Java excel 报表导出，spring注解动态注入列
作为日常记录，Excel导出后台操作，作为最普通一种方式，直接上代码：
1.定义Excel列字段
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
/**
* excel字段标记
*/
@Target(ElementType.FIELD)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface ExcelCell {
/**
* 该字段对应的表头
*/
String title() default "";
/**
* 该字段单元格宽度
*/
int width() default 20;
/**
* long属性是否转换为date
*/
boolean isDate() default false;
}
2.bean类定义
用于业务数据封装，导出字段加上@ExcelCell 注解。
3.后台逻辑代码
/**
* 创建带标题的excel自定义表头名称
* @param output 输出
* @param sheetName excelsheet名称
* @param title 标题
* @param dates 数据
* @param titleList 表头
* @throws Exception
*/
public static void getExcel(OutputStream output, String sheetName, String title, List dates, List
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet(sheetName);
CreationHelper createHelper = wb.getCreationHelper();
CellStyle cellStyle = wb.createCellStyle(); //内容单元格样式
cellStyle.setAlignment(CellStyle.ALIGN_CENTER);
cellStyle.setVerticalAlignment(CellStyle.VERTICAL_CENTER);
cellStyle.setBorderBottom(CellStyle.BORDER_THIN);
cellStyle.setBottomBorderColor(IndexedColors.BLACK.getIndex());
cellStyle.setBorderLeft(CellStyle.BORDER_THIN);
cellStyle.setLeftBorderColor(IndexedColors.BLACK.getIndex());
cellStyle.setBorderRight(CellStyle.BORDER_THIN);
cellStyle.setRightBorderColor(IndexedColors.BLACK.getIndex());
cellStyle.setBorderTop(CellStyle.BORDER_THIN);
cellStyle.setTopBorderColor(IndexedColors.BLACK.getIndex());
CellStyle cellStyleWithDate = wb.createCellStyle(); //内容单元格样式
cellStyleWithDate.setAlignment(CellStyle.ALIGN_CENTER);
cellStyleWithDate.setVerticalAlignment(CellStyle.VERTICAL_CENTER);
cellStyleWithDate.setBorderBottom(CellStyle.BORDER_THIN);
cellStyleWithDate.setBottomBorderColor(IndexedColors.BLACK.getIndex());
cellStyleWithDate.setBorderLeft(CellStyle.BORDER_THIN);
cellStyleWithDate.setLeftBorderColor(IndexedColors.BLACK.getIndex());
cellStyleWithDate.setBorderRight(CellStyle.BORDER_THIN);
cellStyleWithDate.setRightBorderColor(IndexedColors.BLACK.getIndex());
cellStyleWithDate.setBorderTop(CellStyle.BORDER_THIN);
cellStyleWithDate.setTopBorderColor(IndexedColors.BLACK.getIndex());
cellStyleWithDate.setDataFormat(createHelper.createDataFormat().getFormat("yyyy/mm/dd hh:mm:ss"));
CellStyle cellStyleHead = wb.createCellStyle(); //表头单元格样式
cellStyleHead.setAlignment(CellStyle.ALIGN_CENTER);
cellStyleHead.setVerticalAlignment(CellStyle.VERTICAL_CENTER);
cellStyleHead.setBorderBottom(CellStyle.BORDER_DOUBLE);
cellStyleHead.setBottomBorderColor(IndexedColors.BLACK.getIndex()); //设置表头下边框为双线
cellStyleHead.setBorderLeft(CellStyle.BORDER_THIN);
cellStyleHead.setLeftBorderColor(IndexedColors.BLACK.getIndex());
cellStyleHead.setBorderRight(CellStyle.BORDER_THIN);
cellStyleHead.setRightBorderColor(IndexedColors.BLACK.getIndex());
cellStyleHead.setBorderTop(CellStyle.BORDER_THIN);
cellStyleHead.setTopBorderColor(IndexedColors.BLACK.getIndex());
cellStyleHead.setFillForegroundColor(IndexedColors.GREY_25_PERCENT.getIndex()); //设置表头颜色为25%灰色
