系统框架搭建的前期过程中，为了约束代码规范，我们会对一些通用功能做一些处理，比如声明一些系统公用错误类、封装通用返回结果、统一异常处理等，这样做的优势是团队开发过程中能够形成统一的代码规范，增强代码可读性，同时又便于后期代码维护。本文主要介绍下框架中异常的处理：

1.声明全局异常处理类，并添加@ControllerAdvice和@RestController注解
代码如下：

@ControllerAdvice@RestControllerpublic class GlobalExceptionHandler { private final Logger logger = Logger.getLogger(GlobalExceptionHandler.class); //空指针异常 @ExceptionHandler(NullPointerException.class) public Map<String, Object> nullPointer(NullPointerException e,HttpServletRequest req){ logger.error(e.getMessage()); e.printStackTrace(); return ResultObject.newResultObj(ErrorCode.NULLPOINTER); } //IO异常 @ExceptionHandler(IOException.class,HttpServletRequest req, HttpServletResponse res) public Map<String, Object> IOException(IOException e){ logger.error(e.getMessage()); e.printStackTrace(); return ResultObject.newResultObj(ErrorCode.IOEXCEPTION); } //权限不足异常 @ExceptionHandler(UnauthorizedException.class) public Map<String, Object> unauth(HttpServletRequest req, HttpServletResponse res){ return ResultObject.newResultObj(ErrorCode.UNAUTH); } //未登录异常 @ExceptionHandler(AuthorizationException.class) public Map<String, Object> unlogin(HttpServletRequest req, HttpServletResponse res){ return ResultObject.newResultObj(ErrorCode.NOTLOGIN); } //其它异常 @ExceptionHandler(Exception.class) public Map<String, Object> error(Exception e,HttpServletRequest req, HttpServletResponse res){ logger.error(e.getMessage()); e.printStackTrace(); return ResultObject.newResultObj(ErrorCode.SYSTEM); } }

2.声明系统通用错误处理类

/** * 系统通用错误处理类 */public class ErrorCode { //返回码 private int code = 0; //描述信息 private String errmsg = "SUCCESS"; //成功 public static final ErrorCode SUCCESS = new ErrorCode(0,"SUCCESS"); public static final ErrorCode PARAMS = new ErrorCode(100000,"参数错误"); public static final ErrorCode SYSTEM = new ErrorCode(100001,"系统错误"); public static final ErrorCode UNLOGIN = new ErrorCode(100002,"未登录"); public static final ErrorCode UNAUTH = new ErrorCode(100003,"权限错误"); public static final ErrorCode NULLPOINTER = new ErrorCode(100004,"空指针错误"); public static final ErrorCode IOEXCEPTION = new ErrorCode(100005,"IO错误"); public static final ErrorCode UPLOAD_FAIL = new ErrorCode(100006,"文件上传失败"); public static final ErrorCode REPEAT = new ErrorCode(100007,"数据已存在"); public ErrorCode() {} @Override public String toString() { return String.format("{\"errmsg\": \"%s\", \"code\": %d}", errmsg, code); } public int getCode() { return code; } public ErrorCode setCode(int code) { this.code = code; return this; } public String getErrmsg() { return errmsg; } public ErrorCode setErrmsg(String errmsg) { this.errmsg = errmsg; return this; } public ErrorCode(int code, String errmsg) { this.code = code; this.errmsg = errmsg; }}

3.声明全局异常处理类中的结果返回类

import java.util.HashMap;import java.util.Map;import javax.servlet.http.HttpServletResponse;import com.xxx.ErrorCode;//此处引用自己errorCode类所在的包路径import org.json.JSONObject;public class ResultObject { /** * 输出错误信息 * @param errorCode */ public static Map<String, Object> newResultObj(ErrorCode errorCode){ Map<String, Object> obj = new HashMap<String, Object>(); obj.put("code", errorCode.getCode()); obj.put("errmsg", errorCode.getErrmsg()); return obj; } /** * 输出带数据的成功信息 * @param data */ public static Map<String, Object> newResultObj(Object data){ Map<String, Object> obj = new HashMap<String, Object>(); obj.put("code", ErrorCode.SUCCESS.getCode()); obj.put("errmsg", ErrorCode.SUCCESS.getErrmsg()); if(null != data){ obj.put("data", data); } return obj; } /** * 输出带数据的错误信息 * @param errorCode * @param data */ public static Map<String, Object> newResultObj(ErrorCode errorCode, Object data){ Map<String, Object> obj = new HashMap<String, Object>(); obj.put("code", errorCode.getCode()); obj.put("errmsg", errorCode.getErrmsg()); if(null != data){ obj.put("data", data); } return obj; } /** * 输出结果 */ public static void outputResult(HttpServletResponse response, ErrorCode errorCode){ try { JSONObject json = new JSONObject(); json.put("code", errorCode.getCode()); json.put("errmsg", errorCode.getErrmsg()); response.setCharacterEncoding("UTF-8"); response.setContentType("application/json;charset=UTF-8"); response.getWriter().write(json.toString()); } catch (Exception e1) { } }}

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