我的 Controller
@Controller
//@RequestMapping("/")
//@ComponentScan("com.spring")
//@EnableAutoConfiguration
public class HomeController {
@Value("${framework.welcomeMessage}")
private String message;
@RequestMapping("/hello")
String home(ModelMap model) {
System.out.println("hittin the controller...");
model.addAttribute("welcomeMessage", "vsdfgfgd");
return "Hello World!";
}
@RequestMapping(value = "/indexPage", method = RequestMethod.GET)
String index(ModelMap model) {
System.out.println("hittin the index controller...");
model.addAttribute("welcomeMessage", message);
return "welcome";
}
@RequestMapping(value = "/indexPageWithModel", method = RequestMethod.GET)
ModelAndView indexModel(ModelMap model) {
System.out.println("hittin the indexPageWithModel controller...");
model.addAttribute("welcomeMessage", message);
return new ModelAndView("welcome", model);
}
}
/WEB-INF/jsp 中的我的 JSP (welcome.jsp)(父文件夹是 WebContent)
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Welcome to Spring Boot</title>
</head>
<body>
<%@ taglib prefix="spring" uri="http://www.springframework.org/tags"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
Message: ${message}
</body>
</html>
我的 pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>SpringBootPlay</groupId>
<artifactId>SpringBootPlay</artifactId>
<version>0.0.1-SNAPSHOT</version>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.4.0.RELEASE</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
</dependency>
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-jasper</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>commons-logging</groupId>
<artifactId>commons-logging</artifactId>
<version>1.1.3</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-io</artifactId>
<version>1.3.2</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
<dependency>
<groupId>com.jcabi</groupId>
<artifactId>jcabi-log</artifactId>
<version>0.17</version>
</dependency>
</dependencies>
<properties>
<java.version>1.8</java.version>
<start-class>com.spring.play.BootLoader</start-class>
<main.basedir>${basedir}/../..</main.basedir>
<m2eclipse.wtp.contextRoot>/</m2eclipse.wtp.contextRoot>
</properties>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<configuration>
<useSystemClassLoader>false</useSystemClassLoader>
</configuration>
</plugin>
</plugins>
</build>
</project>
我的应用初始化器
@EnableAutoConfiguration
@SpringBootApplication
@ComponentScan({ "com.spring.controller" })
@PropertySources(value = { @PropertySource("classpath:/application.properties") })
public class BootLoader extends SpringBootServletInitializer {
final static Logger logger = Logger.getLogger(BootLoader.class);
@Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
return application.sources(BootLoader.class);
}
public static void main(String[] args) {
SpringApplication.run(BootLoader.class, args);
}
}
我什至在我的 pom.xml 中添加了 thymeleaf 依赖项。它仍然没有用。每当我点击 localhost:8080/hello 或/indexPage 或/indexPageWithModel 时，它总是说
白标错误页面
此应用程序没有/error 的显式映射，因此您将其视为后备。
美国东部时间 2016 年 9 月 21 日星期三 21:34:18 出现意外错误(类型=未找到，状态=404)。 ]/WEB-INF/jsp/welcome.jsp
我的 application.properties
spring.mvc.view.prefix: /WEB-INF/jsp/
spring.mvc.view.suffix: .jsp
framework.welcomeMessage=Welcome to Dashboard
请帮帮我。谢谢!
最佳答案
这是几乎所有 spring boot 初学者都会遇到的最常见错误之一。
对此的解决方案非常简单，- 您的 Bootstrap 类应该知道它应该引用的包或类路径，以便访问组件/ Controller 。因此，您需要指定如下:- @ComponentScan(basePackages= {"org.test.controller"})
P.S.- 这里的“org.test.controller”是我存放 Controller 的包的限定名称。
关于java - 为什么我在运行一个简单的 Spring Boot 应用程序时总是得到状态为 "404"的 Whitelabel 错误页面，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/39628930/