1、策略模式公共接口类 

BankFileStrategy

public interface BankFileStrategy {


    
    String getBankFile(String bankType) throws Exception;
}

2、策略模式业务实现类

@Slf4j
@Component
public class ConcreteStrategy implements BankFileStrategy {

   
    @Override
    public String getBankFile(String bankType) throws Exception {
    ....业务代码
    }

3、策略模式实现类枚举

public enum BankTypeClassEnum {
    //
    strategyA("ICBC", "concreteStrategy"),
    ;
    private String name;
    private String implName;

    public static String getImplName(String name) {
        if (StringUtils.isBlank(name)) {
            return null;
        }

        for (BankTypeClassEnum aEnum : BankTypeClassEnum.values()) {
            if (aEnum.getName().equals(name)) {
                return aEnum.getImplName();
            }
        }
        return null;
    }

    BankTypeClassEnum(String name, String implName) {
        this.name = name;
        this.implName = implName;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getImplName() {
        return implName;
    }

    public void setImplName(String implName) {
        this.implName = implName;
    }
}

4、策略模式执行类

@Slf4j
@Component
public class BankFileContext {
    //当一个接口有多个实现类时，Spring会自动将Strategy接口的实现类注入到这个Map中，key为bean id，value值则为对应的策略实现类
    @Autowired
    private Map<String, BankFileStrategy> bankFileStrategyMap;

    /**
     * 执行类
     */
    public String execute(String bankType) throws Exception {
        BankFileStrategy service = bankFileStrategyMap.get(BankTypeClassEnum.getImplName(bankType));
        return service.getBankFile(bankType);
    }
}

5、测试策略模式

@Slf4j
@RestController
@RequiredArgsConstructor(onConstructor = @__(@Autowired))
public class TestBankFileController {

    private final BankFileContext bankFileContext;


	 
    @GetMapping(value = "/bank/{bankType}/file")
    public String testBankFile(@PathVariable String bankType) {
        try {
            
            return bankFileContext.execute(bankType);
        } catch (Exception e) {
            log.error("testBankFile is error", e);
            return "error";
        }

    }
}