Summary of jump between JSP and Servlet

Request. getcontextpath () indicates/project name. Example:/news01

 

1. jump from the JSP page to another page or Servlet

 

Use the full path (/project name/file path) to jump from the JSP page to other pages ). For example, the project name is news01, and the page Directory is as follows:

 

1) For example, jump from the index. jsp page to the list. jsp page under the main Folder:

 

Link path:/news01/main/list. jsp

 

2) For example, jump from the index. jsp page to your own page:

 

Link path:/news01/index. jsp

 

3) For example, jump from the list. jsp page to the index. jsp page:

 

Link path:/news01/index. jsp

 

4) for example, jump from the list. jsp page to the insert. jsp page.

 

Link path:/news/main/insert. jsp

 

5) The servlet URL is/servlet/testservlet.

 

The link to the servlet jump from any JSP page is/news01/servlet/testservlet

 

6) The servlet URL is/testservlet.

 

The link to the servlet jump from any JSP page is/news01/testservlet

 

7) Example of the Form Action path:

<Form action = "/news01/servlet/loginservlet" method = "Post">

 

Ii. jump from servlet to JSP page

 

(1) Use the requestdispatcher method:

 

1. Single Layer: The servlet URL is in the root directory (it does not need to start with a slash)

 

(1) From testservlet (urlpattern:/testservlet) to index. jsp under the root directory

 

The jump statement is:

 

Request. gerrequestdispatcher ("index. jsp"). Forward (request, response );

 

(2) From testservlet (urlpattern:/testservlet) to list. jsp under the main directory

 

The jump statement is:

 

Request. gerrequestdispatcher ("Main/list. jsp"). Forward (request, response );

 

2. Double or multi-layer: the servlet URL is under the root directory (start with a slash, and the slash here represents the current application-this project represents/news01/

 

(1) From testservlet (urlpattern:/servlet/testservlet) to index. jsp under the root directory

 

The jump statement is:

 

Method 1: Relative Path

 

Request. gerrequestdispatcher ("../index. jsp"). Forward (request, response );

 

Method 2: Start with a slash

 

Request. gerrequestdispatcher ("/index. jsp"). Forward (request, response );

(3) from testservlet (urlpattern:/servlet/testservlet) to list. jsp in the main directory

 

The jump statement is:

 

Method 1: Relative Path

 

Request. gerrequestdispatcher ("../main/list. jsp"). Forward (request, response );

 

Method 2: Start with a slash

 

Request. gerrequestdispatcher ("/main/list. jsp"). Forward (request, response );

 

(2) Use response. sendredirect ()

 

Whether the servlet is a single layer or a double layer, use the following method:

 

Response. sendredirect ("/news01/index. jsp ");

 

Response. sendredirect ("/news01/main/list. jsp ");

 

Request. getcontextpath () indicates the/project name. Example:/news01

 

Response. sendredirect (request. getcontextpath () + "/main/list. jsp ");

 

Response. sendredirect (request. getcontextpath () + "/index. jsp ");