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==

省略导包和getter、setter

日志的打印：涉及AOP、Logger

@Aspect@Componentpublic 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

第一步，先在实体类里加验证注释

• @Size
• @Min
• @Max
• @Pattern
  。。。。

@Table(name="t_user")@Entitypublic 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}

第二步：在UserController里相应方法形参里加@Valid

@RestController@RequestMapping("/user")public class UserController {    @AutowiredUserService 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）

统一的返回信息样式（save）

成功的：

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

失败的：

{    "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

第一步：新建一个统一返回信息的类

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;    }}

第二步：新建一个统一管理异常编号的枚举类

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;    }}

第三步：新建一个处理返回数据的类（定义成功返回，失败返回方法）

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;    }}

第四步:自定义一个异常类（extends RuntimeException）

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;    }}

第五步：新建一个处理刚才自定义异常的类

@ControllerAdvicepublic 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。

本人github：https://github.com/StefanPython/stefan.git