你的上傳做了嗎？
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if (upfile.exists()) {
bytes = FileUtils.readFileToByteArray(upfile);
response.setContentType("application/x-download");
String agent = request.getHeader("USER-AGENT");//用戶代理
// 防止中文文件名亂碼
if (null != agent -1 != agent.indexOf("MSIE")) {
String codedfilename = StringUtils.replace(URLEncoder.encode(fileName, "UTF-8"), "+", "%20");
response.setHeader("Content-Disposition", "attachment;filename=" + codedfilename);
} else if (null != agent -1 != agent.indexOf("Mozilla")) {
String codedfilename = MimeUtility.encodeText(fileName, "UTF-8", "B");
response.setHeader("Content-Disposition", "attachment;filename=" + codedfilename);
} else {
response.setHeader("Content-Disposition", "attachment;filename=" + fileName);
}
response.setContentLength(bytes.length);
response.getOutputStream().write(bytes);
}
java編程方法下載服務(wù)器上的文件到本地客服端，代碼如下：
import?java.io.BufferedWriter;
import?java.io.File;
import?java.io.FileOutputStream;
import?java.io.FileWriter;
import?java.io.IOException;
import?java.io.InputStream;
import?java.net.URL;
import?java.net.URLConnection;
public?class?DownLoad?{???
public?static?void?downloadFile(URL?theURL,?String?filePath)?throws?IOException?{??
File?dirFile?=?new?File(filePath);
if(!dirFile.exists()){?
//文件路徑不存在時，自動創(chuàng)建目錄
dirFile.mkdir();
}
//從服務(wù)器上獲取圖片并保存
URLConnection?connection?=?theURL.openConnection();
InputStream?in?=?connection.getInputStream();??
FileOutputStream?os?=?new?FileOutputStream(filePath+"\\123.png");?
byte[]?buffer?=?new?byte[4?*?1024];??
int?read;??
while?((read?=?in.read(buffer))??0)?{??
os.write(buffer,?0,?read);??
}??
os.close();??
in.close();
}???
public?static?void?main(String[]?args)?{?
//下面添加服務(wù)器的IP地址和端口，以及要下載的文件路徑
String?urlPath?=?"http://服務(wù)器IP地址:端口/image/123.png";?
//下面代碼是下載到本地的位置
String?filePath?=?"d:\\excel";?
URL?url?=?new?URL(urlPath);?
try?{?
downloadFile(url,filePath);?
}?catch?(IOException?e)?{?
e.printStackTrace();?
}?
}???
}
參考下面
public HttpServletResponse download(String path, HttpServletResponse response) {
try {
// path是指欲下載的文件的路徑。
File file = new File(path);
// 取得文件名。
String filename = file.getName();
// 取得文件的后綴名。
String ext = filename.substring(filename.lastIndexOf(".") + 1).toUpperCase();
// 以流的形式下載文件。
InputStream fis = new BufferedInputStream(new FileInputStream(path));
byte[] buffer = new byte[fis.available()];
fis.read(buffer);
fis.close();
// 清空response
response.reset();
// 設(shè)置response的Header
response.addHeader("Content-Disposition", "attachment;filename=" + new String(filename.getBytes()));
response.addHeader("Content-Length", "" + file.length());
OutputStream toClient = new BufferedOutputStream(response.getOutputStream());
response.setContentType("application/octet-stream");
toClient.write(buffer);
toClient.flush();
toClient.close();
} catch (IOException ex) {
ex.printStackTrace();
}
return response;
}
// 下載本地文件
public void downloadLocal(HttpServletResponse response) throws FileNotFoundException {
String fileName = "Operator.doc".toString(); // 文件的默認(rèn)保存名
// 讀到流中
InputStream inStream = new FileInputStream("c:/Operator.doc");// 文件的存放路徑
// 設(shè)置輸出的格式
response.reset();
response.setContentType("bin");
response.addHeader("Content-Disposition", "attachment; filename=\"" + fileName + "\"");
// 循環(huán)取出流中的數(shù)據(jù)
byte[] b = new byte[100];
int len;
try {
while ((len = inStream.read(b)) 0)
response.getOutputStream().write(b, 0, len);
inStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
// 下載網(wǎng)絡(luò)文件
public void downloadNet(HttpServletResponse response) throws MalformedURLException {
int bytesum = 0;
int byteread = 0;
URL url = new URL("windine.blogdriver.com/logo.gif");
try {
URLConnection conn = url.openConnection();
InputStream inStream = conn.getInputStream();
FileOutputStream fs = new FileOutputStream("c:/abc.gif");
byte[] buffer = new byte[1204];
int length;
while ((byteread = inStream.read(buffer)) != -1) {
bytesum += byteread;
System.out.println(bytesum);
fs.write(buffer, 0, byteread);
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
//支持在線打開文件的一種方式
public void downLoad(String filePath, HttpServletResponse response, boolean isOnLine) throws Exception {
File f = new File(filePath);
if (!f.exists()) {
response.sendError(404, "File not found!");
return;
}
BufferedInputStream br = new BufferedInputStream(new FileInputStream(f));
byte[] buf = new byte[1024];
int len = 0;
response.reset(); // 非常重要
if (isOnLine) { // 在線打開方式
URL u = new URL("" + filePath);
response.setContentType(u.openConnection().getContentType());
response.setHeader("Content-Disposition", "inline; filename=" + f.getName());
// 文件名應(yīng)該編碼成UTF-8
} else { // 純下載方式
response.setContentType("application/x-msdownload");
response.setHeader("Content-Disposition", "attachment; filename=" + f.getName());
}
OutputStream out = response.getOutputStream();
while ((len = br.read(buf)) 0)
out.write(buf, 0, len);
br.close();
out.close();
}
這是我原來做的例子,里面有文件儲存的內(nèi)容,代碼不多,給你參考參考.
