The JQL can search in the 'issue' page , just like this video JQL.
But, I want to use JQL in my java file,
maybe i can call some method and give the JQL command as parameter ,
and then it will return ans to me.
Is there any API to do it?
Could you please give me sample code?
Have a look at https://developer.atlassian.com/display/JIRADEV/Plugin+Tutorial+-+JIRA+Issue+CRUD+and+Search - that explains how to use JQL in a plugin. Once you've got the basics in there, it's quite easy to extend, or reuse in other plugins.
As a general principle, you can't. I could give you the SQL for that particular query, but JQL is NOT SQL and there is no simple way to translate them
To translate that directly, you'll need to read Jiraissue, project, customfield, customfieldvalue and whatever user database you are using (cwd_user if you're using internal user lists or LDAP etc)
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