生成ExcelUtil
//调用方法
/*
- String ExcelName Excel文件名称
- String sheetName Sheet页名称
- String[] heads 生成excel表头
- String[] titles 表头对应实体属性
*List
*/
writerExcel(ExcelName,sheetName,heads,titles,resList);
//生成ExcelUtil方法
/**
* 数据写入Excel文件
*
* @param path 文件路径，包含文件全名，例如：D://file//demo.xls
* @param name sheet名称
* @param titles 行标题列
* @param values 数据集合，key为标题，value为数据
* @return True\False
*/
public static BigDecimal writerExcel(String path, String name,String[] excelHead, List titles, List> values) {
System.out.println("path : {}"+ path);
String style = path.substring(path.lastIndexOf("."), path.length()).toUpperCase(); // 从文件路径中获取文件的类型
return generateWorkbook(path, name, style,excelHead, titles, values);
}
/**
* 将数据写入指定path下的Excel文件中
*
* @param path 文件存储路径
* @param name sheet名
* @param style Excel类型
* @param titles 标题串
* @param values 内容集
* @return True\False
*/
private static BigDecimal generateWorkbook(String path, String name, String style, String[] excelHead, List titles, List> values) {
System.out.println("file style : {}"+ style);
BigDecimal dataLen = new BigDecimal("0");
Workbook workbook;
if (".XLS".equals(style.toUpperCase())) {
workbook = new HSSFWorkbook();
} else {
//提供了一种基于XSSF的低内存占用的SXSSF方式
workbook = new SXSSFWorkbook();
}
// 生成一个表格
Sheet sheet;
if (null == name || "".equals(name)) {
sheet = workbook.createSheet(); // name 为空则使用默认值
} else {
sheet = workbook.createSheet(name);
}
// 设置表格默认列宽度为15个字节
sheet.setDefaultColumnWidth((short) 15);
// 生成样式
Map styles = createStyles(workbook);
/*
* 创建标题行
*/
Row row = sheet.createRow(0);
// 存储标题在Excel文件中的序号
Map titleOrder = Maps.newHashMap();
for (int i = 0; i < titles.size(); i++) {
Cell cell = row.createCell(i);
cell.setCellStyle(styles.get("header"));
String title = titles.get(i);
cell.setCellValue(excelHead[i]);
titleOrder.put(title, i);
}
/*
* 写入正文
*/
Iterator> iterator = values.iterator();
int index = 0; // 行号
while (iterator.hasNext()) {
index++; // 出去标题行，从第一行开始写
row = sheet.createRow(index);
row.setHeightInPoints((short) 30);
Map value = iterator.next();
for (Map.Entry map : value.entrySet()) {
// 获取列名
String title = map.getKey();
// 根据列名获取序号
if(titleOrder.get(title)==null){
continue;
}
int i = titleOrder.get(title);
// 在指定序号处创建cell
Cell cell = row.createCell(i);
// 设置cell的样式
if (index % 2 == 1) {
cell.setCellStyle(styles.get("cellA"));
} else {
cell.setCellStyle(styles.get("cellB"));
}
// 获取列的值
Object object = map.getValue();
// 判断object的类型
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
if (object instanceof Double) {
cell.setCellValue((Double) object);
} else if (object instanceof Date) {
String time = simpleDateFormat.format((Date) object);
cell.setCellValue(time);
} else if (object instanceof Calendar) {
Calendar calendar = (Calendar) object;
String time = simpleDateFormat.format(calendar.getTime());
cell.setCellValue(time);
} else if (object instanceof Boolean) {
cell.setCellValue((Boolean) object);
} else {
cell.setCellValue(object==null?"-":object.toString());
}
}
}
/*
* 写入到文件中
*/
boolean isCorrect = false;
try {
File file = new File(path);
OutputStream outputStream = new FileOutputStream(file);
workbook.write(outputStream);
dataLen = new BigDecimal(file.length()).divide(new BigDecimal("1024"),2, RoundingMode.HALF_UP);
outputStream.close();
isCorrect = true;
} catch (IOException e) {
isCorrect = false;
System.out.println("write Excel file error : {}"+ e.getMessage());
}
try {
workbook.close();
} catch (IOException e) {
isCorrect = false;
