Question

web.xml lt;filter-mapping>我不想过滤html文件，怎么设置

Answer 1

不使用 /* 拦截所有，拦截想拦截的就可以了

类似下面的过滤方式
<filter>
<filter-name>encodingFilter</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>encodingFilter</filter-name>
<url-pattern>*.action</url-pattern>
</filter-mapping>
<filter-mapping>
<filter-name>encodingFilter</filter-name>
<url-pattern>*.usl</url-pattern>
</filter-mapping>
<filter-mapping>
<filter-name>encodingFilter</filter-name>
<url-pattern>*.jsp</url-pattern>
</filter-mapping>
<filter-mapping>
<filter-name>encodingFilter</filter-name>
<url-pattern>*.view</url-pattern>
</filter-mapping>
<filter-mapping>
<filter-name>encodingFilter</filter-name>
<url-pattern>/jaxrs/*</url-pattern>
</filter-mapping>
在filter类中判断一下，如果是.html结尾的就不过滤。
HttpServletRequest req = (HttpServletRequest)request;
//由于web.xml中设置Filter过滤全部请求，可以排除不需要过滤的url
String reqURI = req.getRequestURI();
if(reqURI.endsWith(".html")) chain.doFilter(request, response);
HttpServletRequest req = (HttpServletRequest)request;
//由于web.xml中设置Filter过滤全部请求，可以排除不需要过滤的url
String reqURI = req.getRequestURI();
if(reqURI.endsWith(".html")) chain.doFilter(request, response);

chain是以下过滤方法中的chain吗？
public void doFilter(ServletRequest request,
ServletResponse response,
FilterChain chain) throws IOException, ServletException{

另外， if(reqURI.endsWith(".html")) 到底是 真还是假

HttpServletRequest req = (HttpServletRequest)request;
//由于web.xml中设置Filter过滤全部请求，可以排除不需要过滤的url
String reqURI = req.getRequestURI();
if(reqURI.endsWith(".html")) chain.doFilter(request, response);

chain是以下过滤方法中的chain吗？
public void doFilter(ServletRequest request,
ServletResponse response,
FilterChain chain) throws IOException, ServletException{

另外， if(reqURI.endsWith(".html")) 到底是 真还是假

就是这个chain，这个判断就是判断你放问的路径是否以.html结尾，你可以试试。

HttpServletRequest req = (HttpServletRequest)request;
//由于web.xml中设置Filter过滤全部请求，可以排除不需要过滤的url
String reqURI = req.getRequestURI();
if(reqURI.endsWith(".html")) chain.doFilter(request, response);

chain是以下过滤方法中的chain吗？
public void doFilter(ServletRequest request,
ServletResponse response,
FilterChain chain) throws IOException, ServletException{

另外， if(reqURI.endsWith(".html")) 到底是 真还是假

就是这个chain，这个判断就是判断你放问的路径是否以.html结尾，你可以试试。

报错
java.lang.IllegalStateException: getWriter() has already been called for this response
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
//把ServletRequest和ServletResponse转换成真正的类型
HttpServletRequest req = (HttpServletRequest)request;
String reqURI = req.getRequestURI();
if(reqURI.endsWith(".do")) chain.doFilter(request, response);
System.out.println(reqURI);
chain.doFilter(request, response);
}

我这里用过的原代码，没错，你看下你别的地方，用到response的地方
//把ServletRequest转换成真正的类型
HttpServletRequest req = (HttpServletRequest)request;
String reqURI = req.getRequestURI();
if(reqURI.endsWith(".html")) chain.doFilter(request, response);
else{
return;
}

这个是我刚才测试了的，只有html结尾的可以过。

Answer 2

你可以设置想过滤的动作，这样就不过滤html了。比如下面这样：
<filter-mapping>
<filter-name>encodingFilter</filter-name>
<url-pattern>*.action</url-pattern>
</filter-mapping>
<filter-mapping>
<filter-name>encodingFilter</filter-name>
<url-pattern>*.usl</url-pattern>
</filter-mapping>
<filter-mapping>
<filter-name>encodingFilter</filter-name>
<url-pattern>*.jsp</url-pattern>
</filter-mapping>