Spring Boot 2.x 静态资源访问404问题整理记录_spring addresourcehandlers 404

一、硬件环境

Windows 11 21H2
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二、软件环境

Maven 3.8.1
jdk1.8.0_40
IntelliJ IDEA 2021.3.3
Spring Boot 2.6.7
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三、POM配置文件

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.6.7</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </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-web</artifactId>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

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四、Spring Boot 静态资源目录

五、问题

1、打包方式

项目的打包类型分为：pom、jar、war

POM是最简单的打包类型。不像一个JAR，SAR，或者EAR，它生成的构件只是它本身，没有代码需要测试或者编译，也没有资源需要处理，打包类型为POM的项目的默认目标。

POM方式打包并没有将静态资源打包，所以无法访问静态资源

<packaging>pom</packaging>
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六、场景及解决方案

1、修改配置文件

（1）访问本地静态资源

适用场景：前后端未分离项目或需要访问项目内部html、js、img等静态资源。

spring:
  mvc:
  	# 访问路径不需要加前缀 http://127.0.0.1:8080/1.jpg
    static-path-pattern: /**
  web:
  	# 资源目录，多个用逗号分隔
    resources:
      static-locations: classpath:/META-INF/resources/,classpath:/resources/,classpath:/static/,classpath:/public/

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（2）发布本地目录

适用场景：项目中有图片上传、在线浏览等场景，需要挂载并发布本地目录

spring:
  mvc:
  	# 访问路径需要加前缀 http://127.0.0.1:8080/image/1.jpg
    static-path-pattern: /image/**
  web:
  	# 资源目录，多个用逗号分隔
    resources:
      static-locations: file:C:\SoftWare\Wallpaper
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2、实现WebMvcConfigurer

package com.example.demo.config;

import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.*;

@Configuration
class MyWebMvcConfig implements WebMvcConfigurer {

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        // 加载静态资源，访问路径不需要加前缀 http://127.0.0.1:8080/1.jpg
        registry.addResourceHandler("/**")
                .addResourceLocations("classpath:/static/")
                .addResourceLocations("classpath:/public/")
                .addResourceLocations("classpath:/resources/")
                .addResourceLocations("classpath:/META-INF/resources/");
        // 挂在本地目录，访问路径需要加前缀 http://127.0.0.1:8080/image/1.jpg
        registry.addResourceHandler("/image/**").addResourceLocations("file:C:/SoftWare/Wallpaper/");
        WebMvcConfigurer.super.addResourceHandlers(registry);
    }
}
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参考文献：

• https://blog.csdn.net/qq_41094332/article/details/108497080
• https://blog.csdn.net/syc000666/article/details/105110117
• https://blog.csdn.net/xiaozheng12/article/details/100517099