如何防止客户端访问JSP页面

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How to prevent client from accessing JSP page

在我的 Web 应用程序中，我使用 JQuery 中的 .load() 函数，在 DIV.

中加载一些 JSP 页面

$("#myDiv").load("chat.jsp");

String sessionId = session.getAttribute("SessionId");

if(sessionId.equals("100")){

 //execute codes

}else{

 //redirect to log in page

}

<body>



  <%



    String userId = session.getAttribute("SessionId").toString();

    if (userId != null) {

      String roomId = request.getParameter("roomId");

      String lastMessageId = request.getParameter("lastMessageId");

      JavaDB myJavaDB = new JavaDB();

      myJavaDB.Connect("Chat","chat","chat");

      Connection conn = myJavaDB.getMyConnection();

      Statement stmt = conn.createStatement();

      String lastId ="";

      int fi = 0;

      ResultSet rset = stmt.executeQuery("select message,message_id,first_name,last_name from users u,messages m where u.user_id=m.user_id and m.message_id>" + lastMessageId +" and room_id=" + roomId +" order by m.message_id asc");

      while (rset.next()) {

        fi = 1;

        lastId = rset.getString(2);

  %>

  

    

      <%=rset.getString(3) +"" + rset.getString(4)%>

    

    

      <%=rset.getString(1)%>

    

  

  <%      }

  %>

  

    <% if (fi == 1) {%>

    <%=lastId%>

    <% } else {%>

    <%=lastMessageId%>

    <% }%>



  <% if (fi == 1) {%>

  

  

  <% }

    } else {

      response.sendRedirect("index.jsp");

    }%>

</body>
.load("chat.jsp", { jquery :"yes" });

String yesOrNo = request.getParameter("jquery");

/chat.jsp?jquery=yes
if (Request.Headers["X-Requested-With"] !="XMLHttpRequest")

{

  Response.Write("AJAX Request only.");

  Response.End();

  return;

}

if(!request.getHeader("X-Requested-With").equals("XMLHttpRequest")){

  out.println("AJAX Request only.");

  out.flush(); 

  out.close(); 

  return; 

}

String ajaxRequest = request.getHeader("X-Requested-With");

if(ajaxRequest == null || !ajaxRequest.equals("XMLHttpRequest")){

  ...

}
$.ajax({

 type:"POST",

 beforeSend: function (request)

 {

  request.setRequestHeader("Authority","AJAXREQUEST");

 },

...........

在 chat.jsp 中，除非此客户端已登录，否则不会执行任何 Java 代码，这意味着，我检查了会话。

$("#myDiv").load("chat.jsp");

String sessionId = session.getAttribute("SessionId");

if(sessionId.equals("100")){

 //execute codes

}else{

 //redirect to log in page

}

<body>



  <%



    String userId = session.getAttribute("SessionId").toString();

    if (userId != null) {

      String roomId = request.getParameter("roomId");

      String lastMessageId = request.getParameter("lastMessageId");

      JavaDB myJavaDB = new JavaDB();

      myJavaDB.Connect("Chat","chat","chat");

      Connection conn = myJavaDB.getMyConnection();

      Statement stmt = conn.createStatement();

      String lastId ="";

      int fi = 0;

      ResultSet rset = stmt.executeQuery("select message,message_id,first_name,last_name from users u,messages m where u.user_id=m.user_id and m.message_id>" + lastMessageId +" and room_id=" + roomId +" order by m.message_id asc");

      while (rset.next()) {

        fi = 1;

        lastId = rset.getString(2);

  %>

  

    

      <%=rset.getString(3) +"" + rset.getString(4)%>

    

    

      <%=rset.getString(1)%>

    

  

  <%      }

  %>

  

    <% if (fi == 1) {%>

    <%=lastId%>

    <% } else {%>

    <%=lastMessageId%>

    <% }%>



  <% if (fi == 1) {%>

  

  

  <% }

    } else {

      response.sendRedirect("index.jsp");

    }%>

</body>
.load("chat.jsp", { jquery :"yes" });

String yesOrNo = request.getParameter("jquery");

/chat.jsp?jquery=yes
if (Request.Headers["X-Requested-With"] !="XMLHttpRequest")

{

  Response.Write("AJAX Request only.");

  Response.End();

  return;

}

if(!request.getHeader("X-Requested-With").equals("XMLHttpRequest")){

  out.println("AJAX Request only.");

  out.flush(); 

  out.close(); 

  return; 

}

String ajaxRequest = request.getHeader("X-Requested-With");

if(ajaxRequest == null || !ajaxRequest.equals("XMLHttpRequest")){

  ...

