diff --git a/common/src/main/java/com/jeesite/common/lang/ObjectUtils.java b/common/src/main/java/com/jeesite/common/lang/ObjectUtils.java
index 181151c4..7e32fb90 100644
--- a/common/src/main/java/com/jeesite/common/lang/ObjectUtils.java
+++ b/common/src/main/java/com/jeesite/common/lang/ObjectUtils.java
@@ -14,13 +14,14 @@ import org.apache.commons.lang3.StringUtils;
 import org.apache.commons.lang3.math.NumberUtils;
 import org.nustaq.serialization.FSTConfiguration;
 import org.springframework.beans.BeanUtils;
+import org.springframework.core.NamedThreadLocal;
 
 import com.jeesite.common.io.IOUtils;
 
 /**
  * 对象操作工具类, 继承org.apache.commons.lang3.ObjectUtils类
  * @author ThinkGem
- * @version 2014-6-29
+ * @version 2018-08-11
  */
 public class ObjectUtils extends org.apache.commons.lang3.ObjectUtils {
 
@@ -212,73 +213,14 @@ public class ObjectUtils extends org.apache.commons.lang3.ObjectUtils {
 		}
 		return object;
 	}
-
-//	// Kryo不是线程安全的，所以要建立一个线程变量，每一个线程实例化一次
-//	public static final ThreadLocal<Kryo> kryos = new ThreadLocal<Kryo>() {
-//		@Override
-//		protected Kryo initialValue() {
-//			Kryo kryo = new Kryo();
-//			// 设置false关闭注册行为， Kryo支持对注册行为，如kryo.register(SomeClazz.class);
-//			// 这会赋予该Class一个从0开始的编号，但Kryo使用注册行为最大的问题在于，
-//			// 其不保证同一个Class每一次注册的号码想用，这与注册的顺序有关，也就意味着在不同的机器、
-//			// 同一个机器重启前后都有可能拥有不同的编号，这会导致序列化产生问题，所以在分布式项目中，一般关闭注册行为。
-//			kryo.setRegistrationRequired(false);
-//			// 支持循环引用
-//			kryo.setReferences(true);
-//			return kryo;
-//		};
-//	};
-//
-//	/**
-//	 * Kryo序列化对象
-//	 * @param object
-//	 * @return
-//	 */
-//	public static byte[] serializeKryo(Object object) {
-//		byte[] bytes = null;
-//		Output output = null;
-//		try {
-//			if (object != null) {
-//				output = new Output(1024, -1);
-//				kryos.get().writeClassAndObject(output, object);
-//				bytes = output.toBytes();
-//			}
-//		} catch (Exception e) {
-//			e.printStackTrace();
-//		} finally {
-//			if (output != null) {
-//				output.close();
-//			}
-//		}
-//		return bytes;
-//	}
-//
-//	/**
-//	 * Kryo反序列化对象
-//	 * @param bytes
-//	 * @return
-//	 */
-//	public static Object unserializeKryo(byte[] bytes) {
-//		Object object = null;
-//		Input input = null;
-//		try {
-//			if (bytes != null && bytes.length > 0) {
-//				input = new Input(bytes, 0, bytes.length);
-//				object = kryos.get().readClassAndObject(input);
-//			}
-//		} catch (Exception e) {
-//			e.printStackTrace();
-//		} finally {
-//			if (input != null) {
-//				input.close();
-//			}
-//		}
-//		return object;
-//	}
 	