/**
* 五個按鈕的故事，西西哈。
*/
import java.awt.*;
import java.awt.event.*;
import java.io.*;
public class FileMessage extends Frame implements ActionListener
{
private static final long serialVersionUID = 10L;
Dialog dia;
private Panel p;
private File fi;
Process po=null;
private String s;
private TextArea ta;
private FileDialog fd;
private Button b1,b2,b3,b4,b5;
private Button b6;
public FileMessage()
{
super("文本文件處理");
setBackground( Color.LIGHT_GRAY );
setLocation(200,300);
setResizable( false);
setVisible( true);
addWindowListener( new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit( 0);
}
});
}
public void init()
{
ta=new TextArea("\n\n\n\n\n\t\t\t\t文本顯示區(qū)");
ta.setSize(30,5);
ta.setEditable(false);
add( ta,"North");
p=new Panel();
add( p,"Center");
b1=new Button("瀏覽");
b2=new Button("保存");
b3=new Button("清空");
b4=new Button("關(guān)閉");
b5=new Button("獨立打開");
b6=new Button("確定");
p.add(b1);
p.add(b2);
p.add(b3);
p.add(b4);
p.add(b5);
b1.addActionListener(this);
b2.addActionListener(this);
b3.addActionListener(this);
b4.addActionListener(this);
b5.addActionListener(this);
b6.addActionListener(this);
fd=new FileDialog(this,"請選擇文件",FileDialog.LOAD);
fd.setDirectory("f:\\note");
pack();
dia=new Dialog(this,"注意",true);
dia.setLayout(new BorderLayout());
Panel p1=new Panel();
p1.add( b6);
dia.add(new Label(" 請先選擇文件"),BorderLayout.CENTER);
dia.add( p1,BorderLayout.SOUTH);
dia.addWindowListener( new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
dia.setVisible( false);
}
});
dia.setLocation(310,370);
dia.setSize(200,130);
}
public static void main(String[] args)
{
new FileMessage().init();
}
public void actionPerformed(ActionEvent e)
{
if(e.getSource()==b1)
{
fd.setVisible(true);
s=fd.getDirectory()+fd.getFile();
fi=new File(s);
byte[] b=new byte[(int)fi.length()];
try
{
new FileInputStream(fi).read(b);
ta.setText(new String(b,0,(int)fi.length()));
}
catch(Exception e1){}
ta.setEditable(true);
}
else if(e.getSource()==b2)
{
try
{
if(ta.getText().equals("保存成功")||ta.getText() .equals( ""))
{}
else
{
new FileOutputStream(fi).write(ta.getText().getBytes());
ta.setText("保存成功");
ta.setEditable(false);
}
}
catch(FileNotFoundException e1)
{
ta.setText(e1.getMessage());
}
catch(IOException e1)
{
ta.setText("出現(xiàn)IOException異常");
}
}
else if(e.getSource()==b4)
System.exit(0);
else if(e.getSource()==b3)
{
ta.setText("");
ta.setEditable( false);
}
else if(e.getSource()==b5)
{
if(s==null)
{
dia.setVisible(true);
}
else
{
try
{
po=Runtime.getRuntime().exec("notepad.exe "+s);
}
catch(Exception ei)
{}
}
}
else if(e.getSource() ==b6)
{
dia.setVisible(false);
}
}
}
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