POI3.8组件研究（二）
??????????????? 在解析生成excel2003和2007时候，由于生成的对象不同可能需要创建workbook的不同对象。
判断代码如下：
/**
* 创建TableView类型的Excel文件
* @param excelVo excel模型
* @throws IOException
*/
public InputStream createTableViewerExcelStream(ExcelVO excelVo) throws IOException{
//创建一个EXCEL
Workbook wb =null;
//支持2007
if("xlsx".equals(excelVo.getPrefix())){
wb=new XSSFWorkbook();
//支持97 ~2003
}else{
wb=new HSSFWorkbook();
}
List<SheetVO> sheetList=excelVo.getSheets();
if(CollectionUtils.isNotEmpty(sheetList)){
for (int sheet = 0; sheet < sheetList.size(); sheet++) {
createExcelSheet(wb, sheetList, sheet);
}
}
//存储流信息
ByteArrayOutputStream out = new ByteArrayOutputStream();
wb.write(out);
//临时存储流信息
ByteArrayInputStream in = new ByteArrayInputStream(out.toByteArray());
out.close();
return in;
}
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创建一个sheet的内容如下：
/**
* 创建Excel的Sheet
* @param wb Excel的对象
* @param sheetList
* @param sheetNum
*/
private void createExcelSheet(Workbook wb, List<SheetVO> sheetList, int sheetNum) {
SheetVO sheetVo=sheetList.get(sheetNum);
//获取各种样式
//获取数据格式化对象
DataFormat dataformat = wb.createDataFormat();
//获取Sheet的名称
String sheetName=sheetVo.getSheetName();
//创建Sheet
Sheet sheet=wb.createSheet(sheetName);
// create 2 cell styles
CellStyle cs = wb.createCellStyle();
CellStyle cs2 = wb.createCellStyle();
DataFormat df = wb.createDataFormat();
// create 2 fonts objects
Font f = wb.createFont();
Font f2 = wb.createFont();
// Set font 1 to 12 point type, blue and bold
f.setFontHeightInPoints((short) 12);
f.setColor( IndexedColors.RED.getIndex() );
f.setBoldweight(Font.BOLDWEIGHT_BOLD);
// Set font 2 to 10 point type, red and bold
f2.setFontHeightInPoints((short) 10);
f2.setColor( IndexedColors.RED.getIndex() );
f2.setBoldweight(Font.BOLDWEIGHT_BOLD);
// Set cell style and formatting
cs.setFont(f);
cs.setDataFormat(df.getFormat("#,##0.0"));
// Set the other cell style and formatting
cs2.setBorderBottom(cs2.BORDER_THIN);
cs2.setDataFormat(df.getFormat("text"));
cs2.setFont(f2);
//获取开始写的行号
int rowNum=sheetVo.getRowNum();
//创建标题
Row headerRow = sheet.createRow(0);
headerRow.setHeightInPoints(40.0F);
Cell titleCell = headerRow.createCell(0);
titleCell.setCellValue(sheetVo.getTitle());
sheet.addMergedRegion(CellRangeAddress.valueOf("$A$1:$T$1"));
CreationHelper createHelper = wb.getCreationHelper();
String[] headerTitles=sheetVo.getHeaderTitle();
if(!ArrayUtils.isEmpty(headerTitles)){
//创建表头
Row row = sheet.createRow((short)rowNum);
for (int index=0; index < headerTitles.length; index++) {
//创建列信息
String headerTitle=headerTitles[index];
Cell cell = row.createCell(index);
cell.setCellValue(createHelper.createRichTextString(headerTitle));
//设置列宽，行高
sheet.setColumnWidth((short)index, 5000);
}
//行记录添加
rowNum++;
}
//编写shett的内容
List<Map<String,Object>> contentMap=sheetVo.getSheetContentMap();
if(CollectionUtils.isNotEmpty(contentMap)){
for (int index = 0; index < contentMap.size(); index++) {
Map<String,Object> rowMap=contentMap.get(index);
Row row = sheet.createRow((short)rowNum);
createCell(wb, dataformat, rowMap, row,sheetVo);
rowNum++;
}
}
}
/**
* 创建Excel的Cell
* @param wb
* @param dataformat
* @param rowMap
* @param row
*/
private void createCell(Workbook wb, DataFormat dataformat,
Map<String, Object> rowMap, Row row,SheetVO sheetVo) {
