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

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/

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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/