java - 初始 Spring Boot 启动项目设置 - 面临的问题

Question

我正在尝试使用提供的 Spring boot 入门包制作一个简单的 Spring Web 应用程序。我能够在控制台中显示“Hello World”，但是当我尝试打开 localhost:(port) 时，它向我显示 .我正在使用 JRE 8。尝试使用 JDK8 但也给了我同样的错误。我们必须使用 JDK 还是 JRE 吗？

Whitelabel Error Page This application has no explicit mapping for /error, so you are seeing this as a fallback. Mon Jul 02 21:58:01 MDT 2018 There was an unexpected error (type=Not Found, status=404). No message available

我试图解决过去两天的这个问题，但我陷入了困境!。

请找到我系统中的以下图像和代码。

Project Structure

Spring Starter 项目应用程序 .java

package com.gami.mvc;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;

@SpringBootApplication
public class SpringStarterProjectApplication extends SpringBootServletInitializer{

    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
        return application.sources(SpringStarterProjectApplication.class);
    }

    public static void main(String[] args) {
        SpringApplication.run(SpringStarterProjectApplication.class, args);
        System.out.println("Hello World");
    }
}

Pom.Xml 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.gami.mvc</groupId>
    <artifactId>springStarterProject</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>springStarterProject</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 /> <!-- lookup parent from repository -->
    </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>

    <!-- This is a web application -->

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!-- Tomcat embedded container -->

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>


        <!-- JSTL for JSP -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
        </dependency>

        <!-- Need this to compile JSP -->

        <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-jasper</artifactId>
            <scope>provided</scope>
        </dependency>

        <!-- Optional, test for static content, bootstrap CSS -->

        <dependency>
            <groupId>org.webjars</groupId>
            <artifactId>bootstrap</artifactId>
            <version>3.3.7</version>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>


</project>

Controller 。 java

package com.gami.mvc;

import java.util.Map;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.RequestMapping;

public class WelcomeController {

    // inject via application.properties
        @Value("${welcome.message:test}")
        private String message = "Hello World";

        @RequestMapping("/")
        public String welcome(Map<String, Object> model) {
            model.put("message", this.message);
            return "welcome";

        }
}

应用程序属性

server.port=8456

spring.mvc.view.prefix: /WEB-INF/jsp/
spring.mvc.view.suffix: .jsp

welcome.message: Hello Gami

运行应用程序时接收错误

Error Message

请提供任何帮助，非常感谢!

谢谢 哈迪克·加米 Console Image

Console msg after hitting to local host

Java Build Path Error

Java 构建路径 - Eclipse Java Build Path of Project

Answer 1

Spring 将在配置的搜索路径上搜索带有 @Controller 注解的类，如果没有此注解，Spring 将不会获取您的 Controller 类。

@Controller
public class WelcomeController { ... }