-
maven依赖
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>3.14</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>3.14</version>
</dependency>
2.util导入项目
package com.gl.crpt.szzgc.util;
import java.io.*;
import java.math.BigDecimal;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;
import org.apache.poi.hpsf.SummaryInformation;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFClientAnchor;
import org.apache.poi.hssf.usermodel.HSSFComment;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFPatriarch;
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.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.xssf.streaming.SXSSFCell;
import org.apache.poi.xssf.streaming.SXSSFRow;
import org.apache.poi.xssf.streaming.SXSSFSheet;
import org.apache.poi.xssf.streaming.SXSSFWorkbook;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
/**
* POI导出导入util
*/
public class ExcelUtil {
public static String NO_DEFINE = "no_define";//未定义的字段
public static String DEFAULT_DATE_PATTERN = "yyyy年MM月dd日";//默认日期格式
public static int DEFAULT_COLOUMN_WIDTH = 17;
/**
* 导出Excel 97(.xls)格式 ，少量数据
*
* @param title 标题行
* @param headMap 属性-列名
* @param jsonArray 数据集
* @param datePattern 日期格式，null则用默认日期格式
* @param colWidth 列宽 默认 至少17个字节
* @param out 输出流
*/
public static void exportExcel(String title, Map<String, String> headMap, JSONArray jsonArray, String datePattern, int colWidth, OutputStream out) {
if (datePattern == null) datePattern = DEFAULT_DATE_PATTERN;
// 声明一个工作薄
HSSFWorkbook workbook = new HSSFWorkbook();
workbook.createInformationProperties();
workbook.getDocumentSummaryInformation().setCompany("*****公司");
SummaryInformation si = workbook.getSummaryInformation();
si.setAuthor("JACK"); //填加xls文件作者信息
si.setApplicationName("导出程序"); //填加xls文件创建程序信息
si.setLastAuthor("最后保存者信息"); //填加xls文件最后保存者信息
si.setComments("JACK is a programmer!"); //填加xls文件作者信息
si.setTitle("POI导出Excel"); //填加xls文件标题信息
si.setSubject("POI导出Excel");//填加文件主题信息
si.setCreateDateTime(new Date());
//表头样式
HSSFCellStyle titleStyle = workbook.createCellStyle();
titleStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
HSSFFont titleFont = workbook.createFont();
titleFont.setFontHeightInPoints((short) 20);
titleFont.setBoldweight((short) 700);
titleStyle.setFont(titleFont);
// 列头样式
HSSFCellStyle headerStyle = workbook.createCellStyle();
headerStyle.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
headerStyle.setBorderBottom(HSSFCellStyle.BORDER_THIN);
headerStyle.setBorderLeft(HSSFCellStyle.BORDER_THIN);
headerStyle.setBorderRight(HSSFCellStyle.BORDER_THIN);
headerStyle.setBorderTop(HSSFCellStyle.BORDER_THIN);
headerStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
HSSFFont headerFont = workbook.createFont();
headerFont.setFontHeightInPoints((short) 12);
headerFont.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
headerStyle.setFont(headerFont);
// 单元格样式
HSSFCellStyle cellStyle = workbook.createCellStyle();
cellStyle.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
cellStyle.setBorderBottom(HSSFCellStyle.BORDER_THIN);
cellStyle.setBorderLeft(HSSFCellStyle.BORDER_THIN);
cellStyle.setBorderRight(HSSFCellStyle.BORDER_THIN);
cellStyle.setBorderTop(HSSFCellStyle.BORDER_THIN);
cellStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
cellStyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
HSSFFont cellFont = workbook.createFont();
cellFont.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);
cellStyle.setFont(cellFont);
// 生成一个(带标题)表格
HSSFSheet sheet = workbook.createSheet();
// 声明一个画图的顶级管理器
HSSFPatriarch patriarch = sheet.createDrawingPatriarch();
// 定义注释的大小和位置,详见文档
HSSFComment comment = patriarch.createComment(new HSSFClientAnchor(0,
0, 0, 0, (short) 4, 2, (short) 6, 5));
// 设置注释内容
comment.setString(new HSSFRichTextString("可以在POI中添加注释！"));
// 设置注释作者，当鼠标移动到单元格上是可以在状态栏中看到该内容.
