excel 自定义列导出, excel导出

package com.cwl.utilty.excel; import java.io.OutputStream; import java.lang.reflect.Field; import java.text.SimpleDateFormat; import java.util.Date; import java.util.HashMap; import java.util.List; import java.util.Map; 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.HSSFRow; import org.apache.poi.hssf.usermodel.HSSFSheet; import org.apache.poi.hssf.usermodel.HSSFWorkbook; import com.rstj.util.excel.ExcelHeader; public class SimpleExportToExcelUtilty { public static void exportExcel(String title, List<Map<String, Object>> lstMap, OutputStream outputStream, ExcelHeader... headers) throws Exception { // 声明一个工作薄 HSSFWorkbook wb = new HSSFWorkbook(); HSSFSheet sheet = wb.createSheet(title); HSSFCellStyle style = wb.createCellStyle(); style.setAlignment(HSSFCellStyle.ALIGN_CENTER); HSSFFont font = wb.createFont(); font.setFontName("微软雅黑"); font.setFontHeightInPoints((short) 16);// 设置字体大小 // 把字体应用到当前的样式 style.setFont(font); // dataIndex标识位Map Map<String, Object> mapDataIndex = new HashMap<String, Object>(); // 产生表格标题行 HSSFRow row = sheet.createRow(0); HSSFCell cell; for (int i = 0; i < headers.length; i++) { cell = row.createCell(i); cell.setCellStyle(style); cell.setCellValue(headers[i].getText().toString()); mapDataIndex.put(headers[i].getDataIndex(), i); mapDataIndex.put("s$" + headers[i].getDataIndex(), headers[i] .getExcelFieldStrategy()); } // 生成数据 for (int j = 0; j < lstMap.size(); j++) { row = sheet.createRow(j + 1); for (String mapKey : lstMap.get(j).keySet()) { if (mapDataIndex.get(mapKey) == null) { continue; } cell = row.createCell(new Integer(mapDataIndex.get(mapKey) .toString())); ExcelFieldStrategyInterface excelFieldStrategy = mapDataIndex .get("s$" + mapKey) == null ? null : (ExcelFieldStrategyInterface) mapDataIndex.get("s$" + mapKey); Object obj = lstMap.get(j).get(mapKey); if (obj == null) { obj = ""; } String value = null; if (excelFieldStrategy != null) { cell.setCellValue((String) excelFieldStrategy .operateField(obj)); } else if (obj instanceof Date) { Date date = (Date) obj; SimpleDateFormat sdf = new SimpleDateFormat(headers[cell .getColumnIndex()].getYyMMdd()); value = sdf.format(date); cell.setCellValue(value); } else if (obj instanceof Integer) { int val = ((Integer) obj).intValue(); cell.setCellValue(val); } else if (obj instanceof Double) { double val = (Double) obj; cell.setCellValue(val); } else { cell.setCellValue(obj.toString()); } } } wb.write(outputStream); } public static void exportExcelForList(String title, List<?> lst, OutputStream outputStream, ExcelHeader... headers) throws Exception { HSSFWorkbook wb = new HSSFWorkbook(); HSSFSheet sheet = wb.createSheet(title); HSSFCellStyle style = wb.createCellStyle(); style.setAlignment(HSSFCellStyle.ALIGN_CENTER); HSSFFont font = wb.createFont(); font.setFontName("微软雅黑"); font.setFontHeightInPoints((short) 16);// 设置字体大小 // 把字体应用到当前的样式 style.setFont(font); // dataIndex标识位Map Map<String, Object> mapDataIndex = new HashMap<String, Object>(); // 产生表格标题行 HSSFRow row = sheet.createRow(0); HSSFCell cell; for (int i = 0; i < headers.length; i++) { sheet.setColumnWidth(i, headers[i].getText().length() * 2400); cell = row.createCell(i); cell.setCellStyle(style); cell.setCellValue(headers[i].getText().toString()); mapDataIndex.put(headers[i].getDataIndex(), i); mapDataIndex.put("s$" + headers[i].getDataIndex(), headers[i] .getExcelFieldStrategy()); } // 填充数据 for (int i = 0; i < lst.size(); i++) { row = sheet.createRow(i + 1); Class<? extends Object> t = (Class<? extends Object>) lst.get(i) .getClass(); Field[] fields = t.getDeclaredFields(); for (Field field : fields) { String fieldName = field.getName(); if (mapDataIndex.get(fieldName) == null) { continue; } Object obj = MethodUtil.doFiledGetMehod(lst.get(i), fieldName); if (obj == null) { obj = ""; } cell = row.createCell(new Integer(mapDataIndex.get(fieldName) .toString())); ExcelFieldStrategyInterface excelFieldStrategy = mapDataIndex .get("s$" + fieldName) == null ? null : (ExcelFieldStrategyInterface) mapDataIndex.get("s$" + fieldName); String value = null; if (excelFieldStrategy != null) { cell.setCellValue((String) excelFieldStrategy .operateField(obj)); } else if (obj instanceof Date) { Date date = (Date) obj; SimpleDateFormat sdf = new SimpleDateFormat(headers[cell .getColumnIndex()].getYyMMdd()); value = sdf.format(date); cell.setCellValue(value); } else if (obj instanceof Integer) { int val = ((Integer) obj).intValue(); cell.setCellValue(val); } else if (obj instanceof Double) { double val = (Double) obj; cell.setCellValue(val); } else { cell.setCellValue(obj.toString()); } } } wb.write(outputStream); } }