概述
1.创建maven项目
2.在pom文件加入poi依赖
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>3.7</version>
</dependency>
3.写工具类
package Test;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFRichTextString;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.util.CellRangeAddress;
public class ExportExcel {
// 显示的导出表的标题
private String title;
// 导出表的列名
private String[] rowName;
private List<Object[]> dataList = new ArrayList<Object[]>();
// 构造函数,传入要导出的数据
public ExportExcel(String title, String[] rowName, List<Object[]> dataList) {
this.dataList = dataList;
this.rowName = rowName;
this.title = title;
}
// 导出数据
public void export(OutputStream out) throws Exception {
try {
HSSFWorkbook workbook = new HSSFWorkbook();
HSSFSheet sheet = workbook.createSheet(title);
// 产生表格标题行
HSSFRow rowm = sheet.createRow(0);
HSSFCell cellTitle = rowm.createCell(0);
//sheet样式定义【】
HSSFCellStyle columnTopStyle=this.getColumnTopStyle(workbook);
HSSFCellStyle style=this.getStyle(workbook);
sheet.addMergedRegion(new CellRangeAddress(0, 1, 0, (rowName.length - 1)));
cellTitle.setCellStyle(columnTopStyle);
cellTitle.setCellValue(title);
// 定义所需列数
int columnNum = rowName.length;
HSSFRow rowRowName = sheet.createRow(2);
// 将列头设置到sheet的单元格中
for (int n = 0; n < columnNum; n++) {
HSSFCell cellRowName = rowRowName.createCell(n);
cellRowName.setCellType(HSSFCell.CELL_TYPE_STRING);
HSSFRichTextString text = new HSSFRichTextString(rowName[n]);
cellRowName.setCellValue(text);
cellRowName.setCellStyle(columnTopStyle);
}
// 将查询到的数据设置到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;
if (j == 0) {
cell = row.createCell(j, HSSFCell.CELL_TYPE_NUMERIC);
cell.setCellValue(i + 1);
cell.setCellValue(obj[j].toString());
} else {
cell = row.createCell(j, HSSFCell.CELL_TYPE_STRING);
if (!"".equals(obj[j]) && obj[j] != null) {
cell.setCellValue(obj[j].toString());
}
}
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;
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) {
int length = currentCell.getStringCellValue().getBytes().length;
if (columnWidth < length) {
columnWidth = length;
}
}
}
}
if (colNum == 0) {
sheet.setColumnWidth(colNum, (columnWidth - 2) * 256);
} else {
sheet.setColumnWidth(colNum, (columnWidth + 4) * 256);
}
}
if (workbook != null) {
try {
workbook.write(out);
out.flush();
out.close();
} catch (Exception e) {
e.printStackTrace();
}
}
} catch (Exception e) {
}
}
/*
* 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();
// 设置低边框
style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
// 设置低边框颜色
style.setBottomBorderColor(HSSFColor.BLACK.index);
// 设置右边框
style.setBorderRight(HSSFCellStyle.BORDER_THIN);
// 设置顶边框
style.setTopBorderColor(HSSFColor.BLACK.index);
// 设置顶边框颜色
style.setTopBorderColor(HSSFColor.BLACK.index);
// 在样式中应用设置的字体
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);
style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
return style;
}
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;
}
}
4.写测试类
package Test;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;
public class Test {
public static void main(String[] args) throws Exception {
// TODO Auto-generated method stub
Object[] object1= {"tom",1};
Object[] object2= {"lili",2};
List<Object[]> list=new ArrayList<Object[]>();
list.add(object1);
list.add(object2);
String[] rowName= new String[]{"名字","年龄"};
ExportExcel exportExcel=new ExportExcel("Excel导出", rowName, list);
File file=new File("D://b.xls");
FileOutputStream out=new FileOutputStream(file);
exportExcel.export(out);
System.out.println("成功");
}
}
需要我们用的时候只需要
1.新建new ExportExcel(“Excel导出”, rowName, list);
第一个参数为表格标题,第二个参数为列名,第三个参数为数据,list放的是一个一个的数组,每一个数组为一行数据。
2. 指定文件位置
File file=new File(“D://b.xls”);
FileOutputStream out=new FileOutputStream(file);
3.调用ExportExcel的export(out)方法
后来发现如果不需要表格标题就不适用了,于是我在原有的基础上对ExportExcel的export(out)方法进行了改进,可以自动进行判断有没有标题
