fix code

hutool-poi/src/main/java/cn/hutool/poi/excel/StyleSet.java

@@ -1,7 +1,6 @@
 package cn.hutool.poi.excel;
 
-import java.io.Serializable;
-
+import cn.hutool.poi.excel.style.StyleUtil;
 import org.apache.poi.ss.usermodel.BorderStyle;
 import org.apache.poi.ss.usermodel.CellStyle;
 import org.apache.poi.ss.usermodel.FillPatternType;
@@ -11,7 +10,7 @@ import org.apache.poi.ss.usermodel.IndexedColors;
 import org.apache.poi.ss.usermodel.VerticalAlignment;
 import org.apache.poi.ss.usermodel.Workbook;
 
-import cn.hutool.poi.excel.style.StyleUtil;
+import java.io.Serializable;
 
 /**
  * 样式集合，此样式集合汇集了整个工作簿的样式，用于减少样式的创建和冗余
@@ -23,7 +22,7 @@ public class StyleSet implements Serializable{
 	private static final long serialVersionUID = 1L;
 
 	/** 工作簿引用 */
-	private Workbook workbook;
+	private final Workbook workbook;
 	/** 标题样式 */
 	protected CellStyle headCellStyle;
 	/** 默认样式 */

hutool-poi/src/main/java/cn/hutool/poi/excel/sax/Excel03SaxReader.java

@@ -45,7 +45,7 @@ public class Excel03SaxReader extends AbstractExcelSaxReader<Excel03SaxReader> i
 	/**
 	 * 如果为公式，true表示输出公式计算后的结果值，false表示输出公式本身
 	 */
-	private boolean isOutputFormulaValues = true;
+	private final boolean isOutputFormulaValues = true;
 
 	/**
 	 * 用于解析公式
@@ -66,7 +66,7 @@ public class Excel03SaxReader extends AbstractExcelSaxReader<Excel03SaxReader> i
 	/**
 	 * Sheet边界记录，此Record中可以获得Sheet名
 	 */
-	private List<BoundSheetRecord> boundSheetRecords = new ArrayList<>();
+	private final List<BoundSheetRecord> boundSheetRecords = new ArrayList<>();
 
 	private boolean isOutputNextStringRecord;
 
@@ -80,7 +80,7 @@ public class Excel03SaxReader extends AbstractExcelSaxReader<Excel03SaxReader> i
 	// 当前表索引
 	private int curRid = -1;
 
-	private RowHandler rowHandler;
+	private final RowHandler rowHandler;
 
 	/**
 	 * 构造

hutool-poi/src/main/java/cn/hutool/poi/excel/sax/Excel07SaxReader.java

@@ -57,7 +57,7 @@ public class Excel07SaxReader extends AbstractExcelSaxReader<Excel07SaxReader> i
 	// 当前列
 	private int curCell;
 	// 上一次的内容
-	private StringBuilder lastContent = new StringBuilder(64);
+	private final StringBuilder lastContent = new StringBuilder(64);
 	// 单元数据类型
 	private CellDataType cellDataType;
 	// 当前列坐标， 如A1，B5

hutool-poi/src/main/java/cn/hutool/poi/word/PicType.java

@@ -28,7 +28,7 @@ public enum PicType {
 		this.value = value;
 	}
 
-	private int value;
+	private final int value;
 
 	/**
 	 * 获取图片类型对应值

hutool-poi/src/main/java/cn/hutool/poi/word/Word07Writer.java

@@ -28,7 +28,7 @@ import java.io.OutputStream;
  */
 public class Word07Writer implements Closeable {
 
-	private XWPFDocument doc;
+	private final XWPFDocument doc;
 	/**
 	 * 目标文件
 	 */