springboot实际项目：日志打印、表单验证、异常处理

第一个比较系统的springboot的一个测试项目

涉及的知识有==日志的打印==、==表单的验证==、==异常的统一处理==

日志的打印：涉及AOP、Logger

@Aspect
@Component
public class HttpAspect {
private final static Logger logger = LoggerFactory.getLogger(HttpAspect.class);
@Pointcut("execution(public * com.stefan.demo.controller.UserController.*(..))")
public void log(){
}
@Before("log()")
public void doBefore(JoinPoint joinPoint){
ServletRequestAttributes attributes= (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
HttpServletRequest request=attributes.getRequest();
//url
logger.info("url={}",request.getRequestURI());
// /method
logger.info("method={}",request.getMethod());
//ip
logger.info("ip={}",request.getRemoteAddr());
//类方法
logger.info("class_method={}",joinPoint.getSignature().getDeclaringTypeName() + "." + joinPoint.getSignature().getName());
//参数
logger.info("args={}", joinPoint.getArgs());
//
System.out.println("前aop");
}
@After("log()")
public void doAfter(){
System.out.println("后aop");
}
@AfterReturning(returning = "object",pointcut = "log()")
public void doAfterReturning(Object object){
logger.info("response={}",object.toString());
}
}

表单的验证

@Tabl
4000
e(name="t_user")
@Entity
public class user {
@Id
@GeneratedValue
private Integer id;
@Size(min = 2, max = 20, message = "姓名长度必须大于 2 且小于 20 字")
private String name;
private String password;
@Min(value=18,message="年龄必须大于18岁")
@Max(value=60,message = "年龄必须小于60岁")
private Integer age;
@Pattern(regexp = "(男)|(女)",message = "性别只能为男，女")
private String sex;
@Pattern(regexp="[0-9]{11}",message = "手机号为11位")
private String phone;
#省略getter、setter方法
}

@RestController
@RequestMapping("/user")
public class UserController {
@Autowired
UserService us;
@GetMapping("/save")
public Result<user> save(@Valid   user user,BindingResult bindingResult){
if (bindingResult.hasErrors()){
return ResultUtil.error(bindingResult.getFieldError().getDefaultMessage());
}
return ResultUtil.success(us.addUser(user));
}
}

异常统一处理（涉及到新建自定义异常类、管理错误编号、统一格式返回信息）

{
"code": 0,
"msg": "成功",
"data": {
"id": 17,
"name": "xxxxx",
"password": null,
"age": null,
"sex": null,
"phone": null
}
}

{
"code": 1,
"msg": "姓名长度必须大于 2 且小于 20 字",
"data": null
}

统一异常处理具体步骤

public class Result<T> {
//错误码
private Integer code;
//提示信息
private String msg;
//具体的内容
private T data;
public Result() {
}
public Result(Integer code, String msg) {
this.code = code;
this.msg = msg;
}
}

public enum ResultEnum {
UNKNOW_ERROR(-1,"未知错误"),
SUCCESS(0, "成功"),
ERROR(1,""),
YOUNG(100,"你正处于职业发展期"),
OLD(101,"你马上就要退休了"),
;
private  Integer code;
private String msg;
ResultEnum(Integer code, String msg) {
this.code = code;
this.msg = msg;
}
public Integer getCode() {
return code;
}
public String getMsg() {
return msg;
}
}

public class ResultUtil {
public static Result success(Object object){
Result result = new Result();
result.setCode(ResultEnum.SUCCESS.getCode());
result.setMsg(ResultEnum.SUCCESS.getMsg());
result.setData(object);
return result;
}
public static Result success() {
return success(null);
}
public static Result error(String msg) {
Result result = new Result();
result.setCode(ResultEnum.ERROR.getCode());
result.setMsg(msg);
return result;
}
public static  Result error(ResultEnum re){
Result result = new Result();
result.setCode(ResultEnum.UNKNOW_ERROR.getCode());
result.setMsg(ResultEnum.UNKNOW_ERROR.getMsg());
return result;
}
}

public class MyException extends RuntimeException {
private Integer code;
public MyException(ResultEnum re) {
super(re.getMsg());
this.code = re.getCode();
}
public Integer getCode() {
return code;
}
public void setCode(Integer code) {
this.code = code;
}
}

@ControllerAdvice
public class ExceptionHandle {
private final static Logger logger = LoggerFactory.getLogger(ExceptionHandle.class);
@ExceptionHandler(value = Exception.class)
@ResponseBody
public Result handle(Exception e){
if (e instanceof MyException){
MyException myException=(MyException) e;
return ResultUtil.error(e.getMessage());
}else{
logger.error("【系统异常】{}", e);
return ResultUtil.error(ResultEnum.UNKNOW_ERROR);

}
}
}

这个springboot项目还是十分简陋的，笔者也在学习当中，关于springboot的实战知识会不断更新，希望能够跟外界有个很好的交流。