lombok插件使用
引入依赖,在项目中使用Lombok可以减少很多重复代码的书写。比如说getter/setter/toString等方法的编写 ↓
org.projectlombok lombok 1.16.20
idea中安装lombok插件↓
创建包 entity 编写实体类 User.java（此处使用了 Lombok 简化代码） ↓`
@Data
public class User {
private Long id;
private String name;
private Integer age;
private String email;
}
点击查看注解编译结果↓
统一异常处理
我们想让异常结果也显示为统一的返回结果对象,并且统一处理系统的异常信息,那么需要统一异常处理,
创建统一异常处理类GlobalExceptionHandler.java ↓
package com.ywj.handler;
import com.ywj.constants.ResultCodeEnum;
import com.ywj.exception.MyException;
import com.ywj.util.ExceptionUtil;
import com.ywj.vo.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseBody;
@ControllerAdvice
@Slf4j
public class GlobalExceptionHandler {
//全局异常处理
@ExceptionHandler(Exception.class)
@ResponseBody
public R error(Exception e){
//e.printStackTrace();//输出异常堆栈信息
log.error(e.getMessage());
return R.error();
}
//特定异常处理
@ExceptionHandler(ArithmeticException.class)
@ResponseBody
public R error(ArithmeticException e){
//e.printStackTrace();//输出异常堆栈信息
//log.error(e.getMessage());
log.info("错误信息----------------------------");
log.error(e.getMessage());
return R.setResult(ResultCodeEnum.MY_ERROR);
}
//自定义异常处理
@ExceptionHandler(MyException.class)
@ResponseBody
public R error(MyException e){
//e.printStackTrace();//输出异常堆栈信息
//log.error(e.getMessage());
log.error(ExceptionUtil.getMessage(e));
return R.error().message(e.getMessage()).code(e.getCode());
}
}
创建MyException.java通用异常类,继承RuntimeException↓
package com.ywj.exception;
import com.ywj.constants.ResultCodeEnum;
import lombok.Data;
@Data
//@ApiModel(value = "自定义全局异常类")
public class MyException extends RuntimeException {
//@ApiModelProperty(value = "状态码")
private Integer code;
/**
* 接收状态码和错误消息
* @param code
* @param message
*/
public MyException(Integer code, String message){
super(message);
this.code = code;
}
public MyException(ResultCodeEnum resultCodeEnum){
super(resultCodeEnum.getMessage());
this.code = resultCodeEnum.getCode();
}
@Override
public String toString() {
return "MyException{" +
"code=" + code +
", message=" + this.getMessage() +
'}';
}
}
业务中需要的位置抛出自定义异常↓
package com.ywj.controller;
import com.ywj.exception.MyException;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
@Controller
public class IndexController {
@GetMapping("/")
public String index(Model model){
//System.out.println(10/0);
if (true){
throw new MyException(10086, "自定义异常");
}
System.out.println("index");
model.addAttribute("name", "ywj");
return "index";
}
}
依赖的其他类补充说明↓
统一结果返回类R↓
package com.ywj.vo;
import com.ywj.constants.ResultCodeEnum;
import lombok.Data;
import java.util.HashMap;
import java.util.Map;
@Data
//@ApiModel(value="全局统一返回结果")
public class R {
//@ApiModelProperty(value = "是否成功")
private Boolean success;
//@ApiModelProperty(value = "返回码")
private Integer code;
//@ApiModelProperty(value = "返回消息")
private String message;
//@ApiModelProperty(value = "返回数据")
private Map data = new HashMap();
private R(){}
public static R ok(){
R r = new R();
r.setSuccess(ResultCodeEnum.SUCCESS.getSuccess());
r.setCode(ResultCodeEnum.SUCCESS.getCode());
r.setMessage(ResultCodeEnum.SUCCESS.getMessage());
return r;
}
public static R error(){
R r = new R();
r.setSuccess(ResultCodeEnum.UNKNOWN_REASON.getSuccess());
