1、web.xml文件中增加
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mime-mapping
extensiondoc/extension
mime-typeapplication/vnd.ms-word/mime-type
/mime-mapping
2、程序如下：
%@page language="java" contentType="application/x-msdownload" import="java.io.*,java.net.*" pageEncoding="gb2312"%
%
//关于文件下载时采用文件流输出的方式处理：
//加上response.reset()，并且所有的％后面不要换行，包括最后一个；
//因为Application Server在处理编译jsp时对于％和％之间的内容一般是原样输出，而且默认是PrintWriter，
//而你却要进行流输出：ServletOutputStream，这样做相当于试图在Servlet中使用两种输出机制，
//就会发生：getOutputStream() has already been called for this response的错误
//详细请见《More Java Pitfill》一书的第二部分 Web层Item 33：试图在Servlet中使用两种输出机制 270
//而且如果有换行，对于文本文件没有什么问题，但是对于其它格式，比如AutoCAD、Word、Excel等文件
//下载下来的文件中就会多出一些换行符0x0d和0x0a，这样可能导致某些格式的文件无法打开，有些也可以正常打开。
response.reset();//可以加也可以不加
response.setContentType("application/x-download");//设置为下载application/x-download
// /../../退WEB-INF/classes两级到应用的根目录下去，注意Tomcat与WebLogic下面这一句得到的路径不同，WebLogic中路径最后没有/
System.out.println(this.getClass().getClassLoader().getResource("/").getPath());
String filenamedownload = this.getClass().getClassLoader().getResource("/").getPath() + "/../../系统解决方案.doc";
String filenamedisplay = "系统解决方案.doc";//系统解决方案.txt
filenamedisplay = URLEncoder.encode(filenamedisplay,"UTF-8");
response.addHeader("Content-Disposition","attachment;filename=" + filenamedisplay);
OutputStream output = null;
FileInputStream fis = null;
try
{
output = response.getOutputStream();
fis = new FileInputStream(filenamedownload);
byte[] b = new byte[1024];
int i = 0;
while((i = fis.read(b)) 0)
{
output.write(b, 0, i);
}
output.flush();
}
catch(Exception e)
{
System.out.println("Error!");
e.printStackTrace();
}
finally
{
if(fis != null)
{
fis.close();
}
报错的具体信息是什么
中文的变量名，难于检查，不同的平台又容易出错。
作业其实还是自己写的好。要用到JMF包啊，到网上下载一个JMF包，照着说明安装上。
以下是我写的一个很简单的播放器，只能播放mp3，mpeg，mpg，wav等简单的格式。
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.media.ControllerEvent;
import javax.media.ControllerListener;
import javax.media.MediaLocator;
import javax.media.RealizeCompleteEvent;
import javax.media.bean.playerbean.MediaPlayer;
import javax.swing.JPanel;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
import javax.swing.JList;
import java.awt.BorderLayout;
import javax.swing.JSplitPane;
import java.awt.Component;
import java.util.Vector;
public class JMF_T extends JFrame implements ControllerListener, ActionListener {
MediaPlayer Player;
private String filename = "";
private static final long serialVersionUID = 1L;
private Vector vct = new Vector(); // @jve:decl-index=0:
private JPanel jContentPane = null;
private JSplitPane jSplitPane = null;
private JPanel playPanel = null;
private JList jList = null;
private JSplitPane getJSplitPane() {
if (jSplitPane == null) {
jSplitPane = new JSplitPane();
jSplitPane.setDividerSize(5);
jSplitPane.setResizeWeight(0.8);
jSplitPane.setRightComponent(getJList());
jSplitPane.setLeftComponent(getPlayPanel());
}
return jSplitPane;
}
private JPanel getPlayPanel() {
if (playPanel == null) {
playPanel = new JPanel();
playPanel.setLayout(new BorderLayout());
}
return playPanel;
}
private JList getJList() {
if (jList == null) {
jList = new JList();
jList.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent e) {
// TODO Auto-generated Event stub mouseClicked()
if (e.getClickCount() == 1) {
String str = (String) jList.getSelectedValue();
if (str == null) {
return;
}
filename = str;
System.out.println(str);
}
if (e.getClickCount() == 2) {
String str = (String) jList.getSelectedValue();
if (str == null) {
return;
}
filename = str;
play();
}
}
});
}
return jList;
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
JMF_T thisClass = new JMF_T();
thisClass.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
thisClass.setVisible(true);
}
});
}
public JMF_T() {
initialize();
}
private void OpenFile() {
