Java中使用Apache POI实现数据的Excel导入和导出

一、首先引入Apache POI jar包（目前较新版本）

1、poi-ooxml-3.15.jar(推荐使用)

下载地址: http://central.maven.org/maven2/org/apache/poi/poi-ooxml/3.15/poi-ooxml-3.15.jar

maven 仓库地址 ：http://www.mvnrepository.com/artifact/org.apache.poi/poi-ooxml

2、poi-3.15.jar

下载地址: http://central.maven.org/maven2/org/apache/poi/poi/3.15/poi-3.15.jar

maven 仓库地址: http://www.mvnrepository.com/artifact/org.apache.poi/poi/3.15

二、Excel数据样例


测试实体类

package com.fxrh.iccmcp.test;

public class Student {

private Integer id;
private String no;
private String name;
private Integer age;
private Double score;

public Student(){}

public Student(String no, String name, Integer age, Double score) {
this.no = no;
this.name = name;
this.age = age;
this.score = 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 Integer getAge() {
return age;
}

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

public Double getScore() {
return score;
}

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

@Override
public String toString() {
return "Student [id=" + id + ", no=" + no + ", name=" + name + ", age=" + age + ", score=" + score + "]";
}

}

三、测试程序

package com.fxrh.iccmcp.test;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

import java.text.DecimalFormat;

import java.util.ArrayList;

import java.util.Date;

import java.util.List;

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

import org.apache.poi.ss.usermodel.Cell;

import org.apache.poi.ss.usermodel.CellStyle;

import org.apache.poi.ss.usermodel.Row;

import org.apache.poi.ss.usermodel.Sheet;

import org.apache.poi.ss.usermodel.Workbook;

import org.apache.poi.xssf.usermodel.XSSFWorkbook;

import org.hibernate.SessionFactory;

import org.junit.Test;

//import org.junit.runner.RunWith;

//import org.springframework.beans.factory.annotation.Autowired;

//import org.springframework.test.context.ContextConfiguration;

//import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import org.springframework.util.StringUtils;

//@RunWith(SpringJUnit4ClassRunner.class)

//@ContextConfiguration(“classpath:applicationContext.xml”)

public class ExcelPOITest {

//@Autowired private SessionFactory sessionFactory;

@Test
public void test(){

System.out.println(new Date().toLocaleString());

ExcelPOITest ept = new ExcelPOITest();
List<Student> list = ept.readExcelData("C:\\Users\\dell\\Desktop\\sample.xlsx");
System.out.println(list.size());
for (Student stu : list) {
System.out.println(stu);
}

String[] titleRow = {"No","姓名","Age","分数"};
ept.writeExcelData("C:\\Users\\dell\\Desktop\\aa.xls", list, titleRow);

}

public List<Student> readExcelData(String fileName){
List<Student> list = new ArrayList<Student>();
Student student = null;
FileInputStream fis = null;
try {
//Create the input stream from the xlsx/xls file
fis = new FileInputStream(fileName);
//Create Workbook instance for xlsx/xls file input stream
Workbook workbook = null;
if(fileName.toLowerCase().endsWith(".xlsx")){
workbook = new XSSFWorkbook(fis);
}else if(fileName.toLowerCase().endsWith(".xls")){
workbook = new HSSFWorkbook(fis);
}
Sheet sheet = null;
Row row = null;
Integer succ = 0;
Integer errNum = 0;
Integer count = 0;
String errorInfo="";
if(workbook!=null){
for (int i = 0; i < workbook.getNumberOfSheets(); i++) {//循环表
sheet = workbook.getSheetAt(i);// 第i张表格
for(int j=1;j < sheet.getPhysicalNumberOfRows();j++){//循环行
//row.getPhysicalNumberOfCells();  //列数
if(errNum>=20){break;}
row = sheet.getRow(j);
if(row == null){break;};//判断行是否还有数据
if(StringUtils.isEmpty(getCellVaule(row.getCell(0)))){break;};
++count;
student  = new Student();
int index = 0;//表  列索引
student.setNo(getCellVaule(row.getCell(index)));
student.setName(getCellVaule(row.getCell(++index)));
student.setAge(Integer.valueOf(getCellVaule(row.getCell(++index))));
student.setScore(Double.valueOf(getCellVaule(row.getCell(++index))));
list.add(student);
}
}
}
}catch (Exception e){
e.printStackTrace();
} finally {
if(fis!=null){
try {
fis.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return list;
}

public String getCellVaule(Cell cell){
String value = null;
if(cell == null) return value;
switch (cell.getCellType()) {
8a50
case Cell.CELL_TYPE_STRING:
value = cell.getRichStringCellValue().toString();
break;
case Cell.CELL_TYPE_NUMERIC:
value = new DecimalFormat("0.######").format(cell.getNumericCellValue());
break;
case Cell.CELL_TYPE_BOOLEAN:
value = String.valueOf(cell.getBooleanCellValue());
break;
case Cell.CELL_TYPE_FORMULA:
value = cell.getArrayFormulaRange().formatAsString();
break;
case Cell.CELL_TYPE_BLANK:
value = "";
break;
default:
value = cell.getRichStringCellValue().toString();
break;
}
if(value == null) return null;
return value;
}

public void writeExcelData(String excelPath,List<Student> list,String titleRow[]){
Workbook workbook = null;
Sheet sheet = null;
FileOutputStream out = null;
try {
File file = new File(excelPath);
if(!file.exists()){
file.createNewFile();
}
if(excelPath.toLowerCase().endsWith(".xls")){
workbook = new HSSFWorkbook();
}else if(excelPath.toLowerCase().endsWith(".xlsx")){
workbook = new XSSFWorkbook();
}
sheet = workbook.createSheet("Sheet1");//创建第一张表
//sheet.setDefaultColumnWidth((short)15);
int rowNumber = sheet.getLastRowNum();  // 第一行从0开始算
//System.out.println("原始数据总行数，除属性列：" + rowNumber);
for (int i = 1; i <= rowNumber; i++) {//删除原有Excel文件
Row row = sheet.getRow(i);
sheet.removeRow(row);
}
Row row = sheet.createRow(0);//创建第一行    列属性(表头)
for(int i=0;i<titleRow.length;i++){//写  第一行
row.createCell(i).setCellValue(titleRow[i]);
}
for (int i=0;i<list.size();i++) {//写数据
int lastRowNum = sheet.getLastRowNum();
Row currentRow = sheet.createRow(lastRowNum + 1);
int index = 0;//写  第i列
while(index<titleRow.length){
currentRow.createCell(index++).setCellValue(list.get(i).getNo());
currentRow.createCell(index++).setCellValue(list.get(i).getName());
currentRow.createCell(index++).setCellValue(list.get(i).getAge().toString());
currentRow.createCell(index++).setCellValue(list.get(i).getScore().toString());
}
}
out = new FileOutputStream(file);
workbook.write(out);
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if(out != null){
out.flush();
out.close();
}
} catch (Exception e) {
e.printStackTrace();
}
}
System.out.println("数据导出成功");
}

}