Servlet 中使用POI生成Excel
使用的是poi3.13
http://mvnrepository.com/artifact/org.apache.poi/poi/3.13
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.util.Iterator; import java.util.List; import java.util.logging.Level; import java.util.logging.Logger; import org.apache.poi.hssf.usermodel.HSSFCell; import org.apache.poi.hssf.usermodel.HSSFCellStyle; import org.apache.poi.hssf.usermodel.HSSFFont; 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; /** * @author yan * @param <T> * @date 2016-12-6 20:38:24 * @version V1.0 * @desc */ public class ExcelUtil<T> { public HSSFWorkbook exportExcel(String title, String[] headers, List<T> dataset) { // 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); // 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; try { 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); Class tCls = t.getClass(); Method getMethod = tCls.getMethod(getMethodName, new Class[]{}); Object value = getMethod.invoke(t, new Object[]{}); //全部当做字符串来处理 String textValue = value.toString(); if (textValue != null) { HSSFRichTextString richString = new HSSFRichTextString(textValue); HSSFFont font3 = workbook.createFont(); font3.setColor(HSSFColor.BLUE.index); richString.applyFont(font3); cell.setCellValue(richString); } } } } catch (NoSuchMethodException ex) { Logger.getLogger(NewServlet.class.getName()).log(Level.SEVERE, null, ex); } catch (SecurityException ex) { Logger.getLogger(NewServlet.class.getName()).log(Level.SEVERE, null, ex); } catch (IllegalAccessException ex) { Logger.getLogger(NewServlet.class.getName()).log(Level.SEVERE, null, ex); } catch (IllegalArgumentException ex) { Logger.getLogger(NewServlet.class.getName()).log(Level.SEVERE, null, ex); } catch (InvocationTargetException ex) { Logger.getLogger(NewServlet.class.getName()).log(Level.SEVERE, null, ex); } return workbook; } }
import java.io.IOException; import java.io.OutputStream; import java.io.UnsupportedEncodingException; import java.net.URLEncoder; import java.util.ArrayList; import java.util.List; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.commons.codec.binary.Base64; import org.apache.poi.hssf.usermodel.HSSFWorkbook; /** * * @author yan */ public class NewServlet extends HttpServlet { protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setHeader("Connection", "close"); response.setHeader("Content-Type", "application/vnd.ms-excel;charset=UTF-8"); String filename = System.currentTimeMillis() + "学生信息.xls"; filename = encodeFileName(request, filename); response.setHeader("Content-Disposition", "attachment;filename=" + filename); OutputStream out = null; try { String[] headers = { "姓名", "年龄"}; List<Student> dataset = new ArrayList<Student>(); dataset.add(new Student("张三张三张三张三张三张三", "20")); dataset.add(new Student("李四", "24")); dataset.add(new Student("王五王五王五王五王五王五王五王五", "2211111111111123213")); ExcelUtil<Student> eu = new ExcelUtil<Student>(); HSSFWorkbook workbook = eu.exportExcel("发票领用",headers,dataset); out = response.getOutputStream(); workbook.write(out); } finally { if(out!=null){ out.close(); } } } public String encodeFileName(HttpServletRequest request, String fileName) throws UnsupportedEncodingException { String agent = request.getHeader("USER-AGENT"); if (null != agent && -1 != agent.indexOf("MSIE")) { return URLEncoder.encode(fileName, "UTF-8"); } else if (null != agent && -1 != agent.indexOf("Mozilla")) { return "=?UTF-8?B?"+ (new String(Base64.encodeBase64(fileName.getBytes("UTF-8")))) + "?="; } else { return fileName; } } @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { processRequest(request, response); } @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { processRequest(request, response); } }
