1、maven添加依赖
<!-- https://mvnrepository.com/artifact/org.apache.poi/poi -->
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>4.0.1</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.poi/poi-ooxml -->
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>4.0.1</version>
</dependency>
2、工具类ExportExcelUtils
用户生成表格
package com.cy.pj.common.util;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.*;
import org.apache.poi.xssf.usermodel.extensions.XSSFCellBorder;
import com.cy.pj.sys.entity.ExcelData;
import javax.servlet.http.HttpServletResponse;
import java.io.OutputStream;
import java.net.URLEncoder;
import java.util.List;
public class ExportExcelUtils {
/**
* 下载文件
* @param response
* @param fileName
* @param data
* @throws Exception
*/
public static void exportExcel(HttpServletResponse response, String fileName, ExcelData data) throws Exception {
// 告诉浏览器用什么软件可以打开此文件
response.setHeader("content-Type", "application/vnd.ms-excel");
// 下载文件的默认名称
response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "utf-8"));
exportExcel(data, response.getOutputStream());
}
/**
* 创建 表格
* @param data
* @param out
* @throws Exception
*/
public static void exportExcel(ExcelData data, OutputStream out) throws Exception {
XSSFWorkbook wb = new XSSFWorkbook();
try {
String sheetName = data.getName();
if (null == sheetName) {
sheetName = "Sheet1";
}
XSSFSheet sheet = wb.createSheet(sheetName);
writeExcel(wb, sheet, data);
wb.write(out);
} finally {
wb.close();
}
}
/**
* 将数据写入表格
* @param wb
* @param sheet
* @param data
*/
private static void writeExcel(XSSFWorkbook wb, Sheet sheet, ExcelData data) {
int rowIndex = 0;
rowIndex = writeTitlesToExcel(wb, sheet, data.getTitles());
writeRowsToExcel(wb, sheet, data.getRows(), rowIndex);
autoSizeColumns(sheet, data.getTitles().size() + 1);
}
/**
* 写入表头
* @param wb
* @param sheet
* @param titles
* @return
*/
private static int writeTitlesToExcel(XSSFWorkbook wb, Sheet sheet, List<String> titles) {
int rowIndex = 0;
int colIndex = 0;
Font titleFont = wb.createFont();//获取字体
titleFont.setFontName("simsun");//设置字体名称(宋体)
titleFont.setBold(true);//设置字体加粗
titleFont.setColor(IndexedColors.BLACK.index);//设置字体颜色 黑色
XSSFCellStyle titleStyle = wb.createCellStyle();//获取单元格样式
titleStyle.setAlignment(HorizontalAlignment.CENTER);//设置单元格的水平对齐类型(这里是水平居中)
titleStyle.setVerticalAlignment(VerticalAlignment.CENTER);//设置单元格的垂直对齐类型(这里是居中)
titleStyle.setFillForegroundColor(createXssfColor("#FFFFFF"));//设置单元格前景色(白色)
titleStyle.setFillPattern(FillPatternType.SOLID_FOREGROUND);//指定图案和纯色单元格填充的单元格填充信息(实心前景)
titleStyle.setFont(titleFont);//设置字体样式
setBorder(titleStyle, BorderStyle.THIN, createXssfColor("#000000"));//设置边框样式(细线、黑色)
Row titleRow = sheet.createRow(rowIndex);//在该工作簿中创建第一行.
colIndex = 0;
for (String field : titles) {//循环创建列
Cell cell = titleRow.createCell(colIndex);
cell.setCellValue(field);
cell.setCellStyle(titleStyle);
colIndex++;
}
rowIndex++;//将行数++ 返回用于下面添加数据
return rowIndex;
}
/**
* 将数据写入
* @param wb
* @param sheet
* @param rows
* @param rowIndex
* @return
*/
private static int writeRowsToExcel(XSSFWorkbook wb, Sheet sheet, List<List<Object>> rows, int rowIndex) {
int colIndex = 0;
Font dataFont = wb.createFont();//获取字体
dataFont.setFontName("simsun");//设置字体名称(宋体)
dataFont.setColor(IndexedColors.BLACK.index);//设置字体颜色 黑色
XSSFCellStyle dataStyle = wb.createCellStyle();//获取单元格样式
dataStyle.setAlignment(HorizontalAlignment.CENTER);//设置单元格的水平对齐类型(这里是水平居中)
dataStyle.setVerticalAlignment(VerticalAlignment.CENTER);//设置单元格的垂直对齐类型(这里是居中)
dataStyle.setFont(dataFont);//设置字体样式
setBorder(dataStyle, BorderStyle.THIN, createXssfColor("#000000"));//设置边框样式(细线、黑色)
for (List<Object> rowData : rows) {//循环写入数据
Row dataRow = sheet.createRow(rowIndex);
colIndex = 0;
for (Object cellData : rowData) {
Cell cell = dataRow.createCell(colIndex);
if (cellData != null) {
cell.setCellValue(cellData.toString());
} else {
cell.setCellValue("");
}
cell.setCellStyle(dataStyle);
colIndex++;
}
rowIndex++;
}