comment.setAuthor("JACK");
//设置列宽
int minBytes = colWidth < DEFAULT_COLOUMN_WIDTH ? DEFAULT_COLOUMN_WIDTH : colWidth;//至少字节数
int[] arrColWidth = new int[headMap.size()];
// 产生表格标题行,以及设置列宽
String[] properties = new String[headMap.size()];
String[] headers = new String[headMap.size()];
int ii = 0;
for (Iterator<String> iter = headMap.keySet().iterator(); iter
.hasNext(); ) {
String fieldName = iter.next();
properties[ii] = fieldName;
headers[ii] = fieldName;
int bytes = fieldName.getBytes().length;
arrColWidth[ii] = bytes < minBytes ? minBytes : bytes;
sheet.setColumnWidth(ii, arrColWidth[ii] * 256);
ii++;
}
// 遍历集合数据，产生数据行
int rowIndex = 0;
for (Object obj : jsonArray) {
if (rowIndex == 65535 || rowIndex == 0) {
if (rowIndex != 0) sheet = workbook.createSheet();//如果数据超过了，则在第二页显示
HSSFRow titleRow = sheet.createRow(0);//表头 rowIndex=0
titleRow.createCell(0).setCellValue(title);
titleRow.getCell(0).setCellStyle(titleStyle);
sheet.addMergedRegion(new CellRangeAddress(0, 0, 0, headMap.size() - 1));
HSSFRow headerRow = sheet.createRow(1); //列头 rowIndex =1
for (int i = 0; i < headers.length; i++) {
headerRow.createCell(i).setCellValue(headers[i]);
headerRow.getCell(i).setCellStyle(headerStyle);
}
rowIndex = 2;//数据内容从 rowIndex=2开始
}
JSONObject jo = (JSONObject) JSONObject.toJSON(obj);
HSSFRow dataRow = sheet.createRow(rowIndex);
for (int i = 0; i < properties.length; i++) {
HSSFCell newCell = dataRow.createCell(i);
Object o = jo.get(properties[i]);
String cellValue = "";
if (o == null) cellValue = "";
else if (o instanceof Date) cellValue = new SimpleDateFormat(datePattern).format(o);
else cellValue = o.toString();
newCell.setCellValue(cellValue);
newCell.setCellStyle(cellStyle);
}
rowIndex++;
}
// 自动调整宽度
/*for (int i = 0; i < headers.length; i++) {
sheet.autoSizeColumn(i);
}*/
try {
workbook.write(out);
workbook.close();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 导出Excel 2007 OOXML (.xlsx)格式
*
* @param title 标题行
* @param headMap 属性-列头
* @param jsonArray 数据集
* @param datePattern 日期格式，传null值则默认 年月日
* @param colWidth 列宽 默认 至少17个字节
* @param out 输出流
*/
public static void exportExcelX(String title, Map<String, String> headMap, JSONArray jsonArray, String datePattern, int colWidth, OutputStream out) {
if (datePattern == null) datePattern = DEFAULT_DATE_PATTERN;
// 声明一个工作薄
SXSSFWorkbook workbook = new SXSSFWorkbook(1000);//缓存
workbook.setCompressTempFiles(true);
//表头样式
CellStyle titleStyle = workbook.createCellStyle();
titleStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
Font titleFont = workbook.createFont();
titleFont.setFontHeightInPoints((short) 20);
//titleFont.setBoldweight((short) 700);
titleFont.setBoldweight((short) 700);
titleStyle.setFont(titleFont);
// 列头样式
CellStyle headerStyle = workbook.createCellStyle();
headerStyle.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
headerStyle.setBorderBottom(HSSFCellStyle.BORDER_THIN);
headerStyle.setBorderLeft(HSSFCellStyle.BORDER_THIN);
headerStyle.setBorderRight(HSSFCellStyle.BORDER_THIN);
headerStyle.setBorderTop(HSSFCellStyle.BORDER_THIN);
headerStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
//设置列头背景颜色
headerStyle.setFillForegroundColor((short)(1));
