使用@RequestBody配合@Valid校验入参参数

import com.example.demo.pojo.User;

import org.springframework.web.bind.annotation.PostMapping;

import org.springframework.web.bind.annotation.RequestBody;

import org.springframework.web.bind.annotation.RestController; 

import javax.validation.Valid;

/**

  * @Author: luoye

  * @Date: 2018-10-12

  */

@RestController

public class ValiController {

    @PostMapping (value = "/" ,produces = "application/json;charset=UTF-8" )

    public User vali( @RequestBody @Valid User user){

        return user;

    }

}

import javax.validation.constraints.Max;

import javax.validation.constraints.NotBlank;

import javax.validation.constraints.NotNull;

/**

  * @Author: luoye

  * @Date: 2018-10-12

  */

public class User {

    @NotBlank (message = "这个姓名不能为空" )

    private String name;

    @NotNull (message = "这个年龄不能为空" )

    @Max (value = 105 ,message = "太大了" )

    private Integer age;

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this .name = name;

    }

    public Integer getAge() {

        return age;

    }

    public void setAge(Integer age) {

        this .age = age;

    }

}

import com.example.demo.pojo.ErrorMsg;

import org.springframework.validation.BindingResult;

import org.springframework.validation.FieldError;

import org.springframework.validation.ObjectError;

import org.springframework.web.bind.MethodArgumentNotValidException;

import org.springframework.web.bind.annotation.ExceptionHandler;

import org.springframework.web.bind.annotation.ControllerAdvice;

import org.springframework.web.bind.annotation.ResponseBody;

import java.util.ArrayList;

import java.util.List;

/**

  * @Author luoye

  * @Date: 2018/10/12 16:50

  */

@ControllerAdvice

public class ExceptionHandlerContrller { 

    @ExceptionHandler (MethodArgumentNotValidException. class )

    @ResponseBody

    public List<ErrorMsg> exception(MethodArgumentNotValidException e) {

        BindingResult bindingResult = e.getBindingResult();

        List<ObjectError> allErrors = bindingResult.getAllErrors();

        List<ErrorMsg> errorMsgs = new ArrayList<>();

        allErrors.forEach(objectError -> {

            ErrorMsg errorMsg = new ErrorMsg();

            FieldError fieldError = (FieldError)objectError;

            errorMsg.setField(fieldError.getField());

            errorMsg.setObjectName(fieldError.getObjectName());

            errorMsg.setMessage(fieldError.getDefaultMessage());

            errorMsgs.add(errorMsg);

        });

        return errorMsgs;

    }

}

[

    {

        "field" : "name" ,

        "message" : "这个姓名不能为空" ,

        "objectName" : "user"

    },

    {

        "field" : "age" ,

        "message" : "这个年龄不能为空" ,

        "objectName" : "user"

    }

]

public String getResponse( @RequestBody @Valid MyRequest request) throws Exception {

     xxx

}

@Data

public class MyRequest {

     @NotNull (message = "id 不能为空" )

     private Integer id;

     @NotNull (message = "name 不能为空" )

     private String name;

}

@ControllerAdvice

@Slf4j

public class ExceptionResolver {

     @ExceptionHandler (value = {Exception. class })

     @ResponseBody

     public String handleOtherExceptions( final Exception ex) {

         if (ex instanceof MethodArgumentNotValidException) {

             // 入参校验错误

             StringBuilder msg = new StringBuilder();

             MethodArgumentNotValidException mex = (MethodArgumentNotValidException) ex;

             BindingResult bindingResult = mex.getBindingResult();

             List<ObjectError> allErrors = bindingResult.getAllErrors();

             allErrors.forEach(objectError -> {

                 FieldError fieldError = (FieldError) objectError;

                 String oneMsg = fieldError.getDefaultMessage();

                 msg.append(oneMsg);

                 msg.append( ";" );

             });

             return msg.toString();

         }

     }

}