return rowIndex;
}
/**
* 自动调整大小
* @param sheet
* @param columnNumber
*/
private static void autoSizeColumns(Sheet sheet, int columnNumber) {
for (int i = 0; i < columnNumber; i++) {
int orgWidth = sheet.getColumnWidth(i);
sheet.autoSizeColumn(i, true);
int newWidth = (int) (sheet.getColumnWidth(i) + 100);
if (newWidth > orgWidth) {
sheet.setColumnWidth(i, newWidth);
} else {
sheet.setColumnWidth(i, orgWidth);
}
}
}
/**
* 设置表格样式
* @param style
* @param border
* @param color
*/
private static void setBorder(XSSFCellStyle style, BorderStyle border, XSSFColor color) {
style.setBorderTop(border);
style.setBorderLeft(border);
style.setBorderRight(border);
style.setBorderBottom(border);
style.setBorderColor(XSSFCellBorder.BorderSide.TOP, color);
style.setBorderColor(XSSFCellBorder.BorderSide.LEFT, color);
style.setBorderColor(XSSFCellBorder.BorderSide.RIGHT, color);
style.setBorderColor(XSSFCellBorder.BorderSide.BOTTOM, color);
}
/**
* 将rgb颜色码 转换为 XSSFColor
* @param color
* @return
*/
private static XSSFColor createXssfColor(String color) {
int[] rgbColor = hexToRgb(color);
XSSFColor xssfColor = new XSSFColor(new java.awt.Color(rgbColor[0], rgbColor[1], rgbColor[2]), new DefaultIndexedColorMap());
return xssfColor;
}
/**
* 将颜色码 转换为 r g b
* @param hex
* @return
*/
public static int[] hexToRgb(String hex) {
String colorStr = hex;
if (hex.startsWith("#")) {
colorStr = hex.substring(1);
}
if (colorStr.length() == 8) {
colorStr = hex.substring(2);
}
int r= Integer.valueOf( colorStr.substring( 0, 2 ), 16 );
int g= Integer.valueOf( colorStr.substring( 2, 4 ), 16 );
int b= Integer.valueOf( colorStr.substring( 4, 6 ), 16 );
return new int[] { r, g, b };
}
}
3、VO类ExcelData
用于封装:表头、单元格数据、sheet表名称
@Data是lombok插件,可以自动生产set和get方法
package com.cy.pj.sys.entity;
import lombok.Data;
import java.io.Serializable;
import java.util.List;
@Data
public class ExcelData implements Serializable {
private static final long serialVersionUID = 4454016249210520899L;
/**
* 表头
*/
private List<String> titles;
/**
* 数据
*/
private List<List<Object>> rows;
/**
* 页签名称
*/
private String name;
}
4、测试类
@RequestMapping("/doExportUserExcel")
public void doExportUserExcel(HttpServletResponse response) throws Exception {
ExcelData data = new ExcelData();
data.setName("hello");//sheet表名称
//表头
List<String> titles = new ArrayList();
titles.add("姓名");
titles.add("性别");
titles.add("年龄");
titles.add("手机号");
data.setTitles(titles);
List<List<Object>> rows = new ArrayList();
List<Object> row1 = new ArrayList();
row1.add("张三");
row1.add("男");
row1.add("23");
row1.add("18612341234");
List<Object> row2 = new ArrayList();
row2.add("李四");
row2.add("女");
row2.add("24");
row2.add("15312341234");
rows.add(row1);
rows.add(row2);
data.setRows(rows);
ExportExcelUtils.exportExcel(response,"联系人表.xlsx",data);
// List userList = sysUserService.findUsers();
//
// ExcelData data = new ExcelData();
//
// data.setName("用户列表");//sheet名称
//
// List titles = new ArrayList();
// titles.add("编号");
// titles.add("用户名");
// titles.add("部门");
// titles.add("邮箱");
// titles.add("手机号");
// titles.add("状态");
// titles.add("创建时间");
// titles.add("修改时间");
// data.setTitles(titles);
//
//
// List> rows = new ArrayList();
// SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
// for(SysUser sysUser : userList) {
//
// List
// row.add(sysUser.getId());
// row.add(sysUser.getUsername());
// row.add(sysUser.getDeptId());
// row.add(sysUser.getEmail());
// row.add(sysUser.getMobile());
// row.add(sysUser.getValid());
// Date createdTime = sysUser.getCreatedTime();
//使用SimpleDateFormat 格式化Date需要判断Date不为null
//如果不进行判断,当Date为null时,会报空指针异常
// if(createdTime != null) {
// row.add(sdf.format(createdTime));
// }else {
// row.add("/");
// }
//
// Date modifiedTime = sysUser.getModifiedTime();
// if(modifiedTime != null) {
// row.add(sdf.format(modifiedTime));
// }else {
// row.add("/");
// }
// rows.add(row);
// }
// data.setRows(rows);
// ExportExcelUtils.exportExcel(response,"用户表.xlsx",data);
}