Introduction to filters and introduction to solvent Filters

Introduction to filters and introduction to solvent Filters

This is the first time after listening to strong brother, I will immediately write down the points that can be remembered to deepen my memory. Then, I will continue to add the following original documents after viewing the documents.

The filter is processed after the page is sent to the server and filtered by the server.

• Multiple filters can be processed together to form a filter chain.
• You can set multiple processing methods (request, forword, include). If the forward parameter is set on the page, the request cannot be processed.
• You can set the file to be filtered to be a file of a certain type, or a file in a folder or a type of file in a folder.

The following is a supplement:

 

1. You can set which pages or Servlets use filters.

1. All resources in the application /*
2. File resources of the specified type *. html
3. All files in the specified directory/folder_name /*
4. The specified servlet myfilter. LoggerServlet
6./simplefilter.html
7. specify a single file of the specified type in the directory/dir_name/index. jsp

Note whether the slash "/" exists.

2. You can set the request method to use the filter. The request methods include (request, forward, include, exception)

Request

Href = "a. jsp"

Response. sendRedirect ("a. jsp ");

Window. open ("a. jsp ");

Location. href = "a. jsp ";

Src = "a. jsp"

.........

Forward page Jump

<Jsp: forward ....

SendForward...

Include

There are two methods to include other pages. One is the command label <% @ include file = "xxx. jsp "%>, one is the action tag <jsp: include page =" xxx. jsp "/>

Execetion

......

Iii. Cases
1. Set the encoding to prevent garbled characters
2. access permission Control

Iv. application scenarios

Character encoding conversion, permission management, access logging, and sensitive word Filtering