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加入非poi的excel导出，导出数据类型灵活（得益于jdk8+的 BiFuntion使用）

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lxyer
2018-07-06 10:53:42 +08:00
parent aaa80c9678
commit f7b0fb28b5
7 changed files with 727 additions and 217 deletions
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src/excel/ExcelExportKit.java Normal file
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src/excel/poi/ExcelKit.java Normal file
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package excel.poi;
import org.apache.poi.hssf.usermodel.HSSFCell;
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.poifs.filesystem.OfficeXmlFileException;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.lang.reflect.Field;
import java.text.SimpleDateFormat;
import java.util.*;
/**
* 使用poi报表导出工具类
* 把poi的一个调用接口抽出来，便于导出功能的管理
* @author LiangXianYou lxy208@126.com
* @param
*
*/
public class ExcelKit {
/**
* <b>导出list中map做载体的数据到excel</b><br>
* 参数说明：<br>
* list:存放了Map数据的集合<br>
* hdNames:表头列名<br>
* hds:对应表头的数据KEY<br>
* xlsName:导出文件名<br>
* @author LiangXianYou
* @date 2015-6-25 上午10:22:51
*/
public static <T> boolean exportByMap(List<Map<String, Object>> list, String[] hdNames, String[] hds, String xlsName, HttpServletRequest request, HttpServletResponse response) throws Exception{
Workbook wb = new XSSFWorkbook(); //创建工作薄
Sheet sheet = wb.createSheet(); //创建工作表
sheet.autoSizeColumn(( short ) 0 ); //自适应宽度
//写入表头---Excel的第一行数据
Row nRow = sheet.createRow(0); //创建行
for(int i=0;i<hdNames.length;i++){
Cell nCell = nRow.createCell(i); //创建单元格
nCell.setCellValue(hdNames[i]);
}
//写入每一行数据---一条记录就是一行数据
for(int i=0;i<list.size();i++){
for(int j=0;j<hds.length;j++){
Object o = list.get(i).get(hds[j]); //得到列的值
data2Excel(sheet, o, i+1, j); //将值写入Excel
}
}
return downloadExcel(wb, xlsName, request, response);
}
/**
* Excels导出多个sheet
* @author LiangXianYou
* @date 2015-6-16 下午5:56:56
*/
//map:data,sheetName,hds,hdNames,xlsName;request,response
public static <T> boolean exportExcels(List<Map<String, Object>> list,String xlsName, HttpServletRequest request, HttpServletResponse response) throws Exception{
Workbook wb = new XSSFWorkbook(); //创建工作薄
for(int i=0;i<list.size();i++){
Map<String, Object> map = list.get(i);
Sheet sheet = wb.createSheet(); //创建工作表
String sheetName = (String) map.get("sheetName");
wb.setSheetName(i, sheetName);
//写入表头---Excel的第一行数据
Row nRow = sheet.createRow(0); //创建行
String[] hdNames = (String[]) map.get("hdNames");
for(int j=0;j<hdNames.length;j++){
Cell nCell = nRow.createCell(j); //创建单元格
nCell.setCellValue(hdNames[j]);
}
//写入每一行数据---一条记录就是一行数据
@SuppressWarnings("unchecked")
List<T> data = (List<T>) map.get("data");
String[] hds = (String[]) map.get("hds");
for(int j=0;j<data.size();j++){
for(int k=0;k<hds.length;k++){
Object o = getFieldValue(data.get(j), hds[k]); //得到列的值
data2Excel(sheet, o, j+1, k); //将值写入Excel
}
}
}
return downloadExcel(wb, xlsName, request, response);
}
/**
* 参数说明：
* list：list数据集合
* hdNames：表头需要显示的名称
* hds：表头对应的对象属性名称，和 hdNames一一对应
* xlsName：导出Excel的预定义名称
* request: HttpServletRequest
* response：HttpServletResponse
* 通过数据构建Excel
* @author LiangXianYou
* @throws Exception
* @date 2015-3-13 上午11:00:30
*/
public static <T> boolean exportExcel(List<T> list, String[] hdNames, String[] hds, String xlsName, HttpServletRequest request, HttpServletResponse response) throws Exception{
Workbook wb = new XSSFWorkbook(); //创建工作薄
Sheet sheet = wb.createSheet(); //创建工作表
sheet.autoSizeColumn(( short ) 0 ); //自适应宽度
//写入表头---Excel的第一行数据
Row nRow = sheet.createRow(0); //创建行
