package com.jsp.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{
protected String encoding=null;
protected FilterConfig filterConfig=null;
protected boolean ignore=true;
public void destroy(){
this.encoding=null;
this.filterConfig=null;
}
public void doFilter(ServletRequest request,ServletResponseresponse,FilterChain chain)
throwsIOException,ServletException{
if(ignore||(request.getCharacterEncoding()==null)){
Stringencoding=selectEncoding(request);
if(encoding!=null)
request.setCharacterEncoding(encoding);
}
chain.doFilter(request,response);
}
public voidinit(FilterConfig filterConfig) throws ServletException{
this.filterConfig=filterConfig;
this.encoding=filterConfig.getInitParameter("encoding");
Stringvalue=filterConfig.getInitParameter("ignore");
if(value==null) this.ignore=true;
else if(value.equalsIgnoreCase("true"))this.ignore=true;
else if(value.equalsIgnoreCase("yes"))this.ignore=true;
else this.ignore=false;
}
protected String selectEncoding (ServletRequest request){
return (this.encoding);
}
}
還需要配置xml文件。只要在xml文件里加入以下一段代碼即可。
<filter>
<filter-name>setcharcode</filter-name>
<filter-class>com.jsp.filter.SetCharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>setcharcode</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
處理網頁中文亂碼的方法很多，過濾器只是一種。