}
$.ajax({

 type:"POST",

 beforeSend: function (request)

 {

  request.setRequestHeader("Authority","AJAXREQUEST");

 },

...........

那些将被执行的java代码，它们会out.println();一些HTML元素。

我不希望客户端在浏览器中写入 /chat.jsp 来访问此页面，因为它看起来很糟糕，而且主页中的其他内容也不存在，这可能会损害Web 应用程序安全性。

我怎样才能限制某人直接访问 chat.jsp，但又可以通过 .load() 访问它？

更新：

JavaDB 是我创建的一个类，它将我连接到数据库。

这是 chat.jsp

$("#myDiv").load("chat.jsp");

String sessionId = session.getAttribute("SessionId");

if(sessionId.equals("100")){

 //execute codes

}else{

 //redirect to log in page

}

<body>



  <%



    String userId = session.getAttribute("SessionId").toString();

    if (userId != null) {

      String roomId = request.getParameter("roomId");

      String lastMessageId = request.getParameter("lastMessageId");

      JavaDB myJavaDB = new JavaDB();

      myJavaDB.Connect("Chat","chat","chat");

      Connection conn = myJavaDB.getMyConnection();

      Statement stmt = conn.createStatement();

      String lastId ="";

      int fi = 0;

      ResultSet rset = stmt.executeQuery("select message,message_id,first_name,last_name from users u,messages m where u.user_id=m.user_id and m.message_id>" + lastMessageId +" and room_id=" + roomId +" order by m.message_id asc");

      while (rset.next()) {

        fi = 1;

        lastId = rset.getString(2);

  %>

  

    

      <%=rset.getString(3) +"" + rset.getString(4)%>

    

    

      <%=rset.getString(1)%>

    

  

  <%      }

  %>

  

    <% if (fi == 1) {%>

    <%=lastId%>

    <% } else {%>

    <%=lastMessageId%>

    <% }%>



  <% if (fi == 1) {%>

  

  

  <% }

    } else {

      response.sendRedirect("index.jsp");

    }%>

</body>
.load("chat.jsp", { jquery :"yes" });

String yesOrNo = request.getParameter("jquery");

/chat.jsp?jquery=yes
if (Request.Headers["X-Requested-With"] !="XMLHttpRequest")

{

  Response.Write("AJAX Request only.");

  Response.End();

  return;

}

if(!request.getHeader("X-Requested-With").equals("XMLHttpRequest")){

  out.println("AJAX Request only.");

  out.flush(); 

  out.close(); 

  return; 

}

String ajaxRequest = request.getHeader("X-Requested-With");

if(ajaxRequest == null || !ajaxRequest.equals("XMLHttpRequest")){

  ...

}
$.ajax({

 type:"POST",

 beforeSend: function (request)

 {

  request.setRequestHeader("Authority","AJAXREQUEST");

 },

...........

伙计们，我不知道过滤器是什么意思。

更新

如果我决定发送一个参数告诉我此请求来自 Jquery。

$("#myDiv").load("chat.jsp");

String sessionId = session.getAttribute("SessionId");

if(sessionId.equals("100")){

 //execute codes

}else{

 //redirect to log in page

}

<body>



  <%



    String userId = session.getAttribute("SessionId").toString();

    if (userId != null) {

      String roomId = request.getParameter("roomId");

      String lastMessageId = request.getParameter("lastMessageId");

      JavaDB myJavaDB = new JavaDB();

      myJavaDB.Connect("Chat","chat","chat");

      Connection conn = myJavaDB.getMyConnection();

      Statement stmt = conn.createStatement();

      String lastId ="";

      int fi = 0;

