spring mvc拦截器过滤json中的null值

package com.estronger.web.util; import java.io.IOException; import com.fasterxml.jackson.databind.ObjectMapper; import com.fasterxml.jackson.core.JsonGenerator; import com.fasterxml.jackson.core.JsonProcessingException; import com.fasterxml.jackson.databind.JsonSerializer; import com.fasterxml.jackson.databind.SerializerProvider; /** * * @author * @description: 转换null对象为空字符串 * */ public class JsonObjectMapper extends ObjectMapper { private static final long serialVersionUID = 1L; public JsonObjectMapper() { super(); // 空值处理为空串 this.getSerializerProvider().setNullValueSerializer(new JsonSerializer<Object>() { @Override public void serialize(Object value, JsonGenerator jg, SerializerProvider sp) throws IOException, JsonProcessingException { jg.writeString(""); } }); } }