| ＜filter＞ ＜filter-name＞Set Character Encoding＜/filter-name＞ ＜filter-class＞com.company.demo.util.SetEncodingFilter＜/filter-class＞ ＜init-param＞ ＜param-name＞encoding＜/param-name＞ ＜param-value＞gb2312＜/param-value＞ ＜/init-param＞ ＜/filter＞ ＜filter-mapping＞ ＜filter-name＞Set Character Encoding＜/filter-name＞ ＜url-pattern＞/*＜/url-pattern＞ ＜/filter-mapping＞ ＜servlet＞ |
| package com.company.demo.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; import javax.servlet.UnavailableException; /** * Set All HttPRequest Encoding */ public class SetEncodingFilter implements Filter { /** * 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; } } |
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