关于过滤器和重定向请求执行顺序的问题
FirstFilter.java
@Override
public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2)
throws IOException, ServletException {
System.out.println("Start.....doFilter----FirstFilter");
// arg2.doFilter(arg0, arg1);
HttpServletRequest req = (HttpServletRequest) arg0;
HttpServletResponse response2 = (HttpServletResponse) arg1;
// 重定向
response2.sendRedirect(req.getContextPath() + "/main.jsp");
System.out.println("End.....doFilter----FirstFilter");
}
web.xml
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<filter>
<filter-name>FirstFilter</filter-name>
<filter-class>com.filter.FirstFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>FirstFilter</filter-name>
<url-pattern>/index.jsp</url-pattern>
</filter-mapping>
<filter-mapping>
<filter-name>FirstFilter</filter-name>
<url-pattern>/main.jsp</url-pattern>
<dispatcher>FORWARD</dispatcher>
</filter-mapping>
index.jsp
一个打印输出语句
<%
System.out.println("index.jsp");
%>
main.jsp
一个打印输出语句
<%
System.out.println("main.jsp");
%>
访问工程下面的index.jsp，控制台输出的结果是
Start.....doFilter----FirstFilter
End.....doFilter----FirstFilter
main.jsp
为什么不是先
main.jsp
后输出
End.....doFilter----FirstFilter
