Java json工具类，jackson工具类，ObjectMapper工具类

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蕃薯耀 2016年8月23日 15:39:18 星期二

http://fanshuyao.iteye.com/

附件有下载！

package com.chinagas.org.common.utils;

import java.io.IOException;

import java.text.SimpleDateFormat;

import java.util.ArrayList;

import org.codehaus.jackson.JsonGenerationException;

import org.codehaus.jackson.JsonParser.Feature;

import org.codehaus.jackson.map.DeserializationConfig;

import org.codehaus.jackson.map.JsonMappingException;

import org.codehaus.jackson.map.ObjectMapper;

import org.codehaus.jackson.type.JavaType;

import org.codehaus.jackson.type.TypeReference;

public class JacksonUtils {

	/**

	 * 实体对象转换成Json字符串

	 * @param t 实体对象T

	 * @return T

	 */

	public  static <T> String objectToJson(T t){

		ObjectMapper mapper = new ObjectMapper();

		mapper.configure(Feature.ALLOW_SINGLE_QUOTES, true);//设置可用单引号

		mapper.configure(Feature.ALLOW_UNQUOTED_FIELD_NAMES, true);//设置字段可以不用双引号包括

		mapper.setDateFormat(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"));//设置时间格式

		try {

			return mapper.writeValueAsString(t);

		} catch (JsonGenerationException e) {

			e.printStackTrace();

		} catch (JsonMappingException e) {

			e.printStackTrace();

		} catch (IOException e) {

			e.printStackTrace();

		}

		return null;

	}

	/**

	 * Json字符串转换成实体对象

	 * @param json

	 * @param clazz 实体对象所属类Class

	 * @return

	 */

	public  static <T> T jsonToObject(String json, Class<T> clazz){

		ObjectMapper mapper = new ObjectMapper();

		mapper.configure(Feature.ALLOW_SINGLE_QUOTES, true);//设置可用单引号

		mapper.configure(Feature.ALLOW_UNQUOTED_FIELD_NAMES, true);//设置字段可以不用双引号包括

		mapper.setDateFormat(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"));//设置时间格式

		mapper.disable(DeserializationConfig.Feature.FAIL_ON_UNKNOWN_PROPERTIES);//设置实体无属性和json串属性对应时不会出错

		try {

			return mapper.readValue(json, clazz);

		} catch (JsonGenerationException e) {

			e.printStackTrace();

		} catch (JsonMappingException e) {

			e.printStackTrace();

		} catch (IOException e) {

			e.printStackTrace();

		}

		return null;

	}

	/**

	 * Json字符串转换成List

	 * @param json

	 * @param clazz 实体对象所属类Class

	 * @return

	 */

	public  static <T> T jsonToList(String json, Class<T> clazz){

		ObjectMapper mapper = new ObjectMapper();

		mapper.configure(Feature.ALLOW_SINGLE_QUOTES, true);//设置可用单引号

		mapper.configure(Feature.ALLOW_UNQUOTED_FIELD_NAMES, true);//设置字段可以不用双引号包括

		mapper.setDateFormat(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"));

		mapper.disable(DeserializationConfig.Feature.FAIL_ON_UNKNOWN_PROPERTIES);

		try {

			JavaType javaType = mapper.getTypeFactory().constructParametricType(ArrayList.class, clazz);

			return mapper.readValue(json, javaType);

		} catch (JsonGenerationException e) {

			e.printStackTrace();

		} catch (JsonMappingException e) {

			e.printStackTrace();

		} catch (IOException e) {

			e.printStackTrace();

		}

		return null;

	}

	/**

	 * Json字符串转换成List

	 * @param json

	 * @param typeReference TypeReference<T>

	 * <p>

	 * 	<pre>new TypeReference<List<User>>() {}</pre>

	 * </p>

	 * @return

	 */

	public static <T> T jsonToList(String json, TypeReference<T> typeReference){

		ObjectMapper mapper = new ObjectMapper();

		mapper.configure(Feature.ALLOW_SINGLE_QUOTES, true);//设置可用单引号

		mapper.configure(Feature.ALLOW_UNQUOTED_FIELD_NAMES, true);//设置字段可以不用双引号包括

		mapper.setDateFormat(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"));

		mapper.disable(DeserializationConfig.Feature.FAIL_ON_UNKNOWN_PROPERTIES);

		try {

			return mapper.readValue(json, typeReference);

		} catch (Exception e) {

			e.printStackTrace();

		}

		return null;

	}

	/**

	 *  美化输出

	 * @param t

	 * @return

	 */

	public  static <T> String console(T t){

		ObjectMapper mapper = new ObjectMapper();

		mapper.configure(Feature.ALLOW_SINGLE_QUOTES, true);//设置可用单引号

		mapper.configure(Feature.ALLOW_UNQUOTED_FIELD_NAMES, true);//设置字段可以不用双引号包括

		mapper.setDateFormat(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"));

		String json = "";

		try {

			json = mapper.writerWithDefaultPrettyPrinter().writeValueAsString(t);

		} catch (JsonGenerationException e) {

			e.printStackTrace();

		} catch (JsonMappingException e) {

			e.printStackTrace();

		} catch (IOException e) {

			e.printStackTrace();

		}

		return json;

	}

}

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

蕃薯耀 2016年8月23日 15:39:18 星期二

http://fanshuyao.iteye.com/