 	// FST序列化配置对象
-	private static FSTConfiguration fst = FSTConfiguration.createDefaultConfiguration();
-	
+	private static ThreadLocal<FSTConfiguration> fst = new NamedThreadLocal<FSTConfiguration>("FSTConfiguration") {
+		public FSTConfiguration initialValue() {
+			return FSTConfiguration.createDefaultConfiguration();
+		}
+	};
+
 	/**
 	 * FST 序列化对象
 	 * @param object
@@ -289,7 +231,7 @@ public class ObjectUtils extends org.apache.commons.lang3.ObjectUtils {
 			return null;
 		}
 		long beginTime = System.currentTimeMillis();
-		byte[] bytes = fst.asByteArray(object);
+		byte[] bytes = fst.get().asByteArray(object);
 		long totalTime = System.currentTimeMillis() - beginTime;
 		if (totalTime > 3000){
 			System.out.println("Fst serialize time: " + TimeUtils.formatDateAgo(totalTime));
@@ -307,7 +249,7 @@ public class ObjectUtils extends org.apache.commons.lang3.ObjectUtils {
 			return null;
 		}
 		long beginTime = System.currentTimeMillis();
-		Object object = fst.asObject(bytes);
+		Object object = fst.get().asObject(bytes);
 		long totalTime = System.currentTimeMillis() - beginTime;
 		if (totalTime > 3000){
 			System.out.println("Fst unserialize time: " + TimeUtils.formatDateAgo(totalTime));
diff --git a/common/src/main/java/com/jeesite/common/utils/excel/ExcelExport.java b/common/src/main/java/com/jeesite/common/utils/excel/ExcelExport.java
index 2f83f28e..5ff088d8 100644
--- a/common/src/main/java/com/jeesite/common/utils/excel/ExcelExport.java
+++ b/common/src/main/java/com/jeesite/common/utils/excel/ExcelExport.java
@@ -3,6 +3,7 @@
  */
 package com.jeesite.common.utils.excel;
 
+import java.io.Closeable;
 import java.io.FileNotFoundException;
 import java.io.FileOutputStream;
 import java.io.IOException;
@@ -13,8 +14,10 @@ import java.util.Collections;
 import java.util.Comparator;
 import java.util.Date;
 import java.util.HashMap;
+import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
+import java.util.Set;
 
 import javax.servlet.http.HttpServletResponse;
 
@@ -36,6 +39,7 @@ import org.slf4j.LoggerFactory;
 import com.fasterxml.jackson.annotation.JsonFormat;
 import com.jeesite.common.codec.EncodeUtils;
 import com.jeesite.common.collect.ListUtils;
+import com.jeesite.common.collect.SetUtils;
 import com.jeesite.common.lang.ObjectUtils;
 import com.jeesite.common.lang.StringUtils;
 import com.jeesite.common.reflect.ReflectUtils;
@@ -47,9 +51,9 @@ import com.jeesite.common.utils.excel.annotation.ExcelFields;
 /**
  * 导出Excel文件（导出“XLSX”格式，支持大数据量导出   @see org.apache.poi.ss.SpreadsheetVersion）
  * @author ThinkGem
- * @version 2013-04-21
+ * @version 2018-08-11
  */
-public class ExcelExport {
+public class ExcelExport implements Closeable{
 	
 	private static Logger log = LoggerFactory.getLogger(ExcelExport.class);
 			
@@ -76,7 +80,12 @@ public class ExcelExport {
 	/**
 	 * 注解列表（Object[]{ ExcelField, Field/Method }）
 	 */
-	List<Object[]> annotationList;
+	private List<Object[]> annotationList;
+	
+	/**
+	 * 用于清理缓存
+	 */
+	private Set<Class<?>> fieldTypes = SetUtils.newHashSet();
 	
 	/**
 	 * 构造函数
@@ -431,6 +440,7 @@ public class ExcelExport {
 			if(val == null){
 				cell.setCellValue("");
 			}else if(fieldType != Class.class){
+				fieldTypes.add(fieldType); // 先存起来，方便完成后清理缓存
 				cell.setCellValue((String)fieldType.getMethod("setValue", Object.class).invoke(null, val));
 				try{
 					defaultDataFormat = (String)fieldType.getMethod("getDataFormat").invoke(null);
@@ -456,8 +466,11 @@ public class ExcelExport {
 					cell.setCellValue((Date) val);
 					defaultDataFormat = "yyyy-MM-dd HH:mm";
 				}else {
-					cell.setCellValue((String)Class.forName(this.getClass().getName().replaceAll(this.getClass().getSimpleName(), 
-						"fieldtype."+val.getClass().getSimpleName()+"Type")).getMethod("setValue", Object.class).invoke(null, val));
+					// 如果没有指定 fieldType，切自行根据类型查找相应的转换类（com.jeesite.common.utils.excel.fieldtype.值的类名+Type）
+					Class<?> fieldType2 = Class.forName(this.getClass().getName().replaceAll(this.getClass().getSimpleName(), 
+							"fieldtype."+val.getClass().getSimpleName()+"Type"));
+					fieldTypes.add(fieldType2); // 先存起来，方便完成后清理缓存
+					cell.setCellValue((String)fieldType2.getMethod("setValue", Object.class).invoke(null, val));
 				}
 			}
 //			if (val != null){
@@ -574,12 +587,31 @@ public class ExcelExport {
 	
