最近工作中，发现某些jsp页面，开头都写着如下内容，所以动手写了个过滤器来解决这个问题:
request.setCharacterEncoding("GBK");
response.setContentType("text/html;charset=GBK");
过滤器代码如下：
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.http.HttpServletResponse;
public class CharacterEncodingFilter implements Filter {
protected String encoding = null;
protected FilterConfig filterConfig = null;
public void destroy() {
this.encoding = null;
this.filterConfig = null;
}
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
if (request.getCharacterEncoding() == null) {
if (this.encoding != null){
request.setCharacterEncoding(encoding);
((HttpServletResponse) response).setContentType("text/html; charset=" + encoding);
}
}
chain.doFilter(request, response);
}
public void init(FilterConfig filterConfig) throws ServletException {
this.filterConfig = filterConfig;
this.encoding = filterConfig.getInitParameter("encoding");
}
}
web.xml修改如下：
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4"
xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<filter>
<filter-name>CharacterEncodingFilter</filter-name>
<filter-class>com.wangsoft.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>GBK</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>CharacterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
此代码经过测试，欢迎大家品评，共同提高！