Question

已知道Excel文件的密码，用JAVA如何读取？我原来用的是jxcell 但是这个包是收费的 有什么可以替换这个的吗

Answer 1

借助于apathe的poi.jar，由于上传文件不支持.jar所以请下载后将文件改为.jar，在应用程序中添加poi.jar包，并将需要读取的excel文件放入根目录即可

本例使用java来读取excel的内容并展出出结果，代码如下：

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;

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;

public class ExcelOperate {

public static void 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();

}

}

/**

* 读取Excel的内容，第一维数组存储的是一行中格列的值，二维数组存储的是多少个行

* @param file 读取数据的源Excel

* @param ignoreRows 读取数据忽略的行数，比喻行头不需要读入 忽略的行数为1

* @return 读出的Excel中数据的内容

* @throws FileNotFoundException

* @throws IOException

*/

public static 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));

// 打开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);

// 第一行为标题，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：一定要设成这个，否则可能会出现乱码

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:

// 导入时如果为公式生成的数据则无值

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;

}

/**

* 去掉字符串右边的空格

* @param str 要处理的字符串

* @return 处理后的字符串

*/

public static 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);

}

}

Answer 2

jxl.jar

追问

jxl能读取受保护的Excel么？根本就读不了工作簿啊？