Jersey 开发RESTful（十六） Jersey统一异常处理

WebApplicationException

@Path("exception") public class ExceptionResource {      @POST     @Path("register")     public Response register(@FormParam("name")String username) {         if ("admin".equals(username)) {             throw new WebApplicationException("用户名已经存在!",                     Response.Status.CONFLICT);         } else {             return Response.ok("注册成功!", MediaType.TEXT_PLAIN).build();         }     } }

ExceptionMapper

public interface ExceptionMapper<E extends Throwable> {     Response toResponse(E exception); }

public class JsonMappingExceptionMapper implements ExceptionMapper<JsonMappingException> {     @Override     public Response toResponse(JsonMappingException exception) {         return Response.status(Response.Status.BAD_REQUEST)                   .entity(exception.getMessage())                   .type("text/plain").build();     } }

@Getter public enum ExceptionCode {     DEFAULT_ERROR(0),      PERMISSION_EXCEPTION(1),      MONEY_CHECK_EXCEPTION(2),      ACCOUNT_STATUS_ERROR(3);      private ExceptionCode(int code) {         this.code = code;     }      private int code; }

@Getter public abstract class ApplicationException extends RuntimeException {      private static final long serialVersionUID = 1L;     private ExceptionCode code = ExceptionCode.DEFAULT_ERROR;      public ApplicationException(String msg) {         super(msg);     }      public ApplicationException(String msg, ExceptionCode code) {         super(msg);         this.code = code;     }      public ApplicationException(String msg, ExceptionCode code,             Throwable cause) {         super(msg, cause);         this.code = code;     } }

public class PermissionException extends ApplicationException {      private static final long serialVersionUID = 1L;      public PermissionException(String msg, Throwable ex) {         super(msg, ExceptionCode.PERMISSION_EXCEPTION, ex);     } }

@Provider public class ApplicationExceptionMapper         implements ExceptionMapper<ApplicationException> {      @Override     public Response toResponse(ApplicationException exception) {         AjaxResult result = new AjaxResult(false, exception.getMessage(), null,                 exception.getCode().getCode());         return Response.ok(result, MediaType.APPLICATION_JSON).build();     }  }

@Setter @Getter @NoArgsConstructor @AllArgsConstructor public class AjaxResult {     private boolean success;//请求是否执行成功     private String msg;//本次请求的消息     private Object data;//本次请求可能携带的内容对象     private int code;//如果出现异常，code代表异常类型码 }

@GET @Path("resource") @Produces(MediaType.APPLICATION_JSON) public AjaxResult doSomething(@HeaderParam("token") String token) {     if ("token".equals(token)) {         return new AjaxResult(true, "正常访问资源", "some logic value", 0);     } else {         throw new PermissionException("没有权限访问该资源", null);     } }

下一节，我们将介绍Jersey和Spring以及SpringBoot的集成开发。

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