Font headerFont = workbook.createFont();
headerFont.setFontHeightInPoints((short) 12);
headerFont.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
headerStyle.setFont(headerFont);
// 单元格样式
CellStyle cellStyle = workbook.createCellStyle();
cellStyle.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
cellStyle.setBorderBottom(HSSFCellStyle.BORDER_THIN);
cellStyle.setBorderLeft(HSSFCellStyle.BORDER_THIN);
cellStyle.setBorderRight(HSSFCellStyle.BORDER_THIN);
cellStyle.setBorderTop(HSSFCellStyle.BORDER_THIN);
cellStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
cellStyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
Font cellFont = workbook.createFont();
cellFont.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);
cellStyle.setFont(cellFont);
//设置数据行背景颜色
cellStyle.setFillForegroundColor((short)(1));
// 生成一个(带标题)表格
SXSSFSheet sheet = workbook.createSheet();
//设置列宽
int minBytes = colWidth < DEFAULT_COLOUMN_WIDTH ? DEFAULT_COLOUMN_WIDTH : colWidth;//至少字节数
int[] arrColWidth = new int[headMap.size()];
// 产生表格标题行,以及设置列宽
String[] properties = new String[headMap.size()];
String[] headers = new String[headMap.size()];
int ii = 0;
for (Iterator<String> iter = headMap.keySet().iterator(); iter
.hasNext(); ) {
String fieldName = iter.next();
properties[ii] = fieldName;
headers[ii] = headMap.get(fieldName);
int bytes = fieldName.getBytes().length;
arrColWidth[ii] = bytes < minBytes ? minBytes : bytes;
sheet.setColumnWidth(ii, arrColWidth[ii] * 256);
ii++;
}
// 遍历集合数据，产生数据行
int rowIndex = 0;
for (Object obj : jsonArray) {
if (rowIndex == 65535 || rowIndex == 0) {
if (rowIndex != 0) sheet = workbook.createSheet();//如果数据超过了，则在第二页显示
SXSSFRow titleRow = sheet.createRow(0);//表头 rowIndex=0
titleRow.createCell(0).setCellValue(title);
titleRow.getCell(0).setCellStyle(titleStyle);
sheet.addMergedRegion(new CellRangeAddress(0, 0, 0, headMap.size() - 1));
SXSSFRow headerRow = sheet.createRow(1); //列头 rowIndex =1
for (int i = 0; i < headers.length; i++) {
headerRow.createCell(i).setCellValue(headers[i]);
headerRow.getCell(i).setCellStyle(headerStyle);
}
rowIndex = 2;//数据内容从 rowIndex=2开始
}
JSONObject jo = (JSONObject) JSONObject.toJSON(obj);
SXSSFRow dataRow = sheet.createRow(rowIndex);
for (int i = 0; i < properties.length; i++) {
SXSSFCell newCell = dataRow.createCell(i);
Object o = jo.get(properties[i]);
String cellValue = "";
if (o == null) cellValue = "";
else if (o instanceof Date) cellValue = new SimpleDateFormat(datePattern).format(o);
else if (o instanceof Float || o instanceof Double)
cellValue = new BigDecimal(o.toString()).setScale(2, BigDecimal.ROUND_HALF_UP).toString();
else cellValue = o.toString();
newCell.setCellValue(cellValue);
newCell.setCellStyle(cellStyle);
}
rowIndex++;
}
// 自动调整宽度
/*for (int i = 0; i < headers.length; i++) {
sheet.autoSizeColumn(i);
}*/
try {
workbook.write(out);
workbook.close();
workbook.dispose();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* Web 导出excel（浏览器的导出）
* @param title
* @param headMap
* @param ja
* @param response
*/
public static void downloadExcelFile(String title, Map<String, String> headMap, JSONArray ja, HttpServletResponse response) {
try {
ByteArrayOutputStream os = new ByteArrayOutputStream();
