Question

我正在尝试使用提供的Spring boot starter软件包制作一个简单的spring Web应用程序。我可以在控制台中显示“ Hello World”，但是当我尝试打开localhost：（port）时，它正在显示给我。我正在使用JRE8。尝试使用JDK8，但也给我同样的错误。我们必须使用JDK还是JRE？

Whitelabel错误页面此应用程序没有针对/ error的显式映射，因此您将其视为后备。 2018年7月2日星期一21:58:01 发生意外错误（类型=未找到，状态= 404）。没有可用消息

我试图从最近2天开始解决此问题，但是我一直坚持下去！

请在下面找到我系统中包含的图像和代码。

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>

控制器。 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";

        }
}

Application.properties

server.port=8456

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

welcome.message: Hello Gami

运行应用程序时收到错误

Error Message

请任何帮助，真的很感激！

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会在配置的搜索路径中搜索带有@Controller注释的类，如果没有此注释，spring不会选择您的控制器类。

@Controller
public class WelcomeController { ... }

Answer 2

需要使用@RestController注释您的类，否则它将搜索welcome.jsp

Answer 3

JRE将没有编译器。使用JDK，它将具有javac，javap等开发工具。

springboot入门项目的初始设置-面临的问题

3 个答案: