本文目录一览:

poi读取Excel,之后生成另一个Excel

File fi=new File("D://20110221144419.xls");

System.out.println(11);

//创建一个工作薄

POIFSFileSystem fs=new POIFSFileSystem(new FileInputStream(fi));

HSSFWorkbook wb=new HSSFWorkbook(fs);

int i = 0;

HSSFSheet hsheet = wb.getSheetAt(i);

if(hsheet==null)

hsheet = wb.createSheet("Sheet"+(i)+"");

HSSFPatriarch patriarch = hsheet.createDrawingPatriarch();

HSSFClientAnchor anchor = new HSSFClientAnchor(0,0,512,255,(short) 1,1,(short)10,20);

patriarch.createPicture(anchor , wb.addPicture(byteArrayOut.toByteArray(),HSSFWorkbook.PICTURE_TYPE_JPEG));

fileOut= new FileOutputStream(fi);

//写入excel文件

wb.write(fileOut);

fileOut.close();

POI 读取excel

直接上源码:

package edu.sjtu.erplab.poi;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.IOException;

import java.io.InputStream;

import java.text.SimpleDateFormat;

import java.util.Date;

import java.util.HashMap;

import java.util.Map;

import org.apache.poi.hssf.usermodel.HSSFCell;

import org.apache.poi.hssf.usermodel.HSSFDateUtil;

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.POIFSFileSystem;

/**

* 操作Excel表格的功能类

*/

public class ExcelReader {

private POIFSFileSystem fs;

private HSSFWorkbook wb;

private HSSFSheet sheet;

private HSSFRow row;

/**

* 读取Excel表格表头的内容

* @param InputStream

* @return String 表头内容的数组

*/

public String[] readExcelTitle(InputStream is) {

try {

fs = new POIFSFileSystem(is);

wb = new HSSFWorkbook(fs);

} catch (IOException e) {

e.printStackTrace();

}

sheet = wb.getSheetAt(0);

row = sheet.getRow(0);

// 标题总列数

int colNum = row.getPhysicalNumberOfCells();

System.out.println("colNum:" + colNum);

String[] title = new String[colNum];

for (int i = 0; i colNum; i++) {

//title[i] = getStringCellValue(row.getCell((short) i));

title[i] = getCellFormatValue(row.getCell((short) i));

}

return title;

}

/**

* 读取Excel数据内容

* @param InputStream

* @return Map 包含单元格数据内容的Map对象

*/

public MapInteger, String readExcelContent(InputStream is) {

MapInteger, String content = new HashMapInteger, String();

String str = "";

try {

fs = new POIFSFileSystem(is);

wb = new HSSFWorkbook(fs);

} catch (IOException e) {

e.printStackTrace();

}

sheet = wb.getSheetAt(0);

// 得到总行数

int rowNum = sheet.getLastRowNum();

row = sheet.getRow(0);

int colNum = row.getPhysicalNumberOfCells();

// 正文内容应该从第二行开始,第一行为表头的标题

for (int i = 1; i = rowNum; i++) {

row = sheet.getRow(i);

int j = 0;

while (j colNum) {

// 每个单元格的数据内容用"-"分割开,以后需要时用String类的replace()方法还原数据

// 也可以将每个单元格的数据设置到一个javabean的属性中,此时需要新建一个javabean

// str += getStringCellValue(row.getCell((short) j)).trim() +

// "-";

str += getCellFormatValue(row.getCell((short) j)).trim() + " ";

j++;

}

content.put(i, str);

str = "";

}

return content;

}

/**

* 获取单元格数据内容为字符串类型的数据

*

* @param cell Excel单元格

* @return String 单元格数据内容

*/

private String getStringCellValue(HSSFCell cell) {

String strCell = "";

switch (cell.getCellType()) {

case HSSFCell.CELL_TYPE_STRING:

strCell = cell.getStringCellValue();

break;

case HSSFCell.CELL_TYPE_NUMERIC:

strCell = String.valueOf(cell.getNumericCellValue());

break;

case HSSFCell.CELL_TYPE_BOOLEAN:

strCell = String.valueOf(cell.getBooleanCellValue());

break;

case HSSFCell.CELL_TYPE_BLANK:

strCell = "";

break;

default:

strCell = "";

break;