 	/**
 	 * 清理临时文件
+	 * @deprecated see close()
 	 */
 	public ExcelExport dispose(){
+		try {
+			this.close();
+		} catch (Exception e) {
+			e.printStackTrace();
+		}
+		return this;
+	}
+	
+	@Override
+	public void close() {
 		if (wb instanceof SXSSFWorkbook){
 			((SXSSFWorkbook)wb).dispose();
 		}
-		return this;
+		Iterator<Class<?>> it = fieldTypes.iterator();
+		while(it.hasNext()){
+			Class<?> clazz = it.next();
+			try {
+				clazz.getMethod("clearCache").invoke(null);
+			} catch (Exception e) {
+				// 报错忽略，有可能没实现此方法
+			}
+		}
 	}
 	
 //	/**
diff --git a/common/src/main/java/com/jeesite/common/utils/excel/ExcelImport.java b/common/src/main/java/com/jeesite/common/utils/excel/ExcelImport.java
index bb2678f9..ed299cc3 100644
--- a/common/src/main/java/com/jeesite/common/utils/excel/ExcelImport.java
+++ b/common/src/main/java/com/jeesite/common/utils/excel/ExcelImport.java
@@ -3,6 +3,7 @@
  */
 package com.jeesite.common.utils.excel;
 
+import java.io.Closeable;
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.IOException;
@@ -15,6 +16,7 @@ import java.util.Comparator;
 import java.util.Date;
 import java.util.Iterator;
 import java.util.List;
+import java.util.Set;
 
 import org.apache.poi.hssf.usermodel.HSSFDateUtil;
 import org.apache.poi.hssf.usermodel.HSSFWorkbook;
@@ -34,6 +36,7 @@ import org.springframework.web.multipart.MultipartFile;
 
 import com.jeesite.common.callback.MethodCallback;
 import com.jeesite.common.collect.ListUtils;
+import com.jeesite.common.collect.SetUtils;
 import com.jeesite.common.lang.DateUtils;
 import com.jeesite.common.lang.ObjectUtils;
 import com.jeesite.common.lang.StringUtils;
@@ -45,9 +48,9 @@ import com.jeesite.common.utils.excel.annotation.ExcelFields;
 /**
  * 导入Excel文件（支持“XLS”和“XLSX”格式）
  * @author ThinkGem
- * @version 2014-8-19
+ * @version 2018-08-11
  */
-public class ExcelImport {
+public class ExcelImport implements Closeable {
 	
 	private static Logger log = LoggerFactory.getLogger(ExcelImport.class);
 			
@@ -66,6 +69,11 @@ public class ExcelImport {
 	 */
 	private int headerNum;
 	
+	/**
+	 * 用于清理缓存
+	 */
+	private Set<Class<?>> fieldTypes = SetUtils.newHashSet();
+	
 	/**
 	 * 构造函数
 	 * @param path 导入文件对象，读取第一个工作表
@@ -418,6 +426,7 @@ public class ExcelImport {
 					try {
 						if (StringUtils.isNotBlank(ef.attrName())){
 							if (ef.fieldType() != Class.class){
+								fieldTypes.add(ef.fieldType()); // 先存起来，方便完成后清理缓存
 								val = ef.fieldType().getMethod("getValue", String.class).invoke(null, val);
 							}
 						}else{
@@ -445,10 +454,14 @@ public class ExcelImport {
 									}
 								}else{
 									if (ef.fieldType() != Class.class){
+										fieldTypes.add(ef.fieldType()); // 先存起来，方便完成后清理缓存
 										val = ef.fieldType().getMethod("getValue", String.class).invoke(null, val.toString());
 									}else{
-										val = Class.forName(this.getClass().getName().replaceAll(this.getClass().getSimpleName(), 
-												"fieldtype."+valType.getSimpleName()+"Type")).getMethod("getValue", String.class).invoke(null, val.toString());
+										// 如果没有指定 fieldType，切自行根据类型查找相应的转换类（com.jeesite.common.utils.excel.fieldtype.值的类名+Type）
+										Class<?> fieldType2 = Class.forName(this.getClass().getName().replaceAll(this.getClass().getSimpleName(), 
+												"fieldtype."+valType.getSimpleName()+"Type"));
+										fieldTypes.add(fieldType2); // 先存起来，方便完成后清理缓存
+										val = fieldType2.getMethod("getValue", String.class).invoke(null, val.toString());
 									}
 								}
 							}
@@ -481,6 +494,19 @@ public class ExcelImport {
 		}
 		return dataList;
 	}
+	
+	@Override
+	public void close() {
+		Iterator<Class<?>> it = fieldTypes.iterator();
+		while(it.hasNext()){
+			Class<?> clazz = it.next();
+			try {
+				clazz.getMethod("clearCache").invoke(null);
+			} catch (Exception e) {
+				// 报错忽略，有可能没实现此方法
+			}
+		}
+	}
 
