JAVA 取Json字符串 里面值

import net.sf.json.JSONObject;

public class TJsonTest {

	/**
	 * @param args
	 */
	public static void main(String[] args)  throws Exception {
		
		String  requestStr="{\"access_token\":\"MoSu_b2aV8-iYau52meGQEZfYVfrOH5ejeEyRRzUu2YHKw94RKK3QeCLcZGXTTqJ\",\"expires_in\":7200}";
		
		JSONObject jsonObject =  JSONObject.fromObject(requestStr); 
		System.out.println(jsonObject.getString("access_token"));
		

	}

}