}

if (strCell.equals("") || strCell == null) {

return "";

}

if (cell == null) {

return "";

}

return strCell;

}

/**

* 获取单元格数据内容为日期类型的数据

*

* @param cell

* Excel单元格

* @return String 单元格数据内容

*/

private String getDateCellValue(HSSFCell cell) {

String result = "";

try {

int cellType = cell.getCellType();

if (cellType == HSSFCell.CELL_TYPE_NUMERIC) {

Date date = cell.getDateCellValue();

result = (date.getYear() + 1900) + "-" + (date.getMonth() + 1)

+ "-" + date.getDate();

} else if (cellType == HSSFCell.CELL_TYPE_STRING) {

String date = getStringCellValue(cell);

result = date.replaceAll("[年月]", "-").replace("日", "").trim();

} else if (cellType == HSSFCell.CELL_TYPE_BLANK) {

result = "";

}

} catch (Exception e) {

System.out.println("日期格式不正确!");

e.printStackTrace();

}

return result;

}

/**

* 根据HSSFCell类型设置数据

* @param cell

* @return

*/

private String getCellFormatValue(HSSFCell cell) {

String cellvalue = "";

if (cell != null) {

// 判断当前Cell的Type

switch (cell.getCellType()) {

// 如果当前Cell的Type为NUMERIC

case HSSFCell.CELL_TYPE_NUMERIC:

case HSSFCell.CELL_TYPE_FORMULA: {

// 判断当前的cell是否为Date

if (HSSFDateUtil.isCellDateFormatted(cell)) {

// 如果是Date类型则,转化为Data格式

//方法1:这样子的data格式是带时分秒的:2011-10-12 0:00:00

//cellvalue = cell.getDateCellValue().toLocaleString();

//方法2:这样子的data格式是不带带时分秒的:2011-10-12

Date date = cell.getDateCellValue();

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

cellvalue = sdf.format(date);

}

// 如果是纯数字

else {

// 取得当前Cell的数值

cellvalue = String.valueOf(cell.getNumericCellValue());

}

break;

}

// 如果当前Cell的Type为STRIN

case HSSFCell.CELL_TYPE_STRING:

// 取得当前的Cell字符串

cellvalue = cell.getRichStringCellValue().getString();

break;

// 默认的Cell值

default:

cellvalue = " ";

}

} else {

cellvalue = "";

}

return cellvalue;

}

public static void main(String[] args) {

try {

// 对读取Excel表格标题测试

InputStream is = new FileInputStream("d://test2.xls");

ExcelReader excelReader = new ExcelReader();

String[] title = excelReader.readExcelTitle(is);

System.out.println("获得Excel表格的标题:");

for (String s : title) {

System.out.print(s + " ");

}

// 对读取Excel表格内容测试

InputStream is2 = new FileInputStream("d://test2.xls");

MapInteger, String map = excelReader.readExcelContent(is2);

System.out.println("获得Excel表格的内容:");

for (int i = 1; i = map.size(); i++) {

System.out.println(map.get(i));

}

} catch (FileNotFoundException e) {

System.out.println("未找到指定路径的文件!");

e.printStackTrace();

}

}

}

java中poi读取excel时报错:Unable to construct record instance,怎么解决呀?

