🎨 改进结构和代码格式，删除无用引入等

pigx-common/pigx-common-security/src/main/java/com/pig4cloud/pigx/common/security/component/PigxAuth2ExceptionSerializer.java

@@ -24,8 +24,6 @@ import com.pig4cloud.pigx.common.core.constant.CommonConstants;
 import com.pig4cloud.pigx.common.security.exception.PigxAuth2Exception;
 import lombok.SneakyThrows;
 
-import java.io.IOException;
-
 /**
  * @author lengleng
  * @date 2018/11/16

pigx-common/pigx-common-security/src/main/java/com/pig4cloud/pigx/common/security/component/ResourceAuthExceptionEntryPoint.java

@@ -31,7 +31,6 @@ import org.springframework.stereotype.Component;
 
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
-import java.io.IOException;
 import java.io.PrintWriter;
 
 /**

pigx-common/pigx-common-security/src/main/java/com/pig4cloud/pigx/common/security/util/AuthUtils.java

@@ -25,7 +25,6 @@ import lombok.extern.slf4j.Slf4j;
 import org.springframework.http.HttpHeaders;
 
 import javax.servlet.http.HttpServletRequest;
-import java.io.IOException;
 
 /**
  * @author lengleng