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java sdk for qcloud cos
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package com.qcloud.cos.utils;

import java.io.File;
import java.io.IOException;
import java.io.Writer;

import com.fasterxml.jackson.core.JsonFactory;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.ObjectWriter;
import com.qcloud.cos.exception.CosClientException;

public enum Jackson {
    ;
    private static final ObjectMapper objectMapper = new ObjectMapper();
    static {
        objectMapper.configure(JsonParser.Feature.ALLOW_COMMENTS, true);
        objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
    };
    private static final ObjectWriter writer = objectMapper.writer();
    private static final ObjectWriter prettyWriter = objectMapper.writerWithDefaultPrettyPrinter();

    public static String toJsonPrettyString(Object value) {
        try {
            return prettyWriter.writeValueAsString(value);
        } catch (Exception e) {
            throw new IllegalStateException(e);
        }
    }

    public static String toJsonString(Object value) {
        try {
            return writer.writeValueAsString(value);
        } catch (Exception e) {
            throw new IllegalStateException(e);
        }
    }

    /**
     * Returns the deserialized object from the given json string and target
     * class; or null if the given json string is null.
     */
    public static  T fromJsonString(String json, Class clazz) {
        if (json == null)
            return null;
        try {
            return objectMapper.readValue(json, clazz);
        } catch (Exception e) {
            throw new CosClientException("Unable to parse Json String.", e);
        }
    }

    public static JsonNode jsonNodeOf(String json) {
        return fromJsonString(json, JsonNode.class);
    }

    public static JsonGenerator jsonGeneratorOf(Writer writer) throws IOException {
        return new JsonFactory().createGenerator(writer);
    }

    public static  T loadFrom(File file, Class clazz) throws IOException {
        try {
            return objectMapper.readValue(file, clazz);
        } catch (IOException e) {
            throw e;
        } catch (Exception e) {
            throw new IllegalStateException(e);
        }
    }

    public static ObjectMapper getObjectMapper() {
        return objectMapper;
    }

    public static ObjectWriter getWriter() {
        return writer;
    }

    public static ObjectWriter getPrettywriter() {
        return prettyWriter;
    }
}