第一步:ApachePoi的jar包导全,不全会出现异常。
第二步:写就完事了:此例为读取特定模板的excel,仅供参考,根据实际需求改写。
package 自建包;
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.WindowConstants;
import javax.swing.filechooser.FileFilter;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.WindowConstants;
import javax.swing.filechooser.FileFilter;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
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.apache.poi.ss.usermodel.Cell;
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;
public class FileChooserUtils2 implements ActionListener {
//初始面板
private JFrame f = null;
private JLabel label = null;
private JTextArea textarea = null;
private JFileChooser fileChooser = null;
private JLabel label = null;
private JTextArea textarea = null;
private JFileChooser fileChooser = null;
public FileChooserUtils2() {
f = new JFrame("FileChooser Example");
Container contentPane = f.getContentPane();
textarea = new JTextArea();
JScrollPane scrollPane = new JScrollPane(textarea);
scrollPane.setPreferredSize(new Dimension(350, 300));
f = new JFrame("FileChooser Example");
Container contentPane = f.getContentPane();
textarea = new JTextArea();
JScrollPane scrollPane = new JScrollPane(textarea);
scrollPane.setPreferredSize(new Dimension(350, 300));
JPanel panel = new JPanel();
JButton b1 = new JButton("新建文件");
b1.addActionListener(this);
JButton b2 = new JButton("存储文件");
b2.addActionListener(this);
panel.add(b1);
panel.add(b2);
JButton b1 = new JButton("新建文件");
b1.addActionListener(this);
JButton b2 = new JButton("存储文件");
b2.addActionListener(this);
panel.add(b1);
panel.add(b2);
label = new JLabel(" ", JLabel.CENTER);
fileChooser = new JFileChooser("C:\\Users\\xjung\\Desktop"); //默认是我的桌面,修改一下。
contentPane.add(label, BorderLayout.NORTH);
contentPane.add(scrollPane, BorderLayout.CENTER);
contentPane.add(panel, BorderLayout.SOUTH);
contentPane.add(scrollPane, BorderLayout.CENTER);
contentPane.add(panel, BorderLayout.SOUTH);
f.pack();
f.setVisible(true);
f.setDefaultCloseOperation(WindowConstants.HIDE_ON_CLOSE);//按x不会退出程序
}
f.setVisible(true);
f.setDefaultCloseOperation(WindowConstants.HIDE_ON_CLOSE);//按x不会退出程序
}
public static void main(String[] args) {
new FileChooserUtils2();
}
new FileChooserUtils2();
}
public void actionPerformed(ActionEvent e) {
File file = null;
int result;
File file = null;
int result;
if (e.getActionCommand().equals("新建文件")) {
fileChooser.setApproveButtonText("确定");
fileChooser.setDialogTitle("打开文件");
fileChooser.addChoosableFileFilter(new JAVAFileFilter("xls", "xlsx")); //加载过滤器
fileChooser.addChoosableFileFilter(new JAVAFileFilter("java"));
result = fileChooser.showOpenDialog(f);
textarea.setText("");
if (result == JFileChooser.APPROVE_OPTION) {
file = fileChooser.getSelectedFile();
label.setText("您选择打开的文件名称为:" + file.getName());
} else if (result == JFileChooser.CANCEL_OPTION) {
label.setText("您没有选择任何文件");
}
String extension="";
int index = file.toString().lastIndexOf('.');
if (index > 0 && index < file.toString().length() - 1) {
extension = file.toString().substring(index + 1).toLowerCase();
}
if("xls".equals(extension)||"xlsx".equals(extension)) {
readExcel(file.toString());
}else {
readNoExcel(file.toString());
}
fileChooser.setApproveButtonText("确定");
fileChooser.setDialogTitle("打开文件");
fileChooser.addChoosableFileFilter(new JAVAFileFilter("xls", "xlsx")); //加载过滤器
fileChooser.addChoosableFileFilter(new JAVAFileFilter("java"));
result = fileChooser.showOpenDialog(f);
textarea.setText("");
if (result == JFileChooser.APPROVE_OPTION) {
file = fileChooser.getSelectedFile();
