Spring MVC 3.1 - Request Header Character Encoding issue [UTF-8]

Question

I'm trying to get file name from request header, I'm getting character encoding problem despite I have defined Spring encoding filter in my web.xml.

String fileName = request.getHeader("X-File-Name"); // wrong encoding

web.xml

        <filter-name>CharacterEncodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
        <init-param>
            <param-name>forceEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>

    <filter-mapping>
        <filter-name>CharacterEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

Also I've added URIEncoding="UTF-8" config into Tomcat server.xml file. And added same config JAVA_OPTS too.

-DuriEncoding=UTF-8 -Dfile.encoding=UTF-8

Esailija · Accepted Answer · 2012-12-11 23:00:01Z

2

Well if the headers are always in UTF-8 (or ascii otherwise), you could do this:

public static String reEncode( String input ) {
    Charset w1252 = Charset.forName("Windows-1252"); //Superset of ISO-8859-1
    Charset utf8 = Charset.forName("UTF-8");
    return new String(input.getBytes(w1252), utf8 );
}

...

String fileName = reEncode("MekanizmasÄ±.pdf"); //request.getHeader("X-File-Name")
System.out.println(fileName); //Mekanizması.pdf

answered Dec 11, 2012 at 23:00

Esailija

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3 Comments

talha06 Over a year ago

thank you so much Esailija for your help, now I'm able to get the right value.

Michael-O Over a year ago

Very brittle, since there so char encoding guarantee for HTTP headers.

Esailija Over a year ago

@Michael-O yes, that's why it says either UTF-8 or ASCII. If it's in some other random encoding, he will see mojibake. I would recommend a normal query parameter as well, fwiw.

Michael-O · Accepted Answer · 2012-12-11 19:58:10Z

0

There is no encoding defined for HTTP headers. Expect them to support at most ISO-8859-1. Better rely on US-ASCII. The param is, as the name says, for URIs and their params. Nothing else.

answered Dec 11, 2012 at 19:58

Michael-O

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4 Comments

talha06 Over a year ago

I see, so how can I get the right value of file from HTTP-Header?

Esailija Over a year ago

@talha06 what is the value you are getting now?

talha06 Over a year ago

for example I'm getting "Onay MekanizmasÄ±.pdf" instead of "Onay Mekanizması.pdf" which is the right file name.

Michael-O Over a year ago

Forget about the header. ARe you performing a PUT?. If yes, use the URI. This is the only safe way. If you are POSTing with multipart. This works automatically.

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