我想做这样一个下载资源的页面:
请点击此链接下载(也可以点击右键直接下载):http://192.168.74.146/upload/audio/谢谢你的爱 - 刘德华.mp3
上面的是一个链接,点击之后可以直接下载,也可以用右键迅雷下载之类的,该怎么弄,高手指导一下
请点击此链接下载(也可以点击右键直接下载):http://192.168.74.146/upload/audio/谢谢你的爱 - 刘德华.mp3
上面的是一个链接,点击之后可以直接下载,也可以用右键迅雷下载之类的,该怎么弄,高手指导一下
<input type="file" name="file1">
<br>
<input type="file" name="file2">
<br>
<input type="file" name="file3">
<input type="submit" value="upload" />
<br>
<br>
<a href="servlet/down?downFile=入门教程.doc">down</a>
</form>2、在servlet(Upload.java)中的dopost中写代码如下:response.setContentType("text/html; charset=gb2312");
// 要下载的文件名
// 之所以这样处理,主要是因为文件名的中文化问题,这样处理的话,中文文件名也会正常显示
String aa=new String((request.getParameter("file1"))
.getBytes("iso8859-1"), "gb2312");
String bb=new String((request.getParameter("file2"))
.getBytes("iso8859-1"), "gb2312");
String cc=new String((request.getParameter("file3"))
.getBytes("iso8859-1"), "gb2312");
List<String> list = new ArrayList<String>();
if(aa!=null || !aa.equals(""))
list.add(aa);
if(!bb.equals("") || bb!=null)
list.add(bb);
if(cc!=null || !cc.equals(""))
list.add(cc);
// 建立上传文件存放的路径
File uploadPath = new File(request.getRealPath("/downloadPath") );
System.out.println(uploadPath );
if (!uploadPath.exists()) {
uploadPath.mkdirs();
}
for (int i = 0; i < list.size(); i++) {
String fileName[] = new String[list.size()];
String exFileName[] = new String[list.size()];
// 文件路径
String filePath = list.get(i);
// 取上传的文件名称
fileName[i] = filePath.substring(filePath.lastIndexOf("\\") + 1,
filePath.length());
// 取文件的扩展名称
// exFileName[i] = filePath.substring(filePath.lastIndexOf("." + 1,
// filePath.length()));
// 在存放的目录下新建文件
File uploadFileName = new File(uploadPath, fileName[i]);
if (!uploadFileName.exists()) {
uploadFileName.createNewFile();
}
FileInputStream fin=new FileInputStream(filePath);
// 向服务器写入文件
java.io.FileOutputStream fos = new java.io.FileOutputStream(uploadPath + "/" + fileName[i]);
int c = fin.read();
while (c != -1) {
fos.write((char)c);
c=fin.read();
}
fin.close();
fos.close();
}4、下载servlet(down.java)的doget方法下代码如下:response.setContentType("text/html; charset=gb2312");
HttpSession session = request.getSession();
// 要下载的文件名
String downloadfile = new String((request.getParameter("downFile"))
.getBytes("iso8859-1"), "gb2312"); ServletContext context = getServletContext();
ServletConfig config = getServletConfig(); // 获取要下载文件所在的目录,这里是对应于服务器上的物理路径
// 目录的格式是这样的:
// 根目录(WEB主目录所对应的实际物理目录)
// +虚拟目录(下载文件存放的子目录)
String downloadpath = context.getRealPath(File.separator)
+ "downloadPath" + File.separator;
System.out.println(downloadpath);
// 构建下载文件的对象
java.io.File file = new java.io.File(downloadpath + downloadfile);
// 获得文件的长度
long filesize = file.length();
// 设置输出格式
response.addHeader("content-type", "application/x-msdownload;");
response.addHeader("Content-Disposition", "attachment; filename="
+ response.encodeURL(downloadfile));//你要在保存窗口中显示的保存文件名
response.addHeader("content-length", Long.toString(filesize));
// 向客户端写入文件
java.io.FileInputStream fin = new java.io.FileInputStream(file);
byte[] b = new byte[1];
int j = 0;
while ((j = fin.read(b)) > 0) {
response.getOutputStream().write(b);
}
fin.close(); 3、web.xml文件配置<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4"
xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<servlet>
<description>This is the description of my J2EE component</description>
<display-name>This is the display name of my J2EE component</display-name>
<servlet-name>Upload</servlet-name>
<servlet-class>com.Upload</servlet-class>
</servlet>
<servlet>
<description>This is the description of my J2EE component</description>
<display-name>This is the display name of my J2EE component</display-name>
<servlet-name>down</servlet-name>
<servlet-class>com.down</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Upload</servlet-name>
<url-pattern>/servlet/Upload</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>down</servlet-name>
<url-pattern>/servlet/down</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>