//若为txt文档
if([encodedString hasSuffix:@".txt"]){
NSData* Data = [NSData dataWithContentsOfURL:weburl];
NSString* aStr = [[NSString alloc] initWithData:Data encoding:NSUTF8StringEncoding];
if (!aStr) {
aStr=[[NSString alloc] initWithData:Data encoding:0x80000632];
}
if (!aStr) {
aStr=[[NSString alloc] initWithData:Data encoding:0x80000631];
}
// NSString* aStr = [[NSString alloc] initWithData:Data encoding:0x80000632];
NSString* responseStr = [NSString stringWithFormat:
@"<HTML>"
"<head>"
"<title>Text View</title>"
"</head>"
"<BODY>"
"<pre>"
"%@"
"</pre>"
"</BODY>"
"</HTML>",
aStr];
[showPdfWebview loadHTMLString:responseStr baseURL:weburl];
[aStr release];