多个Bean自动注入成Map @Autowired @Service 策略模式

文章目录

    • 需求
    • 准备
    • 源代码
    • 测试结果
    • 策略模式实现
      • 需求
      • 准备
      • 使用
    • 参考

需求

  • 将多个策略的具体实现自动注入到Map中

准备

  • 一个接口,有doSomething()方法
  • 多个具体实现策略,实现doSomething()方法
  • 一个Controller,用于测试自动注入

源代码

public interface DemoInterface
{
    void doSomething();
}
@Service
public class DemoService implements DemoInterface
{
    public void doSomething()
    {
        System.out.println("call me");
    }
}
@Service("my-own-name-2")
public class DemoService2 implements DemoInterface
{
    public void doSomething()
    {
        System.out.println("2 call me");
    }
}
@Component
public class DemoService3 implements DemoInterface
{
    public void doSomething()
    {
        System.out.println("3 call me");
    }
}
@RestController
public class DemoController
{
    @Autowired
    private Map<String,DemoInterface> demoServiceMap;

    @GetMapping("/test")
    public String test(){
        for(Map.Entry<String, DemoInterface> entry : demoServiceMap.entrySet()){
            System.out.println(entry.getKey());
            System.out.println(entry.getValue());
        }
        return "succ";
    }
}

测试结果

demoService
com.example.testtwo.DemoService@75d2647f
my-own-name-2
com.example.testtwo.DemoService2@1a5055cf
demoService3
com.example.testtwo.DemoService3@fe6916c

策略模式实现

需求

文件上传功能,可以使用oss和minio两种方式

准备

  • 策略接口,包含uploadFile()方法
public interface UploadStrategy {
    String uploadFile(MultipartFile file, String path);
    String uploadFile(String fileName, InputStream inputStream, String path);
}
  • 抽象实现,抽象出一些公共逻辑,留出不同策略区别的方法进一步具体实现(非必要)
public abstract class AbstractUploadStrategyImpl implements UploadStrategy{
    @Override
    public String uploadFile(MultipartFile file, String path) {
        try {
            String md5 = FileUtil.getMd5(file.getInputStream());
            String extName = FileUtil.getExtName(file.getOriginalFilename());
            String fileName = md5 + extName;
            if (!exists(path + fileName)) {
                upload(path, fileName, file.getInputStream());
            }
            return getFileAccessUrl(path + fileName);
        } catch (Exception e) {
            e.printStackTrace();
            throw new BizException("文件上传失败");
        }
    }
    @Override
    public String uploadFile(String fileName, InputStream inputStream, String path) {
        try {
            upload(path, fileName, inputStream); // 具体上传策略
            return getFileAccessUrl(path + fileName); // 具体文件路径
        } catch (Exception e) {
            e.printStackTrace();
            throw new BizException("文件上传失败");
        }
    }
    public abstract Boolean exists(String filePath);

    public abstract void upload(String path, String fileName, InputStream inputStream) throws IOException;

    public abstract String getFileAccessUrl(String filePath);
}
  • 具体实现

    • Oss
    @Service("ossUploadStrategyImpl")
    public class OssUploadStrategyImpl extends AbstractUploadStrategyImpl {
    
        @Autowired
        private OssConfigProperties ossConfigProperties;
    
        @Override
        public Boolean exists(String filePath) {
            return getOssClient().doesObjectExist(ossConfigProperties.getBucketName(), filePath);
        }
    
        @Override
        public void upload(String path, String fileName, InputStream inputStream) {
            getOssClient().putObject(ossConfigProperties.getBucketName(), path + fileName, inputStream);
        }
    
        @Override
        public String getFileAccessUrl(String filePath) {
            return ossConfigProperties.getUrl() + filePath;
        }
    
        private OSS getOssClient() {
            return new OSSClientBuilder().build(ossConfigProperties.getEndpoint(), ossConfigProperties.getAccessKeyId(), ossConfigProperties.getAccessKeySecret());
        }
    
    }
    
    • Minio
    @Service("minioUploadStrategyImpl")
    public class MinioUploadStrategyImpl extends AbstractUploadStrategyImpl {
    
        @Autowired
        private MinioProperties minioProperties;
    
        @Override
        public Boolean exists(String filePath) {
            boolean exist = true;
            try {
                getMinioClient()
                        .statObject(StatObjectArgs.builder().bucket(minioProperties.getBucketName()).object(filePath).build());
            } catch (Exception e) {
                exist = false;
            }
            return exist;
        }
    
        @SneakyThrows
        @Override
        public void upload(String path, String fileName, InputStream inputStream) {
            getMinioClient().putObject(
                    PutObjectArgs.builder().bucket(minioProperties.getBucketName()).object(path + fileName).stream(
                                    inputStream, inputStream.available(), -1)
                            .build());
        }
    
        @Override
        public String getFileAccessUrl(String filePath) {
            return minioProperties.getUrl() + filePath;
        }
    
        private MinioClient getMinioClient() {
            return MinioClient.builder()
                    .endpoint(minioProperties.getEndpoint())
                    .credentials(minioProperties.getAccessKey(), minioProperties.getSecretKey())
                    .build();
        }
    
    }
    
  • 枚举

    // 把复杂的方法名与实际技术名词对应
    public enum UploadModeEnum {
    
        OSS("oss", "ossUploadStrategyImpl"),
    
        MINIO("minio", "minioUploadStrategyImpl");
    
        private final String mode;
    
        private final String strategy;
    
        public static String getStrategy(String mode) {
            for (UploadModeEnum value : UploadModeEnum.values()) {
                if (value.getMode().equals(mode)) {
                    return value.getStrategy();
                }
            }
            return null;
        }
    
    }
    

使用

@Autowired
private Map<String, UploadStrategy> uploadStrategyMap; // 自动注入UploadStrategy接口的实现类

uploadStrategyMap.get(getStrategy("oss")).uploadFile(file, path); // 先根据技术名词获得策略具体实现方法名,再从map中拿到对象,调用对象方法

参考

源码:https://github.com/linhaojun857/aurora

原理:https://www.cnblogs.com/lifullmoon/p/14453011.html

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