label.setText("您选择打开的文件名称为:" + file.getName());
} else if (result == JFileChooser.CANCEL_OPTION) {
label.setText("您没有选择任何文件");
}
String extension="";
int index = file.toString().lastIndexOf('.');
if (index > 0 && index < file.toString().length() - 1) {
extension = file.toString().substring(index + 1).toLowerCase();
}
if("xls".equals(extension)||"xlsx".equals(extension)) {
readExcel(file.toString());
}else {
readNoExcel(file.toString());
}
}
if (e.getActionCommand().equals("存储文件")) {
result = fileChooser.showSaveDialog(f);
file = null;
if (e.getActionCommand().equals("存储文件")) {
result = fileChooser.showSaveDialog(f);
file = null;
if (result == JFileChooser.APPROVE_OPTION) {
file = fileChooser.getSelectedFile();
label.setText("您选择存储的文件名称为:" + file.getName());
} else if (result == JFileChooser.CANCEL_OPTION) {
label.setText("您没有选择任何文件");
}
file = fileChooser.getSelectedFile();
label.setText("您选择存储的文件名称为:" + file.getName());
} else if (result == JFileChooser.CANCEL_OPTION) {
label.setText("您没有选择任何文件");
}
FileOutputStream fileOutStream = null;
if (file != null) {
try {
fileOutStream = new FileOutputStream(file);
} catch (FileNotFoundException e2) {
label.setText("File Not Found");
return;
}
try {
fileOutStream = new FileOutputStream(file);
} catch (FileNotFoundException e2) {
label.setText("File Not Found");
return;
}
String content = textarea.getText();
try {
fileOutStream.write(content.getBytes());
} catch (IOException e2) {
label.setText("写入文件错误");
} finally {
try {
if (fileOutStream != null)
fileOutStream.close();
} catch (IOException e3) {
fileOutStream.write(content.getBytes());
} catch (IOException e2) {
label.setText("写入文件错误");
} finally {
try {
if (fileOutStream != null)
fileOutStream.close();
} catch (IOException e3) {
}
}
}
}
}
}
}
//读取非excel的文本方法
private void readNoExcel(String file) {
FileInputStream fileInStream = null;
InputStreamReader isr = null;
BufferedReader reader = null;
if (file != null) {
try {
fileInStream = new FileInputStream(file);
isr = new InputStreamReader(fileInStream, "UTF-8");
reader = new BufferedReader(isr);
} catch (FileNotFoundException e2) {
label.setText("File Not Found");
return;
} catch (UnsupportedEncodingException e3) {
label.setText("File Not Found");
return;
}
private void readNoExcel(String file) {
FileInputStream fileInStream = null;
InputStreamReader isr = null;
BufferedReader reader = null;
if (file != null) {
try {
fileInStream = new FileInputStream(file);
isr = new InputStreamReader(fileInStream, "UTF-8");
reader = new BufferedReader(isr);
} catch (FileNotFoundException e2) {
label.setText("File Not Found");
return;
} catch (UnsupportedEncodingException e3) {
label.setText("File Not Found");
return;
}
String readStr;
try {
while ((readStr = reader.readLine()) != null) {
textarea.append(readStr + "\n");
}
} catch (IOException e2) {
label.setText("写入文件错误");
} finally {
try {
if (fileInStream != null)
fileInStream.close();
} catch (IOException e3) {
while ((readStr = reader.readLine()) != null) {
textarea.append(readStr + "\n");
}
} catch (IOException e2) {
label.setText("写入文件错误");
} finally {
try {
if (fileInStream != null)
fileInStream.close();
} catch (IOException e3) {
}
}
}
}
}
}
//读取excel的内容
private void readExcel(String fileName) {
Workbook workbook = null;
Row row = null;
//获取Excel文档
workbook = getWorkbook(fileName);
//获取Excel文档的第一个sheet页
Sheet sheet = workbook.getSheetAt(0);
//获取文档中已保存数据的行数
int rowNum = sheet.getPhysicalNumberOfRows();
//获取第三行
row = sheet.getRow(2); //实现的是读取特定模板的excel,根据需求修改。
int colnum=5;
for (int i = 2; i < rowNum; i++) {
row = sheet.getRow(i);
