File f = new File("c:\\测试.xls");
FileInputStream fin = new FileInputStream(f);
response.setContentType("application/vnd.ms-excel;charset=GB2312");
response.setHeader("Content-Disposition", "attachment; filename=测试.xls");
OutputStream output = response.getOutputStream();
byte[] buf = new byte[1024];
int r = 0;
while((r = fin.read(buf, 0, buf.length))!= -1) {
output.write(buf, 0, r);
}
fin.close();
output.close();
这段代码放在jsp中,点击jsp时,jsp中出现乱码,excel也没有下载到客户端
FileInputStream fin = new FileInputStream(f);
response.setContentType("application/vnd.ms-excel;charset=GB2312");
response.setHeader("Content-Disposition", "attachment; filename=测试.xls");
OutputStream output = response.getOutputStream();
byte[] buf = new byte[1024];
int r = 0;
while((r = fin.read(buf, 0, buf.length))!= -1) {
output.write(buf, 0, r);
}
fin.close();
output.close();
这段代码放在jsp中,点击jsp时,jsp中出现乱码,excel也没有下载到客户端
<%@ page import="java.io.*"%>
<%@ page contentType="text/html;charset=GBK"%>
<%!
public String toUtf8String(String s) {
StringBuffer sb = new StringBuffer();
for (int i=0;i<s.length();i++) {
char c = s.charAt(i);
if (c >= 0 && c <= 255) {
sb.append(c);
} else {
byte[] b;
try {
b = Character.toString(c).getBytes("utf-8");
} catch (Exception ex) {
System.out.println(ex);
b = new byte[0];
}
for (int j = 0; j < b.length; j++) {
int k = b[j];
if (k < 0) k += 256;
sb.append("%" + Integer.toHexString(k).
toUpperCase());
}
}
}
System.out.println("sb:"+sb.toString());
return sb.toString();
}
%>
<%
request.setCharacterEncoding("GBK");
//文件名
String filename = request.getParameter("filenme");
//服务器相关程序下的相对路径,完整路径:export/home/process/web/test/data/images
String dirName=application.getRealPath("test/data/images");
java.io.File strFile=null;
String strPath=dirName+System.getProperties().getProperty("file.separator")+filename;
System.out.println("生成图片路径:"+strPath);
try{
strFile=new java.io.File(strPath);
}catch(Exception e){
e.printStackTrace();
}
if (strFile!=null&&strFile.exists()&&strFile.isFile())
{
long filelength = strFile.length();
OutputStream outputStream = response.getOutputStream();
InputStream inputStream = new FileInputStream(strPath);
//设置输出的格式
response.reset();
response.setContentType("application/x-msdownload");
response.setContentLength((int)filelength);
response.addHeader("Content-Disposition","attachment; filename=\"" + toUtf8String(filename) + "\"");
//循环取出流中的数据
byte[] b = new byte[1024];
int len=-1;
while((len=inputStream.read(b))!=-1){
outputStream.write(b, 0, len);
}
outputStream.flush();
outputStream.close();
inputStream.close();
outputStream = null;
}
%>
File f = new File(request.getRealPath()+"\\测试.xls");
这样就可以通过ie访问这个文件了
然后在web.xml里加
<mime-mapping>
<extension>doc</extension>
<mime-type>application/msword</mime-type>
</mime-mapping>
<mime-mapping>
<extension>xls</extension>
<mime-type>application/msexcel</mime-type>
</mime-mapping>
这样就可以正常打开word和excel了
2、下载处理页面do_download.jsp do_download.jsp展示了如何利用jspSmartUpload组件来下载文件,从下面的源码中就可以看到,下载何其简单。 源码如下:
<%@ page contentType="text/html;charset=gb2312" import="com.jspsmart.upload.*" %><% // 新建一个SmartUpload对象 SmartUpload su = new SmartUpload(); // 初始化 su.initialize(pageContext); // 设定contentDisposition为null以禁止浏览器自动打开文件, //保证点击链接后是下载文件。若不设定,则下载的文件扩展名为 //doc时,浏览器将自动用word打开它。扩展名为pdf时, //浏览器将用acrobat打开。 su.setContentDisposition(null); // 下载文件 su.downloadFile("/upload/如何赚取我的第一桶金.doc");%>
注意,执行下载的页面,在Java脚本范围外(即<% ... %>之外),不要包含HTML代码、空格、回车或换行等字符,有的话将不能正确下载。不信的话,可以在上述源码中%><%之间加入一个换行符,再下载一下,保证出错。因为它影响了返回给浏览器的数据流,导致解析出错。 3、如何下载中文文件 jspSmartUpload虽然能下载文件,但对中文支持不足。若下载的文件名中有汉字,则浏览器在提示另存的文件名时,显示的是一堆乱码,很扫人兴。上面的例子就是这样。(这个问题也是众多下载组件所存在的问题,很少有人解决,搜索不到相关资料,可叹!) 为了给jspSmartUpload组件增加下载中文文件的支持,我对该组件进行了研究,发现对返回给浏览器的另存文件名进行UTF-8编码后,浏览器便能正确显示中文名字了。这是一个令人高兴的发现。于是我对jspSmartUpload组件的SmartUpload类做了升级处理,增加了toUtf8String这个方法,改动部分源码如下:
