SpringMVC 1.请求参数检查 2.全局异常处理 3.请求参数封装为Pojo

ErrorEnum.java // 枚举所有的错误

package com.example.demo.enums;import lombok.Getter;public enum ErrorEnum {SYSTEM_ERROR(-1, "系统错误"),PARAM_ERROR(-2, "参数错误"),OK(0, "成功"),;@Getterprivate final int code;@Getterprivate final String errorMsg;ErrorEnum(int code, String errorMsg) {this.code = code;this.errorMsg = errorMsg;}
}

LogicException.java // 逻辑异常封装

package com.example.demo.core;import com.example.demo.enums.ErrorEnum;
import lombok.Getter;public class LogicException extends RuntimeException {@Getterprivate final ErrorEnum errorEnum;public LogicException(ErrorEnum errorEnum) {super(String.format("errorCode=%d,errorMsg=%s", errorEnum.getCode(), errorEnum.getErrorMsg()));this.errorEnum = errorEnum;}
}

ResponseEntity.java // 返回值封装

package com.example.demo.core;import com.example.demo.enums.ErrorEnum;
import lombok.AllArgsConstructor;
import lombok.Data;@AllArgsConstructor
@Data  // 注意这个!!!
public class ResponseEntity<T> {private final int code;private final T data;private final String errorMsg;public static <T> ResponseEntity<T> success(T data) {return new ResponseEntity<>(ErrorEnum.OK.getCode(), data, ErrorEnum.OK.getErrorMsg());}public static ResponseEntity<Void> exception(ErrorEnum errorEnum) {return new ResponseEntity<>(errorEnum.getCode(), null, errorEnum.getErrorMsg());}
}

IReuqest.java // 用于检查接口

package com.example.demo.core;public interface IRequest {/*** 进行参数错误检检查*/void checkParamError();
}

GlobalExceptionCatch.java // 全局异常捕获

package com.example.demo.core;import com.example.demo.enums.ErrorEnum;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RestControllerAdvice;@Slf4j
@RestControllerAdvice
public class GlobalExceptionCatch {@ExceptionHandler(Throwable.class)public ResponseEntity<Void> exceptionHandler(Throwable e) {log.error("globalException=", e);// 默认是系统错误ErrorEnum errorEnum = ErrorEnum.SYSTEM_ERROR;// 逻辑错误if (e instanceof LogicException) {LogicException logicException = (LogicException) e;errorEnum = logicException.getErrorEnum();}return ResponseEntity.exception(errorEnum);}
}

AccountController.java

package com.example.demo.controller;import com.example.demo.core.LogicException;
import com.example.demo.core.ResponseEntity;
import com.example.demo.msg.RegisterRequest;
import com.example.demo.msg.RegisterResponse;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;@RestController
@RequestMapping("/account")
public class AccountController {/*** 情况1:* http://localhost:8080/account/register?username="xx"&password="123"* 返回:* {"code":0,"data":{"username":"a1","password":"1231"},"errorMsg":"成功"}* 情况2:* http://localhost:8080/account/register* 返回:{"code":-2,"data":null,"errorMsg":"参数错误"}* 同时打印了错误** @param request* @return*/@RequestMapping("/register")public ResponseEntity<RegisterResponse> register(RegisterRequest request) throws LogicException {request.checkParamError();// 返回RegisterResponse response = new RegisterResponse();response.setUsername(request.getUsername());response.setPassword(request.getPassword());return ResponseEntity.success(response);}
}

RegisterRequest.java

package com.example.demo.msg;import com.example.demo.core.IRequest;
import com.example.demo.enums.ErrorEnum;
import com.example.demo.core.LogicException;
import lombok.Data;
import org.springframework.util.StringUtils;@Data
public class RegisterRequest implements IRequest {private String username;private String password;@Overridepublic void checkParamError() {if (StringUtils.isEmpty(username) || StringUtils.isEmpty(password)) {throw new LogicException(ErrorEnum.PARAM_ERROR);}}
}

RegisterResponse.java

package com.example.demo.msg;import lombok.Data;@Data
public class RegisterResponse {private String username;private String password;
}