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问题描述
我正在使用JAASRealm身份验证(在tomcat 7中)创建一个Web.这是servlet的过滤器:
I'm doing a web with JAASRealm authentication (in tomcat 7).This is a filter for the servlets:
private String loginPage = "welcome.jsp";
@Override
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain filterChain) throws IOException, ServletException {
if ((request instanceof HttpServletRequest) && (response instanceof HttpServletResponse)) {
HttpServletRequest httpServletRequest = (HttpServletRequest) request;
HttpServletResponse httpServletResponse = (HttpServletResponse) response;
if (httpServletRequest.getUserPrincipal() == null) {
// User is not logged in, redirect to login page.
httpServletRequest.setAttribute("from", httpServletRequest.getRequestURI());
httpServletResponse.sendRedirect(loginPage);
}
else {
filterChain.doFilter(request, response);
}
}
}
我已经在web.xml中声明了它
And I have declared it in web.xml
<filter>
<filter-name>login-filter</filter-name>
<filter-class>LoginFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>login-filter</filter-name>
<url-pattern>/sampleServlet</url-pattern>
</filter-mapping>
我的问题是,当我未通过身份验证并且我通过AJAX调用servlet时,这一行过滤器不起作用
My problem is when I'm not authenticated and I call the servlet via AJAX, this line of filter doesn't work
httpServletResponse.sendRedirect(loginPage);
因此,我没有收到任何数据,也没有重定向到登录页面.在这种情况下我该怎么办?
So, I haven't receive any data and I'm not redirected to the loggin page. What can I do in this case?
推荐答案
这是我在过滤AJAX请求时发送重定向的方式...
Here is how I send re-directs when Filtering AJAX requests...
AJAX代码(jQuery)
AJAX Code (jQuery)
$.ajax({
type: 'post',
url: '/signMeInServlet',
data: {
'name': name,
'pass': passW,
},
dataType: 'json',
success: processSignInReturnMethod,
error: function (xhr, ajaxOptions, thrownError){
if (thrownError.redirect.length) {
window.location.replace(thrownError.redirect);
} else {
alert('There was an error processing your request, please try again');
}
}
});
相关过滤器代码
// Rest of your Filter processing and logic here, once you know you want
// to redirect, use the below code, which works for both AJAX and regualar
// requests
HttpServletRequest hreq = (HttpServletRequest) request;
String redirectUrl = "/redirected.jsp";
if (hreq.getHeader("x-requested-with") != null &&
hreq.getHeader("x-requested-with").equalsIgnoreCase("XMLHttpRequest")) {
// Set up your response here
HttpServletResponse hres = (HttpServletResponse) response;
hres.setContentType("text/json; charset=UTF-8");
PrintWriter out = hres.getWriter();
String json = "[{\"redirect\":\"" + redirectUrl + "\"}]";
out.write(json);
out.flush();
out.close();
} else {
((HttpServletResponse)response).sendRedirect(redirectUrl);
}
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