所需依赖
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>ooxml-schemas</artifactId>
<version>1.1</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.23</version>
</dependency>
<dependency>
<groupId>cn.hutool</groupId>
<artifactId>hutool-all</artifactId>
<version>4.5.7</version>
</dependency>
import cn.hutool.core.util.StrUtil;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
import org.apache.poi.hssf.usermodel.*;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.util.CellRangeAddress;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;
public class ExportExcelUtil {
public void termStatiExp(HttpServletRequest request, HttpServletResponse response) {
List<Object> list = new ArrayList<Object>();
Student student1 = new Student("张1", "男");
Student student2 = new Student("张2", "女");
Student student3 = new Student("张三", "女");
Student student4 = new Student("张三", "男");
list.add(student1);
list.add(student2);
list.add(student3);
list.add(student4);
//将对象转换成JSONArray
JSONArray jsonArray = (JSONArray) JSON.toJSON(list);
if (jsonArray != null) {
String title = "测试表头";
String[] rowsName = new String[]{"序号", "姓名", "年龄"};
List<Object[]> dataList = new ArrayList<Object[]>();
Object[] objs = null;
for (int i = 0; i < jsonArray.size(); i++) {
JSONObject jsonObj = (JSONObject)JSON.toJSON(jsonArray.get(i));
objs = new Object[rowsName.length];
objs[0] = i + 1;
if (!StrUtil.isBlank(jsonObj.getString("sname"))) {
objs[1] = jsonObj.getString("sname");
} else {
objs[1] = "--";
}
if (!StrUtil.isBlank(jsonObj.getString("sex"))) {
objs[2] = jsonObj.getString("sex");
} else {
objs[2] = "--";
}
dataList.add(objs);
}
ExportExcelUtil ex = new ExportExcelUtil();
}
}
/**
* 导出数据
*/
public void export(HttpServletResponse response, String title, String[] rowName, List<Object[]> dataList)
throws Exception {
try {
// 创建工作簿对象
HSSFWorkbook workbook = new HSSFWorkbook();
// 创建工作表
HSSFSheet sheet = workbook.createSheet(title);
// 产生表格标题行
HSSFRow rowm = sheet.createRow(0);
HSSFCell cellTiltle = rowm.createCell(0);
// sheet样式定义【getColumnTopStyle()/getStyle()均为自定义方法 - 在下面 - 可扩展】
// 获取列头样式对象
HSSFCellStyle columnTopStyle = this.getColumnTopStyle(workbook);
// 单元格样式对象
HSSFCellStyle style = this.getStyle(workbook);
sheet.addMergedRegion(new CellRangeAddress(0, 1, 0, (rowName.length - 1)));
cellTiltle.setCellStyle(columnTopStyle);
cellTiltle.setCellValue(title);
// 定义所需列数
int columnNum = rowName.length;
// 在索引2的位置创建行(最顶端的行开始的第二行)
HSSFRow rowRowName = sheet.createRow(2);
// 将列头设置到sheet的单元格中
for (int n = 0; n < columnNum; n++) {
// 创建列头对应个数的单元格
HSSFCell cellRowName = rowRowName.createCell(n);
// 设置列头单元格的数据类型
cellRowName.setCellType(HSSFCell.CELL_TYPE_STRING);
HSSFRichTextString text = new HSSFRichTextString(rowName[n]);
// 设置列头单元格的值
cellRowName.setCellValue(text);
// 设置列头单元格样式
cellRowName.setCellStyle(columnTopStyle);
}
// 将查询出的数据设置到sheet对应的单元格中
for (int i = 0; i < dataList.size(); i++) {
// 遍历每个对象
Object[] obj = dataList.get(i);
// 创建所需的行数
HSSFRow row = sheet.createRow(i + 3);
for (int j = 0; j < obj.length; j++) {
// 设置单元格的数据类型
HSSFCell cell = null;
if (j == 0) {
cell = row.createCell(j, HSSFCell.CELL_TYPE_NUMERIC);
cell.setCellValue(i + 1);
} else {
cell = row.createCell(j, HSSFCell.CELL_TYPE_STRING);
if (!"".equals(obj[j]) && obj[j] != null) {
// 设置单元格的值
cell.setCellValue(obj[j].toString());
}
}
// 设置单元格样式
cell.setCellStyle(style);
}
}
// 让列宽随着导出的列长自动适应
for (int colNum = 0; colNum < columnNum; colNum++) {
int columnWidth = sheet.getColumnWidth(colNum) / 256;
