java JSONObject对象和Map对象相互转换
1.由json字符串转换成Map对象
如json字符串：{"contend":[{"bid":"22","carid":"0"},{"bid":"22","carid":"0"}],"result":100,"total":2}
下面直接附代码：
//json字符串String jsondata="{"contend":[{"bid":"22","carid":"0"},{"bid":"22","carid":"0"}],"result":100,"total":2}";
JSONObject obj= JSON.parseObject(jsondata);
//map对象
Map<String, Object> data =new HashMap<>();
//循环转换
Iterator it =obj.entrySet().iterator();
while (it.hasNext()) {
Map.Entry<String, Object> entry = (Entry<String, Object>) it.next();
data.put(entry.getKey(), entry.getValue());
}
System.out.println("map对象:"+data.toString());
下面是输出内容：
{total=2, contend=[{"carid":"0","bid":"22"},{"carid":"0","bid":"22"}], result=100}
2.由Map对象转换成json字符串
//map对象Map<String, Object> data =new HashMap<>();
String x =JSONObject.toJSONString(data);
System.out.println("json字符串:"+x);
下面是输出内容：
{"total":2,"result":100,"contend":[{"carid":"0","bid":"22"},{"carid":"0","bid":"22"}]}
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