通過maven建立springboot專案啟動出現404

• application.properties配置

spring.mvc.view.prefix=/WEB-INF/jsp/
spring.mvc.view.suffix=.jsp
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• 專案結構

• 控制器方法

package com.example.demo.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
public class IndexController {

    @RequestMapping("/")
    public String index() {
        return "index";
    }
}

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• 啟動專案訪問localhost:8080，出現404

Whitelabel Error Page
This application has no explicit mapping for /error, so you are seeing this as a fallback.

Thu Feb 28 22:59:29 CST 2019
There was an unexpected error (type=Not Found, status=404).
No message available
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解決方法

• pom.xml新增依賴

<dependency>
	<groupId>org.apache.tomcat.embed</groupId>
	<artifactId>tomcat-embed-jasper</artifactId>
</dependency>
<dependency>
	<groupId>javax.servlet</groupId>
	<artifactId>jstl</artifactId>
</dependency>
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• clean並重新整理maven

• 重啟並訪問localhost:8080

打包為jar執行仍然出現404

• 打包外掛版本設定為1.4.2.RELEASE，並且配置好資源目錄

<build>
	<resources>
		<resource>
			<directory>src/main/webapp</directory>
			<!--這裡必須是META-INF/resources-->
			<targetPath>META-INF/resources</targetPath>
			<includes>
				<include>**/**</include>
			</includes>
			<filtering>false</filtering>
		</resource>
	</resources>
	<plugins>
		<plugin>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-maven-plugin</artifactId>
			<version>1.4.2.RELEASE</version>
		</plugin>
	</plugins>
</build>
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