for (int rowNum = 0; rowNum < sheet.getLastRowNum(); rowNum++) {
HSSFRow currentRow;
// 当前行未被使用过
if (sheet.getRow(rowNum) == null) {
currentRow = sheet.createRow(rowNum);
} else {
currentRow = sheet.getRow(rowNum);
}
if (currentRow.getCell(colNum) != null) {
HSSFCell currentCell = currentRow.getCell(colNum);
if (currentCell.getCellType() == HSSFCell.CELL_TYPE_STRING) {
if (currentCell.getRichStringCellValue() != null) {
int length = currentCell.getStringCellValue().getBytes().length;
// if (columnWidth < length) {
// columnWidth = length;
// }
if (columnWidth < 255 * 256) {
sheet.setColumnWidth(colNum, columnWidth < 3000 ? 3000 : columnWidth);
} else {
sheet.setColumnWidth(colNum, 6000);
}
}
}
}
}
if (colNum == 0) {
sheet.setColumnWidth(colNum, (columnWidth - 2) * 256);
} else {
sheet.setColumnWidth(colNum, (columnWidth + 4) * 256);
}
}
if (workbook != null) {
try {
String fileName = "Excel-" + title + String.valueOf(System.currentTimeMillis()).substring(4, 13)
+ ".xls";
String headStr = "attachment; filename=\"" + fileName + "\"";
response.setContentType("APPLICATION/OCTET-STREAM");
response.setHeader("Content-Disposition", headStr);
OutputStream out = response.getOutputStream();
workbook.write(out);
} catch (IOException e) {
e.printStackTrace();
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 列头单元格样式
*/
public HSSFCellStyle getColumnTopStyle(HSSFWorkbook workbook) {
// 设置字体
HSSFFont font = workbook.createFont();
// 设置字体大小
font.setFontHeightInPoints((short) 11);
// 字体加粗
font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
// 设置字体名字
font.setFontName("Courier New");
// 设置样式;
HSSFCellStyle style = workbook.createCellStyle();
// 设置底边框;
style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
// 设置底边框颜色;
style.setBottomBorderColor(HSSFColor.BLACK.index);
// 设置左边框;
style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
// 设置左边框颜色;
style.setLeftBorderColor(HSSFColor.BLACK.index);
// 设置右边框;
style.setBorderRight(HSSFCellStyle.BORDER_THIN);
// 设置右边框颜色;
style.setRightBorderColor(HSSFColor.BLACK.index);
// 设置顶边框;
style.setBorderTop(HSSFCellStyle.BORDER_THIN);
// 设置顶边框颜色;
style.setTopBorderColor(HSSFColor.BLACK.index);
// 在样式用应用设置的字体;
style.setFont(font);
// 设置自动换行;
style.setWrapText(false);
// 设置水平对齐的样式为居中对齐;
style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
// 设置垂直对齐的样式为居中对齐;
style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
return style;
}
/**
* 列数据信息单元格样式
*/
public HSSFCellStyle getStyle(HSSFWorkbook workbook) {
// 设置字体
HSSFFont font = workbook.createFont();
// 设置字体大小
// font.setFontHeightInPoints((short)10);
// 字体加粗
// font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
// 设置字体名字
font.setFontName("Courier New");
// 设置样式;
HSSFCellStyle style = workbook.createCellStyle();
// 设置底边框;
style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
// 设置底边框颜色;
style.setBottomBorderColor(HSSFColor.BLACK.index);
// 设置左边框;
style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
// 设置左边框颜色;
style.setLeftBorderColor(HSSFColor.BLACK.index);
// 设置右边框;
style.setBorderRight(HSSFCellStyle.BORDER_THIN);
// 设置右边框颜色;
style.setRightBorderColor(HSSFColor.BLACK.index);
// 设置顶边框;
style.setBorderTop(HSSFCellStyle.BORDER_THIN);
// 设置顶边框颜色;
style.setTopBorderColor(HSSFColor.BLACK.index);
// 在样式用应用设置的字体;
style.setFont(font);
// 设置自动换行;
style.setWrapText(false);
// 设置水平对齐的样式为居中对齐;
style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
// 设置垂直对齐的样式为居中对齐;
style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
return style;
}
}