在java中concat两个json对象
我想连接多个json对象。
我有两个像这样的json
{"message":"test","status":"0"}
和这个
{"message":"test-2","status":"1"}
结果必须是
[{"message":"test","status":"0"},{"message":"test-2","status":"1"}]
我怎么能用Java做到这一点?
做这样的事情:
List array = new ArrayList (); array.add("{\"message\":\"test\",\"status\":\"0\"}"); array.add("{\"message\":\"test-2\",\"status\":\"1\"}"); array.toString();
如果您想在Java中使用对JSON对象的支持,请考虑使用Gson:
import com.google.gson.JsonArray; import com.google.gson.JsonObject; import com.google.gson.JsonParser; public class Main { public static void main(String[] args) { JsonObject json1 = (JsonObject) new JsonParser().parse("{\"message\":\"test\",\"status\":\"0\"}"); JsonObject json2 = (JsonObject) new JsonParser().parse("{\"message\":\"test-2\",\"status\":\"1\"}"); JsonArray array = new JsonArray(); array.add(json1); array.add(json2); System.out.println(array.toString()); } }
这次会给你你想要的对象。
您可以轻松地使用JSONObject.toString()
并轻松地连接字符串,例如
String x = "[" + obj1.toString() "," + obj2.toString() + "]";
要么
StringBuilder newStr = new StringBuilder() ; newStr.append("[").append(obj1.toString()).append(",").append(obj2.toString());
private static void concatJSON() throws IOException, InterruptedException { JSONParser parser = new JSONParser(); Object obj = parser.parse(new FileReader(new File(Main.class.getResource("/file/user.json").toURI()))); JSONObject jsonObj = (JSONObject) obj; //usernameJsonObj String [] values = {"0.9" , Date.from(Calendar.getInstance().toInstant()).toLocaleString()}, innermost = {"Accomplished", "LatestDate"}, inner = {"Lesson1", "Lesson2", "Lesson3", "Lesson4"}; String in = "Jayvee Villa"; JSONObject jo1 = new JSONObject(); for (int i = 0; i < innermost.length; i++) jo1.put(innermost[i], values[i]); JSONObject jo2 = new JSONObject(); for (int i = 0; i < inner.length; i++) jo2.put(inner[i], jo1); JSONObject jo3 = new JSONObject(); jo3.put(in, jo2); String merger = jsonObj.toString().substring(0, jsonObj.toString().length()-1) + "," +jo3.toString().substring(1); System.out.println(merger); FileWriter pr = new FileWriter(file); pr.write(merger); pr.flush(); pr.close(); }