ExcelUtil.exportExcelX(title, headMap, ja, null, 0, os);
byte[] content = os.toByteArray();
InputStream is = new ByteArrayInputStream(content);
// 设置response参数，可以打开下载页面
response.reset();
response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;charset=utf-8");
response.setHeader("Content-Disposition", "attachment;filename=" + new String((title + ".xlsx").getBytes(), "iso-8859-1"));
response.setContentLength(content.length);
ServletOutputStream outputStream = response.getOutputStream();
BufferedInputStream bis = new BufferedInputStream(is);
BufferedOutputStream bos = new BufferedOutputStream(outputStream);
byte[] buff = new byte[8192];
int bytesRead;
while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {
bos.write(buff, 0, bytesRead);
}
bis.close();
bos.close();
outputStream.flush();
outputStream.close();
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 测试类
* @param args
* @throws IOException
*/
public static void main(String[] args) throws IOException {
int count = 100000;
JSONArray ja = new JSONArray();
for (int i = 0; i < 100000; i++) {
Student s = new Student();
s.setName("POI" + i);
s.setAge(i);
s.setBirthday(new Date());
s.setHeight(i);
s.setWeight(i);
s.setSex(i / 2 == 0 ? false : true);
ja.add(s);
}
Map<String, String> headMap = new LinkedHashMap<String, String>();
headMap.put("name", "姓名");
headMap.put("age", "年龄");
headMap.put("birthday", "生日");
headMap.put("height", "身高");
headMap.put("weight", "体重");
headMap.put("sex", "性别");
String title = "测试";
/*
OutputStream outXls = new FileOutputStream("E://a.xls");
System.out.println("正在导出xls....");
Date d = new Date();
ExcelUtil.exportExcel(title,headMap,ja,null,outXls);
System.out.println("共"+count+"条数据,执行"+(new Date().getTime()-d.getTime())+"ms");
outXls.close();*/
//
OutputStream outXlsx = new FileOutputStream("E://b.xlsx");
System.out.println("正在导出xlsx....");
Date d2 = new Date();
ExcelUtil.exportExcelX(title, headMap, ja, null, 0, outXlsx);
System.out.println("共" + count + "条数据,执行" + (new Date().getTime() - d2.getTime()) + "ms");
outXlsx.close();
}
}
3.调用工具开始测试（接口）
package com.gl.crpt.szzgc.controller;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.gl.crpt.system.entity.User;
import com.gl.crpt.szzgc.util.ExcelUtil;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import javax.servlet.http.HttpServletResponse;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
@RequestMapping("/test1")
@RestController
public class DcPoi {
@RequestMapping("/ttss")
public void partExport(HttpServletResponse response){
Map<String,String> headMap = new HashMap<>();
headMap.put("comName","企业名称");
headMap.put("email","邮箱地址");
headMap.put("password","密码");
List<User> list = new ArrayList<>();
User user = new User();
user.setComName("企业一");
user.setEmail("999999999@qq.com");
user.setPassword("123456");
User user1 = new User();
user1.setComName("企业二");
user1.setEmail("8888888888@qq.com");
user1.setPassword("123456");
list.add(user);
list.add(user1);
JSONArray ja= JSONArray.parseArray(JSON.toJSONString(list));
//表头
String title = "用户数据目录";
ExcelUtil.downloadExcelFile(title,headMap,ja,response);
}
}
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