      ResultSet rset = stmt.executeQuery("select message,message_id,first_name,last_name from users u,messages m where u.user_id=m.user_id and m.message_id>" + lastMessageId +" and room_id=" + roomId +" order by m.message_id asc");

      while (rset.next()) {

        fi = 1;

        lastId = rset.getString(2);

  %>

  

    

      <%=rset.getString(3) +"" + rset.getString(4)%>

    

    

      <%=rset.getString(1)%>

    

  

  <%      }

  %>

  

    <% if (fi == 1) {%>

    <%=lastId%>

    <% } else {%>

    <%=lastMessageId%>

    <% }%>



  <% if (fi == 1) {%>

  

  

  <% }

    } else {

      response.sendRedirect("index.jsp");

    }%>

</body>
.load("chat.jsp", { jquery :"yes" });

String yesOrNo = request.getParameter("jquery");

/chat.jsp?jquery=yes
if (Request.Headers["X-Requested-With"] !="XMLHttpRequest")

{

  Response.Write("AJAX Request only.");

  Response.End();

  return;

}

if(!request.getHeader("X-Requested-With").equals("XMLHttpRequest")){

  out.println("AJAX Request only.");

  out.flush(); 

  out.close(); 

  return; 

}

String ajaxRequest = request.getHeader("X-Requested-With");

if(ajaxRequest == null || !ajaxRequest.equals("XMLHttpRequest")){

  ...

}
$.ajax({

 type:"POST",

 beforeSend: function (request)

 {

  request.setRequestHeader("Authority","AJAXREQUEST");

 },

...........

然后在chat.jsp中查看

$("#myDiv").load("chat.jsp");

String sessionId = session.getAttribute("SessionId");

if(sessionId.equals("100")){

 //execute codes

}else{

 //redirect to log in page

}

<body>



  <%



    String userId = session.getAttribute("SessionId").toString();

    if (userId != null) {

      String roomId = request.getParameter("roomId");

      String lastMessageId = request.getParameter("lastMessageId");

      JavaDB myJavaDB = new JavaDB();

      myJavaDB.Connect("Chat","chat","chat");

      Connection conn = myJavaDB.getMyConnection();

      Statement stmt = conn.createStatement();

      String lastId ="";

      int fi = 0;

      ResultSet rset = stmt.executeQuery("select message,message_id,first_name,last_name from users u,messages m where u.user_id=m.user_id and m.message_id>" + lastMessageId +" and room_id=" + roomId +" order by m.message_id asc");

      while (rset.next()) {

        fi = 1;

        lastId = rset.getString(2);

  %>

  

    

      <%=rset.getString(3) +"" + rset.getString(4)%>

    

    

      <%=rset.getString(1)%>

    

  

  <%      }

  %>

  

    <% if (fi == 1) {%>

    <%=lastId%>

    <% } else {%>

    <%=lastMessageId%>

    <% }%>



  <% if (fi == 1) {%>

  

  

  <% }

    } else {

      response.sendRedirect("index.jsp");

    }%>

</body>
.load("chat.jsp", { jquery :"yes" });

String yesOrNo = request.getParameter("jquery");

/chat.jsp?jquery=yes
if (Request.Headers["X-Requested-With"] !="XMLHttpRequest")

{

  Response.Write("AJAX Request only.");

  Response.End();

  return;

}

if(!request.getHeader("X-Requested-With").equals("XMLHttpRequest")){

  out.println("AJAX Request only.");

  out.flush(); 

  out.close(); 

  return; 

}

String ajaxRequest = request.getHeader("X-Requested-With");

if(ajaxRequest == null || !ajaxRequest.equals("XMLHttpRequest")){

  ...

}
$.ajax({

 type:"POST",

 beforeSend: function (request)

 {

  request.setRequestHeader("Authority","AJAXREQUEST");

 },

...........

