jackson jsonUtil

本文主要是介绍jackson jsonUtil，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

/** 
* CopyRright                          
* Project: asg                                            
* Comments:      json转换工具             
* JDK version used:      <JDK1.6>                              
* Author：       junlee              
* Create Date：  YYYY-MM-DD
* Modified By：  junlee                                    
* Modified Date:  YYYY-MM-DD    
* Email : firehub@163.com                               
* Why & What is modified   
* Version:  1.0                  
*/
package systems.baseutil.json;import java.io.IOException;
import java.io.InputStream;
import java.io.StringWriter;
import java.util.ArrayList;
import java.util.List;import javax.servlet.http.HttpServletRequest;import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
import net.sf.json.JSONSerializer;import org.apache.commons.lang.StringUtils;
import org.codehaus.jackson.JsonGenerationException;
import org.codehaus.jackson.JsonParseException;
import org.codehaus.jackson.JsonParser;
import org.codehaus.jackson.map.DeserializationConfig;
import org.codehaus.jackson.map.JsonMappingException;
import org.codehaus.jackson.map.ObjectMapper;
import org.codehaus.jackson.type.JavaType;public class JsonUtils {/*** java 对象转换为 json 字符串* * @param obj*            对象* @return json*/public static String toJSON(Object obj) {StringWriter writer = new StringWriter();try {mapper.writeValue(writer, obj);} catch (JsonGenerationException e) {throw new RuntimeException(e);} catch (JsonMappingException e) {throw new RuntimeException(e);} catch (IOException e) {throw new RuntimeException(e);}String result = writer.toString();return (null == result) ? "" : result.replaceAll("null", "\"\"");}private static ObjectMapper mapper = new ObjectMapper();static{mapper.configure(JsonParser.Feature.ALLOW_UNQUOTED_CONTROL_CHARS, true);mapper.configure(DeserializationConfig.Feature.FAIL_ON_UNKNOWN_PROPERTIES, false);}/*** 反序列化复杂Collection如List<Bean>, 先使用createCollectionType构造类型,然后调用本函数.* @see #createCollectionType(Class, Class...)*/@SuppressWarnings("unchecked")public static <T> T fromJson(String jsonString, JavaType javaType) {if (StringUtils.isEmpty(jsonString)) {return null;}try {return (T) mapper.readValue(jsonString, javaType);} catch (IOException e) {e.printStackTrace();return null;}}/*** 构造的Collection Type如:* ArrayList<Bean>, 则调用constructCollectionType(ArrayList.class,Bean.class)* HashMap<String,Bean>, 则调用(HashMap.class,String.class, Bean.class)*/public static JavaType createCollectionType(Class<?> collectionClass, Class<?>... elementClasses) {return mapper.getTypeFactory().constructParametricType(collectionClass, elementClasses);}/*** json字符串转换为对象* * @param <T>* @param json*            json字符串* @param clazz*            要转换对象的class* @return 对象*/public static <T> T fromJSON(String json, Class<T> clazz) {try {return mapper.readValue(json, clazz);} catch (JsonParseException e) {throw new RuntimeException(e);} catch (JsonMappingException e) {throw new RuntimeException(e);} catch (IOException e) {throw new RuntimeException(e);}}/*** json的字节流转换为对象* * @param <T>* @param request*            HttpServletRequest* @param clazz*            要转换对象的class* @return 对象*/public static <T> T getRequestFromObject(HttpServletRequest request,Class<T> clazz) {try {return fromJSON(request.getInputStream(), clazz);} catch (IOException e) {e.printStackTrace();}return null;}/*** json的字节流转换为对象* * @param <T>* @param json*            json的字节流* @param clazz*            要转换对象的class* @return 对象*/public static <T> T fromJSON(InputStream json, Class<T> clazz) {try {return mapper.readValue(json, clazz);} catch (JsonParseException e) {throw new RuntimeException(e);} catch (JsonMappingException e) {throw new RuntimeException(e);} catch (IOException e) {throw new RuntimeException(e);}}public static List<Object> getJsonList(String jstr, List<Object> li) {char[] cstr = jstr.toCharArray();boolean bend = false;int istart = 0;int iend = 0;for (int i = 0; i < cstr.length; i++) {if ((cstr[i] == '{') && !bend) {istart = i;}if (cstr[i] == '}' && !bend) {iend = i;bend = true;}}if (istart != 0) {String substr = jstr.substring(istart, iend + 1);jstr = jstr.substring(0, istart - 1)+ jstr.substring(iend + 1, jstr.length());substr = substr.replace(",\"children\":", "");substr = substr.replace("]", "");substr = substr.replace("[", "");li.add(substr);getJsonList(jstr, li);}return li;}/*** 封装将json对象转换为java集合对象* * @param <T>* @param clazz* @param jsons* @return*/@SuppressWarnings("unchecked")public static <T> List<T> getJavaCollection(T clazz, String jsons) {List<T> objs = null;JSONArray jsonArray = (JSONArray) JSONSerializer.toJSON(jsons);if (jsonArray != null) {objs = new ArrayList<T>();List list = (List) JSONSerializer.toJava(jsonArray);for (Object o : list) {JSONObject jsonObject = JSONObject.fromObject(o);T obj = (T) JSONObject.toBean(jsonObject, clazz.getClass());objs.add(obj);}}return objs;}/*** 封装PUB对象*/ public static PubModo setPubModo( String json) {PubModo pub= new PubModo();JSONObject obj = JSONObject.fromObject(json);JSONObject pubobj=obj.getJSONObject("pub");if(pubobj.containsKey("userId")){pub.setUserId(pubobj.getString("userId"));}if(pubobj.containsKey("apiVersion")){pub.setApiVersion(pubobj.getString("apiVersion"));}if(pubobj.containsKey("clientHash")){pub.setClientHash(pubobj.getString("clientHash"));}if(pubobj.containsKey("screen")){pub.setScreen(pubobj.getString("screen"));}if(pubobj.containsKey("os")){pub.setOs(pubobj.getString("os"));}if(pubobj.containsKey("model")){pub.setModel(pubobj.getString("model"));}if(pubobj.containsKey("channelCode")){pub.setChannelCode(pubobj.getString("channelCode"));}if(pubobj.containsKey("userId")){pub.setUserId(pubobj.getString("userId"));}if(pubobj.containsKey("imei")){pub.setImei(pubobj.getString("imei"));}if(pubobj.containsKey("imsi")){pub.setImsi(pubobj.getString("imsi"));}if(pubobj.containsKey("clientAgent")){pub.setClientAgent(pubobj.getString("clientAgent"));}if(pubobj.containsKey("appCode")){pub.setAppCode(pubobj.getString("appCode"));}		if(pubobj.containsKey("pname")){pub.setPname(pubobj.getString("pname"));}	if(pubobj.containsKey("apn")){pub.setApn(pubobj.getString("apn"));}return pub;}}

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