package byd.core;
import java.io.IOException;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class GzipJsFilter implements Filter
{
@SuppressWarnings("unchecked")
Map headers = new HashMap();
public void destroy() { }
public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain)
throws IOException, ServletException {
if (req instanceof HttpServletRequest)
doFilter((HttpServletRequest)req, (HttpServletResponse)res, chain);
else
chain.doFilter(req, res);
}
@SuppressWarnings("unchecked")
public void doFilter(HttpServletRequest request, HttpServletResponse response,
FilterChain chain)
throws IOException, ServletException
{
request.setCharacterEncoding("UTF-8");
for (Iterator it = this.headers.entrySet().iterator(); it.hasNext(); ) {
Map.Entry entry = (Map.Entry)it.next();
response.addHeader((String)entry.getKey(), (String)entry.getValue());
}
chain.doFilter(request, response);
}
@SuppressWarnings("unchecked")
public void init(FilterConfig config) throws ServletException {
String headersStr = config.getInitParameter("headers");
String[] headers = headersStr.split(",");
for (int i = 0; i < headers.length; ++i) {
String[] temp = headers[i].split("=");
this.headers.put(temp[0].trim(), temp[1].trim());
}
}
}
<filter>
<filter-name>GzipJsFilter</filter-name>
<filter-class>com.byd.core.GzipJsFilter</filter-class>
<init-param>
<param-name>headers</param-name>
<param-value>Content-Encoding=gzip</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>GzipJsFilter</filter-name>
<url-pattern>*.gzjs</url-pattern>
</filter-mapping>