Java Filter¹ýÂËÆ÷ʹÓÃ
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1¡¢½¨Á¢Ò»¸öServlet²¢ÇÒʵÏÖFilter½Ó¿Ú
¸ÃÀàÐèҪʵÏÖFilter½Ó¿ÚÖеÄinit() doFilter() destory()·½·¨
ÆäÖÐinit()·½·¨×Ô¶¯ÔÚÏîÄ¿Æô¶¯µÄʱºò¼ÓÔØ£¬doFilter()ÔÚµ÷ÓÃxmlÅäÖõÄ·¾¶ÊǼÓÔØ£¬destory()·½·¨ÔÚÍ˳öÏîÄ¿µÄʱºò½øÐС£
public class TestFilter implements Filter{
public void init(FilterConfig filterConfig) throws ServletException{
System.out.println("³õʼ»¯Filter");
}
public void doFilter(ServletRequest request,ServletResponse response,FilterChain chain) throws Exception{
System.out.println("½øÐÐdoFilter");
chain(request,response); //ʹÓÃÕâÒ»¾ä¼ÌÐøServletÇëÇó
}
public void destory(){
System.out.println("¹ýÂËÆ÷Ïú»Ù");
}
}
2¡¢ÔÚxmlÖÐÅäÖÃFilter
<filter>
<filter-name></filter-name>
<filter-class></filter-class>
</filter>
<filter-mapping>
<filter-name></filter-name>
<url-pattern>/*</url-pattern> //ÕâÀïÏë¶ÔÄĸö·¾¶½øÐйýÂ˾ÍÌîдÄĸö
</filter-mapping>
Ó¦Óãº
±àÂë¹ýÂË
public void doFilter(ServletRequest request,ServletResponse response,FilterChain chain) throws Exception{
System.out.println("½øÐÐdoFilter"±àÂë¹ýÂË);
try
{
request.setCharacterEncoding("GB2312") ;
}
catch (Exception e)
{
e.printStackTrace();
}
chain.doFilter(request,response) ;
}
xmlÖеÄÅäÖãº
<url-pattern>/*</url-pattern> ¶ÔËùÓÐÇëÇó¶¼¹ýÂË
Ãô¸Ð´Ê»ã¹ýÂË
public void doFilter(ServletRequest request,
ServletResponse response,
FilterChain chain)
throws IOExce
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