若依学习笔记1-validated

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
               <!-- 保证 Spring AOP 相关的依赖包 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-aop</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-validation</artifactId>
        </dependency>

异常配置 统一拦截

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.validation.ObjectError;
import org.springframework.web.bind.MethodArgumentNotValidException;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseBody;

import javax.servlet.http.HttpServletRequest;

@ControllerAdvice(basePackages = "com.gouying.demos.web")
public class GlobalExceptionHandler {

    private Logger logger = LoggerFactory.getLogger(getClass());



    /**
     * 处理 MissingServletRequestParameterException 异常
     *
     * SpringMVC 参数不正确
     */
    @ResponseBody
    @ExceptionHandler(value = MethodArgumentNotValidException.class)
    public Object missingServletRequestParameterExceptionHandler(HttpServletRequest req, MethodArgumentNotValidException ex) {
        logger.debug("[missingServletRequestParameterExceptionHandler]", ex);


        StringBuilder detailMessage = new StringBuilder();
        for (ObjectError objectError : ex.getAllErrors()) {
            // 使用 ; 分隔多个错误
            if (detailMessage.length() > 0) {
                detailMessage.append(";");
            }
            // 拼接内容到其中
            detailMessage.append(objectError.getDefaultMessage());
        }
        System.out.println(detailMessage);
        // 包装 CommonResult 结果
        return detailMessage;
    }

}

这个类可以处理返回值

• 不是Result类的返回Result

• 想要更改数据这里也可以

  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.web.bind.annotation.ControllerAdvice;
  import org.springframework.web.servlet.mvc.method.annotation.ResponseBodyAdvice;

  // 只拦截我们的 Controller 所在包，避免其它类似 swagger 提供的 API 被切面拦截
  @ControllerAdvice(basePackages = "com.gouying.demos.web")
  public class GlobalResponseBodyHandler implements ResponseBodyAdvice {

    @Override
    public boolean supports(MethodParameter returnType, Class converterType) {
        return true;
    }
  
    @Override
    public Object beforeBodyWrite(Object body, MethodParameter returnType, MediaType selectedContentType, Class selectedConverterType,
                                  ServerHttpRequest request, ServerHttpResponse response) {
        // 如果已经是 CommonResult 类型，则直接返回
        System.out.println(String.valueOf(body));
        // 如果不是，则包装成 CommonResult 类型
        return "success";
    }

  }

controller

@Validated
@Controller
public class BasicController {

    // curl -H "Content-Type: application/json" -X POST -d '{"name":"123"}' "http://127.0.0.1:8888/hello"
    @PostMapping("/hello")
    @ResponseBody
    public String hello(@Valid @RequestBody  User user) {
        return user.getName();
    }

}