Java Excel 表格 导入、导出 工具类
工具类
/**
* 表格 导入、导出 工具类
*
*/
public class FileUtil {
public static final String XLSX = "xlsx";
public static final String XLS = "xls";
/**
* 得到表格中数据
*
* @return list
*/
public static List> getExcelData(CommonsMultipartFile file, String[] title) {
List> list = new ArrayList<>();
String filename = file.getOriginalFilename();
try {
InputStream is = file.getInputStream();
if (getFileSuffix(filename).equals(XLS)) {
// xls 文件
HSSFWorkbook wb = new HSSFWorkbook(is);
HSSFSheet sheet = wb.getSheetAt(0);
for (int i = 1; i < sheet.getLastRowNum() + 1; i++) {
HSSFRow row = sheet.getRow(i);
if (row == null) {
//如果行为空则跳出
continue;
}
Map map = new HashMap<>(title.length);
for (int j = 0; j < row.getLastCellNum(); j++) {
HSSFCell cell = row.getCell(j);
Object value = getHssfCell(cell);
if (value != null) {
map.put(title[j], value);
}
}
list.add(map);
}
} else if (getFileSuffix(filename).equals(XLSX)) {
// xlsx 文件
XSSFWorkbook exc = new XSSFWorkbook(is);
XSSFSheet sheet = exc.getSheetAt(0);
for (int i = 1; i < sheet.getLastRowNum() + 1; i++) {
XSSFRow row = sheet.getRow(i);
if (row == null) {
//如果行为空则跳出
continue;
}
Map map = new HashMap<>(title.length);
for (int j = 0; j < row.getLastCellNum(); j++) {
XSSFCell cell = row.getCell(j);
Object value = getXssfCell(cell);
if (value != null) {
map.put(title[j], value);
}
}
list.add(map);
}
}
is.close();
} catch (IOException e) {
e.printStackTrace();
}
return list;
}
/**
* 返回单元格数据
*
* @param cell 表格单元格
* @return 单元格值
*/
private static Object getHssfCell(HSSFCell cell) {
if (cell == null) {
return null;
}
Object value = null;
switch (cell.getCellType()) {
case HSSFCell.CELL_TYPE_NUMERIC:
// 数字
if (HSSFDateUtil.isCellDateFormatted(cell)) {
value = cell.getDateCellValue();
} else {
value = cell.getNumericCellValue();
}
break;
case HSSFCell.CELL_TYPE_STRING:
// 字符串
value = cell.getStringCellValue();
break;
case HSSFCell.CELL_TYPE_BOOLEAN:
// 布尔类型
value = cell.getBooleanCellValue();
break;
default:
break;
}
return value;
}
/**
* @param cell xlsx
* @return 单元格值
*/
private static Object getXssfCell(XSSFCell cell) {
if (cell == null) {
return null;
}
Object val = null;
switch (cell.getCellType()) {
case HSSFCell.CELL_TYPE_NUMERIC:
// 数字
if (HSSFDateUtil.isCellDateFormatted(cell)) {
val = cell.getDateCellValue();
} else {
val = cell.getNumericCellValue();
}
break;
case HSSFCell.CELL_TYPE_STRING:
// 字符串
val = cell.getStringCellValue();
break;
case HSSFCell.CELL_TYPE_BOOLEAN:
// 布尔类型
val = cell.getBooleanCellValue();
break;
default:
break;
}
return val;
}
/**
* @param resp HttpServletResponse
* @param strName excel表格头部中文名称
* @param data 写入的数据
* @param mapKey 写入数据对应的实体名称
* @param filename 导出的文件名称
*/
public static void excelTemplate(HttpServletResponse resp, String[] strName, List> data, String[] mapKey, String filename) {
XSSFWorkbook wb = new XSSFWorkbook();
// 创建excel 头
XSSFSheet sheet = wb.createSheet();
CellStyle headStyle = headStyle(wb);
CellStyle cellStyle = cellStyle(wb);
// 设置第一行头标题
setSheet(sheet, strName, headStyle);
// 填充单元格数据
setCallData(data, sheet, mapKey, cellStyle);
try {
resp.reset();
resp.setContentType("application/vnd.ms-excel;charset=UTF-8");
resp.setHeader("Content-disposition", "attachment;filename=" + URLEncoder.encode(filename, "UTF-8"));
OutputStream out = resp.getOutputStream();
wb.write(out);
out.close();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* @param sheet sheet
* @param strName 头中文名称
*/
private static void setSheet(XSSFSheet sheet, String[] strName, CellStyle headStyle) {
// 创建行
XSSFRow row = sheet.createRow(0);
// 设置头标题
for (int i = 0; i < strName.length; i++) {
// 创建列
XSSFCell cell = row.createCell(i);
cell.setCellStyle(headStyle);
// 设置单元格类型为String
cell.setCellType(XSSFCell.CELL_TYPE_STRING);
cell.setCellValue(strName[i]);
}
}
/**
* @param data 数据
* @param sheet sheet
* @param mapKey map数据的key值
*/
private static void setCallData(List> data, XSSFSheet sheet, String[] mapKey, CellStyle cellStyle) {
// 添加数据
for (int i = 0; i < data.size(); i++) {
// 创建行
XSSFRow row = sheet.createRow(i + 1);
for (int j = 0; j < data.get(i).size(); j++) {
// 创建单元格
XSSFCell cell = row.createCell(j);
cell.setCellStyle(cellStyle);
// 设置类型为字符串
cell.setCellType(XSSFCell.CELL_TYPE_STRING);
cell.setCellValue(data.get(i).get(mapKey[j]));
}
}
}
/**
* @param wb XSSFWorkbook
* @return 表头样式
*/
private static CellStyle headStyle(XSSFWorkbook wb) {
// 创建样式
CellStyle style = wb.createCellStyle();
// 创建字体
XSSFFont font = wb.createFont();
font.setFontName("微软雅黑");
font.setBold(true);
font.setColor(Font.COLOR_RED);
// 设置单元格样式 居中
style.setAlignment(XSSFCellStyle.ALIGN_CENTER);
style.setFont(font);
return style;
}
/**
* @param wb XSSFWorkbook
* @return 单元格样式
*/
private static CellStyle cellStyle(XSSFWorkbook wb) {
// 创建样式
CellStyle style = wb.createCellStyle();
// 创建字体
XSSFFont font = wb.createFont();
font.setFontName("微软雅黑");
// 设置单元格样式 居中
style.setAlignment(XSSFCellStyle.ALIGN_CENTER);
style.setFont(font);
return style;
}
/**
* @param fileName 文件名称
* @return 返回文件后缀
*/
public static String getFileSuffix(String fileName) {
return fileName.substring(fileName.lastIndexOf(".") + 1);
}
}
测试
@RequestMapping("/upload")
public BaseResult uploadExcel(PageForm form) {
CommonsMultipartFile file = form.getFile();
String[] title = {"name", "age", "sex", "class"};
List> list = FileUtil.getExcelData(file, title);
BaseResult rs = new BaseResult();
rs.setData(list);
return rs;
}
@RequestMapping("/downExcel")
public void download(HttpServletResponse resp){
String filename= "导出excel测试."+FileUtil.XLSX;
String[] strName = {"姓名", "年龄"};
String[] mapKey = {"name", "age"};
List> data = new ArrayList<>();
for (int i = 0; i < 10; i++) {
Map map = new HashMap<>();
map.put("name", "张三" + i);
map.put("age", "10" + i);
data.add(map);
}
FileUtil.excelTemplate(resp,strName,data,mapKey,filename);
}