cellStyleHead.setFillPattern(CellStyle.SOLID_FOREGROUND);
CellStyle cellStyleTitle = wb.createCellStyle(); //标题单元格样式
cellStyleTitle.setAlignment(CellStyle.ALIGN_CENTER);
cellStyleTitle.setVerticalAlignment(CellStyle.VERTICAL_CENTER);
cellStyleTitle.setBorderBottom(CellStyle.BORDER_THIN);
cellStyleTitle.setBottomBorderColor(IndexedColors.BLACK.getIndex());
cellStyleTitle.setBorderLeft(CellStyle.BORDER_THIN);
cellStyleTitle.setLeftBorderColor(IndexedColors.BLACK.getIndex());
cellStyleTitle.setBorderRight(CellStyle.BORDER_THIN);
cellStyleTitle.setRightBorderColor(IndexedColors.BLACK.getIndex());
cellStyleTitle.setBorderTop(CellStyle.BORDER_THIN);
cellStyleTitle.setTopBorderColor(IndexedColors.BLACK.getIndex());
Font font = wb.createFont(); //设置标题字体样式
font.setFontHeightInPoints((short)13); //设置字体为13像素
cellStyleTitle.setFont(font);
HSSFRow row = sheet.createRow((short) 0);
/**
* 首先设置表头行，根据表头行可以得出总共的列数x
* 然后根据x可以设置标题行合并单元格的其实位置
*/
//设置表头行
row = sheet.createRow((short) 1);
row.setHeightInPoints(30); //设置表头高度30
int x = 0;
HSSFCell cell = row.createCell(0); //设置表格第一列为序号
cell.setCellStyle(cellStyleHead);
cell.setCellValue("序号");
sheet.setColumnWidth(x, 10 * 256);
x++;
Field[] fields = dates.get(0).getClass().getDeclaredFields();
int j = 0;
for(Field field : fields) { //遍历有ExcelCell注解的属性，并根据注解参数设置表头值和列的宽度
ExcelCell excelCell = (ExcelCell)field.getAnnotation(ExcelCell.class);
if(null != excelCell) {
HSSFCell cellHead = row.createCell(x);
cellHead.setCellStyle(cellStyleHead);
cellHead.setCellValue(titleList.get(j));
j++;
sheet.setColumnWidth(x, 256 * excelCell.width());
x++;
}
}
//设置标题行
row = sheet.createRow((short) 0);
row.setHeightInPoints(30); //设置标题高度30
HSSFCell titleCell = row.createCell(0); //设置标题单元格
titleCell.setCellValue(title);
titleCell.setCellStyle(cellStyleTitle);
sheet.addMergedRegion(new CellRangeAddress(0,0,0,x-1)); //合并标题单元格
//设置数据内容单元格
for (int i = 0; i < dates.size(); i++) { //循环数据list
row = sheet.createRow((short) 2 + i); //创建一个行
row.setHeightInPoints(20); //设置内容高度为20
Object object = dates.get(i);
HSSFCell xh = row.createCell(0); //每行的第一个单元格为序号
xh.setCellStyle(cellStyle);
xh.setCellValue(i+1);
int n = 1;
for (Field field : object.getClass().getDeclaredFields()) { //根据反射取得由ExcelCell注解的属性并创建单元格
ExcelCell excelCell = (ExcelCell)field.getAnnotation(ExcelCell.class);
if(null != excelCell) {
field.setAccessible(true);
HSSFCell data = row.createCell(n);
if(excelCell.isDate()) {
if(null != field.get(object)) {
Date date = new Date(Long.parseLong(field.get(object).toString()));
data.setCellValue(date);
data.setCellStyle(cellStyleWithDate);
} else {
data.setCellValue("");
data.setCellStyle(cellStyleWithDate);
}
} else {
if(field.get(object)!=null)
data.setCellValue(field.get(object).toString());
data.setCellStyle(cellStyle);
}
field.setAccessible(false);
n++;
}
}
}
try {
output.flush();
wb.write(output);
} catch (IOException e) {
log.error(e.getMessage(), e);
}
}