创建项目
添加注解
数据验证失败处理
创建项目创建spring-boot项目，这里我网络不好，就创建普通maven项目，通过依赖手动完成spring-boot项目创建。
添加注解<parent>
<artifactId>spring-boot-starter-parent</artifactId>
<groupId>org.springframework.boot</groupId>
<version>2.7.2</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<version>2.7.2</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.24</version>
</dependency>
<!-- 数据验证的依赖 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-validation</artifactId>
</dependency>
</dependencies>
常用注解说明
@AssertFalse 校验false
@AssertTrue 校验true
@DecimalMax(value=,inclusive=) 小于等于value，inclusive=true,是小于等于
@DecimalMin(value=,inclusive=) 与上类似
@Max(value=) 小于等于value
@Min(value=) 大于等于value
@NotNull 检查Null
@Past 检查日期
@Pattern(regex=,flag=) 正则
@Size(min=, max=) 字符串，集合，map限制大小
@Validate 对po实体类进行校验
创建实体类
package com.hopeful.pojo;
import lombok.Data;
import javax.validation.constraints.Min;
import javax.validation.constraints.NotNull;
import javax.validation.constraints.Size;
import java.io.Serializable;
@Data
public class User implements Serializable {
private Integer id;
@NotNull(message = "姓名不能为空")
private String name;
@NotNull
@Size(min = 6,message = "密码不能没空，且不能少于6位")
private String pwd;
}
创建controller
package com.hopeful;
import com.hopeful.pojo.User;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.*;
@RequestMapping("/user")
@RestController
public class controller {
@RequestMapping("/hello")
public String hello() {
return "hello";
}
@PostMapping("/insertUser")
public String insert2(@Validated @RequestBody User user) {
System.out.println(user);
return "新增成功";
}
}
数据验证失败，会报错，需要处理
数据验证失败处理方法一：controller处理
package com.hopeful;
import com.hopeful.pojo.User;
import org.springframework.validation.BindingResult;
import org.springframework.validation.FieldError;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.*;
import java.util.List;
@RequestMapping("/user")
@RestController
public class controller {
@RequestMapping("/hello")
public String hello() {
return "hello";
}
@GetMapping("/insertUser")
public User insert(@Validated User user) {
return user;
}
@PostMapping("/insertUser")
public String insert2(@Validated @RequestBody User user, BindingResult bindingResult) {
if(bindingResult.hasErrors()) {
String msg = "";
msg = getString(bindingResult, msg);
return msg;
}
System.out.println(user);
return "新增成功";
}
public static String getString(BindingResult bindingResult, String msg) {
List<FieldError> fieldErrors = bindingResult.getFieldErrors();
int size = fieldErrors.size();
for (int i = 0; i < size; i++) {
FieldError fieldError = fieldErrors.get(i);
if(fieldError != null) {
msg += fieldError.getDefaultMessage();
}
if(i < size - 1) {
msg += ";";
}
}
return msg;
}
}
方法二：全局异常处理
我们建议使用全局异常处理。
创建全局异常处理
package com.hopeful.pojo.common;
import org.springframework.validation.BindException;
import org.springframework.validation.BindingResult;
import org.springframework.validation.FieldError;
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 org.springframework.web.bind.annotation.RestController;
import javax.validation.ConstraintViolationException;
import javax.validation.ValidationException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
@ControllerAdvice
@ResponseBody
public class globalException extends RuntimeException {
@ExceptionHandler(value = {BindException.class, ValidationException.class,MethodArgumentNotValidException.class})
public String MethodArgumentNotValidException(Exception e) {
String msg = "";
if (e instanceof MethodArgumentNotValidException) {
BindingResult bindingResult = ((MethodArgumentNotValidException) e).getBindingResult();
// getFieldError获取的是第一个不合法的参数(P.S.如果有多个参数不合法的话)
//FieldError fieldError = bindingResult.getFieldError();
//if (fieldError != null) {
// msg = fieldError.getDefaultMessage();
//}
List<FieldError> fieldErrors = bindingResult.getFieldErrors();
int size = fieldErrors.size();
for (int i = 0; i < size; i++) {
FieldError fieldError = fieldErrors.get(i);
if(fieldError != null) {
msg += fieldError.getDefaultMessage();
}
if(i < size - 1) {
msg += ";";
}
}
} else if (e instanceof BindException) {
// getFieldError获取的是第一个不合法的参数(P.S.如果有多个参数不合法的话)
FieldError fieldError = ((BindException) e).getFieldError();
if (fieldError != null) {
msg = fieldError.getDefaultMessage();
}
} else if (e instanceof ConstraintViolationException) {
/*
* ConstraintViolationException的e.getMessage()形如
* {方法名}.{参数名}: {message}
* 这里只需要取后面的message即可
*/
msg = e.getMessage();
if (msg != null) {
int lastIndex = msg.lastIndexOf(':');
if (lastIndex >= 0) {
msg = msg.substring(lastIndex + 1).trim();
}
}
/// ValidationException 的其它子类异常
} else {
msg = "处理参数时异常";
}
return msg;
}
}
##测试
结果如下：
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