java 字符串转成 json 数组并且遍历

首先要导入 net.sf.json.JSONArray和net.sf.json.JSONObject 两个jar 包

String str = "[{name:'name1',value:'value1'},{name:'name2',value:'value2'},{name:'name3',value:'value3'}]" ;  // 一个未转化的字符串
 
JSONArray json = JSONArray.fromObject(str ); // 首先把字符串转成 JSONArray  对象
 
if(json.size()>0){
  for(int i=0;i<json.size();i++){
    JSONObject job = json.getJSONObject(i);  // 遍历 jsonarray 数组，把每一个对象转成 json 对象
    System.out.println(job.get("name")+"=") ;  // 得到 每个对象中的属性值
  }
}

public static void test() {
    JSONObject jsonAlarmMsg = null;
    //{"code":"1","data":[{"file_name":"51信用卡","file_value":[{"index_value":4472,"index_name":"笔数"},{"index_value":9923,"index_name":"金额"}]},{"file_name":"量化派","file_value":[{"index_value":8303,"index_name":"笔数"},{"index_value":9659,"index_name":"金额"}]},{"file_name":"携程","file_value":[{"index_value":1504,"index_name":"笔数"},{"index_value":5067,"index_name":"金额"}]}],"title_type":"当日各渠道笔数-金额"}
    String code = jsonAlarmMsg.getString("code");
    //如果 code等于1 数据正常
    if ("1".equals(code)) {
        String title_type = jsonAlarmMsg.getString("title_type");
        System.out.println(title_type);
        //"data":[{"file_name":"51信用卡","file_value":[{"index_value":4472,"index_name":"笔数"},{"index_value":9923,"index_name":"金额"}]},{"file_name":"量化派","file_value":[{"index_value":8303,"index_name":"笔数"},{"index_value":9659,"index_name":"金额"}]},{"file_name":"携程","file_value":[{"index_value":1504,"index_name":"笔数"},{"index_value":5067,"index_name":"金额"}]}]
        String data = jsonAlarmMsg.getString("data");
        //解析data
        JSONArray jsonArray = JSONArray.fromObject(data); // 首先把字符串转成 JSONArray  对象
        //如果里面有数据
        if (jsonArray.size() > 0) {
            for (int i = 0; i < jsonArray.size(); i++) {
                net.sf.json.JSONObject jsonObject = jsonArray.getJSONObject(i);
                //{"file_name":"51信用卡","file_value":[{"index_value":4472,"index_name":"笔数"},{"index_value":9923,"index_name":"金额"}]}
                System.out.println(jsonObject.get("file_name"));
                System.out.println(jsonObject.get("file_value"));
            }
        } else {
            System.out.println("转换JSON，jsonArray.size()无数据");
        }
    } else {
        System.out.println("code编码等于1，数据有误");
    }
}