java web中的过滤器
来源:百度知道 编辑:UC知道 时间:2024/05/17 22:13:32
一个请求发送到服务器然后服务器响应回来 ,是否2次经过过滤器的该方法?
过滤器执行的顺序是
//1.过滤器代码
.....
//2.让请求继续执行
filterChain.doFilter(request,response)//这句代码的意思是让请求往下继续执行
//3.执行完后,继续执行过滤器代码
....
//响应客户
public class EncodingFilter implements Filter {
private FilterConfig config;
private String targetEncoding;
public void init(FilterConfig config) {
this.config = config;
this.targetEncoding = this.config.getInitParameter("encoding");
}
public void doFilter(ServletRequest srequest, ServletResponse sresponse,
FilterChain chain) throws IOException, ServletException {
System.out.println("encoding=" + this.targetEncoding);
HttpServletRequest request = (HttpServletRequest) srequest;
request.setCharacterEncoding(this.targetEncoding);
chain.doFilter(srequest, sresponse);
}
public void setFilterConfig(final FilterConfig filterConfig) {
}
public void destroy() {
c