JsonNode 和 json 互转

JsonNode 和 json 互转

import java.io.IOException;
import java.util.Iterator;
import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;

public class JacksonTest {

	public static void main(String[] args) throws JsonParseException, JsonMappingException, IOException {
		String json = "{"username":"zhangsan","性别":"男","company":{"companyName":"中华","address":"北京"},"cars":["奔驰","宝马"]}";
		ObjectMapper mapper = new ObjectMapper();
		//JSON ----> JsonNode
        JsonNode rootNode = mapper.readTree(json);  
        Iterator<String> keys = rootNode.fieldNames();   
        while(keys.hasNext()){  
            String fieldName = keys.next();  
            System.out.println(fieldName + ": " + rootNode.path(fieldName).toString());  
        }
        //JsonNode ----> JSON
        System.out.println(mapper.writeValueAsString(rootNode));
	}

}