


Detailed explanation of interception examples of interceptors on ajax requests
Solve the interception of ajax requests by the interceptor
Interceptor configuration:
public boolean preHandle(HttpServletRequest request, HttpServletResponse response,Object obj) throws Exception { //获取判定登陆的session是否存在 String token = (String) request.getSession().getAttribute("token"); String postId = (String) request.getSession().getAttribute("postId"); if(token == null || token == ""){ String XRequested =request.getHeader("X-Requested-With"); if("XMLHttpRequest".equals(XRequested)){ response.getWriter().write("IsAjax"); }else{ response.sendRedirect("/m-web/user/toLogin"); } return false; } if(postId == null || postId == ""){ String XRequested =request.getHeader("X-Requested-With"); if("XMLHttpRequest".equals(XRequested)){ response.getWriter().write("IsAjax"); }else{ response.sendRedirect("/m-web/user/toLogin"); } return false; } return true; }
1. Determine String XRequested =request.getHeader("X-Requested-With") The value is to determine whether it is an ajax request.
2. response.getWriter().write("IsAjax"); Write a response data to ajax, so that you can make a judgment in ajax.
There are two ways to judge. Method:
1) Make judgment directly in ajax (not recommended)
success:function(data){ if(data == "IsAjax"){ window.location.href="m-web/user/toLogin" return; } }
2) Change the ajax source code and then perform compression, which is modified in a global way (recommended)
if ( isSuccess ) {// if no content if ( status === 204 || s.type === "HEAD" ) { statusText = "nocontent"; // if not modified } else if ( status === 304 ) { statusText = "notmodified"; // If we have data, let's convert it } else { statusText = response.state; success = response.data; error = response.error; isSuccess = !error; //解决ajax拦截问题 var result = responses.text; if(result.indexOf("IsAjax")>=0){ window.location.href="m-web/user/toLogin"; return; } } }
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For more detailed examples of interception of ajax requests by interceptors, please pay attention to the PHP Chinese website for related articles!
Related articles:
Interception of global ajax request instance analysis through JS
Use Mock.js to intercept AJAX in Node.js server environment Requested tutorial

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