版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/whm18322394724/article/details/82730216
最近做了一些简单的导入导出，也遇到了一些问题，下边简单记录一下。
工具类
package com.jdy.core.util;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.apache.poi.hssf.usermodel.DVConstraint;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFDataValidation;
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.CellRangeAddressList;
/*
* ExcelUtil工具类实现功能:
* 导出时传入list<T>,即可实现导出为一个excel,其中每个对象Ｔ为Excel中的一条记录.
* 导入时读取excel,得到的结果是一个list<T>.T是自己定义的对象.
* 需要导出的实体对象只需简单配置注解就能实现灵活导出,通过注解您可以方便实现下面功能:
* 1.实体属性配置了注解就能导出到excel中,每个属性都对应一列.
* 2.列名称可以通过注解配置.
* 3.导出到哪一列可以通过注解配置.
* 4.鼠标移动到该列时提示信息可以通过注解配置.
* 5.用注解设置只能下拉选择不能随意填写功能.
* 6.用注解设置是否只导出标题而不导出内容,这在导出内容作为模板以供用户填写时比较实用.
* 本工具类以后可能还会加功能,请关注我的博客: http://blog.csdn.net/lk_blog
*/
public class ExcelUtil<T> {
Class<T> clazz;
public ExcelUtil(Class<T> clazz) {
this.clazz = clazz;
}
public List<T> importExcel(String sheetName, InputStream input) {
int maxCol = 0;
List<T> list = new ArrayList<T>();
try {
HSSFWorkbook workbook = new HSSFWorkbook(input);
HSSFSheet sheet = workbook.getSheet(sheetName);
if (!sheetName.trim().equals("")) {
sheet = workbook.getSheet(sheetName);// 如果指定sheet名,则取指定sheet中的内容.
}
if (sheet == null) {
sheet = workbook.getSheetAt(0); // 如果传入的sheet名不存在则默认指向第1个sheet.
}
int rows = sheet.getPhysicalNumberOfRows();
if (rows > 0) {// 有数据时才处理
// Field[] allFields = clazz.getDeclaredFields();// 得到类的所有field.
List<Field> allFields = getMappedFiled(clazz, null);
Map<Integer, Field> fieldsMap = new HashMap<Integer, Field>();// 定义一个map用于存放列的序号和field.
for (Field field : allFields) {
// 将有注解的field存放到map中.
if (field.isAnnotationPresent(ExcelVOAttribute.class)) {
ExcelVOAttribute attr = field.getAnnotation(ExcelVOAttribute.class);
int col = getExcelCol(attr.column());// 获得列号
maxCol = Math.max(col, maxCol);
// System.out.println(col + "====" + field.getName());
field.setAccessible(true);// 设置类的私有字段属性可访问.
fieldsMap.put(col, field);
}
}
for (int i = 1; i < rows; i++) {// 从第2行开始取数据,默认第一行是表头.
HSSFRow row = sheet.getRow(i);
// int cellNum = row.getPhysicalNumberOfCells();
// int cellNum = row.getLastCellNum();
int cellNum = maxCol;
T entity = null;
//System.err.println("cellNum="+cellNum);
for (int j = 0; j <= cellNum; j++) {
//System.err.println("j="+j);
if (row==null) {
continue;
}
HSSFCell cell = row.getCell(j);
if (cell == null) {
continue;
}
int cellType = cell.getCellType();
String c = "";
Integer val;
//System.err.println("cellType="+cellType);
if (cellType == HSSFCell.CELL_TYPE_NUMERIC) {
val=(int)cell.getNumericCellValue();
c = String.valueOf(val);
} else if (cellType == HSSFCell.CELL_TYPE_BOOLEAN) {
c = String.valueOf(cell.getBooleanCellValue());
} else {
c = cell.getStringCellValue();
}
//System.err.println("c="+c);
if (c == null || c.equals("")) {
continue;
}
entity = (entity == null ? clazz.newInstance() : entity);// 如果不存在实例则新建.
// System.out.println(cells[j].getContents());
Field field = fieldsMap.get(j);// 从map中得到对应列的field.
if (field == null) {
continue;
}
// 取得类型,并根据对象类型设置值.