public void downloadFile(String s, String s1, String s2, int i) throws ServletException, IOException, SmartUploadException { if(s == null) throw new IllegalArgumentException("File '" + s + "' not found (1040)."); if(s.equals("")) throw new IllegalArgumentException("File '" + s + "' not found (1040)."); if(!isVirtual(s) && m_denyPhysicalPath) throw new SecurityException("Physical path is denied (1035)."); if(isVirtual(s)) s = m_application.getRealPath(s); java.io.File file = new java.io.File(s); FileInputStream fileinputstream = new FileInputStream(file); long l = file.length(); boolean flag = false; int k = 0; byte abyte0[] = new byte[i]; if(s1 == null) m_response.setContentType("application/x-msdownload"); else if(s1.length() == 0) m_response.setContentType("application/x-msdownload"); else m_response.setContentType(s1); m_response.setContentLength((int)l); m_contentDisposition = m_contentDisposition != null ? m_contentDisposition : "attachment;"; if(s2 == null) m_response.setHeader("Content-Disposition", m_contentDisposition + " filename=" + toUtf8String(getFileName(s))); else if(s2.length() == 0) m_response.setHeader("Content-Disposition", m_contentDisposition); else m_response.setHeader("Content-Disposition", m_contentDisposition + " filename=" + toUtf8String(s2)); while((long)k < l) { int j = fileinputstream.read(abyte0, 0, i); k += j; m_response.getOutputStream().write(abyte0, 0, j); } fileinputstream.close(); } /** * 将文件名中的汉字转为UTF8编码的串,以便下载时能正确显示另存的文件名. * 纵横软件制作中心雨亦奇2003.08.01 * @param s 原文件名 * @return 重新编码后的文件名 */ public static String toUtf8String(String s) { StringBuffer sb = new StringBuffer(); for (int i=0;i<s.length();i++) { char c = s.charAt(i); if (c >= 0 && c <= 255) { sb.append(c); } else { byte[] b; try { b = Character.toString(c).getBytes("utf-8"); } catch (Exception ex) { System.out.println(ex); b = new byte[0]; } for (int j = 0; j < b.length; j++) { int k = b[j]; if (k < 0) k += 256; sb.append("%" + Integer.toHexString(k). toUpperCase()); } } } return sb.toString(); }
注意源码中粗体部分,原jspSmartUpload组件对返回的文件未作任何处理,现在做了编码的转换工作,将文件名转换为UTF-8形式的编码形式。UTF-8编码对英文未作任何处理,对中文则需要转换为%XX的形式。toUtf8String方法中,直接利用Java语言提供的编码转换方法获得汉字字符的UTF-8编码,之后将其转换为%XX的形式。 将源码编译后打包成jspSmartUpload.jar,拷贝到Tomcat的shared/lib目录下(可为所有WEB应用程序所共享),然后重启Tomcat服务器就可以正常下载含有中文名字的文件了。另,toUtf8String方法也可用于转换含有中文的超级链接,以保证链接的有效,因为有的WEB服务器不支持中文链接。 小结:jspSmartUpload组件是应用JSP进行B/S程序开发过程中经常使用的上传下载组件,它使用简单,方便。现在我又为其加上了下载中文名字的文件的支持,真个是如虎添翼,必将赢得更多开发者的青睐。
ServletOutputStream outputStream = null;
File file = new File(path);
reader = new FileInputStream(file); outputStream = response.getOutputStream();
setResponseBeforeDownload(
response, fileName);
int len = 0;
if (outputStream != null) {
final byte[] c = new byte[2048];
while ((len = reader.read(c)) > 0) {
outputStream.write(c, 0, len);
}
} if (outputStream != null) {
outputStream.close();
}
if (reader != null) {
reader.close();
}
}
public static final void setResponseBeforeDownload(
HttpServletResponse response,
String filename)
throws ZZServerException {
try {
response.setCharacterEncoding("Shift_JIS");
response.setContentType("application/x-msbinary");
response.setHeader(
"Content-Disposition",
"attachment; filename="
+ new String(filename.getBytes("Shift_JIS"), "ISO8859_1"));
} catch (UnsupportedEncodingException e) {
}
}
<%@ page language="java" import="java.util.*,java.io.*" pageEncoding="gbk"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP '1.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
<%
File file = new File("c:\\test.xls");
FileInputStream inStream = new FileInputStream(file);
String to = request.getRealPath("")+"/test.xls";
String path = request.getContextPath();
FileOutputStream outStream = new FileOutputStream(to);
int bytesRead = 0;
byte[] b = new byte[8192];
while ((bytesRead = inStream.read(b, 0, 8192)) != -1) {
outStream.write(b, 0, bytesRead);
}
inStream.close();
outStream.close();
response.sendRedirect(path+"/test.xls");
%>
</body>
</html>注意要在web.xml里加
<mime-mapping>
<extension>doc</extension>
<mime-type>application/msword</mime-type>
</mime-mapping>
<mime-mapping>
<extension>xls</extension>
<mime-type>application/msexcel</mime-type>
</mime-mapping>
我这个是,一点击down.jsp页面就出现了大面积的乱码,后台还没有错误
su.downloadFile("/upload/ddd.doc");
FileInputStream fin = new FileInputStream(f);
OutputStream output = response.getOutputStream();
byte[] buf = new byte[1024];
int r = 0;
response.setContentType("application/vnd.ms-excel;charset=GB2312");
response.setHeader("Content-Disposition", "attachment; filename=测试.xls");
while((r = fin.read(buf, 0, buf.length))!= -1) {
output.write(buf, 0, r);
}
fin.close();
output.close();
LZ你这样写就没有乱玛问题了 而且可以下载的(我已经验证了)