根据你的截图,错误的可能有两个,要分别测试对应一下:

1、excel文档有问题,从截图下方看(就是乱码部分)可能excel文档的第1个sheet是个被删除的sheet,所以名称是很长的乱码,导致无法读取。

修改方法:创建一个新的excel文档,然后将需要的内容以文本的形式复制进去,再调用。

2、poi的问题,这个有可能是poi和excel的版本不对应。

修改方法:下载poi的时候确定清楚里面的hkec访问版本对应的是不是你的excel文件的版本。

Poi如何去读取excel文件

直接全部在action里面写的,这个就不多说了,直接上代码:

public String executeExcel() throws Exception{ String realPath = ServletActionContext.getServletContext().getRealPath("/fileupload");

System.out.println(fileFileName);

String filePath = "";

if(this.file!=null){

File saveFile = new File(new File(realPath),this.fileFileName);

filePath = realPath+"//"+this.fileFileName;

System.out.println(filePath);

if(!saveFile.getParentFile().exists()){

saveFile.getParentFile().mkdirs(); }

FileUtils.copyFile(file, saveFile); }

this.exlToDB(filePath);

ActionContext.getContext().put("message","导入成功");

return "success"; } //读取excel2007,并把数据插入数据库

public void exlToDB(String filePath){ boolean flag = true;

AllKpi akpi = new AllKpi(); try { // 文件流指向excel文件

FileInputStream fin=new FileInputStream(filePath);

XSSFWorkbook workbook = new XSSFWorkbook(fin);// 创建工作薄

XSSFSheet sheet = workbook.getSheetAt(0);// 得到工作表

XSSFRow row = null;// 对应excel的行

XSSFCell cell = null;// 对应excel的列

int totalRow = sheet.getLastRowNum();// 得到excel的总记录条数

System.out.println(totalRow); // 以下的字段一一对应数据库表的字段

float idd = 0.0f;

String id = "";

String Name = "";

String DEPT_NAME = "";

String Weight = "";

span/spanString ALGORITHM = "";

String text = " ";

//String sql = "insert into DSP_TJ_KPI values(DSP_TJ_KPI_SEQ.nextval,?,?,?,'无',?)";

for (int i = 1; i = totalRow; i++) {

row = sheet.getRow(i);

//System.out.println(row.getCell(0).toString());

if(row.getCell(0) != null !"".equals(row.getCell(0)) row.getCell(1) != null !"".equals(row.getCell(1)) row.getCell(2) != null !"".equals(row.getCell(2)) row.getCell(3) != null !"".equals(row.getCell(3))){

cell = row.getCell((short) 0);

Name = cell.toString();

System.out.println(Name);

cell = row.getCell((short) 1);

Weight = cell.toString();

System.out.println(Weight);

cell = row.getCell((short) 2);

DEPT_NAME = cell.toString();

System.out.println(DEPT_NAME);

cell = row.getCell((short) 3);

ALGORITHM = cell.toString();

System.out.println(ALGORITHM);

akpi.setAllkpiName(Name);

akpi.setAllkpiDeptName(DEPT_NAME);

akpi.setAllkpiWeight(Weight);

akpi.setAlgorithm(ALGORITHM);

akpi.setText(text);

allKpiService.addAllKpi(akpi); //以下注释代码为连接jdbc测试代码块

/*pst = con.prepareStatement(sql);

//pst.setString(1, student_id);

pst.setString

(1, DEPT_NAME);

pst.setString

(2, Name);

pst.setString

(3, Weight);

span/spanpst.setString(4, ALGORITHM);

pst.execute();*/

System.out.println("preparestatement successful"); } }

/*pst.close();

con.close();*/

fin.close(); } catch (FileNotFoundException e)

{

flag = false;

e.printStackTrace();

}

catch (IOException ex)

{

flag = false;

ex.printStackTrace();

}

poi解析excel表头不在一行

原因是POI导入Excel文件时,读取的数据少了一行。

如果是使用 XSSFSheet 对象来获取行数的话,那获取行数的方法应该是:

1.XSSFWorkbook xssfWorkbook = new XSSFWorkbook(is);

2.XSSFSheet xssfSheet = xssfWorkbook.getSheetAt(0);

3.int row = xssfSheet.getPhysicalNumberOfRows();

而不是使用int rows = xssfSheet.getLastRowNum();来获得行数。