解決攔截器對ajax請求的攔截
攔截器配置:
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、判斷 String XRequested =request.getHeader("X-Requested-With") 的值,目的是判斷是否為ajax請求。
2、response.getWriter().write("IsAjax");寫出一個回應的資料給ajax,這樣就可以在ajax裡面做判斷
判斷的方式存在兩種方式:
〟1)直接在ajax裡面做判斷(不建議)
success:function(data){ if(data == "IsAjax"){ window.location.href="m-web/user/toLogin" return; } }
2)改ajax源碼然後在做壓縮,是針對全局的方式來修改的(建議)
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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