java excel导出工具类
使用的是apache poi与注解类实现：
maven:
org.apache.poi
poi
3.14
org.apache.poi
poi-ooxml
3.14
1.注解类，将JAVA对象与excel标题对应
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
/**
*
* @Description: excel导出注解类
* @author kang
* @date 2016年8月24日
*/
@Target({ ElementType.METHOD, ElementType.FIELD, ElementType.TYPE })
@Retention(RetentionPolicy.RUNTIME)
public @interface ExcelField
{
//导出字段在excel中的名字
String title();
}
2.工具类：
import java.io.IOException;
import java.io.OutputStream;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.List;
import javax.servlet.http.HttpServletResponse;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFCellStyle;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
/**
*
* @Description: excel导出封装类
* @author kang
* @date 2016年8月24日
*/
public class ExcelUtil {
// 生成excel，list导出的数据，list里的实体class，sumData合计数据
public static XSSFWorkbook createExcel(List list, Class cls, Q sumData) throws IOException, IllegalArgumentException, IllegalAccessException {
XSSFWorkbook wb = new XSSFWorkbook(); Field[] fields = cls.getDeclaredFields();
ArrayList headList = new ArrayList();
// 添加合计数据
if (sumData != null) {
list.add(sumData);
}
for (Field f : fields) {
ExcelField field = f.getAnnotation(ExcelField.class);
if (field != null) {
headList.add(field.title());
}
}
XSSFCellStyle style = getCellStyle(wb);
XSSFSheet sheet = wb.createSheet();
// 设置Excel表的第一行即表头
XSSFRow row = sheet.createRow(0);
for (int i = 0; i < headList.size(); i++) {
XSSFCell headCell = row.createCell(i);
headCell.setCellType(Cell.CELL_TYPE_STRING);
headCell.setCellStyle(style);// 设置表头样式
headCell.setCellValue(String.valueOf(headList.get(i)));
// sheet.autoSizeColumn((short) i);// 设置单元格自适应
sheet.setColumnWidth(0, 15 * 256);
}
for (int i = 0; i < list.size(); i++) {
XSSFRow rowdata = sheet.createRow(i + 1);// 创建数据行
Q q = list.get(i);
Field[] ff = q.getClass().getDeclaredFields();
int j = 0;
for (Field f : ff) {
ExcelField field = f.getAnnotation(ExcelField.class);
if (field == null) {
continue;
}
f.setAccessible(true);
Object obj = f.get(q);
XSSFCell cell = rowdata.createCell(j);
cell.setCellType(Cell.CELL_TYPE_STRING);
// 当数字时
if (obj instanceof Integer) {
cell.setCellValue((Integer)obj);
// 将序号替换为123456
if (j == 0)
cell.setCellValue(i + 1);
}
// 当为字符串时
else if (obj instanceof String)
cell.setCellValue((String)obj);
// 当为布尔时
else if (obj instanceof Boolean)
cell.setCellValue((Boolean)obj);
// 当为时间时
else if (obj instanceof Date)
cell.setCellValue((String)obj);
// 当为时间时
else if (obj instanceof Calendar)
cell.setCellValue((Calendar)obj);
// 当为小数时
else if (obj instanceof Double)
cell.setCellValue((Double)obj);
j++;
}
}
if (sumData != null) {
int rowIndex = list.size();
XSSFRow sumRow = sheet.getRow(rowIndex);
XSSFCell sumCell = sumRow.getCell(0);
sumCell.setCellStyle(style);
sumCell.setCellValue("合计");
}
return wb;
}
// 导出
public static void writeExcel(HttpServletResponse response, String fileName, XSSFWorkbook wb) throws IOException {
response.setContentType("application/vnd.ms-excel");
response.setHeader("Content-disposition", "attachment; filename=" + fileName);
OutputStream ouputStream = null;
try {
ouputStream = response.getOutputStream();
wb.write(ouputStream);
} finally {
ouputStream.close();
}
}
// 表头样式
public static XSSFCellStyle getCellStyle(XSSFWorkbook wb) {
XSSFCellStyle style = wb.createCellStyle();
Font font = wb.createFont();
font.setFontName("宋体");
font.setFontHeightInPoints((short)12);// 设置字体大小
font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);// 加粗
style.setFillForegroundColor(HSSFColor.LIME.index);// 设置背景色
style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
style.setAlignment(HSSFCellStyle.SOLID_FOREGROUND);// 让单元格居中
style.setAlignment(HSSFCellStyle.ALIGN_CENTER);// 左右居中
style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);// 上下居中
style.setWrapText(true);// 设置自动换行
style.setFont(font);
return style;
}
}
3.使用：比如查询结果List
public class User{
@ExcelField(title = "序号")
private String id;
@ExcelField(title = "部门")
private String deptName;
controller:
/**
* @Description: 查询模块1表格数据
* @author kang
* @throws Exception
* @date 2016年8月25日
*/
@RequestMapping(value = "exportExcel", method = RequestMethod.POST)
public void exportExcel(Parameters parameters, HttpServletResponse response) throws Exception
{
List list = userService.selectByParameters(parameters);
XSSFWorkbook wb = ExcelUtil.createExcel(list, User.class, null);
String filename = getExcelName("表格");
ExcelUtil.writeExcel(response, filename, wb);
}
// 转化为excel名称
private String getExcelName(String filename) throws UnsupportedEncodingException {
String excelName = StringUtils.join(filename, ".xlsx");
return URLEncoder.encode(excelName, "UTF-8");
} 前端：
1.如果是jsp ，有一个隐藏form，调用form的submit方法，下载完成后浏览器下方才会显示已下载的文件
2.或者如果用js
var f = document.createElement("form");
document.body.appendChild(f);
var input = document.createElement("input");
input.type = "hidden";
f.appendChild(input);
input.name = "param";
input.value = "xxx";
f.method="POST";
f.action = "xxx/exportExcel";
f.submit();
f.remove();