Is it disappointed with, in, or by? please give me some examples as much as possible about them

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"Disappointed by" usually indicates that somebody/something has done something specific to cause you to be disappointed:

"I was disappointed by the waitress. She said she'd give me a sample, but she never did!"

"Disappointed in" usually indicates a deeper level of disappointment with the nature of somebody or something, or repeated problems with them, and often indicates that the speaker has lost faith in someone's ability to do what's expected of them:

"I'm very disappointed in Bill. I thought he had experience with this job, but every time he does it he does something wrong."
or
"I'm disappointed in the government. They just can't seem to get anything done!"

"Disappointed with" implies that the cause of the disappointment was a general disappointment about their qualifications/abilities/etc, NOT being disappointed by any SPECIFIC thing that they've done.

"I'm disappointed with Bob lately."