r.setCode(ResultCodeEnum.UNKNOWN_REASON.getCode());
r.setMessage(ResultCodeEnum.UNKNOWN_REASON.getMessage());
return r;
}
public R data(Map map){
this.setData(map);
return this;
}
public R data(String key, Object value){
this.data.put(key, value);
return this;
}
public R message(String message){
this.setMessage(message);
return this;
}
public R code(Integer code){
this.setCode(code);
return this;
}
public R success(Boolean success){
this.setSuccess(success);
return this;
}
public static R setResult(ResultCodeEnum resultCodeEnum){
R r = new R();
r.setSuccess(resultCodeEnum.getSuccess());
r.setCode(resultCodeEnum.getCode());
r.setMessage(resultCodeEnum.getMessage());
return r;
}
}
结果枚举常量类ResultCodeEnum↓
package com.ywj.constants;
import lombok.Getter;
@Getter
public enum ResultCodeEnum {
SUCCESS(true, 20000,"成功"),
UNKNOWN_REASON(false, 20001, "未知错误"),
BAD_SQL_GRAMMAR(false, 21001, "sql语法错误"),
JSON_PARSE_ERROR(false, 21002, "json解析异常"),
PARAM_ERROR(false, 21003, "参数不正确"),
FILE_UPLOAD_ERROR(false, 21004, "文件上传错误"),
EXCEL_DATA_IMPORT_ERROR(false, 21005, "Excel数据导入错误"),
MY_ERROR(false, 21006, "算术异常错误");
private Boolean success;//响应是否成功
private Integer code;//返回码
private String message;//返回消息
ResultCodeEnum(Boolean success, Integer code, String message) {
this.success = success;
this.code = code;
this.message = message;
}
}
异常栈信息输出工具类ExceptionUtil↓
package com.ywj.util;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.StringWriter;
public class ExceptionUtil {
public static String getMessage(Exception e) {
StringWriter sw = null;
PrintWriter pw = null;
try {
sw = new StringWriter();
pw = new PrintWriter(sw);
// 将出错的栈信息输出到printWriter中
e.printStackTrace(pw);
pw.flush();
sw.flush();
} finally {
if (sw != null) {
try {
sw.close();
} catch (IOException e1) {
e1.printStackTrace();
}
}
if (pw != null) {
pw.close();
}
}
return sw.toString();
}
}
上面只是解释说明一下,直接拷贝资料文件夹的相关类到公司包即可,比如拷贝到ywj包下,项目结构如下↓
统一日志输出
配置日志级别↓
日志记录器（Logger）的行为是分等级的。如下表所示：
分为：OFF、FATAL、ERROR、WARN、INFO、DEBUG、ALL
默认情况下，spring boot从控制台打印出来的日志级别只有INFO及以上级别，可以配置日志级别↓
# 设置日志级别 logging.level.root=WARN
以上方式只能将日志打印在控制台上 ↑
Logback日志↓
spring boot内部使用Logback作为日志实现的框架。
Logback和log4j非常相似，如果你对log4j很熟悉，那对logback很快就会得心应手。
配置logback日志↓
删除application.properties中的日志配置
安装idea彩色日志插件：grep-console
resources 中创建 logback-spring.xml
logback INFO ${CONSOLE_LOG_PATTERN} UTF-8 ${log.path}/log_info.log %d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{50} - %msg%n UTF-8 ${log.path}/info/log-info-%d{yyyy-MM-dd}.%i.log 100MB 15 INFO ACCEPT DENY ${log.path}/log_warn.log %d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{50} - %msg%n UTF-8 ${log.path}/warn/log-warn-%d{yyyy-MM-dd}.%i.log 100MB 15 warn ACCEPT DENY ${log.path}/log_error.log %d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{50} - %msg%n UTF-8 ${log.path}/error/log-error-%d{yyyy-MM-dd}.%i.log 100MB 15 ERROR ACCEPT DENY
最后,别忘了,在application.yml配置文件中用profiles激活dev开发环境或其他环境比如生产环境pro等↓
server:
port: 8888
spring:
mvc:
view:
prefix: /WEB-INF/jsp/
suffix: .jsp
profiles:
active: dev
#logging:
# level:
# root: warn
复制粘贴即可
其实,上面都只是解释一下,不想太麻烦,直接拷贝资料文件夹的里面的相关类和日志配置文件到项目中即可↑↓
以上为个人经验，希望能给大家一个参考，也希望大家多多支持脚本之家。