Jackson实现的json操作工具类

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1.基于jackson实现的json操作工具类

import org.codehaus.jackson.JsonFactory;import org.codehaus.jackson.JsonGenerator;import org.codehaus.jackson.JsonParseException;import org.codehaus.jackson.map.JsonMappingException;import org.codehaus.jackson.map.ObjectMapper;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import java.io.IOException;import java.io.StringWriter;public class JacksonUtil {  private static Logger logger = LoggerFactory.getLogger(JacksonUtil.class);  public static final ObjectMapper mapper = new ObjectMapper();  public static String toJson(Object obj) {      StringWriter writer = new StringWriter();      JsonGenerator gen;      try {        gen = new JsonFactory().createJsonGenerator(writer);        mapper.writeValue(gen, obj);        gen.close();        String json = writer.toString();        writer.close();        return json;      } catch (IOException e) {        logger.warn(e.getMessage(),e);      }      return null;  }  public static <T> T fromJson(String json, Class<T> classOfT) {      Object object;      try {        object = mapper.readValue(json, classOfT);        return (T) object;        } catch (JsonParseException e) {            logger.error(e.getMessage(), e);        } catch (JsonMappingException e) {            logger.error(e.getMessage(), e);        } catch (IOException e) {            logger.error(e.getMessage(),e);        }      return null;  }}

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