前言
相关jar依赖引入
<!-- Spring Boot 启动父依赖 -->
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.6.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<!-- Spring Boot Web 依赖 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
</dependencies>
全局异常控制器
package com.yb.demo.common.handler;
import com.yb.demo.common.enums.CodeEnum;
import com.yb.demo.common.exception.BizException;
import com.yb.demo.pojo.response.Result;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.springframework.validation.BindException;
import org.springframework.web.HttpRequestMethodNotSupportedException;
import org.springframework.web.bind.MethodArgumentNotValidException;
import org.springframework.web.bind.MissingServletRequestParameterException;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RestControllerAdvice;
import javax.validation.ValidationException;
import java.util.StringJoiner;
/**
* 全局异常处理
* <p>
* 规范：流程跳转尽量避免使用抛 BizException 来做控制。
*
* @author daoshenzzg@163.com
* @date 2019-09-06 18:02
*/
@Slf4j
@RestControllerAdvice
public class GlobalExceptionHandler {
/**
* 处理自定义异常
*
* @param ex
* @return
*/
@ExceptionHandler(BizException.class)
public Result handleBizException(BizException ex) {
Result result = Result.renderErr(ex.getCode());
if (StringUtils.isNotBlank(ex.getRemark())) {
result.withRemark(ex.getRemark());
}
return result;
}
/**
* 参数绑定错误
*
* @param ex
* @return
*/
@ExceptionHandler(BindException.class)
public Result handleBindException(BindException ex) {
StringJoiner sj = new StringJoiner(";");
ex.getBindingResult().getFieldErrors().forEach(x -> sj.add(x.getDefaultMessage()));
return Result.renderErr(CodeEnum.REQUEST_ERR).withRemark(sj.toString());
}
/**
* 参数校验错误
*
* @param ex
* @return
*/
@ExceptionHandler(ValidationException.class)
public Result handleValidationException(ValidationException ex) {
return Result.renderErr(CodeEnum.REQUEST_ERR).withRemark(ex.getCause().getMessage());
}
/**
* 字段校验不通过异常
*
* @param ex
* @return
*/
@ExceptionHandler(MethodArgumentNotValidException.class)
public Result handleMethodArgumentNotValidException(MethodArgumentNotValidException ex) {
StringJoiner sj = new StringJoiner(";");
ex.getBindingResult().getFieldErrors().forEach(x -> sj.add(x.getDefaultMessage()));
return Result.renderErr(CodeEnum.REQUEST_ERR).withRemark(sj.toString());
}
/**
* Controller参数绑定错误
*
* @param ex
* @return
*/
@ExceptionHandler(MissingServletRequestParameterException.class)
public Result handleMissingServletRequestParameterException(MissingServletRequestParameterException ex) {
return Result.renderErr(CodeEnum.REQUEST_ERR).withRemark(ex.getMessage());
}
/**
* 处理方法不支持异常
*
* @param ex
* @return
*/
@ExceptionHandler(value = HttpRequestMethodNotSupportedException.class)
public Result handleHttpRequestMethodNotSupportedException(HttpRequestMethodNotSupportedException ex) {
return Result.renderErr(CodeEnum.METHOD_NOT_ALLOWED);
}
/**
* 其他未知异常
*
* @param ex
* @return
*/
@ExceptionHandler(value = Exception.class)
public Result handleException(Exception ex) {
log.error(ex.getMessage(), ex);
return Result.renderErr(CodeEnum.SERVER_ERR);
}
}
个性化异常处理
自定义异常
/**
* 业务异常跳转。
*
* @author daoshenzzg@163.com
* @date 2019-09-09 14:57
*/
@Data
public class BizException extends RuntimeException {
private static final long serialVersionUID = 1L;
private CodeEnum code;
private String remark;
public BizException(CodeEnum code) {
super(code.getMessage());
this.code = code;
}
public BizException withRemark(String remark) {
this.remark = remark;
return this;
}
}
/**
* 添加学生
*
* @param student
* @return
*/
public Student1DO addStudent(Student1DO student) {
if (StringUtils.isNotBlank(student.getStudName())) {
// 举例扔个业务异常，实际使用过程中，应该避免扔异常
throw new BizException(CodeEnum.REQUEST_ERR).withRemark("studName不能为空");
}
student1Mapper.insert(student);
return student;
}
{
"code": -400,
"msg": "请求错误(studName不能为空)",
"data": {},
"ttl": 0
}
使用 Spring validation 完成数据后端校验
package com.yb.demo.pojo.model.db1;
import com.baomidou.mybatisplus.annotation.FieldFill;
import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableName;
import lombok.Data;
import javax.validation.constraints.Min;
import javax.validation.constraints.Size;
/**
* @author daoshenzzg@163.com
* @date 2019-08-05 17:58
*/
@Data
@TableName("student")
public class Student1DO {
private Long id;
@Size(max = 8, message = "studName长度不能超过8")
private String studName;
@Min(value = 12, message = "年龄不能低于12岁")
private Integer studAge;
private String studSex;
@TableField(fill = FieldFill.INSERT)
private Integer createTime;
@TableField(fill = FieldFill.INSERT_UPDATE)
private Integer updateTime;
}
@PostMapping("/student/add")
public Result addStudent(@Validated @RequestBody Student1DO student) {
student = studentService.addStudent(student);
return Result.renderOk(student);
}
{
"code": -400,
"msg": "请求错误(年龄不能低于12岁)",
"data": {},
"ttl": 0
}
结束语
具体代码见：https://github.com/daoshenzzg/springboot2.x-example
本系列文章
- springboot2.x Jackson自定义序列化，优雅实现String、List、Object返回""、[]、{}
- springboot2.x 集成 Mybatis plus(多数据源)，提升20%的开发效率
- springboot2.x 全局异常处理正确方式
- springboot2.x 如何优雅的实现API输出？
- 如何优雅的实现数据置顶、置尾、交换、拖动排序？