for(int i=0;i<hdNames.length;i++){
Cell nCell = nRow.createCell(i); //创建单元格
nCell.setCellValue(hdNames[i]);
}
//写入每一行数据---一条记录就是一行数据
for(int i=0;i<list.size();i++){
for(int j=0;j<hds.length;j++){
Object o = getFieldValue(list.get(i), hds[j]); //得到列的值
data2Excel(sheet, o, i+1, j); //将值写入Excel
}
}
return downloadExcel(wb, xlsName, request, response);
}
/**
* 传递一个Wookbook，给定文件名，以及request和response下载Excel文档
* @author LiangXianYou
* @throws IOException
* @date 2015-3-13 上午9:00:36
*/
@SuppressWarnings("all")
private static boolean downloadExcel(Workbook wb, String xlsName, HttpServletRequest request, HttpServletResponse response) throws IOException{
if(request.getHeader("user-agent").indexOf("MSIE") != -1) {
xlsName = java.net.URLEncoder.encode(xlsName,"utf-8") + ".xls";
} else {
xlsName = new String(xlsName.getBytes("utf-8"),"iso-8859-1")+ ".xls";
}
OutputStream os = response.getOutputStream();
response.setContentType("application/vnd.ms-excel");
response.setHeader("Content-disposition", "attachment;filename="+xlsName);
wb.write(os);
return true;
}
/**
* 通过泛型实例对象得到某一字段值
* @author LiangXianYou
* @date 2015-3-13 上午10:53:32
*/
private static <T> Object getFieldValue(T t, String fieldName) throws Exception{
if(t == null){
return null;
}
Field field = t.getClass().getDeclaredField(fieldName);
field.setAccessible(true);//暴力反射
Object o = field.get(t);//得到字段数据的值
return o;
}
/**
* 将数据写到Excel中
* @author LiangXianYou
* @date 2015-3-13 上午10:37:55
*/
private static void data2Excel(Sheet sheet, Object o, Integer r, Integer c){
//通过获得sheet中的某一列，有得到，没有创建
Row nRow = sheet.getRow(r);
if(nRow == null){
nRow = sheet.createRow(r);
}
// nRow.setColumnWidth(r, arg1);
Cell nCell = nRow.createCell(c);
//根据不同类型进行转化，如有其它类型没有考虑周全的，使用发现的时候添加
char type = 'x';
if(o instanceof Integer){
type = 1;
}else if(o instanceof Double){
type = 2;
}else if(o instanceof Float){
type = 3;
}else if(o instanceof String){
type = 4;
}else if(o instanceof Date){
type = 5;
}else if(o instanceof Calendar){
type = 6;
}else if(o instanceof Boolean){
type = 7;
}else if(o == null) {
type = 8;
}
switch (type) {
case 1:nCell.setCellValue((Integer)o);break;
case 2:nCell.setCellValue((Double)o);break;
case 3:nCell.setCellValue((Float)o);break;
case 4:nCell.setCellValue((String)o);break;
case 5:nCell.setCellValue(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(o));break;
case 6:nCell.setCellValue((Calendar)o);break;
case 7:nCell.setCellValue((Boolean)o);break;
case 8:nCell.setCellValue("");break;
default:nCell.setCellValue(o + "");break;
}
}
//读取 excel
//读取excel表头
public static Map readExcelHead(File file, String[] fields) throws IOException {
List<Map> list = null;
try {
list = readExcel(new FileInputStream(file), fields, 0);//2007 -
} catch (OfficeXmlFileException e) {
list = readExcelPlus(new FileInputStream(file), fields, 0);//2007 +
}
return list.size() > 0 ? list.get(0) : new HashMap();
}
//读取excel表头
public static Map readExcelHead(String fPath, String[] fields) throws IOException {
return readExcelHead(new File(fPath), fields);
}
public static List<Map> readExcel(File file, String[] fields) throws IOException {
List<Map> list = null;
try {
list = readExcel(new FileInputStream(file), fields, -1);//2007 -
} catch (OfficeXmlFileException e) {
list = readExcelPlus(new FileInputStream(file), fields, -1);//2007 +
}
//去除表头
if (list.size() > 0){
list.remove(0);
}
return list;
}
public static List<Map> readExcel(String fPath, String[] fields) throws IOException {
return readExcel(new File(fPath), fields);
}
/**
* excel读取2007-
* @author Lxyer 2016/8/1 10:32.