然后他们可以使用这个 URL 简单地破解它。

$("#myDiv").load("chat.jsp");

String sessionId = session.getAttribute("SessionId");

if(sessionId.equals("100")){

 //execute codes

}else{

 //redirect to log in page

}

<body>



  <%



    String userId = session.getAttribute("SessionId").toString();

    if (userId != null) {

      String roomId = request.getParameter("roomId");

      String lastMessageId = request.getParameter("lastMessageId");

      JavaDB myJavaDB = new JavaDB();

      myJavaDB.Connect("Chat","chat","chat");

      Connection conn = myJavaDB.getMyConnection();

      Statement stmt = conn.createStatement();

      String lastId ="";

      int fi = 0;

      ResultSet rset = stmt.executeQuery("select message,message_id,first_name,last_name from users u,messages m where u.user_id=m.user_id and m.message_id>" + lastMessageId +" and room_id=" + roomId +" order by m.message_id asc");

      while (rset.next()) {

        fi = 1;

        lastId = rset.getString(2);

  %>

  

    

      <%=rset.getString(3) +"" + rset.getString(4)%>

    

    

      <%=rset.getString(1)%>

    

  

  <%      }

  %>

  

    <% if (fi == 1) {%>

    <%=lastId%>

    <% } else {%>

    <%=lastMessageId%>

    <% }%>



  <% if (fi == 1) {%>

  

  

  <% }

    } else {

      response.sendRedirect("index.jsp");

    }%>

</body>
.load("chat.jsp", { jquery :"yes" });

String yesOrNo = request.getParameter("jquery");

/chat.jsp?jquery=yes
if (Request.Headers["X-Requested-With"] !="XMLHttpRequest")

{

  Response.Write("AJAX Request only.");

  Response.End();

  return;

}

if(!request.getHeader("X-Requested-With").equals("XMLHttpRequest")){

  out.println("AJAX Request only.");

  out.flush(); 

  out.close(); 

  return; 

}

String ajaxRequest = request.getHeader("X-Requested-With");

if(ajaxRequest == null || !ajaxRequest.equals("XMLHttpRequest")){

  ...

}
$.ajax({

 type:"POST",

 beforeSend: function (request)

 {

  request.setRequestHeader("Authority","AJAXREQUEST");

 },

...........

或类似的东西..

更新

我尝试了 Maksim 的建议，当我尝试访问 chat.jsp 时得到了这个。

关于java：如何防止客户端访问JSP页面

这是想要的效果吗？

为了在我的应用程序中实现这一点，我检查客户端在其请求中发送到我的页面的 http 标头中的 X-Requested-With 字段。如果它的值为 XMLHttpRequest，那么它很可能来自一个 ajax 请求(jQuery 将此标头附加到它的请求中)，否则我不提供该页面。常规(直接)浏览器请求会将此标头字段留空。

在 ASP.Net 中看起来像这样，您必须为 JSP 稍微更改代码：

$("#myDiv").load("chat.jsp");

String sessionId = session.getAttribute("SessionId");

if(sessionId.equals("100")){

 //execute codes

}else{

 //redirect to log in page

}

<body>



  <%



    String userId = session.getAttribute("SessionId").toString();

    if (userId != null) {

      String roomId = request.getParameter("roomId");

      String lastMessageId = request.getParameter("lastMessageId");

      JavaDB myJavaDB = new JavaDB();

      myJavaDB.Connect("Chat","chat","chat");

      Connection conn = myJavaDB.getMyConnection();

      Statement stmt = conn.createStatement();

      String lastId ="";

      int fi = 0;

      ResultSet rset = stmt.executeQuery("select message,message_id,first_name,last_name from users u,messages m where u.user_id=m.user_id and m.message_id>" + lastMessageId +" and room_id=" + roomId +" order by m.message_id asc");

      while (rset.next()) {

        fi = 1;

        lastId = rset.getString(2);

  %>

  

    

      <%=rset.getString(3) +"" + rset.getString(4)%>

    

    

      <%=rset.getString(1)%>

    

  

  <%      }

  %>

  

    <% if (fi == 1) {%>

    <%=lastId%>

    <% } else {%>

    <%=lastMessageId%>

    <% }%>



  <% if (fi == 1) {%>

  

  

  <% }

    } else {

      response.sendRedirect("index.jsp");

    }%>

</body>
.load("chat.jsp", { jquery :"yes" });

String yesOrNo = request.getParameter("jquery");

/chat.jsp?jquery=yes
if (Request.Headers["X-Requested-With"] !="XMLHttpRequest")

{

  Response.Write("AJAX Request only.");

  Response.End();

  return;

}

if(!request.getHeader("X-Requested-With").equals("XMLHttpRequest")){

  out.println("AJAX Request only.");

  out.flush(); 

  out.close(); 

  return; 

}

String ajaxRequest = request.getHeader("X-Requested-With");

if(ajaxRequest == null || !ajaxRequest.equals("XMLHttpRequest")){

  ...

