采用递归的方式,遍历JSON中所有的KEY。
JSON格式如下:{"username":"tom","age":18,"address":[{"province":"上海市"},{"city":"上海市"},{"disrtict":"静安区"}]}
处理后,得到的结果如下:address|province|city|disrtict|username|age
import com.alibaba.fastjson.JSONObject;
import com.alibaba.fastjson.JSONArray;
public class fastJsonDiff {
/**
* 递归读取所有的key
*
* @param jsonObject
*/
public static StringBuffer getAllKey(JSONObject jsonObject) {
StringBuffer stringBuffer = new StringBuffer();
Iterator<String> keys = jsonObject.keySet().iterator();// jsonObject.keys();
while (keys.hasNext()) {
String key = keys.next();
stringBuffer.append(key.toString()).append("|");
if (jsonObject.get(key) instanceof JSONObject) {
JSONObject innerObject = (JSONObject) jsonObject.get(key);
stringBuffer.append(getAllKey(innerObject));
} else if (jsonObject.get(key) instanceof JSONArray) {
JSONArray innerObject = (JSONArray) jsonObject.get(key);
stringBuffer.append(getAllKey(innerObject));
}
}
return stringBuffer;
}
public static StringBuffer getAllKey(JSONArray json1) {
StringBuffer stringBuffer = new StringBuffer();
if (json1 != null ) {
Iterator i1 = json1.iterator();
while (i1.hasNext()) {
Object key = i1.next();
if (key instanceof JSONObject) {
JSONObject innerObject = (JSONObject) key;
stringBuffer.append(getAllKey(innerObject));
} else if (key instanceof JSONArray) {
JSONArray innerObject = (JSONArray) key;
stringBuffer.append(getAllKey(innerObject));
}else{
}
}
}
return stringBuffer;
}
private final static String st1 = "{\"username\":\"tom\",\"age\":18,\"address\":[{\"province\":\"上海市\"},{\"city\":\"上海市\"},{\"disrtict\":\"静安区\"}]}";
private final static String st2 = "{username:\"tom\",age:18}";
public static void main(String[] args) {
System.out.println(st1);
JSONObject jsonObject1 = JSONObject.parseObject(st1);
StringBuffer stb = getAllKey(jsonObject1);
System.err.println(stb);
}
}