Java策略模式基本使用

前言一、使用步骤

1.定义出参结果类2.定义接口类3.规则统一处理逻辑类4.接口响应结果处理器类5.业务处理类（随业务扩展）

5.15.2 6.控制层 二.测试结果

1.参数为空2.业务处理1类3.业务处理2类4.输入不存在的接口 三.代码结构总结

优点：可基于批量if else场景下优化代码；扩展性高
缺点：不兼容swagger在线接口文档

@Data
public class SendResult {

    public SendResult(Boolean result, String message) {
        this.result = result;
        this.message = message;
    }

    private Boolean result;
    private String message;
}

public interface OpenApi {

    
    boolean support(String uri);

    
    SendResult handle(String uri, Object[] result);
}

public abstract class AbstractOpenApi implements OpenApi {

    
    @Override
    public SendResult handle(String uri, Object[] result) {
        return getResult(uri, result);
    }

    
    public abstract SendResult getResult(String uri, Object[] result);
}

@Slf4j
@Component(value = "OpenApiManger")
public class OpenApiManger implements OpenApi {


    @Resource
    private List abstractWs;

    
    @Override
    public boolean support(String uri) {
        //默认不支持
        return false;
    }

    
    @Override
    public SendResult handle(String uri, Object[] result) {

        getParam(uri, result);
        //校验uri是否合法
        for (AbstractOpenApi ws : abstractWs) {
            if (ws.support(uri)) {
                long s = System.currentTimeMillis();
                SendResult body = ws.handle(uri, result);
                long e = System.currentTimeMillis();
                log.info("完成请求--->uri[{}],请求内容[{}],请求耗时:{}ms", uri, result, (e - s));
                return body;
            }
        }
        return new SendResult(false, "不支持该接口");
    }


    
    public void getParam(String uri, Object[] result) {

        if (uri == null || result == null) {
            throw new ParamException("参数不能为空");
        }
    }
}

@Service
@Slf4j
public class ResultApi1 extends AbstractOpenApi {

    
    
    private final static String URI = "api1";

    
    @Override
    public SendResult getResult(String uri, Object[] result) {

        log.info("业务处理1类");
        
        JSonObject jsonObject = (JSONObject) JSONObject.parse(result[0].toString());

        return new SendResult(jsonObject.getBoolean("Statue"),
                jsonObject.getString("Messages"));
    }

    
    @Override
    public boolean support(String uri) {
        return URI.equals(uri);
    }
}

@Service
@Slf4j
public class ResultApi2 extends AbstractOpenApi {

    
    
    private final static String URI = "api2";

    
    @Override
    public SendResult getResult(String uri, Object[] result) {

        log.info("业务处理2类");
        
        JSonObject jsonObject = (JSONObject) JSONObject.parse(result[0].toString());

        return new SendResult(jsonObject.getBoolean("Statue"),
                jsonObject.getString("Messages"));
    }

    
    @Override
    public boolean support(String uri) {
        return URI.equals(uri);
    }
}

@RestController
public class TestController {

    @Resource
    private OpenApiManger openApiManger;

    @GetMapping("test")
    public SendResult test(String uri) {

        String message = "{"Statue":false,"Messages":"解析失败！"}";
        Object[] result = new String[]{message};
        return openApiManger.handle(uri, result);
    }
}

完结