}
$.ajax({

 type:"POST",

 beforeSend: function (request)

 {

  request.setRequestHeader("Authority","AJAXREQUEST");

 },

...........

UPD：快速谷歌搜索后，您的代码可能会是这样的

$("#myDiv").load("chat.jsp");

String sessionId = session.getAttribute("SessionId");

if(sessionId.equals("100")){

 //execute codes

}else{

 //redirect to log in page

}

<body>



  <%



    String userId = session.getAttribute("SessionId").toString();

    if (userId != null) {

      String roomId = request.getParameter("roomId");

      String lastMessageId = request.getParameter("lastMessageId");

      JavaDB myJavaDB = new JavaDB();

      myJavaDB.Connect("Chat","chat","chat");

      Connection conn = myJavaDB.getMyConnection();

      Statement stmt = conn.createStatement();

      String lastId ="";

      int fi = 0;

      ResultSet rset = stmt.executeQuery("select message,message_id,first_name,last_name from users u,messages m where u.user_id=m.user_id and m.message_id>" + lastMessageId +" and room_id=" + roomId +" order by m.message_id asc");

      while (rset.next()) {

        fi = 1;

        lastId = rset.getString(2);

  %>

  

    

      <%=rset.getString(3) +"" + rset.getString(4)%>

    

    

      <%=rset.getString(1)%>

    

  

  <%      }

  %>

  

    <% if (fi == 1) {%>

    <%=lastId%>

    <% } else {%>

    <%=lastMessageId%>

    <% }%>



  <% if (fi == 1) {%>

  

  

  <% }

    } else {

      response.sendRedirect("index.jsp");

    }%>

</body>
.load("chat.jsp", { jquery :"yes" });

String yesOrNo = request.getParameter("jquery");

/chat.jsp?jquery=yes
if (Request.Headers["X-Requested-With"] !="XMLHttpRequest")

{

  Response.Write("AJAX Request only.");

  Response.End();

  return;

}

if(!request.getHeader("X-Requested-With").equals("XMLHttpRequest")){

  out.println("AJAX Request only.");

  out.flush(); 

  out.close(); 

  return; 

}

String ajaxRequest = request.getHeader("X-Requested-With");

if(ajaxRequest == null || !ajaxRequest.equals("XMLHttpRequest")){

  ...

}
$.ajax({

 type:"POST",

 beforeSend: function (request)

 {

  request.setRequestHeader("Authority","AJAXREQUEST");

 },

...........

UPD2：看起来 request.getHeader("X-Requested-With") 在您的情况下返回 null 将条件更改为如下所示：

$("#myDiv").load("chat.jsp");

String sessionId = session.getAttribute("SessionId");

if(sessionId.equals("100")){

 //execute codes

}else{

 //redirect to log in page

}

<body>



  <%



    String userId = session.getAttribute("SessionId").toString();

    if (userId != null) {

      String roomId = request.getParameter("roomId");

      String lastMessageId = request.getParameter("lastMessageId");

      JavaDB myJavaDB = new JavaDB();

      myJavaDB.Connect("Chat","chat","chat");

      Connection conn = myJavaDB.getMyConnection();

      Statement stmt = conn.createStatement();

      String lastId ="";

      int fi = 0;

      ResultSet rset = stmt.executeQuery("select message,message_id,first_name,last_name from users u,messages m where u.user_id=m.user_id and m.message_id>" + lastMessageId +" and room_id=" + roomId +" order by m.message_id asc");

      while (rset.next()) {

        fi = 1;

        lastId = rset.getString(2);

  %>

  

    

      <%=rset.getString(3) +"" + rset.getString(4)%>

    

    

      <%=rset.getString(1)%>

    

  

  <%      }

  %>

  

