import java.io.IOException;  
  
import com.alibaba.fastjson.JSON;  
import com.fasterxml.jackson.core.JsonParser;  
import com.fasterxml.jackson.databind.JsonNode;  
import com.fasterxml.jackson.databind.ObjectMapper;  
  
public class JsonUtil {  
      
    /** 
     * 将字符串转成实体类，允许斜杠等字符串 
     */  
    public static <T> T jsonToEntity(String json, Class<T> clazz) throws IOException {  
        ObjectMapper mapper = new ObjectMapper();  
        // 允许反斜杆等字符  
        mapper.configure(JsonParser.Feature.ALLOW_UNQUOTED_CONTROL_CHARS,true);  
        return mapper.readValue(json, clazz);  
    }  
      
    /** 
     * 实体类转JSON字符串 
     */  
    public static String entityToJson(Object entity){  
        return JSON.toJSONString(entity);  
    }  
      
    /** 
     * 将字符串转成JsonNode，允许斜杠等字符串 
     */  
    public static JsonNode jsonToJsonNode(String json) throws IOException {  
        ObjectMapper mapper = new ObjectMapper();  
        // 允许反斜杆等字符  
        mapper.configure(JsonParser.Feature.ALLOW_UNQUOTED_CONTROL_CHARS,true);  
        //允许单引号  
        mapper.configure(JsonParser.Feature.ALLOW_SINGLE_QUOTES,true);  
        return mapper.readValue(json, JsonNode.class);  
    }  
      
    public static <T> String objectToJson(Object object, Class<T> cls)throws Exception {  
        ObjectMapper mapper = new ObjectMapper();  
        mapper.registerSubtypes(cls);  
        String reqJson = mapper.writeValueAsString(object);  
        return reqJson;  
    }  
      
}