JSON转换代码,Java代码库,德仔网

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【Java】 JSON转换
作者:zyjason91 / 发布于2015/7/9/ 583
使用Jackson包

	import java.text.SimpleDateFormat;
	
	import com.fasterxml.jackson.annotation.JsonInclude.Include;
	import com.fasterxml.jackson.databind.DeserializationFeature;
	import com.fasterxml.jackson.databind.ObjectMapper;
	
	public class JacksonMapper {
	
	 private JacksonMapper() {
	 }
	
	 public static ObjectMapper getInstance() {
	 return SingletonHolder.INSTANCE;
	 }
	
	 private static class SingletonHolder {
	 private final static ObjectMapper INSTANCE = new ObjectMapper();
	 private final static String DEFAULT_DATE_FORMAT = "yyyy-MM-dd HH:mm:ss";
	 static {
	 // 设置输出包含的属性
	 INSTANCE.setSerializationInclusion(Include.NON_NULL);
	 // 设置输入时忽略JSON字符串中存在而Java对象实际没有的属性
	 INSTANCE.configure(
	 DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
	 // INSTANCE.configure(SerializationFeature.REQUIRE_SETTERS_FOR_GETTERS,
	 // true);
	 INSTANCE.configure(
	 DeserializationFeature.FAIL_ON_NULL_FOR_PRIMITIVES, false);
	 INSTANCE.setDateFormat(new SimpleDateFormat(DEFAULT_DATE_FORMAT));
	 }
	 }
	
	}

	

	

	

	import java.io.IOException;
	
	import org.apache.commons.lang3.StringUtils;
	import org.apache.log4j.Logger;
	
	import com.fasterxml.jackson.core.type.TypeReference;
	import com.fasterxml.jackson.databind.ObjectMapper;
	
	public class JsonUtil {
	
	 private static Logger logger = Logger.getLogger(JsonUtil.class);
	
	 private static ObjectMapper jsonMapper = JacksonMapper.getInstance();
	
	 /**
	 * 如果JSON字符串为Null或"null"字符串,返回Null. 如果JSON字符串为"[]",返回空集合.
	 *
	 * 如需读取集合如List/Map,且不是List<String>这种简单类型时使用如下语句:
	 *
	 * <pre>
	 * 
	 * List<MyBean> beanList = fromJson(listString, new TypeReference<List<MyBean>>() {});
	 * 
	 * </pre>
	 */
	 public static <T> T fromJson(String jsonString, Class<T> clazz) throws Exception {
	 if (StringUtils.isEmpty(jsonString)) {
	 return null;
	 }
	
	 try {
	 return jsonMapper.readValue(jsonString, clazz);
	 } catch (IOException e) {
	 logger.error("parse json string error:" + jsonString, e);
	 throw e;
	 }
	 }
	
	 public static <T> T fromJson(String jsonString, TypeReference<T> refType)
	 throws Exception {
	 if (StringUtils.isEmpty(jsonString)) {
	 return null;
	 }
	 try {
	 return jsonMapper.readValue(jsonString, refType);
	 } catch (IOException e) {
	 logger.error("parse json string error:" + jsonString, e);
	 throw e;
	 }
	 }
	
	 /**
	 * 如果对象为Null,返回"null". 如果集合为空集合,返回"[]".
	 */
	 public static String toJson(Object object) throws Exception {
	
	 try {
	 return jsonMapper.writeValueAsString(object);
	 } catch (IOException e) {
	 logger.error("write to json string error:" + object, e);
	 throw e;
	 }
	 }
	}
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