Spring Boot : Whitelabel Error Page

╰半夏微凉° 2022-05-21 04:28 188阅读 0赞

# Spring Boot : Whitelabel Error Page解决方案 #

### 新搭建的Spring Boot，maven工程    ###

### pom文件 ###

<?xml version="1.0" encoding="UTF-8"?>
    <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
        <modelVersion>4.0.0</modelVersion>
    
        <groupId>com.adtec.springboot</groupId>
        <artifactId>first</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <packaging>jar</packaging>
    
        <name>first</name>
        <description>Demo project for Spring Boot</description>
    
        <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>2.0.3.RELEASE</version>
            <relativePath /> 
        </parent>
    
        <properties>
            <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
            <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
            <java.version>1.8</java.version>
        </properties>
    
        <dependencies>
            <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>
        </dependencies>
        
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                </plugin>
            </plugins>
        </build>
    
    
    </project>

### 入口程序 ###

package com.adtec.springbot.first;
    
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.web.bind.annotation.RequestMapping;
    @SpringBootApplication
    public class FirstApplication { 
    
        public static void main(String[] args) {
            SpringApplication.run(FirstApplication.class, args);
        }
         @RequestMapping("/home")
         public String index(){
         return "Hello Spring Boot";
         }
    }

### 启动日志 ###

.   ____          _            __ _ _
     /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \ ( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \  \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
      '  |____| .__|_| |_|_| |_\__, | / / / /
     =========|_|==============|___/=/_/_/_/
     :: Spring Boot ::        (v2.0.3.RELEASE)
    
    2018-06-29 17:47:41.162  INFO 13620 --- [           main] c.a.springbot.first.FirstApplication     : Starting FirstApplication on DESKTOP-5KCJ513 with PID 13620 (C:\Users\pc\Desktop\first\first\target\classes started by pc in C:\Users\pc\Desktop\first\first)
    2018-06-29 17:47:41.167  INFO 13620 --- [           main] c.a.springbot.first.FirstApplication     : No active profile set, falling back to default profiles: default
    2018-06-29 17:47:41.317  INFO 13620 --- [           main] ConfigServletWebServerApplicationContext : Refreshing org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@4c40b76e: startup date [Fri Jun 29 17:47:41 CST 2018]; root of context hierarchy
    2018-06-29 17:47:43.877  INFO 13620 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
    2018-06-29 17:47:43.930  INFO 13620 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
    2018-06-29 17:47:43.932  INFO 13620 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet Engine: Apache Tomcat/8.5.31
    2018-06-29 17:47:43.953  INFO 13620 --- [ost-startStop-1] o.a.catalina.core.AprLifecycleListener   : The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: [F:\soft\Java\jdk1.8.0_102\bin;C:\WINDOWS\Sun\Java\bin;C:\WINDOWS\system32;C:\WINDOWS;F:/soft/Java/jdk1.8.0_102/bin/../jre/bin/server;F:/soft/Java/jdk1.8.0_102/bin/../jre/bin;F:/soft/Java/jdk1.8.0_102/bin/../jre/lib/amd64;F:\soft\erl5.10.4\bin;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;F:\soft\Java\jdk1.8.0_102\bin;C:\Program Files\MySQL\MySQL Server 5.6\bin;F:\soft\apache-maven-3.5.0\bin;C:\Users\pc\Desktop\node-v8.4.0-win-x64\node-v8.4.0-win-x64;F:\soft\PuTTY\;F:\soft\TortoiseSVN\bin;F:\soft\Python\Python36;C:\Users\pc\AppData\Local\Microsoft\WindowsApps;;C:\Users\pc\Desktop\eclipse;;.]
    2018-06-29 17:47:44.202  INFO 13620 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
    2018-06-29 17:47:44.202  INFO 13620 --- [ost-startStop-1] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 2890 ms
    2018-06-29 17:47:44.527  INFO 13620 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean  : Servlet dispatcherServlet mapped to [/]
    2018-06-29 17:47:44.537  INFO 13620 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'characterEncodingFilter' to: [/*]
    2018-06-29 17:47:44.537  INFO 13620 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
    2018-06-29 17:47:44.537  INFO 13620 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'httpPutFormContentFilter' to: [/*]
    2018-06-29 17:47:44.537  INFO 13620 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'requestContextFilter' to: [/*]
    2018-06-29 17:47:44.760  INFO 13620 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
    2018-06-29 17:47:45.167  INFO 13620 --- [           main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@4c40b76e: startup date [Fri Jun 29 17:47:41 CST 2018]; root of context hierarchy
    2018-06-29 17:47:45.368  INFO 13620 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{ [/home]}" onto public java.lang.String com.adtec.springbot.first.FirstApplication.index()
    2018-06-29 17:47:45.381  INFO 13620 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{ [/error]}" onto public org.springframework.http.ResponseEntity<java.util.Map<java.lang.String, java.lang.Object>> org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController.error(javax.servlet.http.HttpServletRequest)
    2018-06-29 17:47:45.383  INFO 13620 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{ [/error],produces=[text/html]}" onto public org.springframework.web.servlet.ModelAndView org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)
    2018-06-29 17:47:45.434  INFO 13620 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
    2018-06-29 17:47:45.435  INFO 13620 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
    2018-06-29 17:47:45.904  INFO 13620 --- [           main] o.s.j.e.a.AnnotationMBeanExporter        : Registering beans for JMX exposure on startup
    2018-06-29 17:47:45.980  INFO 13620 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''
    2018-06-29 17:47:45.988  INFO 13620 --- [           main] c.a.springbot.first.FirstApplication     : Started FirstApplication in 5.364 seconds (JVM running for 6.034)
    2018-06-29 17:47:46.095  INFO 13620 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring FrameworkServlet 'dispatcherServlet'
    2018-06-29 17:47:46.095  INFO 13620 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : FrameworkServlet 'dispatcherServlet': initialization started
    2018-06-29 17:47:46.142  INFO 13620 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : FrameworkServlet 'dispatcherServlet': initialization completed in 47 ms

### 访问效果   ![这里写图片描述][70]    ###

### 问题原因：    ###

### 少了一个注解@RestController ###

package com.adtec.springbot.first;
    
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    @SpringBootApplication
    @RestController
    public class FirstApplication {
    
        public static void main(String[] args) {
            SpringApplication.run(FirstApplication.class, args);
        }
         @RequestMapping("/home")
         public String index(){
         return "Hello Spring Boot";
         }
    }

### 结果   ![这里写图片描述][70 1] ###

[70]: /images/20220521/f4778bd2d6a94361a8adc06c21ffb33c.png
[70 1]: /images/20220521/4046d6e0d926426683e80d10c379f3d2.png