Jackson的基本使用

最近看到好多人和测试结果都证明Jackson解析速度比gson快，所以记录一下Jackson的基本使用

导入依赖

 compile 'com.fasterxml.jackson.core:jackson-core:2.9.0'
 compile 'com.fasterxml.jackson.core:jackson-annotations:2.9.0'
 compile 'com.fasterxml.jackson.core:jackson-databind:2.9.0'

使用工具类

import com.fasterxml.jackson.core.JsonFactory;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.ObjectMapper;

import java.io.IOException;
import java.io.StringWriter;

public class JsonUtil {
    private static ObjectMapper mapper = new ObjectMapper();

    public static String parseObjectToJsonString(Object obj) {
        StringWriter sw = new StringWriter();
        JsonGenerator gen = null;
        try {
            gen = new JsonFactory().createJsonGenerator(sw);
            mapper.writeValue(gen, obj);
            gen.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return sw.toString();
    }

    public static <T> T parseJsonToObject(String jsonStr, Class<T> objClass) {
        try {
            return mapper.readValue(jsonStr, objClass);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }

}