Spring MVC filter code implementation of login filtering
- 2020-05-27 05:30:02
- OfStack
A very simple login rights interceptor, the specific code is as follows:
The following code is the code that inherits OncePerRequestFilter to implement login filtering:
/**
*
* @author geloin
* @date 2012-4-10 In the afternoon 2:37:38
*/
package com.test.spring.filter;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.filter.OncePerRequestFilter;
/**
* Login to filter
*
* @author geloin
* @date 2012-4-10 In the afternoon 2:37:38
*/
public class SessionFilter extends OncePerRequestFilter {
/*
* (non-Javadoc)
*
* @see
* org.springframework.web.filter.OncePerRequestFilter#doFilterInternal(
* javax.servlet.http.HttpServletRequest,
* javax.servlet.http.HttpServletResponse, javax.servlet.FilterChain)
*/
@Override
protected void doFilterInternal(HttpServletRequest request,
HttpServletResponse response, FilterChain filterChain)
throws ServletException, IOException {
// Do not filter uri
String[] notFilter = new String[] { "login.html", "index.html" };
// The request of uri
String uri = request.getRequestURI();
// uri Contained in the background Filter only when
if (uri.indexOf("background") != -1) {
// Whether the filter
boolean doFilter = true;
for (String s : notFilter) {
if (uri.indexOf(s) != -1) {
// if uri Contains unfiltered uri Is not filtered
doFilter = false;
break;
}
}
if (doFilter) {
// filtering
// from session Gets the logon entity in
Object obj = request.getSession().getAttribute("loginedUser");
if (null == obj) {
// if session If there is no entity of the logon, the pop-up box will prompt you to log in again
// Set up the request and response The character set to prevent scrambled codes
request.setCharacterEncoding("UTF-8");
response.setCharacterEncoding("UTF-8");
PrintWriter out = response.getWriter();
String loginPage = "....";
StringBuilder builder = new StringBuilder();
builder.append("<script type=\"text/javascript\">");
builder.append("alert(' Page expired, please login again! ');");
builder.append("window.top.location.href='");
builder.append(loginPage);
builder.append("';");
builder.append("</script>");
out.print(builder.toString());
} else {
// if session If a logon entity exists in, continue
filterChain.doFilter(request, response);
}
} else {
// If filtering is not performed, continue
filterChain.doFilter(request, response);
}
} else {
// if uri Contains no background , then continue
filterChain.doFilter(request, response);
}
}
}
After writing the filter, it needs to be configured in web.xml:
<filter>
<filter-name>sessionFilter</filter-name>
<filter-class>com.test.spring.filter.SessionFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>sessionFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>