What are the functions of filter drainage devices? Develop a web application,Users with different permissions,There are administrators,There are ordinary users.And administrators may be divided into first-level administrators,Secondary administrator,Level 3 administrator.Each level of administrator may have different management rights operations,Access different resources.In the past, we were all on jsp pages,Control the permissions in the servlet.Through session,See if he has this authority,If so,Let him operate a resource.These are all commonalities.So now we can extract him.Let him do it through a filter;Users access a resource,We filter this request through a filter,Determine whether there is permission to access this resource in the program;Yes,Let him visit,No,Let him go to another page: permission management is realized through the filter;Count the number of visits to web applications,And access the hit rate,Report;Realize the function of data compression;Encrypt the transmitted data;Implement garbled
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What is the precision level of the automatic filter efficiency meter? Air filters have different standards in different countries. China's national standards are divided into three grades: coarse effect, medium effect and high efficiency filter. the European standard is divided into three grades: G.F H. G4 is a European standard air filter.
