JAVA读写EXCEL

本文主要向你演示如何使用JavaExcel API来读写Excel文件。关于JavaExcel API，这是一个开源的lib库。其相关的feature如下：

* 支持Excel 95, 97, 2000, XP, 2003 的制表页。
* 可以读写相关的Excel公式 （仅支持Excel 97 及以后版本）
* 可以生成 Excel 2000 格式的xls文件。
* 支持字体，数字和日期格式。
* 支持单元格的阴影，边框和颜色。
* 可以修改已存在的制表页。
* 国际化多语言集。(公式目前支持，英文，法文，西班牙文和德文）
* 支持图表拷贝。
* 支持图片的插入和复制。
* 日志生成可以使用Jakarta Commons Logging, log4j, JDK 1.4 Logger, 等。
* 更多……
* 你可以在这里下载：http://jexcelapi.sourceforge.net/，然后，把jxl.jar加到你的Java的classpath中。
* 下面是两段例程，一段是如何创建Excel，一段是如何读取Excel。
* 创建Excel
* `package writer;

import java.io.File;
import java.io.IOException;
import java.util.Locale;

import jxl.CellView;
import jxl.Workbook;
import jxl.WorkbookSettings;
import jxl.format.UnderlineStyle;
import jxl.write.Formula;
import jxl.write.Label;
import jxl.write.Number;
import jxl.write.WritableCellFormat;
import jxl.write.WritableFont;
import jxl.write.WritableSheet;
import jxl.write.WritableWorkbook;
import jxl.write.WriteException;
import jxl.write.biff.RowsExceededException;

public class WriteExcel {

private WritableCellFormat timesBoldUnderline;
private WritableCellFormat times;
private String inputFile;

public void setOutputFile(String inputFile) {
this.inputFile = inputFile;
}

public void write() throws IOException, WriteException {
    File file = new File(inputFile);
    WorkbookSettings wbSettings = new WorkbookSettings();

    wbSettings.setLocale(new Locale("en", "EN"));

    WritableWorkbook workbook = Workbook.createWorkbook(file, wbSettings);
    workbook.createSheet("Report", 0);
    WritableSheet excelSheet = workbook.getSheet(0);
    createLabel(excelSheet);
    createContent(excelSheet);

    workbook.write();
    workbook.close();
}

private void createLabel(WritableSheet sheet)
        throws WriteException {
    // Lets create a times font
    WritableFont times10pt = new WritableFont(WritableFont.TIMES, 10);
    // Define the cell format
    times = new WritableCellFormat(times10pt);
    // Lets automatically wrap the cells
    times.setWrap(true);

    // Create create a bold font with unterlines
    WritableFont times10ptBoldUnderline = new WritableFont(
            WritableFont.TIMES, 10, WritableFont.BOLD, false,
            UnderlineStyle.SINGLE);
    timesBoldUnderline = new WritableCellFormat(times10ptBoldUnderline);
    // Lets automatically wrap the cells
    timesBoldUnderline.setWrap(true);

    CellView cv = new CellView();
    cv.setFormat(times);
    cv.setFormat(timesBoldUnderline);
    cv.setAutosize(true);

    // Write a few headers
    addCaption(sheet, 0, 0, "Header 1");
    addCaption(sheet, 1, 0, "This is another header");


}

private void createContent(WritableSheet sheet) throws WriteException,
        RowsExceededException {
    // Write a few number
    for (int i = 1; i < 10; i++) {
        // First column
        addNumber(sheet, 0, i, i + 10);
        // Second column
        addNumber(sheet, 1, i, i * i);
    }
    // Lets calculate the sum of it
    StringBuffer buf = new StringBuffer();
    buf.append("SUM(A2:A10)");
    Formula f = new Formula(0, 10, buf.toString());
    sheet.addCell(f);
    buf = new StringBuffer();
    buf.append("SUM(B2:B10)");
    f = new Formula(1, 10, buf.toString());
    sheet.addCell(f);

    // Now a bit of text
    for (int i = 12; i < 20; i++) {
        // First column
        addLabel(sheet, 0, i, "Boring text " + i);
        // Second column
        addLabel(sheet, 1, i, "Another text");
    }
}

private void addCaption(WritableSheet sheet, int column, int row, String s)
        throws RowsExceededException, WriteException {
    Label label;
    label = new Label(column, row, s, timesBoldUnderline);
    sheet.addCell(label);
}

private void addNumber(WritableSheet sheet, int column, int row,
        Integer integer) throws WriteException, RowsExceededException {
    Number number;
    number = new Number(column, row, integer, times);
    sheet.addCell(number);
}

private void addLabel(WritableSheet sheet, int column, int row, String s)
        throws WriteException, RowsExceededException {
    Label label;
    label = new Label(column, row, s, times);
    sheet.addCell(label);
}

public static void main(String[] args) throws WriteException, IOException {
    WriteExcel test = new WriteExcel();
    test.setOutputFile("c:/temp/lars.xls");
    test.write();
    System.out
            .println("Please check the result file under c:/temp/lars.xls ");
}

}`

* 读取Excel

package reader;

import java.io.File;
import java.io.IOException;

import jxl.Cell;
import jxl.CellType;
import jxl.Sheet;
import jxl.Workbook;
import jxl.read.biff.BiffException;

public class ReadExcel {

    private String inputFile;

    public void setInputFile(String inputFile) {
        this.inputFile = inputFile;
    }

    public void read() throws IOException  {
        File inputWorkbook = new File(inputFile);
        Workbook w;
        try {
            w = Workbook.getWorkbook(inputWorkbook);
            // Get the first sheet
            Sheet sheet = w.getSheet(0);
            // Loop over first 10 column and lines

            for (int j = 0; j < sheet.getColumns(); j++) {
                for (int i = 0; i < sheet.getRows(); i++) {
                    Cell cell = sheet.getCell(j, i);
                    CellType type = cell.getType();
                    if (cell.getType() == CellType.LABEL) {
                        System.out.println("I got a label "
                                + cell.getContents());
                    }

                    if (cell.getType() == CellType.NUMBER) {
                        System.out.println("I got a number "
                                + cell.getContents());
                    }

                }
            }
        } catch (BiffException e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) throws IOException {
        ReadExcel test = new ReadExcel();
        test.setInputFile("c:/temp/lars.xls");
        test.read();
    }

}