java如何生成可变表头的excel(excel,java,可变表头,编程语言)

import java.io.BufferedInputStream;import java.io.File;import java.io.FileInputStream;import java.io.IOException;import java.io.InputStream;import java.util.Properties;public class GetFilePlace { /** * 读取文件，获取excel保存的根目录 * @return excel保存的根目录 */ public String getFilePath() { String dir = System.getProperty("user.dir"); //获得tomcat所在的工作路径 //获取到存储了文件存储位置的filedir.properties 文件路径 String realDir = dir + File.separator + "src" + File.separator +"META-INF" + File.separator + "filedir.properties"; /*String realDir = dir.substring(0, dir.length()-4) + File.separator +"webapps" + File.separator + "generateExcels" + File.separator + "classes" + File.separator + "META-INF" + File.separator + "config" + File.separator + "filedir.properties"; */ return realDir; } /** * 获取filePath路径【properities文件】中key对应的值， * @param filePath properities文件路径【包含properities文件】 * @param key 要查找的key值 * @return key对应的value */ public String GetValueByKey(String filePath, String key) { Properties pps = new Properties(); try { InputStream in = new BufferedInputStream (new FileInputStream(filePath)); pps.load(in); String value = pps.getProperty(key); in.close(); return value; }catch (IOException e) { e.printStackTrace(); return null; } } /** * 查询properities文件中可以对应的存储地点 * @param key 查询主键 * @return key对应的存储地址 */ public String getFileDirFromProperties(String key) { return GetValueByKey(getFilePath(),key); } public static void main(String[] args) { System.out.println(new GetFilePlace().getFileDirFromProperties("filePath")); }}

import java.io.File;import java.text.SimpleDateFormat;import java.util.Calendar;public class GenerateFold{ /** * 查询当前生成的excel需要存在在哪个路径，如果存在则存储在相应的位置，否则生成改目录， 每天生成一个文件夹，文件夹的命名规则为 年月日的时间戳 * @param foldName 生成excel保存路径 * @return 现在的excel需要保存路径 */ public String getFold(String foldName) { SimpleDateFormat format = new SimpleDateFormat("yyyyMMdd"); String todayStr = format.format(Calendar.getInstance().getTime()); String foldPath = foldName + File.separator + todayStr; File file = new File(foldPath); if(!file.exists() && !file.isDirectory()) { System.out.println("不存在"); file.mkdirs(); } else { System.out.println("存在"); } return foldPath; }}

import java.io.File;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.io.OutputStream;import java.lang.reflect.InvocationTargetException;import java.lang.reflect.Method;import java.text.SimpleDateFormat;import java.util.ArrayList;import java.util.Calendar;import java.util.List;import java.util.UUID;import org.apache.poi.hssf.usermodel.HSSFCell;import org.apache.poi.hssf.usermodel.HSSFCellStyle;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.Region;import org.apache.poi.ss.usermodel.CellStyle;import com.zcr.until.GetFilePlace;import com.zcr.until.User;/** * 生成excel * @author zcr * */public class GenerateExcel{ /** * 通过关键字查询properties文件相应文件的存储位置，根据表头顺序将数据保存到相应文件路径的xls文件中, 文件的命名规则是时间戳加一串全球唯一编码 * @param fileDir //查找文件存储根目录 * @param head //表头 * @param list //数据 * @return //文件的保存路径及其名字的字符串 */ public <T> String generateExcels(String fileDir,String [] head,List<T> list) { //获得存储的路径 //String savePath = new GetFilePlace().getFileDirFromProperties(key); //文件存储名字 String saveFileName = ""; SimpleDateFormat format = new SimpleDateFormat("yyyyMMddHHmmssSS"); saveFileName += format.format(Calendar.getInstance().getTime()); UUID uuid = UUID.randomUUID(); //全球唯一编码 saveFileName += "-" + uuid.toString(); HSSFWorkbook workbook = new HSSFWorkbook(); HSSFSheet sheet = workbook.createSheet(); workbook.setSheetName(0,"APP数据"); //设置表格工作簿名称 HSSFCellStyle cellStyle = workbook.createCellStyle(); cellStyle.setAlignment(CellStyle.ALIGN_CENTER); cellStyle.setVerticalAlignment(CellStyle.VERTICAL_CENTER); HSSFRow titleRow = sheet.createRow(0); sheet.addMergedRegion(new Region(0,(short)0,0,(short)(head.length-1))); HSSFCell titleCell = titleRow.createCell(0); titleCell.setCellValue("AAP数据____ "); titleCell.setCellStyle(cellStyle); HSSFRow row1 = sheet.createRow(1); //设置表头 for(int i = 0 ; i < head.length ; i++) { HSSFCell cell = row1.createCell(i); cell.setCellValue(head[i]); //设置值 cell.setCellStyle(cellStyle);//设置样式 } if(null != list && list.size() > 0) { int size = list.size(); Class classType = list.get(0).getClass(); for(int i = 0,rowNum=2 ; i < size ; i ++,rowNum++) { HSSFRow rows = sheet.createRow(rowNum); T t = list.get(i); //添加数据行 for(int j = 0 ; j < head.length ; j++) { //获得首字母 String firstLetter = head[j].substring(0,1).toUpperCase(); //获得get方法,getName,getAge等 String getMethodName = "get" + firstLetter + head[j].substring(1); Method method; try { //通过反射获得相应的get方法，用于获得相应的属性值 method = classType.getMethod(getMethodName, new Class[]{}); HSSFCell dataCell = rows.createCell(j); try { System.out.print(getMethodName +":" + method.invoke(t, new Class[]{}) +","); dataCell.setCellValue(method.invoke(t, new Class[]{}).toString()); } catch (IllegalArgumentException e) { e.printStackTrace(); } catch (IllegalAccessException e) { e.printStackTrace(); } catch (InvocationTargetException e) { e.printStackTrace(); } //设置值 dataCell.setCellStyle(cellStyle);//设置样式 } catch (SecurityException e) { e.printStackTrace(); } catch (NoSuchMethodException e) { e.printStackTrace(); } } System.out.println(); } } else { System.out.println("没有数据"); } //获得文件存储路径 //String fileDir = new GetFilePlace().getFileDirFromProperties(key); saveFileName += ".xls"; String saveFilePathAndName = fileDir + File.separator + saveFileName; OutputStream out = null; try { out = new FileOutputStream(saveFilePathAndName); try { workbook.write(out);//保存文件 } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } finally { try { out.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } return saveFilePathAndName; } /** * 提供外界调用的接口，生成以head为表头，list为数据的excel * @param head //数据表头 * @param list //数据 * @return //excel所在的路径 */ public <T> String generateExcel(String [] head,List<T> list) { final String FilePath = "filePath"; String saveFilePathAndName = ""; //获得存储的根目录 String savePath = new GetFilePlace().getFileDirFromProperties(FilePath); //获得当天存储的路径 String realSavePath = new GenerateFold().getFold(savePath); //生成excel并将存储的路径返回（包含文件名） saveFilePathAndName = generateExcels(realSavePath, head, list); return saveFilePathAndName; } public static void main(String[] args) { String [] head = {"name","sex","adress","height","age","jj"}; List<User> list = new ArrayList<User>(); User user1 = new User("zhangsan",1,1.1f,"北京","男","AA"); User user2 = new User("lisi",22222,3.2f,"上海","女","BB"); list.add(user1); list.add(user2); System.out.println(new GenerateExcel().generateExcel(head,list)); //System.out.println(new GenerateExcel().generateExcels("E:\\appData\\20151104",head,list)); }}