How can I serve static html from spring boot

Question

I ran the spring-boot-sample-web-static project from here  made this alteration to the pom     lt dependency gt       lt groupId gt org springframework boot lt  groupId gt       lt artifactId gt spring-boot-starter-tomcat lt  artifactId gt   lt  dependency gt    And added this class to serve a duplicate page index2 html from the same static folder location   import org springframework http MediaType  import org springframework stereotype Controller  import org springframework web bind annotation RequestMapping  import org springframework web bind annotation ResponseBody    Controller public class Rester         RequestMapping value     rand   produces   MediaType APPLICATION JSON VALUE       ResponseBody     private RandomObj jsonEndpoint             return new RandomObj                RequestMapping value     tw       public String somePg             return  index2             The json url works fine  but when I try to access localhost 8080 tw I get a blank page  and this error in the console   2017-02-22 15 37 22 076 ERROR 21494 ---  nio-8080-exec-9  o s boot web support ErrorPageFilter       Cannot forward to error page for request   tw  as the response has already been committed  As a result  the response may have the wrong status code  If your application is running on WebSphere Application Server you may be able to resolve this problem by setting com ibm ws webcontainer invokeFlushAfterService to false   Am I doing something wrong

User · Answer

I had to add thymeleaf dependency to pom xml  Without this dependency Spring boot didn t find static resources    lt dependency gt       lt groupId gt org springframework boot lt  groupId gt       lt artifactId gt spring-boot-starter-thymeleaf lt  artifactId gt   lt  dependency gt

User · Answer

I am using    Spring Boot     v2 0 4 RELEASE  with Spring Framework 5     Spring Boot 2 0 requires Java 8 as a minimum version  Many existing APIs have been updated to take advantage of Java 8 features such as  default methods on interfaces  functional callbacks  and new APIs such as javax time    Static Content  By default  Spring Boot serves static content from a directory called  static  or  public or  resources or  META-INF resources  in the classpath or from the root of the ServletContext  It uses the ResourceHttpRequestHandler from Spring MVC so that you can modify that behavior by adding your own WebMvcConfigurer and overriding the addResourceHandlers method   By default  resources are mapped on     and located on  static directory  But you can customize the static loactions programmatically inside our web context configuration class    Configuration  EnableWebMvc public class Static ResourceHandler implements WebMvcConfigurer         Override     public void addResourceHandlers ResourceHandlerRegistry registry               When overriding default behavior  you need to add default    as well as added static paths  webapp               src main resources static             registry                addResourceHandler               css myStatic css              addResourceHandler   static             static css myStatic css              addResourceLocations  classpath  static       Default Static Loaction              setCachePeriod  3600                resourceChain true     4 1              addResolver new GzipResourceResolver       4 1              addResolver new PathResourceResolver       4 1             src main resources templates static             registry              addResourceHandler   templates             templates style css              addResourceLocations  classpath  templates static                 Do not use the src main webapp     directory if your application is packaged as a jar          registry              addResourceHandler   webapp             webapp css style css              addResourceLocations                   File located on disk         registry              addResourceHandler   system files                   addResourceLocations  file    D                http   localhost 8080 handlerPath resource-path name                      static          css myStatic css                      webapp          css style css                      templates       style css   In Spring every request will go through the DispatcherServlet  To avoid Static file request through DispatcherServlet Front contoller  we configure MVC Static content   As  STEEL said static resources should not go through Controller  Thymleaf is a ViewResolver which takes the view name form controller and adds prefix and suffix to View Layer

User · Answer

In Spring boot   META-INF resources    resources   static  and public  directories are available to serve static contents   So you can create a static  or public  directory under resources  directory and put your static contents there  And they will be accessible by  http   localhost 8080 your-file ext   assuming the server port is 8080   You can customize these directories using spring resources static-locations in the application properties   For example   spring resources static-locations classpath  custom    Now you can use custom  folder under resources  to serve static files   Update   This is also possible using java config    Configuration public class StaticConfig implements WebMvcConfigurer         Override     public void addResourceHandlers ResourceHandlerRegistry registry            registry addResourceHandler   static      addResourceLocations  classpath  custom               This confugration maps contents of custom directory to the http   localhost 8080 static    url

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As it is written before  some folders   META-INF resources    resources    static    public   serve static content by default  conroller misconfiguration can break this behaviour   It is a common pitfall that people define the base url of a controller in the  RestController annotation  instead of the  RequestMapping annotation on the top of the controllers   This is wrong    RestController   api base   public class MyController         PostMapping     public String myPostMethod           The above example will prevent you from opening the index html  The Spring expects a POST method at the root  because the myPostMethod is mapped to the     path   You have to use this instead    RestController  RequestMapping   api base   public class MyController         PostMapping     public String myPostMethod

User · Answer

You can quickly serve static content in JAVA Spring-boot App via thymeleaf  ref  source   I assume you have already added Spring Boot plugin apply plugin   org springframework boot  and the necessary buildscript  Then go ahead and ADD thymeleaf to your build gradle       dependencies       compile  org springframework boot spring-boot-starter-web       compile  org springframework boot spring-boot-starter-thymeleaf       testCompile  org springframework boot spring-boot-starter-test       Lets assume you have added home html at src main resources To serve this file  you will need to create a controller   package com ajinkya th controller     import org springframework stereotype Controller    import org springframework web bind annotation RequestMapping      Controller   public class HomePageController           RequestMapping            public String homePage             return  home                  Thats it   Now restart your gradle server    gradlew bootRun

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Static files should be served from resources  not from controller      Spring Boot will automatically add static web resources located within   any of the following directories    META-INF resources     resources     static     public     refs  https   spring io blog 2013 12 19 serving-static-web-content-with-spring-boot https   spring io guides gs serving-web-content

[java] How can I serve static html from spring boot?

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