Java利用POI实现导入导出Excel表格示例代码

Java利用POI实现导入导出Excel表格示例代码

介绍

Jakarta POI 是一套用于访问微软格式文档的java API。Jakarta POI有很多组件组成，其中有用于操作Excel格式文件的HSSF和用于操作Word的HWPF，在各种组件中目前只有用于操作Excel的HSSF相对成熟。官方主页http://poi.apache.org/index.html，API文档http://poi.apache.org/apidocs/index.html

实现

已经在代码中加入了完整的注释。

import java.io.FileInputStream;

import java.io.FileOutputStream;

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.HSSFCellStyle;

import org.apache.poi.hssf.usermodel.HSSFRow;

import org.apache.poi.hssf.usermodel.HSSFSheet;

import org.apache.poi.hssf.usermodel.HSSFWorkbook;

public class ExcelOperate {

public static void main(String[] args) {

// 创建Excel表格

createExcel(getStudent());

// 读取Excel表格

List list = readExcel();

System.out.println(list.toString());

}

/**

* 初始化数据

*

* @return 数据

*/

private static List getStudent() {

List list = new ArrayList();

Student student1 = new Student("小明", 8, "二年级");

Student student2 = new Student("小光", 9, "三年级");

Student student3 = new Student("小花", 10, "四年级");

list.add(student1);

list.add(student2);

list.add(student3);

return list;

}

/**

* 创建Excel

*

* @param list

* 数据

*/

private static void createExcel(List list) {

// 创建一个Excel文件

HSSFWorkbook workbook = new HSSFWorkbook();

// 创建一个工作表

HSSFSheet sheet = workbook.createSheet("学生表一");

// 添加表头行

HSSFRow hssfRow = sheet.createRow(0);

// 设置单元格格式居中

HSSFCellStyle cellStyle = workbook.createCellStyle();

cellStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);

// 添加表头内容

HSSFCell headCell = hssfRow.createCell(0);

headCell.setCellValue("姓名");

headCell.setCellStyle(cellStyle);

headCell = hssfRow.createCell(1);

headCell.setCellValue("年龄");

headCell.setCellStyle(cellStyle);

headCell = hssfRow.createCell(2);

headCell.setCellValue("年级");

headCell.setCellStyle(cellStyle);

// 添加数据内容

for (int i = 0; i < list.size(); i++) {

hssfRow = sheet.createRow((int) i + 1);

Student student = list.get(i);

// 创建单元格，并设置值

HSSFCell cell = hssfRow.createCell(0);

cell.setCellValue(student.getName());

cell.setCellStyle(cellStyle);

cell = hssfRow.createCell(1);

http:// cell.setCellValue(student.getAge());

cell.setCellStyle(cellStyle);

cell = hssfRow.createCell(2);

cell.setCellValue(student.getGrade());

cell.setCellStyle(cellStyle);

}

// 保存Excel文件

try {

OutputStream outputStream = new FileOutputStream("D:/students.xls");

workbook.write(outputStream);

outputStream.close();

} catch (Exception e) {

e.printStackTrace();

}

}

/**

* 读取Excel

*

* @return 数据集合

*/

private static List readExcel() {

List list = new ArrayList();

HSSFWorkbook workbook = null;

try {

// 读取Excel文件

InputStream inputStream = new FileInputStream("D:/students.xls");

workbook = new HSSFWorkbook(inputStream);

inputStream.close();

} catch (Exception e) {

e.printStackTrace();

}

// 循环工作表

for (int numSheet = 0; numSheet < workbook.getNumberOfSheets(); numSheet++) {

HSSFSheet hssfSheet = workbook.getSheetAt(numSheet);

if (hssfSheet == null) {

continue;

}

// 循环行

for (int rowNum = 1; rowNum <= hssfSheet.getLastRowNum(); rowNum++) {

HSSFRow hssfRow = hssfSheet.getRow(rowNum);

if (hssfRow == null) {

continue;

}

// 将单元格中的内容存入集合

Student student = new Student();

HSSFCell cell = hssfRow.getCell(0);

if (cell == null) {

continue;

}

student.setName(cell.getStringCellValue());

cell = hssfRow.getCell(1);

if (cell == null) {

continue;

}

student.setAge((int) cell.getNumericCellValue());

cell = hssfRow.getCell(2);

if (cell == null) {

continue;

}

student.setGrade(cell.getStringCellValue());

list.add(student);

}

}

return list;

}

}

附上Student类的代码

public class Student {

private String name;

private int age;

private String grade;

public Student() {

}

public Student(String name, int age, String grade) {

super();

this.name = name;

this.age = age;

this.grade = grade;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public int getAge() {

return age;

}

public void setAge(int age) {

this.age = age;

}

public String getGrade() {

return grade;

}

public void setGrade(String grade) {

this.grade = grade;

}

@Override

public String toString() {

BtIXLc return "Student [name=" + name + ", age=" + age + ", grade=" + grade

+ "]";

}

}

测试结果

导出的Excel表格

打印读取的Excel数据

[Student [name=小明, age=8, grade=二年级], Student [name=小光, age=9, grade=三年级], Student [name=小花, age=10, grade=四年级]]

总结

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