【Filter 页面重定向循环】写一个过滤器造成的页面重定向循环的问题

package com.agen.util; import java.io.IOException; 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;
import javax.servlet.http.HttpSession; import org.springframework.util.Assert;
import org.springframework.util.StringUtils; import com.agen.entity.User; /**
* 首先写一个登录权限过滤类--LoginFilter类实现Filter接口
* @author 申旭栋
*下面这三个方法是必须要实现的
*/
public class LoginFilter implements Filter { @Override
public void init(FilterConfig filterConfig) throws ServletException {
// TODO Auto-generated method stub } @Override
public void doFilter(ServletRequest request, ServletResponse response,FilterChain chain) throws IOException, ServletException {
// 获得在下面代码中要用的request,response,session对象
HttpServletRequest servletRequest = (HttpServletRequest) request;
HttpServletResponse servletResponse = (HttpServletResponse) response;
HttpSession session = servletRequest.getSession(); // 获得用户请求的URI
String path = servletRequest.getRequestURI(); // 从session里取用户的登陆ID
User user = (User) session.getAttribute("user"); // 登陆页面无需过滤
if("/biologyInfo/".equals(path) || "/biologyInfo/login/login1.htmls".equals(path)) {
chain.doFilter(servletRequest, servletResponse);
return;
} // 判断如果没有取到员工信息,就跳转到登陆页面 StringUtils.isEmpty(username)等价于username == null || "".equals(username)
if (user == null) {
// 跳转到登陆页面
servletResponse.sendRedirect("login/login1.htmls");
} else {
// 已经登陆,继续此次请求
chain.doFilter(request, response);
} } @Override
public void destroy() {
// TODO Auto-generated method stub } }

<!-- 配置了springmvc拦截的url为以.hmls结尾的请求 -->
<servlet-mapping>
<servlet-name>rest</servlet-name>
<url-pattern>*.htmls</url-pattern>
</servlet-mapping> <filter-mapping>
<filter-name>openSessionInViewFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

if (user == null) {
// 跳转到登陆页面
servletResponse.sendRedirect("login/login1.htmls");
} else {
// 已经登陆,继续此次请求
chain.doFilter(request, response);
}

if (user == null) {
// 跳转到登陆页面
servletResponse.sendRedirect("/biologyInfo/login/login1.htmls");
} else {
// 已经登陆,继续此次请求
chain.doFilter(request, response);
}

@Controller()
@RequestMapping("login")
public class LoginController {