引用:http://bbs.csdn.net/topics/390290685?page=1
Java code?
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public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.setCharacterEncoding( "utf-8" );
final long MAX_SIZE = 300 * 1024 * 1024 ; // 设置上传文件最大值
//允许上传文件格式的列表
final String[] allowedExt = new String[]{ "jpg" , "jpeg" , "gif" , "txt" , "doc" , "mp3" , "wma" , "m4a" , "rar" , "zip" };
response.setContentType( "text/html" );
// 设置字符编码为UTF-8, 统一编码,处理出现乱码问题
response.setCharacterEncoding( "UTF-8" );
// 实例化一个硬盘文件工厂,用来配置上传组件ServletFileUpload
DiskFileItemFactory dfif = new DiskFileItemFactory();
dfif.setSizeThreshold( 4096 ); // 设置上传文件时用于临时存放文件的内存大小,这里是4K.多于的部分将临时存在硬盘
dfif.setRepository( new File(request.getRealPath( "/" )+ "ImagesUploadTemp" ));
// 用以上工厂实例化上传组件
ServletFileUpload sfu = new ServletFileUpload(dfif);
//设置最大上传大小
sfu.setSizeMax(MAX_SIZE);
PrintWriter out = response.getWriter();
//从request得到所有上传域的列表
List fileList = null ;
try {
fileList = sfu.parseRequest(request);
} catch (FileUploadException e){
// 处理文件尺寸过大异常
if (e instanceof SizeLimitExceededException){
out.println( "文件尺寸超过规定大小:" + MAX_SIZE + "字节<p/>" );
out.println( "<a href=\"#\" >返回</a>" );
return ;
}
e.printStackTrace();
}
//没有文件上传
if (fileList == null || fileList.size() == 0 ){
out.println( "请选择上传文件<p/>" );
out.println( "<a href=\"#\" >返回</a>" );
return ;
}
//得到所有上传的文件
Iterator fileItr = fileList.iterator();
//循环处理所有文件
while (fileItr.hasNext()){
FileItem fileItem = null ;
String path = null ;
long size = 0 ;
//得到当前文件
fileItem = (FileItem) fileItr.next();
// 忽略简单form字段而不是上传域的文件域(<input type="text" />等)
if (fileItem == null || fileItem.isFormField())
{
continue ;
}
// 得到文件的完整路径
path = fileItem.getName();
// 得到文件的大小
size = fileItem.getSize();
if ( "" .equals(path) || size == 0 )
{
out.println( "请选择上传文件<p />" );
out.println( "<a href=\"#\" >返回</a>" );
return ;
}
// 得到去除路径的文件名
String t_name = path.substring(path.lastIndexOf( "//" ) + 1 );
// 得到文件的扩展名(无扩展名时将得到全名)
String t_ext = t_name.substring(t_name.lastIndexOf( "." ) + 1 );
// 拒绝接受规定文件格式之外的文件类型
int allowFlag = 0 ;
int allowedExtCount = allowedExt.length;
for (; allowFlag < allowedExtCount; allowFlag++)
{
if (allowedExt[allowFlag].equals(t_ext))
break ;
}
if (allowFlag == allowedExtCount)
{
out.println( "请上传以下类型的文件<p />" );
for (allowFlag = 0 ; allowFlag < allowedExtCount; allowFlag++)
out.println( "*." + allowedExt[allowFlag] + " " );
out.println( "<p /><a href=\"#\" >返回</a>" );
return ;
}
//long now = System.currentTimeMillis();
// 根据系统时间生成上传后保存的文件名
//String prefix = String.valueOf(now);
// 保存的最终文件完整路径,保存在web根目录下的ImagesUploaded目录下
// String u_name = request.getRealPath("/") + "ImagesUploaded/"
// + prefix + "." + t_ext;
String filename = t_name;
System.out.println(t_name);
try
{
// 保存文件到C://upload目录下
fileItem.write( new File( "C://upload//" + filename));
//System.out.println(filename);
out.println( "文件上传成功. 已保存为: " + filename + " 文件大小: " + size + "字节<p />" );
out.println( "<a href=\"#\" >继续上传</a>" );
} catch (Exception e)
{
e.printStackTrace();
}
}
}
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