（最近專案需要對excel進行操作，所以在網上找到了這篇博文，並且很好的應用到了專案中，在此做個記錄。）

這篇blog主要是講述java中poi讀取excel，而excel的版本包括：2003-2007和2010兩個版本， 即excel的字尾名為：xls和xlsx。

下面是本文的專案結構：

專案中所需要的jar檔案：

所用的Excel資料（2003-2007,2010都是一樣的資料）

執行效果：

原始碼部分：

=================================================

/Excel2010/src/com/b510/common/Common.java

/**
 * 
 */
package com.b510.common;

/**
 * @author Hongten
 * @created 2014-5-21
 */
public class Common {

    public static final String OFFICE_EXCEL_2003_POSTFIX = "xls";
    public static final String OFFICE_EXCEL_2010_POSTFIX = "xlsx";

    public static final String EMPTY = "";
    public static final
 
 String POINT = ".";
    public static final String LIB_PATH = "lib";
    public static final String STUDENT_INFO_XLS_PATH = LIB_PATH + "/student_info" + POINT + OFFICE_EXCEL_2003_POSTFIX;
    public static final String STUDENT_INFO_XLSX_PATH = LIB_PATH + "/student_info" + POINT + OFFICE_EXCEL_2010_POSTFIX;
    public
 
 static final String NOT_EXCEL_FILE = " : Not the Excel file!";
    public static final String PROCESSING = "Processing...";

}

/Excel2010/src/com/b510/excel/ReadExcel.java

/**
 * 
 */
package com.b510.excel;

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import org.apache.poi.hssf.usermodel.HSSFCell;
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.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 com.b510.common.Common;
import com.b510.excel.util.Util;
import com.b510.excel.vo.Student;

/**
 * @author Hongten
 * @created 2014-5-20
 */
public class ReadExcel {

    /**
     * read the Excel file
     * @param path the path of the Excel file
     * @return
     * @throws IOException
     */
    public List<Student> readExcel(String path) throws IOException {
        if (path == null || Common.EMPTY.equals(path)) {
            return null;
        } else {
            String postfix = Util.getPostfix(path);
            if (!Common.EMPTY.equals(postfix)) {
                if (Common.OFFICE_EXCEL_2003_POSTFIX.equals(postfix)) {
                    return readXls(path);
                } else if (Common.OFFICE_EXCEL_2010_POSTFIX.equals(postfix)) {
                    return readXlsx(path);
                }
            } else {
                System.out.println(path + Common.NOT_EXCEL_FILE);
            }
        }
        return null;
    }

    /**
     * Read the Excel 2010
     * @param path the path of the excel file
     * @return
     * @throws IOException
     */
    public List<Student> readXlsx(String path) throws IOException {
        System.out.println(Common.PROCESSING + path);
        InputStream is = new FileInputStream(path);
        XSSFWorkbook xssfWorkbook = new XSSFWorkbook(is);
        Student student = null;
        List<Student> list = new ArrayList<Student>();
        // Read the Sheet
        for (int numSheet = 0; numSheet < xssfWorkbook.getNumberOfSheets(); numSheet++) {
            XSSFSheet xssfSheet = xssfWorkbook.getSheetAt(numSheet);
            if (xssfSheet == null) {
                continue;
            }
            // Read the Row
            for (int rowNum = 1; rowNum <= xssfSheet.getLastRowNum(); rowNum++) {
                XSSFRow xssfRow = xssfSheet.getRow(rowNum);
                if (xssfRow != null) {
                    student = new Student();
                    XSSFCell no = xssfRow.getCell(0);
                    XSSFCell name = xssfRow.getCell(1);
                    XSSFCell age = xssfRow.getCell(2);
                    XSSFCell score = xssfRow.getCell(3);
                    student.setNo(getValue(no));
                    student.setName(getValue(name));
                    student.setAge(getValue(age));
                    student.setScore(Float.valueOf(getValue(score)));
                    list.add(student);
                }
            }
        }
        return list;
    }

