文件上传Demo

InputStream
inp=ExcelUtil.class.getResourceAsStream("/com/java1234/template/"+templateFileName);
POIFSFileSystem fs=new POIFSFileSystem(inp);
Workbook wb=new HSSFWorkbook(fs);
Sheet sheet=wb.getSheetAt(0);
// 获取列数
int cellNums=sheet.getRow(0).getLastCellNum();
int rowIndex=1;
while(rs.next()){
Row row=sheet.createRow(rowIndex++);
for(int i=0;i<cellNums;i++){
row.createCell(i).setCellValue(rs.getObject(i+1).toString());
}
}
return wb;
}
public static void export(HttpServletResponse response,Workbook wb,String fileName)throws Exception{
response.setHeader("Content-Disposition", "attachment;filename="+new String(fileName.getBytes("utf-8"),"iso8859-1"));
response.setContentType("application/ynd.ms-excel;charset=UTF-8");
OutputStream out=response.getOutputStream();
wb.write(out);
out.flush();
out.close();
}
//文件上传的实例
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import javax.swing.*;
public class ExampleFrame_09 extends JFrame {
/**
*
*/
private static final long serialVersionUID = 1L;
private JTextField textField;
public static void main(String args[]) {
ExampleFrame_09 frame = new ExampleFrame_09();
frame.setVisible(true);
}
public ExampleFrame_09() {
super();
setTitle("文件选择对话框");
setBounds(100, 100, 500, 375);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
final JPanel panel = new JPanel();
getContentPane().add(panel, BorderLayout.NORTH);
final JLabel label = new JLabel();
label.setText("文件：");
panel.add(label);
textField = new JTextField();
textField.setColumns(20);
panel.add(textField);
final JButton button = new JButton();
button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
JFileChooser fileChooser = new JFileChooser();// 创建文件选择对话框
// 显示文件选择对话框
int i = fileChooser.showOpenDialog(getContentPane());
// 判断用户单击的是否为“打开”按钮
if (i == JFileChooser.APPROVE_OPTION) {
// 获得选中的文件对象
File selectedFile = fileChooser.getSelectedFile();
// 显示选中文件的名称
textField.setText(selectedFile.getName());
System.out.println(selectedFile.getName());
int len = 0;
byte []byt = new byte[1024];
try {
FileInputStream fileInputStream = new FileInputStream(selectedFile);
while((len = fileInputStream.read(byt)) != -1){
System.out.println(new String(byt));
}
} catch (FileNotFoundException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch(IOException e2){
e2.printStackTrace();
}
}
}
});
button.setText("上传");
panel.add(button);
//
}
}
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import javax.swing.*;
import javax.swing.filechooser.*;
import javax.swing.filechooser.FileFilter;
public class ExampleFrame_10 extends JFrame {
/**
*
*/
private static final long serialVersionUID = 1L;
public static void main(String args[]) {
ExampleFrame_10 frame = new ExampleFrame_10();
frame.setVisible(true);
}
public ExampleFrame_10() {
super();
setTitle("选择照片对话框");
setBounds(100, 100, 500, 375);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
final JLabel label = new JLabel("<双击选择照片>", SwingConstants.CENTER);
label.addMouseListener(new MouseAdapter() {
JFileChooser fileChooser;
{
// 创建文件选择对话框
fileChooser = new JFileChooser();
// 设置文件过滤器，只列出JPG或GIF格式的图片
FileFilter filter = new FileNameExtensionFilter(
"图像文件（JPG/GIF）", "JPG", "JPEG", "GIF");
fileChooser.setFileFilter(filter);
}
public void mouseClicked(MouseEvent e) {
if (e.getClickCount() == 2) {
// 显示文件选择对话框
int i = fileChooser.showOpenDialog(getContentPane());
// 判断用户单击的是否为“打开”按钮
if (i == JFileChooser.APPROVE_OPTION) {
// 获得选中的图片对象
File selectedFile = fileChooser.getSelectedFile();
label.setIcon(new ImageIcon(selectedFile
.getAbsolutePath()));// 将图片显示到标签上
label.setText(null);
}
}
}
});
getContentPane().add(label, BorderLayout.CENTER);
}
}。