public class ThymeleafLayoutInterceptor extends HandlerInterceptorAdapter {
private static final String DEFAULT_LAYOUT = "layouts/default";
private static final String DEFAULT_VIEW_ATTRIBUTE_NAME = "view";
private String defaultLayout = DEFAULT_LAYOUT;
private String viewAttributeName = DEFAULT_VIEW_ATTRIBUTE_NAME;
public void setDefaultLayout(String defaultLayout) {
Assert.hasLength(defaultLayout);
this.defaultLayout = defaultLayout;
}
public void setViewAttributeName(String viewAttributeName) {
Assert.hasLength(defaultLayout);
this.viewAttributeName = viewAttributeName;
}
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
if (!modelAndView.hasView()) {
return;
}
String originalViewName = modelAndView.getViewName();
if (isRedirectOrForward(originalViewName)) {
return;
}
String layoutName = getLayoutName(handler);
modelAndView.setViewName(layoutName);
modelAndView.addObject(this.viewAttributeName, originalViewName);
}
private boolean isRedirectOrForward(String viewName) {
return viewName.startsWith("redirect:") || viewName.startsWith("forward:");
}
private String getLayoutName(Object handler) {
HandlerMethod handlerMethod = (HandlerMethod) handler;
Layout layout = getMethodOrTypeAnnotation(handlerMethod);
if (layout == null) {
return this.defaultLayout;
} else {
return layout.value();
}
}
private Layout getMethodOrTypeAnnotation(HandlerMethod handlerMethod) {
Layout layout = handlerMethod.getMethodAnnotation(Layout.class);
if (layout == null) {
return handlerMethod.getBeanType().getAnnotation(Layout.class);
}
return layout;
}
}
3：配置interceptor：
@Configuration
public class WebMvcConfig extends WebMvcConfigurationSupport {
@Override
protected void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(new ThymeleafLayoutInterceptor());
}
}
4：测试类：
@Controller
class SigninController {
@Layout(value = "layouts/blank")
@RequestMapping(value = "signin")
String signin() {
return "signin/signin";
}
}
5：测试布局模板页面：
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org">
<head>...</head>
<body>
<div th:raplace="fragments/header :: header">
Header
</div>
<div th:replace="${view} :: content">
Content
</div>
<div th:replace="fragments/footer :: footer">
Footer
</div>
</body>
</html>
6：测试内容模板页面：
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org">
<head>...</head>
<body>
<div class="container" th:fragment="content">
<!-- /* Handle the flash message */-->
<th:block th:if="${message != null}">
<div th:replace="fragments/alert :: alert (type=${#strings.toLowerCase(message.type)}, message=${message.message})"> </div>
</th:block>
<p>
Hello <span th:text="${#authentication.name}">User</span>!
Welcome to the Spring MVC Quickstart application!
</p>
</div>
</body>
</html>