    <% if (fi == 1) {%>

    <%=lastId%>

    <% } else {%>

    <%=lastMessageId%>

    <% }%>



  <% if (fi == 1) {%>

  

  

  <% }

    } else {

      response.sendRedirect("index.jsp");

    }%>

</body>
.load("chat.jsp", { jquery :"yes" });

String yesOrNo = request.getParameter("jquery");

/chat.jsp?jquery=yes
if (Request.Headers["X-Requested-With"] !="XMLHttpRequest")

{

  Response.Write("AJAX Request only.");

  Response.End();

  return;

}

if(!request.getHeader("X-Requested-With").equals("XMLHttpRequest")){

  out.println("AJAX Request only.");

  out.flush(); 

  out.close(); 

  return; 

}

String ajaxRequest = request.getHeader("X-Requested-With");

if(ajaxRequest == null || !ajaxRequest.equals("XMLHttpRequest")){

  ...

}
$.ajax({

 type:"POST",

 beforeSend: function (request)

 {

  request.setRequestHeader("Authority","AJAXREQUEST");

 },

...........

根据 http://www.c-sharpcorner.com/blogs/2918/how-to-set-a-request-header-in-a-jquery-ajax-call.aspx

JQuery gives you the tools you need to create a request and retrieve a response through it's ajax library. The raw $.ajax call gives you all kinds of callbacks to manipulate http messages.

因此，您可以像这样在 Ajaxa 调用中添加自定义请求标头

$("#myDiv").load("chat.jsp");

String sessionId = session.getAttribute("SessionId");

if(sessionId.equals("100")){

 //execute codes

}else{

 //redirect to log in page

}

<body>



  <%



    String userId = session.getAttribute("SessionId").toString();

    if (userId != null) {

      String roomId = request.getParameter("roomId");

      String lastMessageId = request.getParameter("lastMessageId");

      JavaDB myJavaDB = new JavaDB();

      myJavaDB.Connect("Chat","chat","chat");

      Connection conn = myJavaDB.getMyConnection();

      Statement stmt = conn.createStatement();

      String lastId ="";

      int fi = 0;

      ResultSet rset = stmt.executeQuery("select message,message_id,first_name,last_name from users u,messages m where u.user_id=m.user_id and m.message_id>" + lastMessageId +" and room_id=" + roomId +" order by m.message_id asc");

      while (rset.next()) {

        fi = 1;

        lastId = rset.getString(2);

  %>

  

    

      <%=rset.getString(3) +"" + rset.getString(4)%>

    

    

      <%=rset.getString(1)%>

    

  

  <%      }

  %>

  

    <% if (fi == 1) {%>

    <%=lastId%>

    <% } else {%>

    <%=lastMessageId%>

    <% }%>



  <% if (fi == 1) {%>

  

  

  <% }

    } else {

      response.sendRedirect("index.jsp");

    }%>

</body>
.load("chat.jsp", { jquery :"yes" });

String yesOrNo = request.getParameter("jquery");

/chat.jsp?jquery=yes
if (Request.Headers["X-Requested-With"] !="XMLHttpRequest")

{

  Response.Write("AJAX Request only.");

  Response.End();

  return;

}

if(!request.getHeader("X-Requested-With").equals("XMLHttpRequest")){

  out.println("AJAX Request only.");

  out.flush(); 

  out.close(); 

  return; 

}

String ajaxRequest = request.getHeader("X-Requested-With");

if(ajaxRequest == null || !ajaxRequest.equals("XMLHttpRequest")){

  ...

}
$.ajax({

 type:"POST",

 beforeSend: function (request)

 {

  request.setRequestHeader("Authority","AJAXREQUEST");

 },

...........

然后在您的 servlet 中检查请求是否具有标头授权等于 AJAXREQUEST。这就是您阅读请求标头的方式 http://www.apl.jhu.edu/~hall/java/Servlet-Tutorial/Servlet-Tutorial-Request-Headers.html

你应该使用过滤器。检查过滤器代码中的会话并重定向到登录。

您的代码片段是 servlet 吗？如果是这样，请使用安全框架(例如 Spring Security)或 javax.servlet.Filter 来应用安全性，那么您也可以将安全性应用到 JSP。

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