String[] headerTitles=sheetVo.getTitles();
if(MapUtils.isNotEmpty(rowMap)){
CreationHelper createHelper = wb.getCreationHelper();
for (int cellNum=0;cellNum<headerTitles.length;cellNum++) {
CellStyle style;
//创建列值
Cell cell = row.createCell(cellNum);
String key=headerTitles[cellNum];
Object cellValue=rowMap.get(key);
if(cellValue instanceof String){
cell.setCellValue(createHelper.createRichTextString((String)cellValue));
}else if((cellValue instanceof Integer)||(cellValue instanceof Long)){
cell.setCellValue(createHelper.createRichTextString(cellValue.toString()));
//针对带小数点的数据的处理
}else if((cellValue instanceof Double)||(cellValue instanceof Float)){
cell.setCellValue(Double.valueOf(cellValue.toString()));
style = wb.createCellStyle();
style.setDataFormat(dataformat.getFormat("#.##"));
//设定样式
cell.setCellStyle(style);
//针对Date格式
}else if(cellValue instanceof Date){
/*
* 定义显示日期的公共格式
* 如:yyyy-MM-dd hh:mm
* */
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
String newdate = sdf.format(new Date());
// 填充出产日期
cell.setCellValue(createHelper.createRichTextString(newdate));
}else if(cellValue instanceof Boolean){
cell.setCellValue((Boolean)cellValue);
}
}
}
}
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针对excel中的时间格式需要自动转换为数字：
针对POI支持的事件格式如下一种：
org.apache.poi.ss.usermodel.DateUtil:
private static final Pattern date_ptrn1 = Pattern.compile("^\\[\\$\\-.*?\\]");
private static final Pattern date_ptrn2 = Pattern.compile("^\\[[a-zA-Z]+\\]");
private static final Pattern date_ptrn3 = Pattern.compile("^[\\[\\]yYmMdDhHsS\\-/,. :\"\\\\]+0*[ampAMP/]*$");
private static final Pattern date_ptrn4 = Pattern.compile("^\\[([hH]+|[mM]+|[sS]+)\\]");
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将HH:MM和HH:MM:SS格式的转换数字的源代码如下：
org.apache.poi.ss.usermodel.DateUtil:
public static double convertTime(String timeStr)
{
try
{
return convertTimeInternal(timeStr);
} catch (FormatException e) {
String msg = "Bad time format '" + timeStr + "' expected 'HH:MM' or 'HH:MM:SS' - " + e.getMessage();
throw new IllegalArgumentException(msg); }
}
private static double convertTimeInternal(String timeStr) throws DateUtil.FormatException {
int len = timeStr.length();
if ((len < 4) || (len > 8)) {
throw new DateUtil.FormatException("Bad length");
}
String[] parts = TIME_SEPARATOR_PATTERN.split(timeStr);
String secStr;
switch (parts.length)
{
case 2:
secStr = "00"; break;
case 3:
secStr = parts[2]; break;
default:
throw new DateUtil.FormatException("Expected 2 or 3 fields but got (" + parts.length + ")");
}
String hourStr = parts[0];
String minStr = parts[1];
int hours = parseInt(hourStr, "hour", 24);
int minutes = parseInt(minStr, "minute", 60);
int seconds = parseInt(secStr, "second", 60);
double totalSeconds = seconds + (minutes + hours * 60) * 60;
return (totalSeconds / 86400.0D);
}
?针对YY-MM-dd时间格式的转换时间格式源代码：
public static Date parseYYYYMMDDDate(String dateStr)
{
try
{
return parseYYYYMMDDDateInternal(dateStr);
} catch (FormatException e) {
String msg = "Bad time format " + dateStr + " expected 'YYYY/MM/DD' - " + e.getMessage();
throw new IllegalArgumentException(msg); }
}
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注意：在读取excel时候需要解读HH:MM或者HH:MM:SS或者YYYY/MM/DD的转换，必须确定时间的格式，才可以转换。
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