How to parse JSON in Java

I have the following JSON text. How can I parse it to get the values of pageName, pagePic, post_id, etc.?

    {
       "pageInfo": {
             "pageName": "abc",
             "pagePic": "http://example.com/content.jpg"
        },
        "posts": [
             {
                  "post_id": "123456789012_123456789012",
                  "actor_id": "1234567890",
                  "picOfPersonWhoPosted": "http://example.com/photo.jpg",
                  "nameOfPersonWhoPosted": "Jane Doe",
                  "message": "Sounds cool. Can't wait to see it!",
                  "likesCount": "2",
                  "comments": [],
                  "timeOfPost": "1234567890"
             }
        ]
    }