java页面表格导出为Excel实现代码,Java代码库,德仔网

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【Java】 java页面表格导出为Excel实现
作者: / 发布于2018/6/26/ 451
import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.HashMap;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.poi.hssf.usermodel.HSSFCell;
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 org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.Workbook;
import org.springframework.util.StringUtils;
 
public class Export {
public static void setFileDownloadHeader(HttpServletRequest request, HttpServletResponse response, String fileName) {
final String userAgent = request.getHeader("USER-AGENT");
try {
String finalFileName = null;
if (StringUtils.countOccurrencesOf(userAgent, "MSIE") > 0) {// IE浏览器
// MSIE
finalFileName = URLEncoder.encode(fileName, "UTF8");
} else if (StringUtils.countOccurrencesOf(userAgent, "Mozilla") > 0) {// google,火狐浏览器
// Mozilla
finalFileName = new String(fileName.getBytes(), "ISO8859-1");
} else {
finalFileName = URLEncoder.encode(fileName, "UTF8");// 其他浏览器
}
response.setHeader("Content-Disposition", "attachment; filename=\"" + finalFileName + "\"");// 这里设置一下让浏览器弹出下载提示框，而不是直接在浏览器中打开
} catch (UnsupportedEncodingException e) {
}
}
 
/**
 * 导出到excel 
 *
 * @Title: exportExcel 
 * @param list
 * @param fieldName
 * @param columnIt
 * @param sheetName
 * @param sheetSize
 * @param output
 * @return boolean
 */
@SuppressWarnings({ "rawtypes" })
public static boolean exportExcel(List list, String[] fieldName, Object[] columnIt, String sheetName, Integer sheetSize, OutputStream output) {
// 产生工作薄对象
HSSFWorkbook workbook = new HSSFWorkbook();
if (sheetSize >= 65536) {
sheetSize = 65536;
}
double sheetNo = Math.ceil(list.size() / sheetSize);// 计算需要几个sheet
for (int index = 0; index < sheetNo; index++) {
// 产生工作表对象
HSSFSheet sheet = workbook.createSheet();
// 设置工作表的名称.
workbook.setSheetName(index, sheetName + (index + 1));
// 产生一行
HSSFRow row = sheet.createRow(0);
// 产生单元格
HSSFCell cell;
 
CellStyle cellStyle = getTitleStyle(workbook);
// 写入各个字段的名称
for (int i = 0; i < fieldName.length; i++) {
// 创建第一行各个字段名称的单元格
cell = row.createCell(i);
// 设置单元格内容为字符串型
cell.setCellType(HSSFCell.CELL_TYPE_STRING);
cell.setCellStyle(cellStyle);
// 给单元格内容赋值
cell.setCellValue(fieldName[i]);
}
 
int startNo = index * sheetSize;
int endNo = Math.min(startNo + sheetSize, list.size());
// 写入各条记录,每条记录对应excel表中的一行
for (int i = startNo; i < endNo; i++) {
row = sheet.createRow(i + 1 - startNo);
HashMap map = (HashMap) list.get(i);
for (int j = 0; j < columnIt.length; j++) {
cell = row.createCell(j);
cell.setCellType(HSSFCell.CELL_TYPE_STRING);
Object value = map.get(columnIt[j]);
if (value != null) {
cell.setCellValue(map.get(columnIt[j]).toString());
} else
cell.setCellValue("");
}
}
}
try {
workbook.write(output);
output.flush();
output.close();
return true;
} catch (IOException e) {
e.printStackTrace();
return false;
}
}
 
/**
 * 标题单元格样式 
 *
 * @Title: getTitleStyle 
 * @param workbook
 * @return CellStyle
 */
public static CellStyle getTitleStyle(Workbook workbook) {
CellStyle titleStyel = workbook.createCellStyle();
HSSFFont font = (HSSFFont) workbook.createFont();
font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);// 设置粗体
titleStyel.setFont(font);
return titleStyel;
}
}


下面是如何调用上面的工具类

String[] fieldName = new String[]{"主体名称", "主体标识码","状态","失败原因"};
String[] columnIt = new String[]{"principalName", "code","statues","failReason"};
try {
response.setContentType("text/html; charset=utf-8");
response.setContentType("application/octet-stream");
response.addHeader("Content-Disposition", "attachment;filename=" + new String("导出数据.xls".getBytes("GB2312"), "ISO-8859-1"));
Export.exportExcel(result, fieldName, columnIt, "数据", result.size(), response.getOutputStream());
} catch (Exception e) {
e.printStackTrace();
} 

注：这里的result格式为List<Map<String, Object>>
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