Set response encoding in embedded tomcat

Question

Is there a way to set response encoding in embedded tomcat? By far I could only find setting URI encoding. But I need to set the response encoding.

The surprise is, standalone tomcat is by default sending data in UTF-8.

just use setCharacterEncoding method of ServletResponse class avaliable in HttpServletResponse to set response encoding if you dont want to use filter. — Kunal Surana, Feb 15 '16 at 11:43

score 0 · Answer 1 · answered Feb 15 '16 at 11:41

0

You can create a filter to set your response encoding

import java.io.IOException;  
import java.io.PrintWriter;  

import javax.servlet.*;  

public class MyFilter implements Filter{  

public void init(FilterConfig arg0) throws ServletException {}  

public void doFilter(ServletRequest req, ServletResponse resp,  
    FilterChain chain) throws IOException, ServletException {  

    resp.setCharacterEncoding("text/plain; charset=UTF-8"); 

    chain.doFilter(req, resp);//sends request to next resource  


    }  
public void destroy() {}  
}

answered Feb 15 '16 at 11:41

Kunal Surana

659
5
14

I am using embedded tomcat. I tried setting setCharacterEncoding("UTF-8"). Though the HTTP response header sends the encoding, the browser is not properly showing the characters. – Venkata Jaswanth Feb 15 '16 at 11:54
use setCharacterEncoding("text/html; charset=UTF-8"); see [link](https://tomcat.apache.org/tomcat-5.5-doc/servletapi/javax/servlet/ServletResponse.html#setCharacterEncoding(java.lang.String)) – Kunal Surana Feb 15 '16 at 11:56
But, the problem is it works fine on jetty and standalone tomcat. Embedded tomcat version is 8.0.12, is this a cause? – Venkata Jaswanth Feb 15 '16 at 12:04
Servlet Specification is same for all containers. issue is something else. Please try to add this in web.xml *.jsp UTF-8 – Kunal Surana Feb 15 '16 at 12:11
I am not using JSPs. It serves html directly. – Venkata Jaswanth Feb 15 '16 at 12:12
add following in html page : – Kunal Surana Feb 15 '16 at 13:29

score 0 · Answer 2 · answered Feb 15 '16 at 14:13

Create filter:

`package charsetFilter.classes;

 import java.io.IOException;
 import javax.servlet.Filter;
 import javax.servlet.FilterChain;
 import javax.servlet.FilterConfig;
 import javax.servlet.ServletException;
 import javax.servlet.ServletRequest;
 import javax.servlet.ServletResponse;

public class CharsetFilter implements Filter{
    private String encoding;

    public void init(FilterConfig config) throws ServletException{
            encoding = config.getInitParameter("requestEncoding");
            if( encoding==null ) encoding="UTF-8";
    }

    public void doFilter(ServletRequest request, ServletResponse response, FilterChain       next)
    throws IOException, ServletException{
        // Respect the client-specified character encoding
        // (see HTTP specification section 3.4.1)
            if(null == request.getCharacterEncoding())
            request.setCharacterEncoding(encoding);
            /**
        * Set the default response content type and encoding
        */
        response.setContentType("text/html; charset=UTF-8");
        response.setCharacterEncoding("UTF-8");
            next.doFilter(request, response);
    }

        public void destroy(){}
}`

Add this filter in web.xml as:

`<filter>
        <filter-name>CharsetFilter</filter-name>
        <filter-class>charsetFilter.classes.CharsetFilter</filter-class>
            <init-param>
                <param-name>requestEncoding</param-name>
                <param-value>UTF-8</param-value>
            </init-param>
</filter>

<filter-mapping>
        <filter-name>CharsetFilter</filter-name>
        <url-pattern>/*</url-pattern>
</filter-mapping>`

HTML-meta tags should be written in all HTML files:
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="fi"> <head> <meta http-equiv='Content-Type' content='text/html; charset=UTF-8' />
Set your servlet as:
request.setCharacterEncoding("UTF-8"); response.setContentType("text/html; charset=UTF-8"); response.setCharacterEncoding("UTF-8");
Deal with servlet requests as:
String input = new String(request.getParameter("foo").getBytes("iso-8859-1"), "utf-8"); String input = URLDecoder.decode(request.getParameter("keyWord"), "UTF-8");

Let me know if you still have problems

Set response encoding in embedded tomcat

2 Answers2