使用POI导出日志到EXCEL表格中，EXCEL表格中的值是乱码

Question

package com.wonders.oa.bslogic.system.imout;
import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Date;
import java.util.Iterator;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;import javax.swing.JOptionPane;import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFClientAnchor;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFPatriarch;
import org.apache.poi.hssf.usermodel.HSSFRichTextString;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.util.HSSFColor;/
public class ExportExcel<T> {    public void exportExcel(String[] headers, Collection<T> dataset,          OutputStream out) {       exportExcel("测试POI导出EXCEL文档", headers, dataset, out, "yyyy-MM-dd");
   public void exportExcel(String title, String[] headers,          Collection<T> dataset, OutputStream out, String pattern) {       // 声明一个工作薄       HSSFWorkbook workbook = new HSSFWorkbook();       // 生成一个表格       HSSFSheet sheet = workbook.createSheet(title);
     
          // 设置表格默认列宽度为15个字节       sheet.setDefaultColumnWidth((short) 15);       // 生成一个样式       HSSFCellStyle style = workbook.createCellStyle();       // 设置这些样式       style.setFillForegroundColor(HSSFColor.SKY_BLUE.index);       style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);       style.setBorderBottom(HSSFCellStyle.BORDER_THIN);       style.setBorderLeft(HSSFCellStyle.BORDER_THIN);       style.setBorderRight(HSSFCellStyle.BORDER_THIN);       style.setBorderTop(HSSFCellStyle.BORDER_THIN);       style.setAlignment(HSSFCellStyle.ALIGN_CENTER);  
      // 生成并设置另一个样式       HSSFCellStyle style2 = workbook.createCellStyle();       style2.setFillForegroundColor(HSSFColor.LIGHT_YELLOW.index);       style2.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);       style2.setBorderBottom(HSSFCellStyle.BORDER_THIN);       style2.setBorderLeft(HSSFCellStyle.BORDER_THIN);       style2.setBorderRight(HSSFCellStyle.BORDER_THIN);       style2.setBorderTop(HSSFCellStyle.BORDER_THIN);       style2.setAlignment(HSSFCellStyle.ALIGN_CENTER);       style2.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);                      //产生表格标题行
sheet.setSheetName(0,“实验项目列表－－中文测试“,HSSFWorkbook.ENCODING_UTF_16); //设置中文编码
sheet点没有这个方法，直接报错       HSSFRow row = sheet.createRow(0);       for (short i = 0; i < headers.length; i++) {          HSSFCell cell = row.createCell(i);//到网上查的说要定义其编码格式 cell.setEncoding(HSSFCell.ENCODING_UTF_16); 但点不出来，压根就没这个方法，强制写上去就报错
         
         cell.setCellValue(headers[i]);
         
         cell.setCellStyle(style);           }       //遍历集合数据，产生数据行       Iterator<T> it = dataset.iterator();       int index = 0;       while (it.hasNext()) {          index++;          row = sheet.createRow(index);          T t = (T) it.next();
                  //利用反射，根据javabean属性的先后顺序，动态调用getXxx()方法得到属性值          Field[] fields = t.getClass().getDeclaredFields();          for (short i = 0; i < fields.length; i++) {             HSSFCell cell = row.createCell(i);             cell.setCellStyle(style2);             Field field = fields[i];
            
            System.out.println(fields[i]+"llllllll");             String fieldName = field.getName();             String getMethodName = "get"                    + fieldName.substring(0, 1).toUpperCase()                    + fieldName.substring(1);             try {                 Class tCls = t.getClass();                 Method getMethod = tCls.getMethod(getMethodName,                       new Class[] {});                 Object value = getMethod.invoke(t, new Object[] {});                 //判断值的类型后进行强制类型转换                 String textValue = null;
                if (value instanceof Boolean) {                    boolean bValue = (Boolean) value;                    textValue = "男";                    if (!bValue) {                       textValue ="女";                    }                 } else if (value instanceof Date) {                    Date date = (Date) value;                    SimpleDateFormat sdf = new SimpleDateFormat(pattern);                     textValue = sdf.format(date);                 }  else if (value instanceof byte[]) {                    // 有图片时，设置行高为60px;                    row.setHeightInPoints(60);                    // 设置图片所在列宽度为80px,注意这里单位的一个换算                    sheet.setColumnWidth(i, (short) (35.7 * 80));                    // sheet.autoSizeColumn(i);                    byte[] bsValue = (byte[]) value;                    HSSFClientAnchor anchor = new HSSFClientAnchor(0, 0,                          1023, 255, (short) 6, index, (short) 6, index);                    anchor.setAnchorType(2);                    patriarch.createPicture(anchor, workbook.addPicture(                          bsValue, HSSFWorkbook.PICTURE_TYPE_JPEG));                 } else{                    //其它数据类型都当作字符串简单处理                    textValue = value.toString();                 }                 //如果不是图片数据，就利用正则表达式判断textValue是否全部由数字组成                 if(textValue!=null){                    Pattern p = Pattern.compile("");//("^""d+("".""d+)?$");                       Matcher matcher = p.matcher(textValue);                    if(matcher.matches()){                       //是数字当作double处理                       cell.setCellValue(Double.parseDouble(textValue));                    }else{
                          cell.setCellValue(textValue);                    }                 }             } catch (SecurityException e) {                 // TODO Auto-generated catch block                 e.printStackTrace();             } catch (NoSuchMethodException e) {                 // TODO Auto-generated catch block                 e.printStackTrace();             } catch (IllegalArgumentException e) {                 // TODO Auto-generated catch block                 e.printStackTrace();             } catch (IllegalAccessException e) {                 // TODO Auto-generated catch block                 e.printStackTrace();             } catch (InvocationTargetException e) {                 // TODO Auto-generated catch block                 e.printStackTrace();             } finally {                 //清理资源             }          }       }
      }    }
}
帮忙看一下！谢谢