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JSON 파일
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{
"company": "tistory",
"address": "seoul",
"number": "0212345678",
"newEmployees": [
{
"name": "kim",
"age": "29",
"isNew": true
},
{
"name": "park",
"age": "27",
"isNew": true
},
{
"name": "lee",
"age": "26",
"isNew": true
}
]
}
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cs |
1. Gson jar 파일 lib 추가
- gson-2.3.1.jar
2. json 파일 읽기
- JsonElement element = jsonParser.parse(new FileReader("C:\\Users\\USER\\Desktop\\java-workspaces\\JavaTest\\jsontestfile\\gson.json"));
3. Object 만들기
- jsonobject = element.getAsJsonObject();
4. jsonarray 넣기
- JsonArray memberArray = (JsonArray) jsonobject.get("newEmployees");
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package json;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
public class JsonReadTest {
public static void main(String[] args) {
FileWriter writer=null;
try {
JsonObject jsonobject = new JsonObject();
JsonParser jsonParser = new JsonParser();
JsonElement element = jsonParser.parse(new FileReader("C:\\Users\\USER\\Desktop\\java-workspaces\\JavaTest\\jsontestfile\\gson.txt"));
jsonobject = element.getAsJsonObject();
JsonArray memberArray = (JsonArray) jsonobject.get("newEmployees");
JsonObject object = (JsonObject) memberArray.get(1);
System.out.println(Integer.parseInt(object.get("age").toString().replace("\"", "")));
String aaa = object.get("age").toString();
System.out.println(aaa);
object.addProperty("park", "bang");
System.out.println(object.get("name"));
System.out.println(memberArray);
Gson gson = new GsonBuilder().setPrettyPrinting().create();
String json = gson.toJson(element);
try {
writer = new FileWriter("C:\\Users\\USER\\Desktop\\java-workspaces\\JSONTest\\jsontestfile\\new_gson.json");
writer.write(json);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally {
try {
writer.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
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cs |
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