java的poi技术读，写Excel[2003-2007,2010]

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本文主要讲的是java中poi读和写excel（版本是2003-2007,2010）

项目结构：

所用到的excel

运行效果：

Processing...lib/student_info.xls
No. : 201401, name : Hongten, age : 22.0, score : 98.0
No. : 201402, name : Hanyuan, age : 21.0, score : 96.0
No. : 201403, name : Tom, age : 20.0, score : 94.0
No. : 201404, name : HanKet, age : 21.0, score : 90.0
No. : 201405, name : Jone, age : 22.0, score : 42.0
No. : 201406, name : Kite, age : 23.0, score : 59.0
No. : 201407, name : Lucy, age : 25.0, score : 60.0
No. : 201408, name : Mark, age : 23.0, score : 89.0
No. : 201409, name : Jeson, age : 24.0, score : 79.0
No. : 201410, name : Steven, age : 23.0, score : 59.0
No. : 201411, name : Tide, age : 22.0, score : 88.0
No. : 201412, name : Deli, age : 22.0, score : 89.0
No. : 201413, name : Goerme, age : 21.0, score : 98.0
No. : 201414, name : Som, age : 23.0, score : 95.0
======================================
Processing...lib/student_info.xlsx
No. : 201401, name : Hongten, age : 22.0, score : 98.0
No. : 201402, name : Hanyuan, age : 21.0, score : 96.0
No. : 201403, name : Tom, age : 20.0, score : 94.0
No. : 201404, name : HanKet, age : 21.0, score : 90.0
No. : 201405, name : Jone, age : 22.0, score : 42.0
No. : 201406, name : Kite, age : 23.0, score : 59.0
No. : 201407, name : Lucy, age : 25.0, score : 60.0
No. : 201408, name : Mark, age : 23.0, score : 89.0
No. : 201409, name : Jeson, age : 24.0, score : 79.0
No. : 201410, name : Steven, age : 23.0, score : 59.0
No. : 201411, name : Tide, age : 22.0, score : 88.0
No. : 201412, name : Deli, age : 22.0, score : 89.0
No. : 201413, name : Goerme, age : 21.0, score : 98.0
No. : 201414, name : Som, age : 23.0, score : 95.0
======================================
write data to file : lib/student_info_2003-2007.xls
write data to file : lib/student_info_2010.xlsx
======================================
Processing...lib/student_info_2003-2007.xls
No. : 201401, name : Hongten, age : 22.0, score : 98.0
No. : 201402, name : Hanyuan, age : 21.0, score : 96.0
No. : 201403, name : Tom, age : 20.0, score : 94.0
No. : 201404, name : HanKet, age : 21.0, score : 90.0
No. : 201405, name : Jone, age : 22.0, score : 42.0
No. : 201406, name : Kite, age : 23.0, score : 59.0
No. : 201407, name : Lucy, age : 25.0, score : 60.0
No. : 201408, name : Mark, age : 23.0, score : 89.0
No. : 201409, name : Jeson, age : 24.0, score : 79.0
No. : 201410, name : Steven, age : 23.0, score : 59.0
No. : 201411, name : Tide, age : 22.0, score : 88.0
No. : 201412, name : Deli, age : 22.0, score : 89.0
No. : 201413, name : Goerme, age : 21.0, score : 98.0
No. : 201414, name : Som, age : 23.0, score : 95.0
======================================
Processing...lib/student_info_2010.xlsx
No. : 201401, name : Hongten, age : 22.0, score : 98.0
No. : 201402, name : Hanyuan, age : 21.0, score : 96.0
No. : 201403, name : Tom, age : 20.0, score : 94.0
No. : 201404, name : HanKet, age : 21.0, score : 90.0
No. : 201405, name : Jone, age : 22.0, score : 42.0
No. : 201406, name : Kite, age : 23.0, score : 59.0
No. : 201407, name : Lucy, age : 25.0, score : 60.0
No. : 201408, name : Mark, age : 23.0, score : 89.0
No. : 201409, name : Jeson, age : 24.0, score : 79.0
No. : 201410, name : Steven, age : 23.0, score : 59.0
No. : 201411, name : Tide, age : 22.0, score : 88.0
No. : 201412, name : Deli, age : 22.0, score : 89.0
No. : 201413, name : Goerme, age : 21.0, score : 98.0
No. : 201414, name : Som, age : 23.0, score : 95.0

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

源码部分：

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

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

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

 import java.util.List;

 import com.b510.excel.common.Common;
 import com.b510.excel.util.ExcelUtil;
 import com.b510.excel.vo.Student;

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

     public static void main(String[] args) throws Exception {
         String read_excel2003_2007_path = Common.STUDENT_INFO_XLS_PATH;
         String read_excel2010_path = Common.STUDENT_INFO_XLSX_PATH;
         // read the 2003-2007 excel
         List<Student> list = new ExcelUtil().readExcel(read_excel2003_2007_path);
         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 ExcelUtil().readExcel(read_excel2010_path);
         if (list1 != null) {
             for (Student student : list1) {
                 System.out.println("No. : " + student.getNo() + ", name : " + student.getName() + ", age : " + student.getAge() + ", score : " + student.getScore());
             }
         }
         System.out.println("======================================");
         String write_excel2003_2007_path = Common.STUDENT_INFO_XLS_OUT_PATH;
         String write_excel2010_path = Common.STUDENT_INFO_XLSX_OUT_PATH;
         new ExcelUtil().writeExcel(list, write_excel2003_2007_path);
         new ExcelUtil().writeExcel(list, write_excel2010_path);
         System.out.println("======================================");