package Test;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFRichTextString;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.util.CellRangeAddress;
public class ExportExcel {
// 显示的导出表的标题
private String title;
// 导出表的列名
private String[] rowName;
private List<Object[]> dataList = new ArrayList<Object[]>();
// 构造函数,传入要导出的数据
public ExportExcel(String title, String[] rowName, List<Object[]> dataList) {
this.dataList = dataList;
this.rowName = rowName;
this.title = title;
}
// 导出数据
public void export(OutputStream out) throws Exception {
try {
int r=0;//列名
HSSFWorkbook workbook = new HSSFWorkbook();
//sheet样式定义【】
HSSFCellStyle columnTopStyle=this.getColumnTopStyle(workbook);
HSSFCellStyle style=this.getStyle(workbook);
HSSFSheet sheet=workbook.createSheet();
if(title==null) {
}else {
// 产生表格标题行
HSSFRow rowm = sheet.createRow(0);
HSSFCell cellTitle = rowm.createCell(0);
sheet.addMergedRegion(new CellRangeAddress(0, 1, 0, (rowName.length - 1)));
cellTitle.setCellStyle(columnTopStyle);
cellTitle.setCellValue(title);
r=2;//列在第几行
}
// 定义所需列数
int columnNum = rowName.length;
HSSFRow rowRowName = sheet.createRow(r);
// 将列头设置到sheet的单元格中
for (int n = 0; n < columnNum; n++) {
HSSFCell cellRowName = rowRowName.createCell(n);
cellRowName.setCellType(HSSFCell.CELL_TYPE_STRING);
HSSFRichTextString text = new HSSFRichTextString(rowName[n]);
cellRowName.setCellValue(text);
cellRowName.setCellStyle(columnTopStyle);
}
// 将查询到的数据设置到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=null;
if(title==null) {
row = sheet.createRow(i+1);// 创建行数
}else {
row = sheet.createRow(i + 3);// 创建行数
}
for (int j = 0; j < obj.length; j++) {
HSSFCell cell =row.createCell(j, HSSFCell.CELL_TYPE_NUMERIC);
if (!"".equals(obj[j]) && obj[j] != null) {
cell.setCellValue(obj[j].toString());
}else {
cell.setCellValue("null");
}
/* if (j == 0) {
cell = row.createCell(j, HSSFCell.CELL_TYPE_NUMERIC);
cell.setCellValue(i + 1);
cell.setCellValue(obj[j].toString());
} else {
cell = row.createCell(j, HSSFCell.CELL_TYPE_STRING);
if (!"".equals(obj[j]) && obj[j] != null) {
cell.setCellValue(obj[j].toString());
}
}*/
cell.setCellStyle(style);
}
}
columnNum = rowName.length;
// 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;
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) {
int length = currentCell.getStringCellValue().getBytes().length;
if (columnWidth < length) {
columnWidth = length;
}
}
}
}
if (colNum == 0) {
sheet.setColumnWidth(colNum, (columnWidth - 2) * 256);
} else {
sheet.setColumnWidth(colNum, (columnWidth + 4) * 256);
}
}
if (workbook != null) {
try {
workbook.write(out);
out.flush();
out.close();
} catch (Exception e) {
e.printStackTrace();
}
}
} catch (Exception e) {
}
}
/*
* 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();
// 设置低边框
style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
// 设置低边框颜色
style.setBottomBorderColor(HSSFColor.BLACK.index);
// 设置右边框
style.setBorderRight(HSSFCellStyle.BORDER_THIN);
// 设置顶边框
style.setTopBorderColor(HSSFColor.BLACK.index);
// 设置顶边框颜色
style.setTopBorderColor(HSSFColor.BLACK.index);
// 在样式中应用设置的字体
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);
style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
return style;
}
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;
}
}
测试代码:
package Test;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;
public class Test {
public static void main(String[] args) throws Exception {
// TODO Auto-generated method stub
Object[] object1= {"tom",1};
Object[] object2= {"lili",2};
List<Object[]> list=new ArrayList<Object[]>();
list.add(object1);
list.add(object2);
String[] rowName= new String[]{"名字","年龄"};
//ExportExcel exportExcel=new ExportExcel("Excel导出", rowName, list);
ExportExcel exportExcel=new ExportExcel(null, rowName, list);
File file=new File("D://b.xls");
FileOutputStream out=new FileOutputStream(file);
exportExcel.export(out);
System.out.println("成功");
}
}
这样就可以写标题也可以不写标题了;
最后
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