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"));

}

}