 //	/**
 //	 * 导入测试
diff --git a/common/src/main/java/com/jeesite/common/utils/excel/fieldtype/MoneyType.java b/common/src/main/java/com/jeesite/common/utils/excel/fieldtype/MoneyType.java
index 3da5e76b..bafde986 100644
--- a/common/src/main/java/com/jeesite/common/utils/excel/fieldtype/MoneyType.java
+++ b/common/src/main/java/com/jeesite/common/utils/excel/fieldtype/MoneyType.java
@@ -37,4 +37,11 @@ public class MoneyType {
 		return "0.00";
 	}
 	
+	/**
+	 * 清理缓存
+	 */
+	public static void clearCache(){
+		
+	}
+	
 }
diff --git a/modules/core/src/main/java/com/jeesite/common/utils/excel/fieldtype/AreaType.java b/modules/core/src/main/java/com/jeesite/common/utils/excel/fieldtype/AreaType.java
index 1b4269f9..f04172ef 100644
--- a/modules/core/src/main/java/com/jeesite/common/utils/excel/fieldtype/AreaType.java
+++ b/modules/core/src/main/java/com/jeesite/common/utils/excel/fieldtype/AreaType.java
@@ -5,6 +5,8 @@ package com.jeesite.common.utils.excel.fieldtype;
 
 import java.util.List;
 
+import org.springframework.core.NamedThreadLocal;
+
 import com.jeesite.common.lang.StringUtils;
 import com.jeesite.modules.sys.entity.Area;
 import com.jeesite.modules.sys.utils.AreaUtils;
@@ -12,12 +14,12 @@ import com.jeesite.modules.sys.utils.AreaUtils;
 /**
  * 字段类型转换
  * @author ThinkGem
- * @version 2013-03-10
+ * @version 2018-08-11
  * @example fieldType = AreaType.class
  */
 public class AreaType {
 
-	private static ThreadLocal<List<Area>> cache = new ThreadLocal<>();
+	private static ThreadLocal<List<Area>> cache = new NamedThreadLocal<>("AreaType");
 	
 	/**
 	 * 获取对象值（导入）
@@ -45,4 +47,12 @@ public class AreaType {
 		}
 		return "";
 	}
+	
+	/**
+	 * 清理缓存
+	 */
+	public static void clearCache(){
+		cache.remove();
+	}
+	
 }
diff --git a/modules/core/src/main/java/com/jeesite/common/utils/excel/fieldtype/CompanyType.java b/modules/core/src/main/java/com/jeesite/common/utils/excel/fieldtype/CompanyType.java
index b5825bd2..157cbc3b 100644
--- a/modules/core/src/main/java/com/jeesite/common/utils/excel/fieldtype/CompanyType.java
+++ b/modules/core/src/main/java/com/jeesite/common/utils/excel/fieldtype/CompanyType.java
@@ -5,6 +5,8 @@ package com.jeesite.common.utils.excel.fieldtype;
 
 import java.util.List;
 
