找了半天前端的问题,最后发现,原因是后端ResultHandler
的扫包问题
package com.example.demo.entity; import lombok.Data; /** * 统一返回的数据格式 * @author sxj * @param <T> */ @Data public class Result<T> { private Integer code; // 状态码 private String message; // 状态描述信息 private T data; // 定义为范型 }
package com.example.demo.aspect; import com.example.demo.entity.Result; import com.example.demo.exception.ErrorCode; import com.example.demo.util.ResultUtil; import com.fasterxml.jackson.core.JsonProcessingException; import com.fasterxml.jackson.databind.ObjectMapper; import org.springframework.core.MethodParameter; import org.springframework.http.MediaType; import org.springframework.http.server.ServerHttpRequest; import org.springframework.http.server.ServerHttpResponse; import org.springframework.lang.Nullable; import org.springframework.web.bind.annotation.*; import org.springframework.web.servlet.mvc.method.annotation.ResponseBodyAdvice; import java.lang.reflect.AnnotatedElement; import java.util.Arrays; /** * 按照统一格式返回值 * @author sxj */ @ControllerAdvice(basePackages = "com.example.demo.controller") public class ResultHandler implements ResponseBodyAdvice { private ThreadLocal<ObjectMapper> mapperThreadLocal = ThreadLocal.withInitial(ObjectMapper::new); private static final Class[] annos = { RequestMapping.class, GetMapping.class, PostMapping.class, DeleteMapping.class, PutMapping.class }; /** * 对所有RestController的接口方法进行拦截 */ @Override public boolean supports(MethodParameter returnType, Class converterType) { AnnotatedElement element = returnType.getAnnotatedElement(); return Arrays.stream(annos).anyMatch(anno -> anno.isAnnotation() && element.isAnnotationPresent(anno)); } @Override public Object beforeBodyWrite(@Nullable Object body, MethodParameter returnType, MediaType selectedContentType, Class selectedConverterType, ServerHttpRequest request, ServerHttpResponse response) { Object out; ObjectMapper mapper = mapperThreadLocal.get(); response.getHeaders().setContentType(MediaType.APPLICATION_JSON); if(body instanceof Result){ out = body; } else if (body instanceof ErrorCode){ ErrorCode errorCode = (ErrorCode) body; out = ResultUtil.error(errorCode.getCode(),errorCode.getMessage()); } else if (body instanceof String){ Result result = ResultUtil.success(body); try { //因为是String类型,我们要返回Json字符串,否则SpringBoot框架会转换出错 out = mapper.writeValueAsString(result); } catch (JsonProcessingException e) { out = ResultUtil.error(ErrorCode.JSON_PARSE_ERROR); } } else{ out = ResultUtil.success(body); } return out; } }
总结:每次使用别人的工程时,可以使用idea的
edit
-->find
-->replace in files
进行包名替换
使用自己的数据库时,改别人的xml还是要改很多的,一旦不小心就会报错,
例如:
在通用结果映射查询(BaseResultMap)里面明明将user_id映射成了userId
但是仍然错误的使用了user_id
<collection column="{userId = user_id}"/>
<resultMap id="UserVoResult" extends="BaseResultMap" type="com.example.demo.vo.UserVo"> <collection property="roles" column="{userId = userId}" ofType="com.example.demo.entity.Role" select="com.example.demo.mapper.RoleMapper.listByUserId"/> </resultMap>