https://blog.csdn.net/fzy629442466/article/details/131835539?ops_request_misc=%257B%2522request%255Fid%2522%253A%2522170225859316800197059584%2522%252C%2522scm%2522%253A%252220140713.130102334.pc%255Fblog.%2522%257D&request_id=170225859316800197059584&biz_id=0&utm_medium=distribute.pc_search_result.none-task-blog-2~blog~first_rank_ecpm_v1~rank_v31_ecpm-1-131835539-null-null.nonecase&utm_term=resources&spm=1018.2226.3001.4450

1.使用注解

import org.springframework.beans.factory.annotation.Value;

import cn.hutool.core.io.IoUtil;

import org.springframework.core.io.Resource;

@Value("classpath:city.json")

Resource resource;

@PostConstruct

public void init() {

    // 转String

    String cityJson = IoUtil.readUtf8(resource.getInputStream());

    // 转List<String>

    List<String> list = IoUtil.readUtf8Lines(resource.getInputStream(), new ArrayList<>());

}

2.使用ResourceLoader接口

import org.springframework.core.io.Resource;

import org.springframework.core.io.ResourceLoader;

import org.springframework.stereotype.Component;

@Component

public class YourComponent {

    private final ResourceLoader resourceLoader;

    public YourComponent(ResourceLoader resourceLoader) {

        this.resourceLoader = resourceLoader;

    }

    public void getResource() throws IOException {

        Resource resource = resourceLoader.getResource("classpath:your-file.txt");

        InputStream inputStream = resource.getInputStream();

        // 对文件进行操作，比如读取内容等

    }

}

3.使用ClassPathResource类

import org.springframework.core.io.ClassPathResource;

public void getResource() throws IOException {

    ClassPathResource resource = new ClassPathResource("your-file.txt");

    InputStream inputStream = resource.getInputStream();

    // 对文件进行操作，比如读取内容等

}

4.使用ResourceUtils.getFile()方法

注意这种方式在jar包里无法使用

import org.springframework.util.ResourceUtils;

import cn.hutool.core.io.FileUtil;

public void getResource() throws IOException {

    File file = ResourceUtils.getFile("classpath:your-file.txt");

    // 对文件进行操作，比如读取内容等

    // 读取文件内容到集合

    List<String> list= FileUtil.readUtf8Lines(todayFile);

}