Filter

package filter;

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 SetCharacterEncodingFilter implements Filter{
private String encoding;
public void destroy() {

}

public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
request.setCharacterEncoding(encoding);
chain.doFilter(request,response);
response.setCharacterEncoding(encoding);
}

public void init(FilterConfig config) throws ServletException {
this.encoding=config.getInitParameter("encoding");
this.encoding=this.encoding==null?"gbk":this.encoding;
}

}

//filter在web.xml中的配置
<filter>
  <filter-name>setchara</filter-name>
  <filter-class>filter.SetCharacterEncodingFilter</filter-class>
  <init-param>
  <param-name>encoding</param-name>
  <param-value>gbk</param-value>
  </init-param>
  </filter>
  <filter-mapping>
  <filter-name>setchara</filter-name>
  <url-pattern>/*</url-pattern>
  </filter-mapping>

评论

2 楼 YYang5968 2011-10-17  

还有就是Filter能配置多少个初始化参数,只能有一个么?

1 楼 YYang5968 2011-10-17  

这样是不是说明配置Filter之后就不需要配置Servlet了?