConfigurerAdapter =new WebMvcConfigurerAdapter(){ ...... @Override
public void addInterceptors(InterceptorRegistry registry) {
// TODO Auto-generated method stub
registry.addInterceptor(new LoginInterceptor()).excludePathPatterns("/","/index.html","/toLogin");
} }; return webMvcConfigurerAdapter;
}
实现效果：
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