java json-白红宇

java json

阅读量：6194 次

发布时间：2019-06-21

本文共 6200 字，大约阅读时间需要 20 分钟。

import java.io.IOException;import java.lang.reflect.Field;import java.lang.reflect.Method;import java.util.List;import java.util.Map;import java.util.Set;import org.apache.commons.lang.StringUtils;import org.codehaus.jackson.JsonParseException;import org.codehaus.jackson.map.JsonMappingException;import org.codehaus.jackson.map.ObjectMapper;import org.codehaus.jackson.type.TypeReference;public class DataConverter {	/**	 * map 转变成bean	 * @param t	 * @param map	 * @return	 */	@SuppressWarnings({ "unchecked", "rawtypes" })	public static 
    
      T map2Bean(T t,Map map) {  		T entity=null;		try {			Class clazz = t.getClass();  			entity = (T)clazz.newInstance();  			Set
     
       keys = map.keySet();  			for(String key:keys){  				String fieldName = key;  				if(key.equals(key.toUpperCase())){  					Field[] fields = clazz.getDeclaredFields();  					for(Field field: fields){  						if(field.getName().toUpperCase().equals(key)) fieldName=field.getName();  						break;  					}  				}  				try {  					Class
       paramClass = clazz.getDeclaredField(fieldName).getType();  					String methodName = "set"+fieldName.substring(0,1).toUpperCase()+fieldName.substring(1);  					Method method = clazz.getMethod(methodName, paramClass);  					method.invoke(entity, map.get(key));  				} catch (Exception e) {  				}  			}		} catch (InstantiationException e) {			e.printStackTrace();		} catch (IllegalAccessException e) {			e.printStackTrace();		} catch (SecurityException e) {			e.printStackTrace();		}  		return entity;  	}	/**	 * json转map	 * @param jsonStr	 * @return	 */	public static Map
      
        jsonToMap(String jsonStr){		if(StringUtils.isBlank(jsonStr)){			return null;		}		ObjectMapper mapper = null;		try {			mapper = new ObjectMapper();			return mapper.readValue(jsonStr,new TypeReference
       
        
         >(){});		} catch (JsonParseException e) {		} catch (JsonMappingException e) {		} catch (IOException e) {		}finally{			mapper = null;		}		return null;	}	/**	 * map转变为json	 * @param obj	 * @return	 */	public static 
         
           String mapToJson(T obj){ String json = null; if (null == obj) { return json; } ObjectMapper mapper = null; try { mapper = new ObjectMapper(); json = mapper.writeValueAsString(obj); } catch (Exception e) { } finally { mapper = null; } return json; } /** * 将json转化为实体POJO * @param jsonStr * @param obj * @return */ public static
          
            Object json2Obj(Class
           
             clazz,String jsonStr) { T t = null; try { ObjectMapper objectMapper = new ObjectMapper(); t = (T) objectMapper.readValue(jsonStr,clazz); } catch (Exception e) { e.printStackTrace(); } return t; } /** * 将实体POJO（包括集合）转化为JSON * @param obj * @return */ public static
            
              String object2Json(T obj) { ObjectMapper mapper = new ObjectMapper(); String jsonStr = ""; try { jsonStr = mapper.writeValueAsString(obj); } catch (IOException e) { } return jsonStr; } /** * json字符串转变为list集合 * @param clazz * @param json * @return */ @SuppressWarnings("unchecked") public static 
             
               List
              
                json2List(Class
               
                 clazz,String json){ if(json == null){ return null; } net.sf.json.JSONArray jsonArray = net.sf.json.JSONArray.fromObject(json); List
                
                  list = (List
                 
                  ) net.sf.json.JSONArray.toCollection(jsonArray,clazz); return list; } }

import java.io.IOException;import java.lang.reflect.Type;import java.util.ArrayList;import java.util.List;import org.codehaus.jackson.JsonParseException;import org.codehaus.jackson.map.DeserializationConfig;import org.codehaus.jackson.map.JsonMappingException;import org.codehaus.jackson.map.ObjectMapper;import org.codehaus.jackson.map.ser.FilterProvider;import org.codehaus.jackson.map.ser.impl.SimpleBeanPropertyFilter;import org.codehaus.jackson.map.ser.impl.SimpleFilterProvider;import org.codehaus.jackson.type.TypeReference;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.util.StringUtils;public class JsonUtil {	private static Logger logger = LoggerFactory.getLogger(JsonUtil.class) ;	private static ObjectMapper mapper = new ObjectMapper(); //must reuse!!	static{//		java.text.DateFormat df = new java.text.SimpleDateFormat("yyyy-MM-dd HH:mm:ss");//		mapper.getDeserializationConfig().withDateFormat(df);		mapper.configure(DeserializationConfig.Feature.FAIL_ON_UNKNOWN_PROPERTIES, false);	}	public static String serializeToJson(Object obj, String... ignoreProperties) {//		mapper.setSerializationInclusion(JsonSerialize.Inclusion.NON_NULL);		FilterProvider filterProvider = new SimpleFilterProvider().addFilter(				"ignorePropertiesFilter",				SimpleBeanPropertyFilter.serializeAllExcept(ignoreProperties));		String json;		try {			json = mapper.writer(filterProvider).writeValueAsString(obj);		} catch (Exception e) {			throw new RuntimeException(e);		} 		return json;	}	public static 
    
      T unserializeFromJson(String json, Class
     
       clazz)			 {				try {			T object=null;			if(StringUtils.hasText(json)){				object = mapper.readValue(json, clazz);			}						return object;		} catch (Exception e) {			logger.error("can not serialize:"+json);			e.printStackTrace();			throw new RuntimeException(e);		} 	}	public static 
      
        T unserializeFromJson(String json, Type type)	 {		try {			T object=null;			if(StringUtils.hasText(json)){				object = mapper.readValue(json, mapper.getTypeFactory().constructType(type));			}						return object;		} catch (Exception e) {			logger.error("can not serialize:"+json);			e.printStackTrace();			throw new RuntimeException(e);		} 	}		public static 
       
         List
        
          unserializeFromJsonAsList(String json,			Class
         
           cls) { try { List
          
            object = mapper.readValue(json, mapper.getTypeFactory() .constructCollectionType(ArrayList.class, cls)); return object; } catch (Exception e) { e.printStackTrace(); throw new RuntimeException(e); } } public static 
           
             T unserializeFromJsonByTypeReference(String json, TypeReference
            
              typeReference) throws JsonParseException, JsonMappingException, IOException { T object = mapper.readValue(json, typeReference); return object; } public static 
             
               T convertValue(Object fromValue, Class
              
                toValueType){ return mapper.convertValue(fromValue, toValueType); }}