FileDialog fd = new FileDialog(this, "Choose Video", FileDialog.LOAD);
fd.setVisible(true);
filename = fd.getDirectory() + fd.getFile();
System.out.println(filename);
if (filename.equals("")) {
return;
} else if (filename.equals("nullnull")) {
return;
}
boolean j = false;
for (int i = 0; i vct.size(); i++) {
if (vct.get(i).toString().equals(filename)) {
j = true;
break;
}
}
if (j == false) {
vct.add(filename);
jList.setListData(vct);
}
}
private void stop() {
if (Player != null) {
Player.stop();
Player.deallocate();
}
}
private void play() {
try {
if (filename.equals("")) {
return;
}
if (Player == null) {
Player = new MediaPlayer();
} else {
closePreviosPlayer();
}
Player.setMediaLocator(new MediaLocator("" + filename));
Player.addControllerListener(this);
Player.realize();
Player.start();
} catch (Exception e) {
}
}
public void actionPerformed(ActionEvent e) {
String action = e.getActionCommand().toString();
if (action.equals("Open")) {
OpenFile();
}
if (action.equals("Play")) {
play();
}
if (action.equals("Stop")) {
stop();
}
if (action.equals("Exit")) {
dispose();
System.exit(0);
}
}
private void initialize() {
this.setSize(500, 350);
setLocation(300, 100);
this.setContentPane(getJContentPane());
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
dispose();
System.exit(0);
}
});
MenuBar mb = new MenuBar();
setMenuBar(mb);
Menu fileMenu = new Menu("File");
Menu actMenu = new Menu("Action");
mb.add(fileMenu);
mb.add(actMenu);
MenuItem itemOpen = new MenuItem("Open");
itemOpen.addActionListener(this);
fileMenu.add(itemOpen);
fileMenu.addSeparator();
MenuItem itemPlay = new MenuItem("Play");
itemPlay.addActionListener(this);
actMenu.add(itemPlay);
actMenu.addSeparator();
MenuItem itemStop = new MenuItem("Stop");
itemStop.addActionListener(this);
actMenu.add(itemStop);
MenuItem itemExit = new MenuItem("Exit");
itemExit.addActionListener(this);
fileMenu.add(itemExit);
this.validate();
this.setVisible(true);
}
private JPanel getJContentPane() {
if (jContentPane == null) {
jContentPane = new JPanel();
jContentPane.setLayout(new BorderLayout());
jContentPane.add(getJSplitPane(), BorderLayout.CENTER);
}
return jContentPane;
}
private void closePreviosPlayer() {
if (Player == null)
return;
Player.stop();
Player.deallocate(); // 停止播放并且重新装载DateSource
Component visual = Player.getVisualComponent();
Component control = Player.getControlPanelComponent();
if (visual != null) {
playPanel.remove(visual);
}
if (control != null) {
playPanel.remove(control);
}
}
public synchronized void controllerUpdate(ControllerEvent event) {
if (event instanceof RealizeCompleteEvent) {
Component comp;
if ((comp = Player.getControlPanelComponent()) != null) {
playPanel.add("South", comp);
} else {
closePreviosPlayer();
}
if ((comp = Player.getVisualComponent()) != null) {
playPanel.add("Center", comp);
}
validate();
}
}
}
--------------不支持MP3---------------------
public AudioClip loadSound(String filename) { // 返回一个AudioClip对象
URL url = null; // 因为newAudioClip()的参数为URL型
try {
url = new URL("file:" + filename); // 指定文件，“file:"不能少
} catch (MalformedURLException e) {
}
return JApplet.newAudioClip(url); // 通过newAudioClip(
// )方法装载声音，此方法为JDK后添加的方法，太老的JDK里可能没有
}
AudioClip s1 = loadSound("声音//TableStopGetPrice.wav");
s1.play();
------------------支持mp3--------------------------
见附件
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;
import javazoom.jl.decoder.Bitstream;
import javazoom.jl.decoder.BitstreamException;
import javazoom.jl.decoder.Decoder;
import javazoom.jl.decoder.Header;
import javazoom.jl.decoder.JavaLayerException;
import javazoom.jl.decoder.SampleBuffer;
import javazoom.jl.player.AudioDevice;
import javazoom.jl.player.FactoryRegistry;
/**
* The codePlayer/code class implements a simple player for playback of an
* MPEG audio stream.
