Java web Filter filter

Filter: Filter

When the resource access server, the filter may be intercepted request, complete some special features

As a filter:

• General Procedure for completion by
  • Login authentication
  • Agree encoding process
  • Sensitive character filtering

step

• Defined class that implements the interface Filter
• Replication method
• Configuration intercept path
  • web.xml
  • annotation

Life cycle

• After the server starts, create Filter object and then call the init method
• DoFilter method performed upon request intercepting
• After the server is shut down, Filter object is destroyed

Detailed Filter Configuration

• Interception path configuration:
  • Specific resource path: /index.jsp
  • Interception directory: / user / *
  • Extension intercepts: * jsp.
  • Block all resources: / *
• Intercept mode configuration:
  • Notes Configuration
    • Set dispatcherTypes property
      • REQUEST: default browser requests a resource
      • FORWARD: Forwarding access to resources
      • INCLUDE: includes access to resources
      • ERROR: error Jump Resources
      • ASYNC: asynchronous access resources
  • web.xml Configuration
    • Settings <dispatcher> <dispatcher> to
• Filter chain
  • After performing the first return
  • Filter order
    • Notes Configuration
      • Compare string comparison rules in accordance with the class name, the smaller first execution