Java讀取Excel內容

藉助於apathe的poi.jar，由於上傳文件不支持.jar所以請下載後將文件改爲.jar，在應用程序中添加poi.jar包，並將需要讀取的excel文件放入根目錄即可

本例使用java來讀取excel的內容並展出出結果，代碼如下：

import java.io.BufferedInputStream;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.IOException;

import java.text.DecimalFormat;

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;

importorg.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;


publicclass ExcelOperate {


publicstaticvoid main(String[] args)throws Exception {

File file = new File("ExcelDemo.xls");

String[][] result = getData(file, 1);

int rowLength = result.length;

for(int i=0;i<rowLength;i++) {

for(int j=0;j<result[i].length;j++) {

System.out.print(result[i][j]+"\t\t");

}

System.out.println();

}


}

/**

*讀取Excel的內容，第一維數組存儲的是一行中格列的值，二維數組存儲的是多少個行

*@paramfile讀取數據的源Excel

*@paramignoreRows讀取數據忽略的行數，比喻行頭不需要讀入忽略的行數爲1

*@return讀出的Excel中數據的內容

*@throwsFileNotFoundException

*@throwsIOException

*/

publicstatic String[][] getData(File file,int ignoreRows)

throws FileNotFoundException, IOException {

List<String[]> result = new ArrayList<String[]>();

int rowSize = 0;

BufferedInputStream in = new BufferedInputStream(new FileInputStream(

file));

// 打開HSSFWorkbook

POIFSFileSystem fs = new POIFSFileSystem(in);

HSSFWorkbook wb = new HSSFWorkbook(fs);

HSSFCell cell = null;

for (int sheetIndex = 0; sheetIndex < wb.getNumberOfSheets(); sheetIndex++) {

HSSFSheet st = wb.getSheetAt(sheetIndex);

// 第一行爲標題，不取

for (int rowIndex = ignoreRows; rowIndex <= st.getLastRowNum(); rowIndex++) {

HSSFRow row = st.getRow(rowIndex);

if (row ==null) {

continue;

}

int tempRowSize = row.getLastCellNum() + 1;

if (tempRowSize > rowSize) {

rowSize = tempRowSize;

}

String[] values = new String[rowSize];

Arrays.fill(values, "");

boolean hasValue =false;

for (short columnIndex = 0; columnIndex <= row.getLastCellNum(); columnIndex++) {

String value = "";

cell = row.getCell(columnIndex);

if (cell !=null) {

// 注意：一定要設成這個，否則可能會出現亂碼

cell.setEncoding(HSSFCell.ENCODING_UTF_16);

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 {

value = new DecimalFormat("0").format(cell

.getNumericCellValue());

}

break;

case HSSFCell.CELL_TYPE_FORMULA:

// 導入時如果爲公式生成的數據則無值

if (!cell.getStringCellValue().equals("")) {

value = cell.getStringCellValue();

} else {

value = cell.getNumericCellValue() + "";

}

break;

case HSSFCell.CELL_TYPE_BLANK:

break;

case HSSFCell.CELL_TYPE_ERROR:

value = "";

break;

case HSSFCell.CELL_TYPE_BOOLEAN:

value = (cell.getBooleanCellValue() == true ?"Y"

: "N");

break;

default:

value = "";

}

}

if (columnIndex == 0 && value.trim().equals("")) {

break;

}

values[columnIndex] = rightTrim(value);

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;

}


/**

*去掉字符串右邊的空格

*@paramstr要處理的字符串

*@return處理後的字符串

*/

publicstatic String rightTrim(String str) {

if (str ==null) {

return"";

}

int length = str.length();

for (int i = length - 1; i >= 0; i--) {

if (str.charAt(i) != 0x20) {

break;

}

length--;

}

return str.substring(0, length);

}

}