java使用POI进行Excel读写

1 jar包下载

　　参考链接：http://www.cnblogs.com/gmq/archive/0001/01/01/1521496.html

　　poi-3.7-20101029.jar和源码下载地址：http://pan.baidu.com/s/1sjNmnc5#path=%252F04technology%252F01J2EE%252Fjar

2 ExcelHelper类

package zjr.amy.excel;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Date;
import java.util.List;

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;

/**
* Excel帮助类
*
* @author zhujinrong
*
*/
public class ExcelHelper {

/**
* 读取Excel内容
*
* @param fileName
*            文件名和路径
* @param ignoreRows
*            忽略读取的行数
* @return 数据
* @throws FileNotFoundException
*             找不到文件
* @throws IOException
*             输入输出异常
*/
public static String[][] getData(String fileName, int ignoreRows)
throws FileNotFoundException, IOException {
File file = new File(fileName);
List<String[]> result = new ArrayList<String[]>();
int rowSize = 0;
BufferedInputStream in = new BufferedInputStream(new FileInputStream(
file));
POIFSFileSystem fs = new POIFSFileSystem(in);
HSSFWorkbook workbook = new HSSFWorkbook(fs);
HSSFCell cell = null;
for (int sheetIndex = 0; sheetIndex < workbook.getNumberOfSheets(); sheetIndex++) {

// 可能有多个sheet
HSSFSheet sheet = workbook.getSheetAt(sheetIndex);
for (int rowIndex = ignoreRows; rowIndex < sheet.getLastRowNum(); rowIndex++) {
HSSFRow row = sheet.getRow(rowIndex);
if (row == null) {
continue;
}

// 获取行数
int tempRowSize = row.getLastCellNum() + 1;
if (tempRowSize > rowSize) {
rowSize = tempRowSize;
}

String[] values = new String[rowSize];
Arrays.fill(values, "");
boolean hasValue = false;
for (int collumnIndex = 0; collumnIndex <= row.getLastCellNum(); collumnIndex++) {
String value = "";
cell = row.getCell(collumnIndex);
if (cell != null) {
switch (cell.getCellType()) {
case HSSFCell.CELL_TYPE_STRING:
value = cell.getStringCellValue();
break;
case HSSFCell.CELL_TYPE_NUMERIC:
if (HSSFDateUtil.isCellDateFormatted(cell)) {
Date date = cell.getDateCellValue();
if (date != null) {
value = new SimpleDateFormat("yyyy-MM-dd")
.format(date);
} else {
value = "";
}
} else {
double d = cell.getNumericCellValue();
value = d + "";
}
break;
case HSSFCell.CELL_TYPE_FORMULA:
if (!cell.getStringCellValue().equals("")) {
value = cell.getStringCellValue();
} else {
value = cell.getNumericCellValue() + "";
}
break;
case HSSFCell.CELL_TYPE_BLANK:
break;
case HSSFCell.CELL_TYPE_ERROR:
break;
case HSSFCell.CELL_TYPE_BOOLEAN:
value = (cell.getBooleanCellValue() == true ? "Y"
: "N");
break;
default:
value = "";
}
if (collumnIndex == 0 && value.trim().equals("")) {
break;
}
values[collumnIndex] = value.trim();
hasValue = true;
}
}
if (hasValue) {
result.add(values);
}
}
}

in.close();
String[][] returnArray = new String[result.size()][rowSize];
for (int i = 0; i < returnArray.length; i++) {
returnArray[i] = (String[]) result.get(i);
}

return returnArray;
}

/**
* 写Excel数据
*
* @param fileName
*            文件名
* @param data
*            数据
* @param sheetName
*            sheet名字
* @throws IOException
*             输入输出异常
*/
public static void setData(String fileName, String[][] data,
String sheetName) throws IOException {
FileOutputStream fos = new FileOutputStream(fileName);
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet s = wb.createSheet();
wb.setSheetName(0, sheetName);
if (data != null && data.length > 0) {
for (int i = 0; i < data.length; i++) {
// 创建第i行
HSSFRow row = s.createRow(i);
for (int j = 0; j < data[i].length; j++) {
// 第i行第j列的数据
HSSFCell cell = row.createCell(j);
cell.setCellValue(data[i][j]);
}
}
}

// 写入工作薄
wb.write(fos);

// 关闭输出流
fos.close();
}
}

3 TestExcelHelper类

package zjr.amy.excel.test;

import java.io.FileNotFoundException;
import java.io.IOException;

import zjr.amy.excel.ExcelHelper;

public class TestExcelHelper {

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
TestGetData();
}

/**
* 测试获取数据
*/
public static void TestGetData() {
try {
String[][] array = ExcelHelper.getData("D:/001code/100java学习/JavaUtil/doc/税费管理20141105100144.xls", 0);

if (array != null && array.length > 0){
for(int i = 0; i < array.length; i++){
System.out.print(i + ": ");
for(int j = 0; j < array[i].length; j ++){
System.out.print(array[i][j] + " ");
}
System.out.println();
}

setData(array, "税费信息");
}

} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

/**
* 测试写入数据
* @param data 数据
* @param sheetName sheet名称
*/
public static void setData(String [][] data, String sheetName){
String fileName="D:/001code/100java学习/JavaUtil/doc/税费管理20141105100144Copy.xls";
try {
ExcelHelper.setData(fileName, data, sheetName);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}

4 测试结果



　　1-1 待读取文件内容（D:\001code\100java学习\JavaUtil\doc\税费管理20141105100144.xls）



　　图1-2 显示读取税费管理20141105100144.xls文件内容



　　1-3 写入文件内容（D:\001code\100java学习\JavaUtil\doc\税费管理20141105100144Copy.xls）

5 git地址

　　https://github.com/HelloAmy/JavaStudy.git