+import org.springframework.core.NamedThreadLocal;
+
 import com.jeesite.common.lang.StringUtils;
 import com.jeesite.modules.sys.entity.Company;
 import com.jeesite.modules.sys.utils.EmpUtils;
@@ -12,12 +14,12 @@ import com.jeesite.modules.sys.utils.EmpUtils;
 /**
  * 字段类型转换
  * @author ThinkGem
- * @version 2015-03-24
+ * @version 2018-08-11
  * @example fieldType = CompanyType.class
  */
 public class CompanyType {
 
-	private static ThreadLocal<List<Company>> cache = new ThreadLocal<>();
+	private static ThreadLocal<List<Company>> cache = new NamedThreadLocal<>("CompanyType");
 
 	/**
 	 * 获取对象值（导入）
@@ -45,4 +47,11 @@ public class CompanyType {
 		}
 		return "";
 	}
+	
+	/**
+	 * 清理缓存
+	 */
+	public static void clearCache(){
+		cache.remove();
+	}
 }
diff --git a/modules/core/src/main/java/com/jeesite/common/utils/excel/fieldtype/OfficeType.java b/modules/core/src/main/java/com/jeesite/common/utils/excel/fieldtype/OfficeType.java
index d0d1bc0c..b7fc3413 100644
--- a/modules/core/src/main/java/com/jeesite/common/utils/excel/fieldtype/OfficeType.java
+++ b/modules/core/src/main/java/com/jeesite/common/utils/excel/fieldtype/OfficeType.java
@@ -5,6 +5,8 @@ package com.jeesite.common.utils.excel.fieldtype;
 
 import java.util.List;
 
+import org.springframework.core.NamedThreadLocal;
+
 import com.jeesite.common.lang.StringUtils;
 import com.jeesite.modules.sys.entity.Office;
 import com.jeesite.modules.sys.utils.EmpUtils;
@@ -12,12 +14,12 @@ import com.jeesite.modules.sys.utils.EmpUtils;
 /**
  * 字段类型转换
  * @author ThinkGem
- * @version 2013-03-10
+ * @version 2018-08-11
  * @example fieldType = OfficeType.class
  */
 public class OfficeType {
 
-	private static ThreadLocal<List<Office>> cache = new ThreadLocal<>();
+	private static ThreadLocal<List<Office>> cache = new NamedThreadLocal<>("OfficeType");
 	
 	/**
 	 * 获取对象值（导入）
@@ -45,4 +47,11 @@ public class OfficeType {
 		}
 		return "";
 	}
+	
+	/**
+	 * 清理缓存
+	 */
+	public static void clearCache(){
+		cache.remove();
+	}
 }
diff --git a/modules/core/src/main/java/com/jeesite/common/utils/excel/fieldtype/PostListType.java b/modules/core/src/main/java/com/jeesite/common/utils/excel/fieldtype/PostListType.java
index 626fd05f..e08e7c72 100644
--- a/modules/core/src/main/java/com/jeesite/common/utils/excel/fieldtype/PostListType.java
+++ b/modules/core/src/main/java/com/jeesite/common/utils/excel/fieldtype/PostListType.java
@@ -5,6 +5,8 @@ package com.jeesite.common.utils.excel.fieldtype;
 
 import java.util.List;
 
+import org.springframework.core.NamedThreadLocal;
+
 import com.jeesite.common.collect.ListUtils;
 import com.jeesite.common.lang.StringUtils;
 import com.jeesite.common.utils.SpringUtils;
@@ -14,13 +16,13 @@ import com.jeesite.modules.sys.service.PostService;
 /**
  * 字段类型转换
  * @author ThinkGem
- * @version 2015-03-24
+ * @version 2018-08-11
  * @example fieldType = PostListType.class
  */
 public class PostListType {
 
 	private static PostService postService = SpringUtils.getBean(PostService.class);
-	private static ThreadLocal<List<Post>> cache = new ThreadLocal<>();
+	private static ThreadLocal<List<Post>> cache = new NamedThreadLocal<>("PostListType");
 