*/
private static List<Map> readExcel(InputStream is, String[] fields, int lastRowNum) throws IOException,OfficeXmlFileException {
List<Map> list = new ArrayList<>();
HSSFWorkbook wk = new HSSFWorkbook(is);
HSSFSheet sheet = wk.getSheetAt(0);
if (lastRowNum < 0 || lastRowNum > sheet.getLastRowNum()){
lastRowNum = sheet.getLastRowNum();
}
int t = 0;
r:for (int i=0; i<=lastRowNum; i++){
HSSFRow row = sheet.getRow(i);
if (row == null) continue ;
short cellNum = row.getLastCellNum();
//空跳过/连续三行为空结束
if (isEmptyRow(row, fields.length)) {
if (t++ > 3) break;
continue ;
}
Map map = new HashMap();
for (int j=0; j<cellNum && j<fields.length; j++){
HSSFCell cell = row.getCell(j);
if (cell == null){
map.put(fields[j], "");
continue;
}
int cellType = cell.getCellType();
if (cellType == 0){
map.put(fields[j], (long)cell.getNumericCellValue()+"");
}else {
map.put(fields[j], cell.getStringCellValue());
}
}
list.add(map);
}
return list;
}
/**
* excel读取 2007+
* @author Lxyer 2016/8/1 10:32.
*/
private static List<Map> readExcelPlus(InputStream is, String[] fields, int lastRowNum) throws IOException {
List<Map> list = new ArrayList<>();
XSSFWorkbook wk = new XSSFWorkbook(is);
XSSFSheet sheet = wk.getSheetAt(0);
if (lastRowNum < 0 || lastRowNum > sheet.getLastRowNum()){
lastRowNum = sheet.getLastRowNum();
}
int t=0;
r:for (int i=0; i<=lastRowNum; i++){
XSSFRow row = sheet.getRow(i);
if (row == null) continue ;
short cellNum = row.getLastCellNum();
if (isEmptyRow(row, fields.length)) {
if (t++ > 3) break;
continue ;
}
Map map = new HashMap();
//读取数据
for (int j=0; j<cellNum && j<fields.length; j++){
XSSFCell cell = row.getCell(j);
if (cell == null){
map.put(fields[j], "");
continue;
}
int cellType = cell.getCellType();
if (cellType == 0){
map.put(fields[j], (long)cell.getNumericCellValue()+"");
}else {
map.put(fields[j], cell.getStringCellValue());
}
}
list.add(map);
}
return list;
}
//空跳过/连续三行为空结束
private static boolean isEmptyRow(XSSFRow row, int len){
for (int i = 0; i< row.getLastCellNum() && i < len; i++) {
XSSFCell cell = row.getCell(i);//列
if (cell != null && cell.getCellType() != 0
&& cell.getStringCellValue() != null
&& !cell.getStringCellValue().isEmpty()){
//System.out.println("---F");
return false;
}
}
//System.out.println("---T");
return true;
}
private static boolean isEmptyRow(HSSFRow row, int len){
for (int i = 0; i< row.getLastCellNum() && i < len; i++) {
HSSFCell cell = row.getCell(i);//列
if (cell != null && cell.getCellType() != 0
&& cell.getStringCellValue() != null
&& !cell.getStringCellValue().isEmpty()){
//System.out.println("---F");
return false;
}
}
//System.out.println("---T");
return true;
}
}