System.out.println("workbook closed error : {}"+ e.getMessage());
}
return dataLen;
}
/**
* Create a library of cell styles
*/
/**
* @param wb
* @return
*/
private static Map createStyles(Workbook wb) {
Map styles = Maps.newHashMap();
// 标题样式
CellStyle titleStyle = wb.createCellStyle();
titleStyle.setAlignment(HorizontalAlignment.CENTER); // 水平对齐
titleStyle.setVerticalAlignment(VerticalAlignment.CENTER); // 垂直对齐
titleStyle.setLocked(true); // 样式锁定
titleStyle.setFillForegroundColor(IndexedColors.LIGHT_YELLOW.getIndex());
Font titleFont = wb.createFont();
titleFont.setFontHeightInPoints((short) 16);
titleFont.setBold(true);
titleFont.setFontName("微软雅黑");
titleStyle.setFont(titleFont);
styles.put("title", titleStyle);
// 文件头样式
CellStyle headerStyle = wb.createCellStyle();
headerStyle.setAlignment(HorizontalAlignment.CENTER);
headerStyle.setVerticalAlignment(VerticalAlignment.CENTER);
headerStyle.setFillForegroundColor(IndexedColors.LIGHT_BLUE.getIndex()); // 前景色
headerStyle.setFillPattern(FillPatternType.SOLID_FOREGROUND); // 颜色填充方式
headerStyle.setWrapText(true);
headerStyle.setBorderRight(BorderStyle.THIN); // 设置边界
headerStyle.setRightBorderColor(IndexedColors.BLACK.getIndex());
headerStyle.setBorderLeft(BorderStyle.THIN);
headerStyle.setLeftBorderColor(IndexedColors.BLACK.getIndex());
headerStyle.setBorderTop(BorderStyle.THIN);
headerStyle.setTopBorderColor(IndexedColors.BLACK.getIndex());
headerStyle.setBorderBottom(BorderStyle.THIN);
headerStyle.setBottomBorderColor(IndexedColors.BLACK.getIndex());
Font headerFont = wb.createFont();
headerFont.setFontHeightInPoints((short) 12);
headerFont.setColor(IndexedColors.WHITE.getIndex());
titleFont.setFontName("微软雅黑");
headerStyle.setFont(headerFont);
styles.put("header", headerStyle);
Font cellStyleFont = wb.createFont();
cellStyleFont.setFontHeightInPoints((short) 12);
cellStyleFont.setColor(IndexedColors.BLUE_GREY.getIndex());
cellStyleFont.setFontName("微软雅黑");
// 正文样式A
CellStyle cellStyleA = wb.createCellStyle();
cellStyleA.setAlignment(HorizontalAlignment.CENTER); // 居中设置
cellStyleA.setVerticalAlignment(VerticalAlignment.CENTER);
cellStyleA.setWrapText(true);
cellStyleA.setBorderRight(BorderStyle.THIN);
cellStyleA.setRightBorderColor(IndexedColors.BLACK.getIndex());
cellStyleA.setBorderLeft(BorderStyle.THIN);
cellStyleA.setLeftBorderColor(IndexedColors.BLACK.getIndex());
cellStyleA.setBorderTop(BorderStyle.THIN);
cellStyleA.setTopBorderColor(IndexedColors.BLACK.getIndex());
cellStyleA.setBorderBottom(BorderStyle.THIN);
cellStyleA.setBottomBorderColor(IndexedColors.BLACK.getIndex());
cellStyleA.setFont(cellStyleFont);
styles.put("cellA", cellStyleA);
// 正文样式B:添加前景色为浅黄色
CellStyle cellStyleB = wb.createCellStyle();
cellStyleB.setAlignment(HorizontalAlignment.CENTER);
cellStyleB.setVerticalAlignment(VerticalAlignment.CENTER);
cellStyleB.setFillForegroundColor(IndexedColors.LIGHT_YELLOW.getIndex());
cellStyleB.setFillPattern(FillPatternType.SOLID_FOREGROUND);
cellStyleB.setWrapText(true);
cellStyleB.setBorderRight(BorderStyle.THIN);
cellStyleB.setRightBorderColor(IndexedColors.BLACK.getIndex());
cellStyleB.setBorderLeft(BorderStyle.THIN);
cellStyleB.setLeftBorderColor(IndexedColors.BLACK.getIndex());
cellStyleB.setBorderTop(BorderStyle.THIN);
cellStyleB.setTopBorderColor(IndexedColors.BLACK.getIndex());
cellStyleB.setBorderBottom(BorderStyle.THIN);
cellStyleB.setBottomBorderColor(IndexedColors.BLACK.getIndex());
cellStyleB.setFont(cellStyleFont);
styles.put("cellB", cellStyleB);
return styles;
}