java中使用poi导出excel表格数据并且可以手动修改导出路径

　　在我们开发项目中，很多时候会提出这样的需求：将前端的某某数据以excel表格导出，今天就给大家写一个简单的模板。

　　这里我们选择使用poi导出excel:

　　第一步：导入需要的jar包到 lib 文件夹下

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" 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　　　jar包下载路径：http://download.csdn.net/download/pumpkin09/7077011

　　第二步：添加poi导出工具类

　　　　

 package com.yjd.admin.util;

 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.Collection;
 import java.util.Date;
 import java.util.Iterator;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;

 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.HSSFComment;
 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;

 /**
  * 利用开源组件POI3.0.2动态导出EXCEL文档 转载时请保留以下信息，注明出处！
  *
  * @author leno
  * @version v1.0
  * @param <T>
  *            应用泛型，代表任意一个符合javabean风格的类
  *            注意这里为了简单起见，boolean型的属性xxx的get器方式为getXxx(),而不是isXxx()
  *            byte[]表jpg格式的图片数据
  */
 public class ExportExcel<T> {
     public void exportExcel(Collection<T> dataset, OutputStream out) {
         exportExcel("测试POI导出EXCEL文档", null, dataset, out, "yyyy-MM-dd");
     }

     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[] headers, Collection<T> dataset,
             OutputStream out, String pattern) {
         exportExcel("测试POI导出EXCEL文档", headers, dataset, out, pattern);
     }

     /**
      * 这是一个通用的方法，利用了JAVA的反射机制，可以将放置在JAVA集合中并且符号一定条件的数据以EXCEL 的形式输出到指定IO设备上
      *
      * @param title
      *            表格标题名
      * @param headers
      *            表格属性列名数组
      * @param dataset
      *            需要显示的数据集合,集合中一定要放置符合javabean风格的类的对象。此方法支持的
      *            javabean属性的数据类型有基本数据类型及String,Date,byte[](图片数据)
      * @param out
      *            与输出设备关联的流对象，可以将EXCEL文档导出到本地文件或者网络中
      * @param pattern
      *            如果有时间数据，设定输出格式。默认为"yyy-MM-dd"
      */
     @SuppressWarnings("unchecked")
     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);
         // 生成一个字体
         HSSFFont font = workbook.createFont();
         font.setColor(HSSFColor.VIOLET.index);
         font.setFontHeightInPoints((short) 12);
         font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
         // 把字体应用到当前的样式
         style.setFont(font);
         // 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);
         // 生成另一个字体
         HSSFFont font2 = workbook.createFont();
         font2.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);
         // 把字体应用到当前的样式
         style2.setFont(font2);
         // 声明一个画图的*管理器
         HSSFPatriarch patriarch = sheet.createDrawingPatriarch();
         // 定义注释的大小和位置,详见文档
         HSSFComment comment = patriarch.createComment(new HSSFClientAnchor(0,
                 0, 0, 0, (short) 4, 2, (short) 6, 5));
         // 设置注释内容
         comment.setString(new HSSFRichTextString("可以在POI中添加注释！"));
         // 设置注释作者，当鼠标移动到单元格上是可以在状态栏中看到该内容.
         comment.setAuthor("leno");
         // 产生表格标题行
         HSSFRow row = sheet.createRow(0);
         for (short i = 0; i < headers.length; i++) {
             HSSFCell cell = row.createCell(i);
             cell.setCellStyle(style);
             HSSFRichTextString text = new HSSFRichTextString(headers[i]);
             cell.setCellValue(text);
         }
         // 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];
                 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 Integer) {
                     // int intValue = (Integer) value;
                     // cell.setCellValue(intValue);
                     // } else if (value instanceof Float) {
                     // float fValue = (Float) value;
                     // textValue = new HSSFRichTextString(
                     // String.valueOf(fValue));
                     // cell.setCellValue(textValue);
                     // } else if (value instanceof Double) {
                     // double dValue = (Double) value;
                     // textValue = new HSSFRichTextString(
                     // String.valueOf(dValue));
                     // cell.setCellValue(textValue);
                     // } else if (value instanceof Long) {
                     // long longValue = (Long) value;
                     // cell.setCellValue(longValue);
                     // }
                     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 {
                             HSSFRichTextString richString = new HSSFRichTextString(
                                     textValue);
                             HSSFFont font3 = workbook.createFont();
                             font3.setColor(HSSFColor.BLUE.index);
                             richString.applyFont(font3);
                             cell.setCellValue(richString);
                         }
                     }
                 } catch (SecurityException e) {
                     e.printStackTrace();
                 } catch (NoSuchMethodException e) {
                     e.printStackTrace();
                 } catch (IllegalArgumentException e) {
                     e.printStackTrace();
                 } catch (IllegalAccessException e) {
                     e.printStackTrace();
                 } catch (InvocationTargetException e) {
                     e.printStackTrace();
                 } finally {
                     // 清理资源
                 }
             }
         }
         try {
             workbook.write(out);
         } catch (IOException e) {
             e.printStackTrace();
         }
     }

