jackson 单例工具

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import java.io.IOException;import org.codehaus.jackson.JsonGenerationException;import org.codehaus.jackson.JsonParseException;import org.codehaus.jackson.map.JsonMappingException;import org.codehaus.jackson.map.ObjectMapper;/** *  @author  - NingZhong.Zeng *  @version - 1.0.0.0 *  @since   - 2014-6-30 下午4:18:41 *  类说明               -  */public class JsonUtil {private static JsonUtil mJosnUtil  = null;private ObjectMapper    mapper     = null;public static JsonUtil getInstance() {if(mJosnUtil == null){synchronized (JsonUtil.class) {if(mJosnUtil == null){mJosnUtil = new JsonUtil();mJosnUtil.mapper = new ObjectMapper();}}}return mJosnUtil;}public String writeJson(Object entity){String str = "";try {str = mapper.disableDefaultTyping().writeValueAsString(entity);} catch (JsonGenerationException e) {e.printStackTrace();} catch (JsonMappingException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}return str;}public <T> T readJson(String jsonStr, Class<T> T){T obj = null;try {obj = mapper.readValue(jsonStr, T);} catch (JsonParseException e) {e.printStackTrace();} catch (JsonMappingException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}return obj;}}
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