jspsmart制作文件下载的问题?(100相送) to bigbuiding () :我的问题好象与你遇到的相似,能否告解你是怎么处理的? 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 lhyao (茅台) 遇到同样的问题,如下:我使用jspSmartLoad在上传文件文件的时候问题不大,在下载的时候发现如果文件的大小一旦小于64k的时候,下载就会报错:org.apache.jasper.JasperException: getOutputStream() has already been called for this responsejava.lang.IllegalStateException: getOutputStream() has already been called for this response而文件大小只要超过64k就会一些OK了,真是不明白。我是使用struts来开发的,在jspSmartLoad中打上断点,中间不会报错,流程也会走完,就是到了最后显示下载的时候出现问题。真的很郁闷!解决:改动代码:public class SmartUpload{...public void downloadFile(String s, String s1, String s2, int i){...while ((long) k < l) { int j = fileinputstream.read(abyte0, 0, i); k += j; m_response.getOutputStream().write(abyte0, 0, j); //添加以下代码 m_response.flushBuffer();}...}...}解决中文文件名下载问题(含小于64K小文件下载问题):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); //解决小于64K文件的下载错误的问题(清一下缓存就行了) m_response.flushBuffer(); } 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(); } 小颖JAVA源代码反编译超级引挚 V1.4 标准版 http://www.kxia.com/soft/16338.htm 问题已经解决,并且解决了中文问题以及小于64K出错的问题,并重新编译了jspsmart类,如果那位想要将发邮件到[email protected]索取!太高兴了,感谢lhyao (茅台)的提示以及雨亦奇的代码!谢谢 上面代码有个bug,解决了小于64K文件的问题,又去出现了大文件内存溢出的问题,现将类修改如下: 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); //解决小于64K文件的下载错误的问题(清一下缓存就行了) if(this.getSize()<=64*1024) m_response.flushBuffer(); } fileinputstream.close(); } JSTL的问题 简单 配置了Hibernate后还要在数据库里画关系图吗? struts2页面的显示问题 怎么实现导出数据库,就是用java调用数据库的备份SQl语句 实现导出数据库脚本 replaceall()过滤 这是什么错误呀? 万分火急,请大家帮忙解决一个中文字符传递的问题; 封装文件上传功能的问题,pageContext参数 一个简单的jsp啊~!怎么不行啊~! 我用resin+jsp做,希望客户端之间互传文件,如何实现 我想在JSP中用相对路径访问数据库,但是我用一个小程序测试的时候就不不能访问到数据库,程序内容如下,请高手指导一下,谢谢 文件路问题
我使用jspSmartLoad在上传文件文件的时候问题不大,在下载的时候发现如果文件的大小一旦小于64k的时候,下载就会报错:org.apache.jasper.JasperException: getOutputStream() has already been called for this responsejava.lang.IllegalStateException: getOutputStream() has already been called for this response而文件大小只要超过64k就会一些OK了,真是不明白。我是使用struts来开发的,在jspSmartLoad中打上断点,中间不会报错,流程也会走完,就是到了最后显示下载的时候出现问题。真的很郁闷!
解决:
改动代码:
public class SmartUpload
{
...
public void downloadFile(String s, String s1, String s2, int i)
{
...
while ((long) k < l)
{
int j = fileinputstream.read(abyte0, 0, i);
k += j;
m_response.getOutputStream().write(abyte0, 0, j);
//添加以下代码
m_response.flushBuffer();
}
...
}
...
}
解决中文文件名下载问题(含小于64K小文件下载问题):
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);
//解决小于64K文件的下载错误的问题(清一下缓存就行了)
m_response.flushBuffer();
}
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();
}
http://www.kxia.com/soft/16338.htm
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);
//解决小于64K文件的下载错误的问题(清一下缓存就行了)
if(this.getSize()<=64*1024)
m_response.flushBuffer();
}
fileinputstream.close();
}