 	/**
 	 * 获取对象值（导入）
@@ -53,4 +55,11 @@ public class PostListType {
 		}
 		return "";
 	}
+	
+	/**
+	 * 清理缓存
+	 */
+	public static void clearCache(){
+		cache.remove();
+	}
 }
diff --git a/modules/core/src/main/java/com/jeesite/modules/sys/interceptor/LogInterceptor.java b/modules/core/src/main/java/com/jeesite/modules/sys/interceptor/LogInterceptor.java
index c97d5bb3..93734af7 100644
--- a/modules/core/src/main/java/com/jeesite/modules/sys/interceptor/LogInterceptor.java
+++ b/modules/core/src/main/java/com/jeesite/modules/sys/interceptor/LogInterceptor.java
@@ -22,12 +22,12 @@ import com.jeesite.modules.sys.utils.UserUtils;
 /**
  * 日志拦截器
  * @author ThinkGem
- * @version 2014-8-19
+ * @version 2018-08-11
  */
 public class LogInterceptor extends BaseService implements HandlerInterceptor {
 
 	private static final ThreadLocal<Long> startTimeThreadLocal =
-			new NamedThreadLocal<Long>("ThreadLocal StartTime");
+			new NamedThreadLocal<Long>("LogInterceptor StartTime");
 	
 	@Override
 	public boolean preHandle(HttpServletRequest request, HttpServletResponse response, 
diff --git a/modules/core/src/main/java/com/jeesite/modules/sys/service/EmpUserService.java b/modules/core/src/main/java/com/jeesite/modules/sys/service/EmpUserService.java
index a2233322..8c023be9 100644
--- a/modules/core/src/main/java/com/jeesite/modules/sys/service/EmpUserService.java
+++ b/modules/core/src/main/java/com/jeesite/modules/sys/service/EmpUserService.java
@@ -116,8 +116,7 @@ public class EmpUserService extends CrudService<EmpUserDao, EmpUser> {
 		int successNum = 0; int failureNum = 0;
 		StringBuilder successMsg = new StringBuilder();
 		StringBuilder failureMsg = new StringBuilder();
-		try {
-			ExcelImport ei = new ExcelImport(file, 2, 0);
+		try(ExcelImport ei = new ExcelImport(file, 2, 0)){
 			List<EmpUser> list = ei.getDataList(EmpUser.class);
 			for (EmpUser user : list) {
 				try{
diff --git a/modules/core/src/main/java/com/jeesite/modules/sys/web/user/EmpUserController.java b/modules/core/src/main/java/com/jeesite/modules/sys/web/user/EmpUserController.java
index 9785833c..da832d53 100644
--- a/modules/core/src/main/java/com/jeesite/modules/sys/web/user/EmpUserController.java
+++ b/modules/core/src/main/java/com/jeesite/modules/sys/web/user/EmpUserController.java
@@ -177,8 +177,9 @@ public class EmpUserController extends BaseController {
 		}
 		List<EmpUser> list = empUserService.findList(empUser);
 		String fileName = "用户数据" + DateUtils.getDate("yyyyMMddHHmmss") + ".xlsx";
-		new ExcelExport("用户数据", EmpUser.class).setDataList(list)
-				.write(response, fileName).dispose();
+		try(ExcelExport ee = new ExcelExport("用户数据", EmpUser.class)){
+			ee.setDataList(list).write(response, fileName);
+		}
 	}
 
 	/**
@@ -196,8 +197,9 @@ public class EmpUserController extends BaseController {
 		}
 		List<EmpUser> list = ListUtils.newArrayList(empUser);
 		String fileName = "用户数据模板.xlsx";
-		new ExcelExport("用户数据", EmpUser.class, Type.IMPORT).setDataList(list)
-				.write(response, fileName).dispose();
+		try(ExcelExport ee = new ExcelExport("用户数据", EmpUser.class, Type.IMPORT)){
+			ee.setDataList(list).write(response, fileName);
+		}
 	}
 
 	/**
diff --git a/modules/core/src/main/resources/views/modules/sys/sysDesktop.html b/modules/core/src/main/resources/views/modules/sys/sysDesktop.html
index f903c61a..a51eec5b 100644
--- a/modules/core/src/main/resources/views/modules/sys/sysDesktop.html
+++ b/modules/core/src/main/resources/views/modules/sys/sysDesktop.html
@@ -60,7 +60,7 @@
 	<!-- /.row -->
 	<div class="row">
 		<div class="col-md-12">
-			<div class="box">
+			<div class="box box-widget">
 				<div class="box-header with-border">
 					<h3 class="box-title">月度报告</h3>
 					<div class="box-tools pull-right">