SHH完整开发的航空票务系统

package bit.jeffy.util; 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 EncodingFilter implements Filter { // public void destroy() { // // TODO Auto-generated method stub // // } // // public void doFilter(ServletRequest arg0, ServletResponse arg1, // FilterChain arg2) throws IOException, ServletException { // // TODO Auto-generated method stub // // } // // public void init(FilterConfig arg0) throws ServletException { // // TODO Auto-generated method stub // // } /** * The default character encoding to set for requests that pass through this * filter. */ protected String encoding = null; /** * The filter configuration object we are associated with. If this value is * null, this filter instance is not currently configured. */ protected FilterConfig filterConfig = null; /** * Should a character encoding specified by the client be ignored? */ protected boolean ignore = true; /** * Take this filter out of service. */ public void destroy() { this.encoding = null; this.filterConfig = null; } /** * Select and set (if specified) the character encoding to be used to * interpret request parameters for this request. * * @param request * The servlet request we are processing * @param result * The servlet response we are creating * @param chain * The filter chain we are processing * * @exception IOException * if an input/output error occurs * @exception ServletException * if a servlet error occurs */ public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { if (ignore || (request.getCharacterEncoding() == null)) { request.setCharacterEncoding(selectEncoding(request)); } chain.doFilter(request, response); } /** * Place this filter into service. * * @param filterConfig * The filter configuration object */ public void init(FilterConfig filterConfig) throws ServletException { this.filterConfig = filterConfig; this.encoding = filterConfig.getInitParameter("encoding"); String value = filterConfig.getInitParameter("ignore"); if (value == null) this.ignore = true; else if (value.equalsIgnoreCase("true") || value.equalsIgnoreCase("yes")) this.ignore = true; else this.ignore = false; } /** * Select an appropriate character encoding to be used, based on the * characteristics of the current request and/or filter initialization * parameters. If no character encoding should be set, return * ��code��null��/code��. ��p�� The default implementation unconditionally returns * the value configured by the ��strong��encoding��/strong�� initialization * parameter for this filter. * * @param request * The servlet request we are processing */ protected String selectEncoding(ServletRequest request) { return (this.encoding); } /** * Returns the filterConfig. * * @return FilterConfig */ public FilterConfig getFilterConfig() { return filterConfig; } /** * Sets the filterConfig. * * @param filterConfig * The filterConfig to set */ public void setFilterConfig(FilterConfig filterConfig) { this.filterConfig = filterConfig; } }