if (null != row)
{
//获取当前行已保存数据的最大列数
colnum = row.getPhysicalNumberOfCells();
for (int j = 0; j < colnum; j++) {
Cell cell = row.getCell(j);
textarea.append(getValueFromCell(cell)+" ");
if(j==colnum-1) {
textarea.append("\n");
}
}
}
}
}
private void readExcel(String fileName) {
Workbook workbook = null;
Row row = null;
//获取Excel文档
workbook = getWorkbook(fileName);
//获取Excel文档的第一个sheet页
Sheet sheet = workbook.getSheetAt(0);
//获取文档中已保存数据的行数
int rowNum = sheet.getPhysicalNumberOfRows();
//获取第三行
row = sheet.getRow(2); //实现的是读取特定模板的excel,根据需求修改。
int colnum=5;
for (int i = 2; i < rowNum; i++) {
row = sheet.getRow(i);
if (null != row)
{
//获取当前行已保存数据的最大列数
colnum = row.getPhysicalNumberOfCells();
for (int j = 0; j < colnum; j++) {
Cell cell = row.getCell(j);
textarea.append(getValueFromCell(cell)+" ");
if(j==colnum-1) {
textarea.append("\n");
}
}
}
}
}
private static Workbook getWorkbook(String fileName) {//根据后缀获取Excel表格
Workbook workbook = null;
String suffix = fileName.substring(fileName.lastIndexOf(".") + 1);
InputStream in = null;
try {
in = new FileInputStream(fileName);
if ("xls".equals(suffix))
{
workbook = new HSSFWorkbook(in);
}
else if ("xlsx".equals(suffix))
{
workbook = new XSSFWorkbook(in);
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return workbook;
}
private static String getValueFromCell(Cell cell) {//获取单元格的值ֵ
String value = null;
if (null == cell)
{
return "";
}
//判断cell类型
switch(cell.getCellType()){
case NUMERIC:{
value = ""+(int)cell.getNumericCellValue();
break;
}
case STRING:{
value = cell.getStringCellValue();
break;
}
default:
value = "";
}
return value;
}
}
Workbook workbook = null;
String suffix = fileName.substring(fileName.lastIndexOf(".") + 1);
InputStream in = null;
try {
in = new FileInputStream(fileName);
if ("xls".equals(suffix))
{
workbook = new HSSFWorkbook(in);
}
else if ("xlsx".equals(suffix))
{
workbook = new XSSFWorkbook(in);
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return workbook;
}
private static String getValueFromCell(Cell cell) {//获取单元格的值ֵ
String value = null;
if (null == cell)
{
return "";
}
//判断cell类型
switch(cell.getCellType()){
case NUMERIC:{
value = ""+(int)cell.getNumericCellValue();
break;
}
case STRING:{
value = cell.getStringCellValue();
break;
}
default:
value = "";
}
return value;
}
}
//文件过滤器
class JAVAFileFilter extends FileFilter {
String ext;
String ext2;
String ext;
String ext2;
public JAVAFileFilter(String ext) {
this.ext = ext;
}
this.ext = ext;
}
public JAVAFileFilter(String ext, String ext2) {
this.ext = ext;
this.ext2 = ext2;
}
this.ext = ext;
this.ext2 = ext2;
}
//返回true过滤出文件
public boolean accept(File file) {
if (file.isDirectory())
return true;
if (file.isDirectory())
return true;
String fileName = file.getName();
int index = fileName.lastIndexOf('.');
if (index > 0 && index < fileName.length() - 1) {
String extension = fileName.substring(index + 1).toLowerCase();
if (extension.equals(ext) || extension.equals(ext2))
return true;
}
return false;
}
int index = fileName.lastIndexOf('.');
if (index > 0 && index < fileName.length() - 1) {
String extension = fileName.substring(index + 1).toLowerCase();
if (extension.equals(ext) || extension.equals(ext2))
return true;
}
return false;
}
//描述
public String getDescription() {
if (ext.equals("java"))
return "JAVA Source File (*.java)";
if (ext.equals("xls") && ext2.equals("xlsx"))
return "JAVA Source File (*.xls/.xlsx)";
return "";
}
}
if (ext.equals("java"))
return "JAVA Source File (*.java)";
if (ext.equals("xls") && ext2.equals("xlsx"))
return "JAVA Source File (*.xls/.xlsx)";
return "";
}
}