Java json 格式化

参考地址

	implementation("com.google.code.gson:gson:2.9.0")
	implementation("org.json:json:20220320")

	implementation("com.fasterxml.jackson.core:jackson-core:2.11.2")
	implementation("com.fasterxml.jackson.core:jackson-databind:2.11.2")

import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonParser;
import org.json.JSONArray;
import org.json.JSONObject;

public class Main {

	public static void main(String[] args) throws Exception{

		// Gson
		Gson gson = new GsonBuilder().setPrettyPrinting().create();
		System.out.println(gson.toJson(JsonParser.parseString("[{"name": "tom1"}, {   "name": "tom2"}]")));
		System.out.println(gson.toJson(JsonParser.parseString("n"
				+ "{n"
				+ "  "name": "tom","age": 12n"
				+ "}")));

		// JSONArray
		System.out.println(new JSONArray("[{"name": "tom1"}, {   "name": "tom2"}]").toString(4));
		System.out.println( new JSONObject("n"
				+ "{n"
				+ "  "name": "tom","age": 12n"
				+ "}").toString(4));

		// jackson
		ObjectMapper mapper = new ObjectMapper();

		System.out.println(mapper.writerWithDefaultPrettyPrinter().writeValueAsString(mapper.readTree("[{"name": "tom1"}, {   "name": "tom2"}]")));

		System.out.println(mapper.writerWithDefaultPrettyPrinter().writeValueAsString(mapper.readTree("n"
				+ "{n"
				+ "  "name": "tom","age": 12n"
				+ "}")));

	}
}

[
  {
    "name": "tom1"
  },
  {
    "name": "tom2"
  }
]
{
  "name": "tom",
  "age": 12
}
[
    {"name": "tom1"},
    {"name": "tom2"}
]
{
    "name": "tom",
    "age": 12
}
[ {
  "name" : "tom1"
}, {
  "name" : "tom2"
} ]
{
  "name" : "tom",
  "age" : 12
}