jxl导入导出实例

package com.tgb.test;

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

import jxl.Cell;
import jxl.Sheet;
import jxl.Workbook;
import jxl.write.Label;
import jxl.write.Number;
import jxl.write.WritableImage;
import jxl.write.WritableSheet;
import jxl.write.WritableWorkbook;
import jxl.write.WriteException;

import org.apache.commons.lang3.math.NumberUtils;
import org.junit.Test;
//import org.junit.Test;
public class JxlDemo {
/**
* 导入(导入到内存)
*/
@Test
public void importExcel() {
Workbook book = null;
try {
book = Workbook.getWorkbook(new File("D:/test/test.xls"));
// 获得第一个工作表对象
Sheet sheet = book.getSheet(0);
int rows=sheet.getRows();
int columns=sheet.getColumns();
// 遍历每行每列的单元格
for(int i=0;i<rows;i++){
for(int j=0;j<columns;j++){
Cell cell = sheet.getCell(j, i);
String result = cell.getContents();
if(j==0){
System.out.print("姓名："+result+" ");
}
if(j==1){
System.out.print("年龄："+result+" ");
}
if((j+1)%2==0){
System.out.println();
}
}
}
System.out.println("========");
// 得到第一列第一行的单元格
Cell cell1 = sheet.getCell(0, 0);
String result = cell1.getContents();
System.out.println(result);
System.out.println("========");
} catch (Exception e) {
System.out.println(e);
}finally{
if(book!=null){
book.close();
}
}
}

/**
* 导出(导出到磁盘)
*/
@Test
public void exportExcel() {
WritableWorkbook book = null;
try {
// 打开文件
book = Workbook.createWorkbook(new File("D:/test/test.xls"));
// 生成名为"学生"的工作表，参数0表示这是第一页
WritableSheet sheet = book.createSheet("学生", 0);
// 指定单元格位置是第一列第一行(0, 0)以及单元格内容为张三
Label label = new Label(0, 0, "张三");
// 将定义好的单元格添加到工作表中
sheet.addCell(label);
// 保存数字的单元格必须使用Number的完整包路径
jxl.write.Number number = new jxl.write.Number(1, 0, 30);
sheet.addCell(number);
// 写入数据并关闭文件
book.write();
} catch (Exception e) {
System.out.println(e);
}finally{
if(book!=null){
try {
book.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
}

/**
* 对象数据写入到Excel
*/
@Test
public void writeExcel() {
WritableWorkbook book = null;
try {
// 打开文件
book = Workbook.createWorkbook(new File("D:/test/stu.xls"));
// 生成名为"学生"的工作表，参数0表示这是第一页
WritableSheet sheet = book.createSheet("学生", 0);

List<Student> stuList=queryStudentList();
if(stuList!=null && !stuList.isEmpty()){
for(int i=0; i<stuList.size(); i++){
sheet.addCell(new Label(0, i, stuList.get(i).getName()));
sheet.addCell(new Number(1, i, stuList.get(i).getAge()));
}
}

// 写入数据并关闭文件
book.write();
} catch (Exception e) {
System.out.println(e);
}finally{
if(book!=null){
try {
book.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}

}

/**
* 读取Excel数据到内存
*/
@Test
public void readExcel() {
Workbook book = null;
try {
// 打开文件
book = Workbook.getWorkbook(new File("D:/test/stu.xls"));
// 获得第一个工作表对象
Sheet sheet = book.getSheet(0);
int rows=sheet.getRows();
int columns=sheet.getColumns();
List<Student> stuList=new ArrayList<Student>();
// 遍历每行每列的单元格
for(int i=0;i<rows;i++){
Student stu = new Student();
for(int j=0;j<columns;j++){
Cell cell = sheet.getCell(j, i);
String result = cell.getContents();
if(j==0){
stu.setName(result);
}
if(j==1){
stu.setAge(NumberUtils.toInt(result));
}
if((j+1)%2==0){
stuList.add(stu);
stu=null;
}
}
}

//遍历数据
for(Student stu : stuList){
System.out.println(String.format("姓名：%s, 年龄：%s",
stu.getName(), stu.getAge()));
}

} catch (Exception e) {
System.out.println(e);
}finally{
if(book!=null){
try {
book.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}

}

/**
* 图片写入Excel，只支持png图片
*/
@Test
public void writeImg() {
WritableWorkbook wwb = null;
try {
wwb = Workbook.createWorkbook(new File("D:/test/image.xls"));
WritableSheet ws = wwb.createSheet("图片", 0);
File file = new File("D:\\test\\png.png");
//前两位是起始格，后两位是图片占多少个格，并非是位置
WritableImage image = new WritableImage(1, 4, 6, 18, file);
ws.addImage(image);
wwb.write();
} catch (Exception e) {
e.printStackTrace();
}finally{
if(wwb!=null){
try {
wwb.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
}

private List<Student> queryStudentList(){
List<Student> stuList=new ArrayList<Student>();
stuList.add(new Student("zhangsan", 20));
stuList.add(new Student("lisi", 25));
stuList.add(new Student("wangwu", 30));
return stuList;
}

public class Student {
private String name;
private int age;

public Student() {
}

public Student(String name, int age) {
super();
this.name = name;
this.age = age;
}

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;
}
}
}

　　以上的代码简单明了的示范了JXL的导入导出功能，具体的导入导出工具类都是在此基础上建立起来的。在最近的信用办的项目中出现了一个小问题，就是导出Excel的文件名如果是中文就会出现乱码，所以需要做一些简单的处理，如下：（实例借鉴：/article/4621327.html）

response.setHeader("Content-disposition", "attachment; filename="+ new String( fileName.getBytes("gb2312"), "ISO8859-1" )+ ".xls");

　　更加详细健壮的设置如下：

fileName = new String(fileName.getBytes(),"iso-8859-1");
response.setCharacterEncoding("gb2312");
response.reset();
response.setContentType("application/OCTET-STREAM;charset=gb2312");
response.setHeader("pragma", "no-cache");
response.addHeader("Content-Disposition", "attachment;filename=\""
+ fileName + ".xls\"");// 点击导出excle按钮时候页面显示的默认名称
workbook = Workbook.createWorkbook(response.getOutputStream());

　　了解这些基础知识，使用jxl导入导出Excel就轻而易举了。