Class<?> fieldType = field.getType();
//System.err.println("fieldType="+fieldType.toString());
if (String.class == fieldType) {
field.set(entity, String.valueOf(c));
} else if ((Integer.TYPE == fieldType) || (Integer.class == fieldType)) {
field.set(entity, Integer.valueOf(c));
} else if ((Long.TYPE == fieldType) || (Long.class == fieldType)) {
field.set(entity, Long.valueOf(c));
} else if ((Float.TYPE == fieldType) || (Float.class == fieldType)) {
field.set(entity, Float.valueOf(c));
} else if ((Short.TYPE == fieldType) || (Short.class == fieldType)) {
field.set(entity, Short.valueOf(c));
} else if ((Double.TYPE == fieldType) || (Double.class == fieldType)) {
field.set(entity, Double.valueOf(c));
} else if (Character.TYPE == fieldType) {
if ((c != null) && (c.length() > 0)) {
field.set(entity, Character.valueOf(c.charAt(0)));
}
}else{
System.out.println("未知的字段数据类型fieldType="+fieldType.getClass().toString());
}
}
if (entity != null) {
list.add(entity);
}
}
}
} catch (IOException e) {
e.printStackTrace();
} catch (InstantiationException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (IllegalArgumentException e) {
e.printStackTrace();
}
return list;
}
/**
* 对list数据源将其里面的数据导入到excel表单
*
* @param sheetName
* 工作表的名称
* @param output
* java输出流
*/
@SuppressWarnings("resource")
public boolean exportExcel(List<T> lists[], String sheetNames[], OutputStream output) {
if (lists.length != sheetNames.length) {
System.out.println("数组长度不一致");
return false;
}
HSSFWorkbook workbook = new HSSFWorkbook();// 产生工作薄对象
for (int ii = 0; ii < lists.length; ii++) {
List<T> list = lists[ii];
String sheetName = sheetNames[ii];
List<Field> fields = getMappedFiled(clazz, null);
HSSFSheet sheet = workbook.createSheet();// 产生工作表对象
workbook.setSheetName(ii, sheetName);
HSSFRow row;
HSSFCell cell;// 产生单元格
HSSFCellStyle style = workbook.createCellStyle();
style.setFillForegroundColor(HSSFColor.SKY_BLUE.index);
style.setFillBackgroundColor(HSSFColor.GREY_40_PERCENT.index);
row = sheet.createRow(0);// 产生一行
// 写入各个字段的列头名称
for (int i = 0; i < fields.size(); i++) {
Field field = fields.get(i);
ExcelVOAttribute attr = field.getAnnotation(ExcelVOAttribute.class);
int col = getExcelCol(attr.column());// 获得列号
cell = row.createCell(col);// 创建列
cell.setCellType(HSSFCell.CELL_TYPE_STRING);// 设置列中写入内容为String类型
cell.setCellValue(attr.name());// 写入列名
// 如果设置了提示信息则鼠标放上去提示.
if (!attr.prompt().trim().equals("")) {
setHSSFPrompt(sheet, "", attr.prompt(), 1, 100, col, col);// 这里默认设了2-101列提示.
}
// 如果设置了combo属性则本列只能选择不能输入
if (attr.combo().length > 0) {
setHSSFValidation(sheet, attr.combo(), 1, 100, col, col);// 这里默认设了2-101列只能选择不能输入.
}
cell.setCellStyle(style);
}
int startNo = 0;
int endNo = list.size();
// 写入各条记录,每条记录对应excel表中的一行
for (int i = startNo; i < endNo; i++) {
row = sheet.createRow(i + 1 - startNo);
T vo = (T) list.get(i); // 得到导出对象.
for (int j = 0; j < fields.size(); j++) {
Field field = fields.get(j);// 获得field.
field.setAccessible(true);// 设置实体类私有属性可访问
ExcelVOAttribute attr = field.getAnnotation(ExcelVOAttribute.class);
try {
// 根据ExcelVOAttribute中设置情况决定是否导出,有些情况需要保持为空,希望用户填写这一列.
if (attr.isExport()) {
cell = row.createCell(getExcelCol(attr.column()));// 创建cell
cell.setCellType(HSSFCell.CELL_TYPE_STRING);
cell.setCellValue(field.get(vo) == null ? "" : String.valueOf(field.get(vo)));// 如果数据存在就填入,不存在填入空格.
