真的不知到怎么回事，过滤器把图片给过滤了！

Question

web.xml
<filter>
<display-name>AuthorizationFilter</display-name>
<filter-name>AuthorizationFilter</filter-name>
<filter-class>org.iflysse.training.filter.AuthorizationFilter</filter-class>
<init-param>
<param-name>excludes</param-name>
<param-value>/LoginServlet,/login.jsp,/SendXiaoXiServlet,/files/sendxiaoxi.jsp</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>AuthorizationFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
AuthorizationFilter.java
import java.io.IOException;
import java.util.ArrayList;import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;/*
 * Servlet Filter implementation class AuthorizationFilter
 */
public class AuthorizationFilter implements Filter {

private ArrayList<String> excludes = new ArrayList<String>();
@Override
public void init(FilterConfig config) throws ServletException {
String s = config.getInitParameter("excludes");
String[] ary = s.split(",");
for (String a : ary) {
excludes.add(a.trim());
}
}
@Override
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException { HttpServletRequest httpServletRequest = (HttpServletRequest) request;
HttpServletResponse httpServletResponse = (HttpServletResponse) response; String uri = httpServletRequest.getRequestURI(); for (String exclude : excludes) {
if (uri.endsWith(exclude)) {
request.setCharacterEncoding("utf-8");
response.setCharacterEncoding("utf-8");
chain.doFilter(request, response);
return;
}
} Object o = httpServletRequest.getSession().getAttribute("userName");
if (o == null) {
String contaxt = httpServletRequest.getContextPath();
httpServletResponse.sendRedirect(contaxt + "/login.jsp");
return;
}

chain.doFilter(request, response);
}
@Override
public void destroy() {
// TODO Auto-generated method stub }}

Answer 1

我打开eclipse运行项目时，第一次图片被过滤了，左上角出现个小红叉，图片地址都是正确的，后来在运行时可以。

Answer 2

<url-pattern>/*</url-pattern>  你这里配置了/* 就将所有的文件都过滤了，然后的Filter类里的过滤是将所有文件中取不到userName的都进行了过滤。这样不要说图片，就是你的css js 所有的文件都会被这个过滤器拦截。所以你的<url-pattern>/*</url-pattern> 应该改下，改成<url-pattern>*.jsp</url-pattern> <url-pattern>*.html</url-pattern>....等等于权限有关的文件

Answer 3

<url-pattern>/*</url-pattern>  你这里配置了/* 就将所有的文件都过滤了，然后的Filter类里的过滤是将所有文件中取不到userName的都进行了过滤。这样不要说图片，就是你的css js 所有的文件都会被这个过滤器拦截。所以你的<url-pattern>/*</url-pattern> 应该改下，改成<url-pattern>*.jsp</url-pattern> <url-pattern>*.html</url-pattern>....等等于权限有关的文件，谢谢，亲爱的，记得给分

Answer 4

不明白，你是说把web.xml改成
web.xml
<filter>
<display-name>AuthorizationFilter</display-name>
<filter-name>AuthorizationFilter</filter-name>
<filter-class>org.iflysse.training.filter.AuthorizationFilter</filter-class>
<init-param>
<param-name>excludes</param-name>
<param-value>/LoginServlet,/login.jsp,/SendXiaoXiServlet,/files/sendxiaoxi.jsp</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>AuthorizationFilter</filter-name>
<url-pattern>*.jsp</url-pattern>
</filter-mapping>可是这样就过滤不了字符集乱码了、