Java将json中key值下划线转为驼峰格式
import java.util.Set;
public class JsonUtil {
public static void convert(Object obj) {
if (obj instanceof JSONArray) {
JSONArray jsonArray = (JSONArray) obj;
for (Object json : jsonArray) {
convert(json);
}
} else if (obj instanceof JSONObject) {
JSONObject json = (JSONObject) obj;
Set<String> keySet = json.keySet();
String[] keyArray = keySet.toArray(new String[keySet.size()]);
for (String key : keyArray) {
Object value = json.get(key);
String[] keyStrs = key.split("_");
if (keyStrs.length > 1) {
StringBuilder sb = new StringBuilder();
for (int i = 0; i < keyStrs.length; i++) {
String keyStr = keyStrs[i];
if (!keyStr.isEmpty()) {
if (i == 0) {
sb.append(keyStr);
} else {
int c = keyStr.charAt(0);
if (c >= 97 && c <= 122) {
int v = c - 32;
sb.append((char) v);
if (keyStr.length() > 1) {
sb.append(keyStr.substring(1));
}
} else {
sb.append(keyStr);
}
}
}
}
json.remove(key);
json.put(sb.toString(), value);
}
convert(value);
}
}
}
/**
* 将json字符串中的key名称中包含下划线的字段，转成驼峰命名格式
*
* @param str String格式的JSON串
* @return 转换后的对象（可能是JSONObject或JSONArray）
*/
public static Object convertUnderlineToCamelCase(String str) {
Object obj = JSON.parse(str);
convert(obj);
return obj;
}
public static void main(String[] args) {
String json = "{\n" +
" \"test\": [\n" +
" {\n" +
" \"self_auth\": {\n" +
" \"a_id\": \"123\",\n" +
" \"b_num\": 7,\n" +
" \"user_name\": \"oldlu\"\n" +
" }\n" +
" }\n" +
" ]\n" +
"}";
System.out.println(convertUnderlineToCamelCase(json));
}
}