}
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
}
}
}
}
try {
output.flush();
workbook.write(output);
output.close();
return true;
} catch (IOException e) {
e.printStackTrace();
System.out.println("Output is closed ");
return false;
}
}
/**
* 对list数据源将其里面的数据导入到excel表单
*
* @param sheetName
* 工作表的名称
* @param sheetSize
* 每个sheet中数据的行数,此数值必须小于65536
* @param output
* java输出流
*/
@SuppressWarnings("unchecked")
public boolean exportExcel(List<T> list, String sheetName, OutputStream output) {
// 此处 对类型进行转换
List<T> ilist = new ArrayList<>();
for (T t : list) {
ilist.add(t);
}
List<T>[] lists = new ArrayList[1];
lists[0] = ilist;
String[] sheetNames = new String[1];
sheetNames[0] = sheetName;
return exportExcel(lists, sheetNames, output);
}
/**
* 将EXCEL中A,B,C,D,E列映射成0,1,2,3
*
* @param col
*/
public static int getExcelCol(String col) {
col = col.toUpperCase();
// 从-1开始计算,字母重1开始运算。这种总数下来算数正好相同。
int count = -1;
char[] cs = col.toCharArray();
for (int i = 0; i < cs.length; i++) {
count += (cs[i] - 64) * Math.pow(26, cs.length - 1 - i);
}
return count;
}
/**
* 设置单元格上提示
*
* @param sheet
* 要设置的sheet.
* @param promptTitle
* 标题
* @param promptContent
* 内容
* @param firstRow
* 开始行
* @param endRow
* 结束行
* @param firstCol
* 开始列
* @param endCol
* 结束列
* @return 设置好的sheet.
*/
public static HSSFSheet setHSSFPrompt(HSSFSheet sheet, String promptTitle, String promptContent, int firstRow, int endRow, int firstCol, int endCol) {
// 构造constraint对象
DVConstraint constraint = DVConstraint.createCustomFormulaConstraint("DD1");
// 四个参数分别是：起始行、终止行、起始列、终止列
CellRangeAddressList regions = new CellRangeAddressList(firstRow, endRow, firstCol, endCol);
// 数据有效性对象
HSSFDataValidation data_validation_view = new HSSFDataValidation(regions, constraint);
data_validation_view.createPromptBox(promptTitle, promptContent);
sheet.addValidationData(data_validation_view);
return sheet;
}
/**
* 设置某些列的值只能输入预制的数据,显示下拉框.
*
* @param sheet
* 要设置的sheet.
* @param textlist
* 下拉框显示的内容
* @param firstRow
* 开始行
* @param endRow
* 结束行
* @param firstCol
* 开始列
* @param endCol
* 结束列
* @return 设置好的sheet.
*/
public static HSSFSheet setHSSFValidation(HSSFSheet sheet, String[] textlist, int firstRow, int endRow, int firstCol, int endCol) {
// 加载下拉列表内容
DVConstraint constraint = DVConstraint.createExplicitListConstraint(textlist);
// 设置数据有效性加载在哪个单元格上,四个参数分别是：起始行、终止行、起始列、终止列
CellRangeAddressList regions = new CellRangeAddressList(firstRow, endRow, firstCol, endCol);
// 数据有效性对象
HSSFDataValidation data_validation_list = new HSSFDataValidation(regions, constraint);
sheet.addValidationData(data_validation_list);
return sheet;
}
/**
* 得到实体类所有通过注解映射了数据表的字段
*
* @param map
* @return
*/
@SuppressWarnings("rawtypes")
private List<Field> getMappedFiled(Class clazz, List<Field> fields) {
if (fields == null) {
fields = new ArrayList<Field>();
}
Field[] allFields = clazz.getDeclaredFields();// 得到所有定义字段
// 得到所有field并存放到一个list中.
for (Field field : allFields) {
if (field.isAnnotationPresent(ExcelVOAttribute.class)) {
fields.add(field);
}
}
if (clazz.getSuperclass() != null && !clazz.getSuperclass().equals(Object.class)) {
getMappedFiled(clazz.getSuperclass(), fields);
}
return fields;
}
public static void main(String[] args) {
// 初始化数据
List<StudentVO> list = new ArrayList<StudentVO>();
StudentVO vo = new StudentVO();
vo.setId(1);
vo.setName("李坤");
vo.setAge(26);
vo.setClazz("五期提高班");
vo.setCompany("天融信");
list.add(vo);
FileOutputStream out = null;
try {
out = new FileOutputStream("G:\\success3.xls");
} catch (FileNotFoundException e) {
e.printStackTrace();
}
ExcelUtil<StudentVO> util = new ExcelUtil<StudentVO>(StudentVO.class);// 创建工具类.
util.exportExcel(list, "学生信息", out);// 导出
System.out.println("----执行完毕----------");
}
}
html
1.