    /**
     * Read the Excel 2003-2007
     * @param path the path of the Excel
     * @return
     * @throws IOException
     */
    public List<Student> readXls(String path) throws IOException {
        System.out.println(Common.PROCESSING + path);
        InputStream is = new FileInputStream(path);
        HSSFWorkbook hssfWorkbook = new HSSFWorkbook(is);
        Student student = null;
        List<Student> list = new ArrayList<Student>();
        // Read the Sheet
        for (int numSheet = 0; numSheet < hssfWorkbook.getNumberOfSheets(); numSheet++) {
            HSSFSheet hssfSheet = hssfWorkbook.getSheetAt(numSheet);
            if (hssfSheet == null) {
                continue;
            }
            // Read the Row
            for (int rowNum = 1; rowNum <= hssfSheet.getLastRowNum(); rowNum++) {
                HSSFRow hssfRow = hssfSheet.getRow(rowNum);
                if (hssfRow != null) {
                    student = new Student();
                    HSSFCell no = hssfRow.getCell(0);
                    HSSFCell name = hssfRow.getCell(1);
                    HSSFCell age = hssfRow.getCell(2);
                    HSSFCell score = hssfRow.getCell(3);
                    student.setNo(getValue(no));
                    student.setName(getValue(name));
                    student.setAge(getValue(age));
                    student.setScore(Float.valueOf(getValue(score)));
                    list.add(student);
                }
            }
        }
        return list;
    }

    @SuppressWarnings("static-access")
    private String getValue(XSSFCell xssfRow) {
        if (xssfRow.getCellType() == xssfRow.CELL_TYPE_BOOLEAN) {
            return String.valueOf(xssfRow.getBooleanCellValue());
        } else if (xssfRow.getCellType() == xssfRow.CELL_TYPE_NUMERIC) {
            return String.valueOf(xssfRow.getNumericCellValue());
        } else {
            return String.valueOf(xssfRow.getStringCellValue());
        }
    }

    @SuppressWarnings("static-access")
    private String getValue(HSSFCell hssfCell) {
        if (hssfCell.getCellType() == hssfCell.CELL_TYPE_BOOLEAN) {
            return String.valueOf(hssfCell.getBooleanCellValue());
        } else if (hssfCell.getCellType() == hssfCell.CELL_TYPE_NUMERIC) {
            return String.valueOf(hssfCell.getNumericCellValue());
        } else {
            return String.valueOf(hssfCell.getStringCellValue());
        }
    }
}

/Excel2010/src/com/b510/excel/client/Client.java

/**
 * 
 */
package com.b510.excel.client;

import java.io.IOException;
import java.util.List;

import com.b510.common.Common;
import com.b510.excel.ReadExcel;
import com.b510.excel.vo.Student;

/**
 * @author Hongten
 * @created 2014-5-21
 */
public class Client {

    public static void main(String[] args) throws IOException {
        String excel2003_2007 = Common.STUDENT_INFO_XLS_PATH;
        String excel2010 = Common.STUDENT_INFO_XLSX_PATH;
        // read the 2003-2007 excel
        List<Student> list = new ReadExcel().readExcel(excel2003_2007);
        if (list != null) {
            for (Student student : list) {
                System.out.println("No. : " + student.getNo() + ", name : " + student.getName() + ", age : " + student.getAge() + ", score : " + student.getScore());
            }
        }
        System.out.println("======================================");
        // read the 2010 excel
        List<Student> list1 = new ReadExcel().readExcel(excel2010);
        if (list1 != null) {
            for (Student student : list1) {
                System.out.println("No. : " + student.getNo() + ", name : " + student.getName() + ", age : " + student.getAge() + ", score : " + student.getScore());
            }
        }
    }
}

/Excel2010/src/com/b510/excel/util/Util.java

/**
 * 
 */
package com.b510.excel.util;

import com.b510.common.Common;

/**
 * @author Hongten
 * @created 2014-5-21
 */
public class Util {

    /**
     * get postfix of the path
     * @param path
     * @return
     */
    public static String getPostfix(String path) {
        if (path == null || Common.EMPTY.equals(path.trim())) {
            return Common.EMPTY;
        }
        if (path.contains(Common.POINT)) {
            return path.substring(path.lastIndexOf(Common.POINT) + 1, path.length());
        }
        return Common.EMPTY;
    }
}

/Excel2010/src/com/b510/excel/vo/Student.java

/**
 * 
 */
package com.b510.excel.vo;

/**
 * Student
 * 
 * @author Hongten
 * @created 2014-5-18
 */
public class Student {
    /**
     * id   
     */
    private Integer id;
    /**
     * 學號
     */
    private String no;
    /**
     * 姓名
     */
    private String name;
    /**
     * 學院
     */
    private String age;
    /**
     * 成績
     */
    private float score;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getNo() {
        return no;
    }

    public void setNo(String no) {
        this.no = no;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getAge() {
        return age;
    }

    public void setAge(String age) {
        this.age = age;
    }

    public float getScore() {
        return score;
    }

    public void setScore(float score) {
        this.score = score;
    }

}