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memfactory-utils
There is a newer version: 0.0.25
package com.memfactory.utils;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.Reader;
import java.io.Writer;
import java.net.URL;
import java.text.DateFormat;
import java.text.SimpleDateFormat;

import org.codehaus.jackson.JsonGenerationException;
import org.codehaus.jackson.JsonParseException;
import org.codehaus.jackson.map.DeserializationConfig;
import org.codehaus.jackson.map.JsonMappingException;
import org.codehaus.jackson.map.ObjectMapper;
import org.codehaus.jackson.map.SerializationConfig;
import org.codehaus.jackson.map.annotate.JsonSerialize.Inclusion;
import org.codehaus.jackson.type.JavaType;

/**
 * 
 * @author zhairp
 * createDate: 2018-09-04
 */
public class JsonFormatter {

	private static final ThreadLocal MAPPER_NULL_LOCAL = new ThreadLocal();

	private static final ThreadLocal MAPPER_NOT_NULL_LOCAL = new ThreadLocal();

	private static ObjectMapper get(boolean serializeNull) {
		ThreadLocal tl = serializeNull ? MAPPER_NULL_LOCAL : MAPPER_NOT_NULL_LOCAL;
		if (null == tl.get()) {
			ObjectMapper objMapper = new ObjectMapper();
			objMapper.disable(new DeserializationConfig.Feature[] { DeserializationConfig.Feature.FAIL_ON_UNKNOWN_PROPERTIES });
			objMapper.setDateFormat(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"));
			if (!serializeNull) {
				objMapper.setSerializationInclusion(Inclusion.NON_NULL);
				objMapper.disable(new SerializationConfig.Feature[] { SerializationConfig.Feature.WRITE_NULL_MAP_VALUES });
			}
			tl.set(objMapper);
		}
		return tl.get();
	}

	public static void setDateFormat(DateFormat dateFormat) {
		get(true).setDateFormat(dateFormat);
		get(false).setDateFormat(dateFormat);
	}

	// 以下是带默认参数(允许为空)的反序列化方法
	public static  T toObject(String content, Class type) throws JsonParseException, JsonMappingException, IOException {
		return toObject(content, type, true);
	}

	public static  T toObject(String content, Class collectionClass, Class... elementClasses) throws JsonParseException, JsonMappingException, IOException {
		return get(true).readValue(content, getCollectionType(get(true), collectionClass, elementClasses));
	}

	private static JavaType getCollectionType(ObjectMapper mapper, Class collectionClass, Class... elementClasses) {
		return mapper.getTypeFactory().constructParametricType(collectionClass, elementClasses);
	}

	public static  T toObject(File src, Class type) throws JsonParseException, JsonMappingException, IOException {
		return toObject(src, type, true);
	}

	public static  T toObject(InputStream in, Class type) throws JsonParseException, JsonMappingException, IOException {
		return toObject(in, type, true);
	}

	public static  T toObject(Reader reader, Class type) throws JsonParseException, JsonMappingException, IOException {
		return toObject(reader, type, true);
	}

	public static  T toObject(URL url, Class type) throws JsonParseException, JsonMappingException, IOException {
		return toObject(url, type, true);
	}

	public static  T toObject(byte[] src, Class type) throws JsonParseException, JsonMappingException, IOException {
		return toObject(src, type, true);
	}

	// 以下是带参数(是否允许为空)的反序列化方法
	public static  T toObject(String content, Class type, boolean serializeNull) throws JsonParseException, JsonMappingException, IOException {
		return get(serializeNull).readValue(content, type);
	}

	public static  T toObject(File src, Class type, boolean serializeNull) throws JsonParseException, JsonMappingException, IOException {
		return get(serializeNull).readValue(src, type);
	}

	public static  T toObject(InputStream in, Class type, boolean serializeNull) throws JsonParseException, JsonMappingException, IOException {
		return get(serializeNull).readValue(in, type);
	}

	public static  T toObject(Reader reader, Class type, boolean serializeNull) throws JsonParseException, JsonMappingException, IOException {
		return get(serializeNull).readValue(reader, type);
	}

	public static  T toObject(URL url, Class type, boolean serializeNull) throws JsonParseException, JsonMappingException, IOException {
		return get(serializeNull).readValue(url, type);
	}

	public static  T toObject(byte[] src, Class type, boolean serializeNull) throws JsonParseException, JsonMappingException, IOException {
		return get(serializeNull).readValue(src, type);
	}

	// 以下是带默认参数(允许为空)的序列化方法
	public static String toJsonAsString(Object value) throws JsonGenerationException, JsonMappingException, IOException {
		return toJsonAsString(value, true);
	}

	public static byte[] toJsonAsByte(Object value) throws JsonGenerationException, JsonMappingException, IOException {
		return toJsonAsByte(value, true);
	}

	public static void toJsonToFile(File resultFile, Object value) throws JsonGenerationException, JsonMappingException, IOException {
		toJsonToFile(resultFile, value, true);
	}

	public static void toJsonToOutputSteam(OutputStream out, Object value) throws JsonGenerationException, JsonMappingException, IOException {
		toJsonToOutputSteam(out, value, true);
	}

	public static void toJsonToWriter(Writer writer, Object value) throws JsonGenerationException, JsonMappingException, IOException {
		toJsonToWriter(writer, value, true);
	}

	// 以下是带参数(是否允许为空)的序列化方法
	public static String toJsonAsString(Object value, boolean serializeNull) throws JsonGenerationException, JsonMappingException, IOException {
		return get(serializeNull).writeValueAsString(value);
	}

	public static byte[] toJsonAsByte(Object value, boolean serializeNull) throws JsonGenerationException, JsonMappingException, IOException {
		return get(serializeNull).writeValueAsBytes(value);
	}

	public static void toJsonToFile(File resultFile, Object value, boolean serializeNull) throws JsonGenerationException, JsonMappingException, IOException {
		get(serializeNull).writeValue(resultFile, value);
	}

	public static void toJsonToOutputSteam(OutputStream out, Object value, boolean serializeNull) throws JsonGenerationException, JsonMappingException, IOException {
		get(serializeNull).writeValue(out, value);
	}

	public static void toJsonToWriter(Writer writer, Object value, boolean serializeNull) throws JsonGenerationException, JsonMappingException, IOException {
		get(serializeNull).writeValue(writer, value);
	}

}