<form id="upload" class="batchImport fr" enctype="multipart/form-data" method="post">
<div class="row cl">
<div class="formControls col-5">
<input name="excelPath" id="excelPath" type="file" accept="application/msexcel" />
</div>
<div class="col-4"></div>
</div>
<div class="row cl mt-30 mb-30">
<div class="col-6 col-offset-3">
<input type="button" class="fr btn btn-primary radius" id="importExcel" value="导入"/>
<input class="btn btn-default layer_cloce" type="button" value=" 取消 ">
</div>
</div>
</form>
js
$(function () {
$("#importExcel").bind("click",function(){
debugger;
var excelPath = $("#excelPath").val();
var roomId=$("#roomId").val();
if(excelPath == null || excelPath == ''){
alert("请选择要上传的Excel文件");
return;
}else{
var fileExtend = excelPath.substring(excelPath.lastIndexOf('.')).toLowerCase();
if(fileExtend == '.xls'){
$("#upload").ajaxSubmit({
url:"${ctx}/admin/position/import.action?roomId=roomId",
success: function(ret) {
layer.msg(ret.msg);
parent.window.location.reload();
$('#upload')[0].reset()
},
error:function(ret){
layer.msg(ret.msg);
alert("error");
$('#upload')[0].reset()
}
});
}else{
alert("文件格式需为'.xls'格式");
return;
}
}
});
});
Controller
@RequestMapping("/import")
@ResponseBody
public CommonStatus importExcel(@RequestParam(value = "excelPath", required = false) MultipartFile file, HttpServletRequest request, HttpServletResponse response,String roomId) {
String test=roomId;
boolean isAllow = false;
String fileName = file.getOriginalFilename();
int index = fileName.lastIndexOf(".");
if (index < 0) {
return faile("非法文件");
}
String suffux = fileName.substring(index);
for (String s : WebConstant.ALLOW_IMPORT) {
if (s.equals(suffux)) {
isAllow = true;
break;
}
}
if (!isAllow) {
return faile("非法文件");
}
int num = 0;
try {
FileInputStream fis = (FileInputStream) file.getInputStream();
ExcelUtil<Position> util = new ExcelUtil<Position>(Position.class);
List<Position> list = util.importExcel("Sheet1", fis);
for (Position p : list) {
if (p == null) {
continue;
}
//判断文件名称是否已经有了
// 写入文件
p.setId(UUID.randomUUID().toString().substring(5));
//如果导入的这张表关联了其他表，可以做如下操作
if(StringUtils.isNotEmpty(roomId)){
Room room=roomService.selectById(roomId);
p.setRoomId(roomId);
}
int i = service.insertSelective(p);
num += i;
}
} catch (IOException e) {
log.info("导入excel异常e={}", e);
return faile("导入异常");
}
log.info("成功导入数据行数：" + num);
String path = request.getSession().getServletContext().getRealPath("excel");
SimpleDateFormat sdf = new SimpleDateFormat("/yyyy/MM/dd/");
String urlnew = sdf.format(new Date());
fileName = urlnew + fileName;
File targetFile = new File(path, fileName);
if (!targetFile.exists()) {
targetFile.mkdirs();
}
// 保存
try {
file.transferTo(targetFile);
} catch (Exception e) {
e.printStackTrace();
log.error("保存文件失败e=", e);
}
return success("导入成功");
}
实体
package com.jdy.model;
import com.jdy.core.model.BaseEntity;
import com.jdy.core.util.ExcelVOAttribute;
import org.apache.commons.lang.builder.ToStringBuilder;
import org.apache.commons.lang.builder.ToStringStyle;
import java.util.Date;
@SuppressWarnings("serial")
public class Position extends BaseEntity {
@ExcelVOAttribute(name = "工位", column = "A")
private String no;
@ExcelVOAttribute(name = "桌号", column = "B")
private String deskNo;
@ExcelVOAttribute(name = "椅号", column = "C")
private String chairNo;
public String getNo() {
return no;
}
public void setNo(String no) {
this.no = no;
}
public String getDeskNo() {
return deskNo;
}
public void setDeskNo(String deskNo) {
this.deskNo = deskNo;
}
public String getChairNo() {
return chairNo;
}
public void setChairNo(String chairNo) {
this.chairNo = chairNo;
}
}
1.