从controller到数据的获取

最新推荐文章于 2022-01-23 15:27:36 发布

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最新推荐文章于 2022-01-23 15:27:36 发布

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分类专栏： Java基础

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本文详细阐述了从Controller层如何调用Service层，再由Service层操作DAO层，最终获取并返回所需数据的整个过程，同时提及了状态码在其中的作用。

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controller中的代码

@Controller
@RequestMapping("/brand")
public class PmsBrandController {
	@Autowired
	private PmsBrandService demoService;
	
	@RequestMapping(value="/create",method=RequestMethod.POST)
	@ResponseBody
	public CommonResult createBrand(@RequestBody PmsBrand pmsBrand) {
		CommonResult commonResult;
		int count = demoService.createBrand(pmsBrand);
		if(count == 1) {
			commonResult = CommonResult.success(pmsBrand);
		}else{
			commonResult = CommonResult.failed("操作失败");
		}
		return commonResult;
	}
}

service层

@Service
public class PmsBrandService {
	@Autowired
	private PmsBrandMapper brandMapper;
	
	public int createBrand(PmsBrand brand){
		return brandMapper.insertSelective(brand);
	}
}

dao层

public interface PmsBrandMapper{
		int insertSelective(PmsBrand record);
}

要返回的数据

/**
 *通用返回对象
 */
 @Setter
 @Getter
public class CommonResult<T>{
	private long code;
	private String message;
	private T data;
	
	protected CommonResult() {
	}
	protected CommonResult(long code,String message,T data){
		this.code = code;
		this.message = message;
		this.data = data;
	}
	//返回成功结果 
	public static <T> CommonResult<T> success(T data){
		return new CommonResult<T>(ResultCode.SUCCESS.getCode(),ResultCode.SUCCESS.getMethod,data);
	}
	
	//成功返回结果
	public static <T> CommonResult<T> success(T data,String message){
		return new CommonResult<T>(ResultCode.SUCCESS.getCode(),message,data);
	}
	//返回失败结果
	public static <T> CommonResult<T> failed(String message){
		return new CommonResult<T>(ResultCode.FAILED.getCode(),message,null);
	}
	.......
}

状态码

public enum ResultCode{
	SUCCESS(200,"操作成功"),
	FAILE(500,"操作失败");
	private long code;
	private String message;
	private ResultCode(long code,String message) {
		this.code = code;
		this.message = message;
	}
	public long getCode(){
		return code;
	}
	public String getMessage(){
		return message;
	}
}