 }

　　第三步：由于我使用的的spring-mvc框架，所以在Controller调用上面的工具类ExportExcel

　

 package com.yjd.admin.vo;

 import java.util.Date;

 public class P2pLoanPlanVo {
          private Date repayDate;
         private double repayAmount;
         private Integer repayDays;
         private Integer repayYqDays;
         private Double lateAmount;
         private String isPosPaid;
         private String statusName;
         private String isSysPay;
         public Date getRepayDate() {
             return repayDate;
         }
         public void setRepayDate(Date repayDate) {
             this.repayDate = repayDate;
         }
         public double getRepayAmount() {
             return repayAmount;
         }
         public void setRepayAmount(double repayAmount) {
             this.repayAmount = repayAmount;
         }
         public Integer getRepayDays() {
             return repayDays;
         }
         public void setRepayDays(Integer repayDays) {
             this.repayDays = repayDays;
         }
         public Integer getRepayYqDays() {
             return repayYqDays;
         }
         public void setRepayYqDays(Integer repayYqDays) {
             this.repayYqDays = repayYqDays;
         }
         public Double getLateAmount() {
             return lateAmount;
         }
         public void setLateAmount(Double lateAmount) {
             this.lateAmount = lateAmount;
         }
         public String getIsPosPaid() {
             return isPosPaid;
         }
         public void setIsPosPaid(String isPosPaid) {
             this.isPosPaid = isPosPaid;
         }
         public String getStatusName() {
             return statusName;
         }
         public void setStatusName(String statusName) {
             this.statusName = statusName;
         }
         public String getIsSysPay() {
             return isSysPay;
         }
         public void setIsSysPay(String isSysPay) {
             this.isSysPay = isSysPay;
         }

 }

 /**
      * 导出excel数据
      * @param id
      * @param m
      * @return
      */
     @RequestMapping("/exportExcel")
     public void exportExcel(@RequestParam("id") Integer id, Model m,HttpServletRequest req, HttpServletResponse resp) {
         try {

             ExportExcel<P2pLoanPlanVo> ex = new ExportExcel<P2pLoanPlanVo>();
             String[] headers = {"最迟还款日", "还款金额","剩余几天","逾期几天", "罚息","是否垫付","状态","是否发放收益"};
             List<P2pLoanPlanVo> dataset = new ArrayList<P2pLoanPlanVo>();
             List<P2pLoanPlan> plans = this.planService.getListByLoan(id);
             for (int i = 0; i < plans.size(); i++) {
                 P2pLoanPlanVo p2pLoanPlanVo = new P2pLoanPlanVo();

                 p2pLoanPlanVo.setRepayDate(plans.get(i).getRepayDate());
                 p2pLoanPlanVo.setRepayAmount(plans.get(i).getRepayAmount());

                 if(plans.get(i).getRepayDays() >= 0 && plans.get(i).getStatus() == 0){
                     p2pLoanPlanVo.setRepayDays(plans.get(i).getRepayDays());
                 }else{
                     p2pLoanPlanVo.setRepayDays(0);
                 }
                 if(plans.get(i).getRepayDays() < 0 && plans.get(i).getStatus() == 0){
                     p2pLoanPlanVo.setRepayYqDays(-plans.get(i).getRepayDays());
                 }else{
                     p2pLoanPlanVo.setRepayYqDays(0);
                 }

                 p2pLoanPlanVo.setLateAmount(plans.get(i).getLateAmount());
                 String IsPosPaid = "";
                 if(plans.get(i).getIsPosPaid()==true){
                     IsPosPaid = "已垫付";
                 }else{
                     IsPosPaid = "未垫付";
                 }
                 p2pLoanPlanVo.setIsPosPaid(IsPosPaid);
                 p2pLoanPlanVo.setStatusName(plans.get(i).getStatusName());
                 String IsSysPay ="";
                 if(plans.get(i).getIsSysPay() == true){
                     IsSysPay = "已发放收益";
                 }else{
                     IsSysPay = "未发放收益";
                 }
                 p2pLoanPlanVo.setIsSysPay(IsSysPay);

                 dataset.add(p2pLoanPlanVo);

             }
             try {
                 req.setCharacterEncoding("UTF-8");
                 resp.setCharacterEncoding("UTF-8");
                 resp.setContentType("application/x-download");

                 String filedisplay = "还款计划.xls";
                 //防止文件名含有中文乱码
                 filedisplay = new String( filedisplay.getBytes("gb2312"), "ISO8859-1" );
                 resp.setHeader("Content-Disposition", "attachment;filename="+ filedisplay);

                 OutputStream out = resp.getOutputStream();
                 ex.exportExcel(headers, dataset, out);
                 out.close();
             } catch (FileNotFoundException e) {
                 e.printStackTrace();
             } catch (IOException e) {
                 e.printStackTrace();
             }
         } catch (Exception e) {
             Exceptions.getExceptionMsg(e, logger);
         }
     }

注意：此处ExportExcel<T>工具类中的泛型对应P2pLoanPlanVo这个类，P2pLoanPlanVo类中的属性要对应exportExcel（）接口中headers中每个值并且都要有值，不允许为空，若有不足的地方还望各位大神多多指点！

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