*
* @author Mat McGowan
* @since 0.0.8
*/
public class Player
{
/**
* The current frame number.
*/
private int frame = 0;
/**
* The MPEG audio bitstream.
*/
// javac blank final bug.
/* final */private Bitstream bitstream;
/**
* The MPEG audio decoder.
*/
/* final */private Decoder decoder;
/**
* The AudioDevice the audio samples are written to.
*/
private AudioDevice audio;
/**
* Has the player been closed?
*/
private boolean closed = false;
/**
* Has the player played back all frames from the stream?
*/
private boolean complete = false;
private int lastPosition = 0;
/**
* Creates a new codePlayer/code instance.
*/
public Player ( InputStream stream ) throws JavaLayerException
{
this (stream, null);
}
public Player ( InputStream stream, AudioDevice device ) throws JavaLayerException
{
bitstream = new Bitstream (stream);
decoder = new Decoder ();
if (device != null)
{
audio = device;
}
else
{
FactoryRegistry r = FactoryRegistry.systemRegistry ();
audio = r.createAudioDevice ();
}
audio.open (decoder);
}
public void play () throws JavaLayerException
{
play (Integer.MAX_VALUE);
}
/**
* Plays a number of MPEG audio frames.
*
* @param frames
* The number of frames to play.
* @return true if the last frame was played, or false if there are more
* frames.
*/
public boolean play ( int frames ) throws JavaLayerException
{
boolean ret = true;
while (frames-- 0 ret)
{
ret = decodeFrame ();
}
if (!ret)
{
// last frame, ensure all data flushed to the audio device.
AudioDevice out = audio;
if (out != null)
{
out.flush ();
synchronized (this)
{
complete = ( !closed );
close ();
}
}
}
return ret;
}
/**
* Cloases this player. Any audio currently playing is stopped immediately.
*/
public synchronized void close ()
{
AudioDevice out = audio;
if (out != null)
{
closed = true;
audio = null;
// this may fail, so ensure object state is set up before
// calling this method.
out.close ();
lastPosition = out.getPosition ();
try
{
bitstream.close ();
}
catch (BitstreamException ex)
{}
}
}
/**
* Returns the completed status of this player.
*
* @return true if all available MPEG audio frames have been decoded, or
* false otherwise.
*/
public synchronized boolean isComplete ()
{
return complete;
}
/**
* Retrieves the position in milliseconds of the current audio sample being
* played. This method delegates to the code
* AudioDevice/code that is used by this player to sound the decoded audio
* samples.
*/
public int getPosition ()
{
int position = lastPosition;
AudioDevice out = audio;
if (out != null)
{
position = out.getPosition ();
}
return position;
}
/**
* Decodes a single frame.
*
* @return true if there are no more frames to decode, false otherwise.
