代码:
package com.scoremanager.utils; import org.apache.poi.hssf.usermodel.*; import javax.servlet.http.HttpServletResponse; import java.io.BufferedOutputStream; import java.lang.reflect.Field; import java.lang.reflect.Method; import java.util.Collection; import java.util.Iterator; /* * 导出Excel的工具类 * */ public class ExportExcelUtils<T> { public void exportExcel(String[] headers, Collection<T> dataset, String fileName, HttpServletResponse response) { // 声明一个工作薄 HSSFWorkbook workbook = new HSSFWorkbook(); // 生成一个表格 HSSFSheet sheet = workbook.createSheet(fileName); // 设置表格默认列宽度为15个字节 sheet.setDefaultColumnWidth((short) 20); // 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); HSSFRichTextString text = new HSSFRichTextString(headers[i]); cell.setCellValue(text); } try { // 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 < headers.length; i++) { HSSFCell cell = row.createCell(i); Field field = fields[i]; String fieldName = field.getName(); String getMethodName = "get" + fieldName.substring(0, 1).toUpperCase() + fieldName.substring(1); 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; // 其它数据类型都当作字符串简单处理 if (value != null && value != "") { textValue = value.toString(); } if (textValue != null) { HSSFRichTextString richString = new HSSFRichTextString(textValue); cell.setCellValue(richString); } } } getExportedFile(workbook, fileName, response); } catch (Exception e) { e.printStackTrace(); } } /** * 方法说明: 指定路径下生成EXCEL文件 * * @return */ public void getExportedFile(HSSFWorkbook workbook, String name, HttpServletResponse response) throws Exception { BufferedOutputStream fos = null; try { String fileName = name + ".xls"; response.setContentType("application/x-msdownload"); response.setHeader("Content-Disposition", "attachment;filename=" + new String(fileName.getBytes("gb2312"), "ISO8859-1")); fos = new BufferedOutputStream(response.getOutputStream()); workbook.write(fos); } catch (Exception e) { e.printStackTrace(); } finally { if (fos != null) { fos.close(); } } } }
jar:
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