springboot 读取配置信息和对应bean

读取application.yml 配置信息

读取顺序 网上太多了，就复制过来了

这里说了四种方式可以把配置文件放到外部的。
第一种是在jar包的同一目录下建一个config文件夹，然后把配置文件放到这个文件夹下；
第二种是直接把配置文件放到jar包的同级目录；
第三种在classpath下建一个config文件夹，然后把配置文件放进去；
第四种是在classpath下直接放配置文件。
这四种方式的优先级是从一到四一次降低的。

person:
  person-name: 张三
  person-age: 10

//读取application.yml配置信息
@Component
@ConfigurationProperties(prefix = "person")
public class TestConfig2 {
    @Value("${person.person-name}")
    private String name;
    @Value("${person.person-age}")
    private String age;

    @Override
    public String toString() {
        return "TestConfig2{" +
                "name='" + name + '\'' +
                ", age='" + age + '\'' +
                '}';
    }
}

读取resources下面的配置信息 例如下面有一个config.yml

username: zhangsan
pwd: 123456
name: 张三

//读取classpath配置信息
@Component
@PropertySource(value = {"classpath:config.yml"},encoding = "utf-8")
public class TestConfig {
    @Value("${username}")
    private String username;
    @Value("${pwd}")
    private String pwd;
    @Value("${name}")
    private String name;

    @Override
    public String toString() {
        return "TestConfig{" +
                "username='" + username + '\'' +
                ", pwd='" + pwd + '\'' +
                ", name='" + name + '\'' +
                '}';
    }
}

读取外部指定位置的配置信息

username2: file:E:/study/java/config/other.yml
pwd: 1234569
name: 张三d

//读取指定位置配置信息
@Component
//@PropertySource(value ={"file:${user.dir}/config/custom.properties","file:${user.dir}/config/custom_prison.properties"}, ignoreResourceNotFound = true)
@PropertySource(value ={"file:E:/study/java/config/other.yml"}, ignoreResourceNotFound = true,encoding = "utf-8")
public class TestConfig3 {
    @Value("${username2}")
    private String username;
    @Value("${pwd}")
    private String pwd;
    @Value("${name}")
    private String name;

    @Override
    public String toString() {
        return "TestConfig3{" +
                "username='" + username + '\'' +
                ", pwd='" + pwd + '\'' +
                ", name='" + name + '\'' +
                '}';
    }
}

上传图片到指定目录和浏览图片

1. 创建配置文件config.yml

staticAccessPath: /api/file/**
uploadFolder: E:/study/java/uploadFiles/
min: 1
max: 5

2. 创建配置Bean

@Data
@Component
@PropertySource(value = {"classpath:config.yml"},encoding = "utf-8")
public class FileConfig {
    @Value("${staticAccessPath}")
    private String staticAccessPath;
    @Value("${uploadFolder}")
    private String uploadFolder;
    @Value("${min}")
    private int min;
    @Value("${max}")
    private int max;

    @Override
    public String toString() {
        return "FileConfig{" +
                "staticAccessPath='" + staticAccessPath + '\'' +
                ", uploadFolder='" + uploadFolder + '\'' +
                ", min='" + min + '\'' +
                ", max='" + max + '\'' +
                '}';
    }
}

3. 创建Config

@Configuration
public class UploadFileConfig {

    @Autowired
    FileConfig config;

    @Bean
    MultipartConfigElement multipartConfigElement() {
        MultipartConfigFactory factory = new MultipartConfigFactory();
        factory.setLocation(config.getUploadFolder());
        //文件最大
        factory.setMaxFileSize(DataSize.ofMegabytes(config.getMin()));
        // 设置总上传数据总大小
        factory.setMaxRequestSize(DataSize.ofMegabytes(config.getMin()));
        return factory.createMultipartConfig();
    }
}

4. 配置WebMvcConfg

//http://127.0.0.1:8089/ityustudy/api/file/html169ecca9-375c-471b-abdf-72531f674d8b.jpg 浏览图片
   public  void addResourceHandlers(ResourceHandlerRegistry registry){
       registry.addResourceHandler(fileConfig.getStaticAccessPath()).addResourceLocations("file:" + fileConfig.getUploadFolder());
    }

5.上传文件

 @ApiOperation(value = "上传多张图片")
    @PostMapping("/uploadImgs")
    @ResponseBody
    public R<List<String>> uploadImgs(MultipartFile[] file) {
        if (file==null||file.length == 0) {
            return RUtil.error(0, "请上传图片");
        }
        List<String> array = new ArrayList();
        // 要上传的目标文件存放路径
        for (MultipartFile f : file) {
            String originalFilename = getSuffix(f.getOriginalFilename());
            String s = "html"+ UUID.randomUUID() + originalFilename;
            if (Utils.upload(f, fileConfig.getUploadFolder(), s)) {
                array.add(Utils.getUrl(fileConfig.getStaticAccessPath().replace("**","") + s, 0));
            } else {
                return RUtil.error(0, "上传失败");
            }
        }
        return RUtil.ok(array);
    }

6. 浏览图片
   http://127.0.0.1:8089/ityustudy/api/file/html169ecca9-375c-471b-abdf-72531f674d8b.jpg 浏览图片