*/
protected boolean decodeFrame () throws JavaLayerException
{
try
{
AudioDevice out = audio;
if (out == null)
return false;
Header h = bitstream.readFrame ();
if (h == null)
return false;
// sample buffer set when decoder constructed
SampleBuffer output = (SampleBuffer) decoder.decodeFrame (h, bitstream);
synchronized (this)
{
out = audio;
if (out != null)
{
out.write (output.getBuffer (), 0, output.getBufferLength ());
}
}
bitstream.closeFrame ();
}
catch (RuntimeException ex)
{
throw new JavaLayerException ("Exception decoding audio frame", ex);
}
/*
* catch (IOException ex) {
* System.out.println("exception decoding audio frame: "+ex); return
* false; } catch (BitstreamException bitex) {
* System.out.println("exception decoding audio frame: "+bitex); return
* false; } catch (DecoderException decex) {
* System.out.println("exception decoding audio frame: "+decex); return
* false; }
*/
return true;
}
public static void main ( String[] args )
{
try
{
Player player = new Player (new FileInputStream (new File ("D:\\Youdagames\\JLayer1.0.1\\abc.mp3")));
player.play ();
}
catch (FileNotFoundException e)
{
e.printStackTrace ();
}
catch (JavaLayerException e)
{
e.printStackTrace ();
}
}
}
这个需要jmf的相关包,去网上下载下,给你写了个例子
public class TestPlay extends JFrame {
private Component vc, cc;
private JButton file = new JButton("file");
private Player player = null;
public TestPlay() throws HeadlessException, NoPlayerException, MalformedURLException, IOException {
this.add(file);
file.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
JFileChooser f = new JFileChooser();
if(f.showOpenDialog(null)==JFileChooser.CANCEL_OPTION)return;
try {
player = Manager.createPlayer(f.getSelectedFile().toURL());
player.addControllerListener(new ControllerListener() {
public void controllerUpdate(ControllerEvent arg0) {
controllerUpdateImp(arg0);
}
});
player.prefetch();
} catch (Exception e) {
System.out.println(e);
JOptionPane.showMessageDialog(null, e.getMessage());
}
}
});
}
public void controllerUpdateImp(ControllerEvent e) {
if (e instanceof EndOfMediaEvent) {
player.setMediaTime(new Time(0));
player.start();
} else if (e instanceof PrefetchCompleteEvent) {
player.start();
} else if (e instanceof RealizeCompleteEvent) {
vc = player.getVisualComponent();
if (vc != null) this.add(vc, BorderLayout.CENTER);
cc = player.getControlPanelComponent();
if (cc != null) this.add(cc, BorderLayout.SOUTH);
this.pack();
this.setResizable(false);
this.setVisible(true);
} else if (e instanceof ControllerClosedEvent) {
System.exit(0);
}
}
public static void main(String[] args) {
TestPlay t;
try {
t = new TestPlay();
t.setDefaultCloseOperation(t.EXIT_ON_CLOSE);
t.pack();
t.setLocationRelativeTo(null);
t.setVisible(true);
} catch (Exception e) {
JOptionPane.showMessageDialog(null, e.getMessage());
}
}
}
// 你看看吧。。 必须下载 jmf包 如果不知道下载就问我吧
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import javax.media.bean.playerbean.MediaPlayer; //必须下载 jmf 媒体播放包
public class player extends Applet implements ActionListener {
Button b1, b2;
MediaPlayer player;
public void init() {
player = new MediaPlayer();
setLayout(new FlowLayout());
try{
player.setMediaLocation("file:/F:\\音乐\\mp3\\黑白配.mp3");// file:/不能删除 音频文件路径
} catch (Exception e) {
System.out.println("文件不存在");
}
b1 = new Button("播放");
b2 = new Button("停止");
add(b1);
add(b2);
b1.addActionListener(this);
b2.addActionListener(this);
setSize(200, 200);
setVisible(true);
}
public void actionPerformed(ActionEvent e) {
if (e.getSource() == b1) {
player.start();
} else if (e.getSource() == b2) {
player.stop();
System.out.println(player.getMediaTime().getSeconds());
}
}
}