         // read the 2003-2007 excel
         List<Student> list2 = new ExcelUtil().readExcel(write_excel2003_2007_path);
         if (list != null) {
             for (Student student : list2) {
                 System.out.println("No. : " + student.getNo() + ", name : " + student.getName() + ", age : " + student.getAge() + ", score : " + student.getScore());
             }
         }
         System.out.println("======================================");
         // read the 2010 excel
         List<Student> list3 = new ExcelUtil().readExcel(write_excel2010_path);
         if (list1 != null) {
             for (Student student : list3) {
                 System.out.println("No. : " + student.getNo() + ", name : " + student.getName() + ", age : " + student.getAge() + ", score : " + student.getScore());
             }
         }
     }
 }

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

 /**
  *
  */
 package com.b510.excel.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 STUDENT_INFO_XLS_OUT_PATH = "lib/student_info_2003-2007.xls";
     public static final String STUDENT_INFO_XLSX_OUT_PATH = "lib/student_info_2010.xlsx";
     public static final String NOT_EXCEL_FILE = " : Not the Excel file!";
     public static final String PROCESSING = "Processing...";
     public static final String WRITE_DATA = "write data to file : ";

 }

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

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

 import java.io.File;
 import java.io.FileInputStream;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
 import java.util.ArrayList;
 import java.util.List;

 import org.apache.poi.hssf.usermodel.HSSFCell;
 import org.apache.poi.hssf.usermodel.HSSFRichTextString;
 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.XSSFRichTextString;
 import org.apache.poi.xssf.usermodel.XSSFRow;
 import org.apache.poi.xssf.usermodel.XSSFSheet;
 import org.apache.poi.xssf.usermodel.XSSFWorkbook;

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

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

     public void writeExcel(List<Student> list, String path) throws Exception {
         if (list == null) {
             return;
         } else if (path == null || Common.EMPTY.equals(path)) {
             return;
         } else {
             String postfix = Util.getPostfix(path);
             if (!Common.EMPTY.equals(postfix)) {
                 if (Common.OFFICE_EXCEL_2003_POSTFIX.equals(postfix)) {
                     writeXls(list, path);
                 } else if (Common.OFFICE_EXCEL_2010_POSTFIX.equals(postfix)) {
                     writeXlsx(list, path);
                 }
             }else{
                 System.out.println(path + Common.NOT_EXCEL_FILE);
             }
         }
     }

     /**
      * 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());
         }
     }

     public void writeXls(List<Student> list, String path) throws Exception {
         if (list == null) {
             return;
         }
         int countColumnNum = list.size();
         HSSFWorkbook book = new HSSFWorkbook();
         HSSFSheet sheet = book.createSheet("studentSheet");
         // option at first row.
         HSSFRow firstRow = sheet.createRow(0);
         HSSFCell[] firstCells = new HSSFCell[countColumnNum];
         String[] options = { "no", "name", "age", "score" };
         for (int j = 0; j < options.length; j++) {
             firstCells[j] = firstRow.createCell(j);
             firstCells[j].setCellValue(new HSSFRichTextString(options[j]));
         }
         //
         for (int i = 0; i < countColumnNum; i++) {
             HSSFRow row = sheet.createRow(i + 1);
             Student student = list.get(i);
             for (int column = 0; column < options.length; column++) {
                 HSSFCell no = row.createCell(0);
                 HSSFCell name = row.createCell(1);
                 HSSFCell age = row.createCell(2);
                 HSSFCell score = row.createCell(3);
                 no.setCellValue(student.getNo());
                 name.setCellValue(student.getName());
                 age.setCellValue(student.getAge());
                 score.setCellValue(student.getScore());
             }
         }
         File file = new File(path);
         OutputStream os = new FileOutputStream(file);
         System.out.println(Common.WRITE_DATA + path);
         book.write(os);
         os.close();
     }

     public void writeXlsx(List<Student> list, String path) throws Exception {
         if (list == null) {
             return;
         }
         //XSSFWorkbook
         int countColumnNum = list.size();
         XSSFWorkbook book = new XSSFWorkbook();
         XSSFSheet sheet = book.createSheet("studentSheet");
         // option at first row.
         XSSFRow firstRow = sheet.createRow(0);
         XSSFCell[] firstCells = new XSSFCell[countColumnNum];
         String[] options = { "no", "name", "age", "score" };
         for (int j = 0; j < options.length; j++) {
             firstCells[j] = firstRow.createCell(j);
             firstCells[j].setCellValue(new XSSFRichTextString(options[j]));
         }
         //
         for (int i = 0; i < countColumnNum; i++) {
             XSSFRow row = sheet.createRow(i + 1);
             Student student = list.get(i);
             for (int column = 0; column < options.length; column++) {
                 XSSFCell no = row.createCell(0);
                 XSSFCell name = row.createCell(1);
                 XSSFCell age = row.createCell(2);
                 XSSFCell score = row.createCell(3);
                 no.setCellValue(student.getNo());
                 name.setCellValue(student.getName());
                 age.setCellValue(student.getAge());
                 score.setCellValue(student.getScore());
             }
         }
         File file = new File(path);
         OutputStream os = new FileOutputStream(file);
         System.out.println(Common.WRITE_DATA + path);
         book.write(os);
         os.close();
     }
 }

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

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

 import com.b510.excel.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;
     /**
      * 学号
      */
     private String no;
     /**
      * 姓名
      */
     private String name;
     /**
      * 学院
      */
     private String age;
     /**
      * 成绩
      */
     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;
     }

 }

源码下载：http://pan.baidu.com/s/1eQpEf0u

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