导出数据到Excle表格的方法详解
2018-01-15 22:25
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首先,需要一个Util类,楼主已经给大家封装好了。
package com.lanou.util;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.ByteArrayInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
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 javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.io.output.ByteArrayOutputStream;
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.hssf.util.CellRangeAddress;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.Font;
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;
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();
}<
c5a3
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}
/**
* 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);
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);
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);
// 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
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();
SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddhhmmssms");
String dateStr = sdf.format(new Date());
response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;charset=utf-8");
response.setHeader("Content-Disposition", "attachment;filename="+title+dateStr+".xlsx");
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();
}
}
public static void main(String[] args) throws IOException {
}
}
下面是测试类的书写方法
System.out.println("打印");
Map<String, Object> map = new HashMap<String, Object>();
List<ContractAndProductBean> list = contractService.showJOutProduct(map);
Map<String, String> headMap = new HashMap<String, String>();
headMap.put("contractproductid", "合同货物编号");
headMap.put("customname", "客户名称");
headMap.put("contractno", "合同编号");
headMap.put("deliveryperiod", "交货期限");
headMap.put("shiptime", "船期");
headMap.put("factoryname", "工厂名字");
headMap.put("productno", "货号");
headMap.put("cnumber", "数量");
System.out.println(JSON.toJSONString(list));
JSONArray jsonArray = JSON.parseArray(JSON.toJSONString(list));
ExcelUtil.downloadExcelFile("工厂信息", headMap, jsonArray, response);
大家要注意的是,使用前需要下载对应的jar包!
Util导入后,报错的导包语句,粘贴百度一下,很容易就找到对应的jar包了。
值得注意的是,导出的excle表头要和页面上的数据对应,不然会出现导出失败的情况!
有任何问题可随时联系我!
package com.lanou.util;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.ByteArrayInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
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 javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.io.output.ByteArrayOutputStream;
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.hssf.util.CellRangeAddress;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.Font;
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;
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();
}<
c5a3
br />
}
/**
* 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);
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);
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);
// 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
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();
SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddhhmmssms");
String dateStr = sdf.format(new Date());
response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;charset=utf-8");
response.setHeader("Content-Disposition", "attachment;filename="+title+dateStr+".xlsx");
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();
}
}
public static void main(String[] args) throws IOException {
}
}
下面是测试类的书写方法
System.out.println("打印");
Map<String, Object> map = new HashMap<String, Object>();
List<ContractAndProductBean> list = contractService.showJOutProduct(map);
Map<String, String> headMap = new HashMap<String, String>();
headMap.put("contractproductid", "合同货物编号");
headMap.put("customname", "客户名称");
headMap.put("contractno", "合同编号");
headMap.put("deliveryperiod", "交货期限");
headMap.put("shiptime", "船期");
headMap.put("factoryname", "工厂名字");
headMap.put("productno", "货号");
headMap.put("cnumber", "数量");
System.out.println(JSON.toJSONString(list));
JSONArray jsonArray = JSON.parseArray(JSON.toJSONString(list));
ExcelUtil.downloadExcelFile("工厂信息", headMap, jsonArray, response);
大家要注意的是,使用前需要下载对应的jar包!
Util导入后,报错的导包语句,粘贴百度一下,很容易就找到对应的jar包了。
值得注意的是,导出的excle表头要和页面上的数据对应,不然会出现导出失败的情况!
有任何问题可随时联系我!
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