POI导出EXCEL

2019-05-22 10:48:23 作者：互联网

昨天说项目不兼容别人开源的轮子写了个读取导入

今天唉还要造轮子简直了，，，老项目已经改不动了只能造一个差不多的轮子安上跑吧导出导出导出

import org.apache.poi.hssf.usermodel.*;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.usermodel.IndexedColors;
import org.apache.poi.ss.util.CellRangeAddress;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;

public class ExportExcelUtil {

/**
* 显示的导出表的标题
*/
private String title;

/**
* 导出表的列名
*/
private String[] columnName;

/**
* 需要导出的数据集合
*/
private List<Object[]> dataList = new ArrayList<Object[]>();

/**
* 输入流对象
*/
private HttpServletRequest request;

/**
* 输出流对象
*/
private HttpServletResponse response;

/**
*
* @param title
* @param columnName
* @param dataList
* @param request
* @param response
* @description 构造方法，传入要导出的数据
*/
public ExportExcelUtil(String title, String[] columnName, List<Object[]> dataList) {
this.dataList = dataList;
this.columnName = columnName;
this.title = title;
}

/**
* @description 导出数据到excel
*/
public void export() throws Exception {

try {
HSSFWorkbook workbook = new HSSFWorkbook(); // 创建工作簿对象
HSSFSheet sheet = workbook.createSheet(title); // 创建工作表

// 产生表格标题行
HSSFRow rowm = sheet.createRow(0);
HSSFCell cellTiltle = rowm.createCell(0);

//设置标题和单元格样式
HSSFCellStyle columnTopStyle = this.getColumnTopStyle(workbook); //获取列头样式对象
HSSFCellStyle style = this.getStyle(workbook); //单元格样式对象

//合并单元格
sheet.addMergedRegion(new CellRangeAddress(0, 1, 0, (columnName.length - 1)));
cellTiltle.setCellStyle(columnTopStyle);
cellTiltle.setCellValue(title);

// 定义所需列数
int columnNum = columnName.length;
HSSFRow rowRowName = sheet.createRow(2); // 在索引2的位置创建行(最顶端的行开始的第二行)

// 将列头设置到sheet的单元格中
for (int n = 0; n < columnNum; n++) {
HSSFCell cellRowName = rowRowName.createCell(n); //创建列头对应个数的单元格
cellRowName.setCellType(HSSFCell.CELL_TYPE_STRING); //设置列头单元格的数据类型
HSSFRichTextString text = new HSSFRichTextString(columnName[n]);
cellRowName.setCellValue(text); //设置列头单元格的值
cellRowName.setCellStyle(columnTopStyle); //设置列头单元格样式
}

//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++) {
Object[] obj = dataList.get(i);//遍历每个对象
HSSFRow row = sheet.createRow(i + 3);//创建所需的行数
for (int j = 0; j < obj.length; j++) {
HSSFCell cell = null; //设置单元格的数据类型
//第一列为数字类型并设置单元格的值
if (j == 0) {
cell = row.createCell(j, HSSFCell.CELL_TYPE_NUMERIC);
cell.setCellValue(i + 1);
} else {
//其他列为字符串类型并设置单元格的值
cell = row.createCell(j, HSSFCell.CELL_TYPE_STRING);
if (!"".equals(obj[j]) && obj[j] != null) {
cell.setCellValue(obj[j].toString());
}
}
cell.setCellStyle(style); //设置单元格样式
}
}

//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) {
//取得当前的单元格
HSSFCell currentCell = currentRow.getCell(colNum);
//如果当前单元格类型为字符串
if (currentCell.getCellType() == HSSFCell.CELL_TYPE_STRING) {
int length = currentCell.getStringCellValue().getBytes().length;
if (columnWidth < length) {
//将单元格里面值大小作为列宽度
columnWidth = length;
}
}
}
}
//再根据不同列单独做下处理
if (colNum == 0) {
sheet.setColumnWidth(colNum, (columnWidth - 2) * 256);
} else {
sheet.setColumnWidth(colNum, (columnWidth + 4) * 256);
}
}

if (workbook != null) {
try {
String fileName = "D://downexcel//" + String.valueOf(System.currentTimeMillis()).substring(4, 13) + ".xls";
OutputStream out1 = new FileOutputStream(fileName);
workbook.write(out1);
} catch (IOException e) {
e.printStackTrace();
}
}

} catch (Exception e) {
e.printStackTrace();
}
}

/**
* @description 标题行的单元格样式
*/
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();
style.setFillForegroundColor(IndexedColors.BLUE.getIndex());
//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;
}

/**
* @param
* @description 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;
}
   public static void main(String[] args) {
       String title = "单据导出";
       String[] columnName = new String[]{"序号","num1","num2"};
       List<Object[]> dataList = new ArrayList<Object[]>();
       Object[] objs;
       for (int i = 0; i <5; i++) {
       objs = new Object[columnName.length];
       objs[0] = i;
       objs[1] = "1";
       objs[2] = "2";
       dataList.add(objs);
       }
       //实例化工具类
       ExportExcelUtil ex = new ExportExcelUtil(title, columnName, dataList);
       try {
       //导出excel
       ex.export();
       } catch (Exception e) {
       e.printStackTrace();
       }
   }


}

标签：style,sheet,设置,EXCEL,单元格,导出,HSSFCellStyle,POI,workbook
来源： https://blog.csdn.net/jjjjjl123456/article/details/90439025