Summary of JSP page jump methods

There are several ways to implement JSP page jump:

n                                                                                                                                                                                                                                                                       Form (Client Jump) ## N uses the Response object (client jump) ## n n to use the Forward action mark (server side jump) ## n n uses the RequestDispatcher class (server -side jump)



1. Use the response object

(1) Call the sendRedirect() method to redirect.

Note the following two points:

Ø       sendRedirect() can be passed with parameters

For example:

sendRedirect(“/main.jsp?userName=zhangsan”

Ø         sendRedirect() After that, it should be followed by the sentence return

sendRedirect() is redirected through the browser, so there will be no actual action until the page processing is completed. Now that you have already done the steering, what is the significance of the subsequent output? And it is possible that the steering fails due to the subsequent output.

(2) Call the setHeader() method, wait a few seconds, and automatically redirect to another page.

You can call the setHeader("Refresh", "Time; Target Page") method through the response object to automatically redirect to another page after waiting for a few seconds.

response.setHeader("Refresh", "10; url=login.jsp");

The above code means that after waiting for 10 seconds, it will automatically redirect to the login.jsp page.

2. Use forward action tag

The difference between response redirection and forward jump

(1) response redirection

n Execution Complete all the code on the page and then jump to the target page.

n       After jumping to the target page, the URL in the browser address bar will change.

n        Redirect on the browser side.

n You can jump to pages on other servers,

For example: response.sendRedirect("http://www.baidu.com")

(2) forward jump

n Jump directly to the target page, and the subsequent code will no longer be executed.

n        After jumping to the target page, the URL in the browser address bar will not change.

n         Redirect on the server side.

n                                                                                                    Cannot jump to pages on other servers.

3. Use the RequestDispatcher class

Basic usage:

RequestDispatcher rd = request.getRequestDispatcher("目标页面");
rd.forward(request,response);

Use RequestDispatcher to implement page jumps, and use forward action tags to implement pages Jump, the basic principle is the same.

Response redirect the difference between the jumping of RequestDispatcher

(1) Response to redo all the code of the page to the complete page, and then jump to the target page.

n       After jumping to the target page, the URL in the browser address bar will change.

n        Redirect on the browser side.

n You can jump to pages on other servers,

For example: response.sendRedirect("http://www.baidu.com")

(2) RequestDispatcher jump

n​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​

n        After jumping to the target page, the URL in the browser address bar will not change.
n         Redirect on the server side.

n                               cannot jump to pages on other servers.

The difference between forward jump and RequestDispatcher jump

(1) forward jump

n             The code after the forward action mark will no longer be executed and will jump to the target page immediately.
n        When specifying the target page, you can use either an absolute path or a relative path.

(2) RequestDispatcher jump

n  After executing all codes, including all codes after RequestDispatcher, jump to the target page.
n        When specifying the target page, only absolute paths can be used.

The above is a summary of the JSP page jump method introduced by the editor. I hope it will be helpful to you. If you have any questions, please leave me a message and the editor will reply to you in time!

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