怎样用java解析一个json字符串

{“data”:{"a":[{"b1":"bb1","c1":"cc1"},{"b2":"bb2","c2":"cc2"}]}}

怎样在后台提取出 bb1 cc1 bb2 cc2？

public static void main(String[] args){

String temp="{'data':{'a':[{'b1':'bb1','c1':'cc1'},{'b2':'bb2','c2':'cc2'}]}}";

JSONObject jodata =JSONObject.fromObject(temp);

JSONObject joa =JSONObject.fromObject(jodata.get("data").toString());

JSONArray ja=JSONArray.fromObject(joa.get("a"));

for(int i=0;i<ja.size();i++){

JSONObject o=ja.getJSONObject(i);

if(o.get("b1")!=null){

System.out.println(o.get("b1"));

}

if(o.get("c1")!=null){

System.out.println(o.get("c1"));

}

if(o.get("b2")!=null){

System.out.println(o.get("b2"));

}

if(o.get("c2")!=null){

System.out.println(o.get("c2"));

}

}

}

注：要包含两个jar包ezmorph-1.0.6.jar和json-lib-2.2.2-jdk15.jar，jar包在附件中