POI

Java读写Excel之POI超入门 http://rensanning.iteye.com/blog/1538591
java的poi技术读取和导入Excel [非2010]http://www.cnblogs.com/hongten/archive/2012/02/22/java2poi.html
可以根据这个修改成2010的，里面有读取和创建
Apache POI组件操作Excel，制作报表（二） http://zjkilly.iteye.com/blog/870309
java 操作 excel 2010 http://blog.csdn.net/dallas16/article/details/6954264
poi excel 获取列名 http://skying007.iteye.com/blog/1680436
Excel导入异常Cannot get a text value from a numeric cell解决 http://blog.csdn.net/ysughw/article/details/9288307
POI颜色索引 http://www.cnblogs.com/xy2401/p/3295965.html

<dependencies>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>3.10-beta2</version>
            <!--<version>3.9</version>-->
        </dependency>

        <dependency>
            <groupId>org.apache.xmlbeans</groupId>
            <artifactId>xmlbeans</artifactId>
            <version>2.6.0</version>
        </dependency>

        <dependency>
            <groupId>dom4j</groupId>
            <artifactId>dom4j</artifactId>
            <version>1.6.1</version>
        </dependency>

        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>ooxml-schemas</artifactId>
            <version>1.1</version>
        </dependency>
    </dependencies>

读取：

package com.pandy.excel;


import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

import java.io.FileInputStream;
import java.io.InputStream;
import java.util.List;
import java.util.Map;

/**
 * Created by pandy on 13-12-29.
 */
public class ExcelProcess {


    public void process(String path, Map<String, Object> paramters, int startRow, int endRow, int startCol, int endCol) {
        try {
            InputStream is = new FileInputStream("/mnt/E/a.xlsx");
            XSSFWorkbook workbook = new XSSFWorkbook(is);
            // 循环工作表Sheet
            for (int numSheet = 0; numSheet < workbook.getNumberOfSheets(); numSheet++) {
                XSSFSheet sheet = workbook.getSheetAt(numSheet);
                if (sheet == null) {
                    continue;
                }
                // 循环行Row
                for (int i = 0; i <= sheet.getLastRowNum(); i++) {
                    XSSFRow row = sheet.getRow(i);
                    if (row == null) {
                        continue;
                    }

                    int colNum = row.getLastCellNum();
                    for(int j=0; j<colNum; j++){
                        XSSFCell xh = row.getCell(j);
                        if (xh != null){
                            row.getCell(j).setCellType(Cell.CELL_TYPE_STRING);
                            System.out.print(xh.getStringCellValue()+"    ");
                        }
                    }
                    System.out.println("\n-----------------------------");

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

    public static void main(String[] args) {
        ExcelProcess process = new ExcelProcess();
        process.process(null, null,0,0,0,0);
    }

}

修改：
别人的提示：修改文件最后还需要通过IO流操作来保存更改，这其实是很关键的一步，你代码里面没有IO的关闭操作，导致了数据的修改没有保存

private void outExcel(String path){
        try {
            InputStream is = new FileInputStream(path);
            XSSFWorkbook workbook = new XSSFWorkbook(is);
            //XSSFWorkbook workbook = new XSSFWorkbook(path);
            XSSFSheet sheet = workbook.createSheet("newSheet");

            XSSFRow firstrow = sheet.createRow(0);
            XSSFCell[] firstcell = new XSSFCell[3];
            String[] names = new String[]{"AAA","BBB","CCC"};
            for (int j = 0; j < 3; j++) {
                firstcell[j] = firstrow.createCell(j);
                firstcell[j].setCellValue(names[j]);
            }
            is.close();

            FileOutputStream fileOut = new FileOutputStream(path);
            workbook.write(fileOut);
            fileOut.close();


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