反序列化JSON

本人编程生涯刚刚起步，以下是个人理解，如果有些不对的地方，请各位在评论区指出，如果有更详细的博客也可以推荐给我。

首先要根据JSON创建一个实体类，并且要实现Serializable接口，再创建一个JacksonUtils工具类

 import java.io.Serializable;

  public class Opst implements Serializable{

      private long dataCount;
      private long mediaCount;

      public long getDataCount() {
          return dataCount;
      }

      public void setDataCount(long dataCount) {
          this.dataCount = dataCount;
      }

      public long getMediaCount() {
          return mediaCount;
      }

      public void setMediaCount(long mediaCount) {
          this.mediaCount = mediaCount;
      }

  }

 import com.fasterxml.jackson.databind.ObjectMapper;
 import com.fasterxml.jackson.databind.ObjectWriter;

 import java.io.File;
 import java.io.IOException;
 import java.io.Writer;

 public final class JacksonUtils {

     private static final ObjectMapper OBJECT_MAPPER = new ObjectMapper();
 public static <T> T fromJsonString(String json, Class<T> clazz) {
         if (json == null)
             return null;
         try {
             return OBJECT_MAPPER.readValue(json, clazz);
         } catch (Exception e) {
             throw new RuntimeException("Unable to parse Json String.", e);
         }
         return null;
     }
 }

然后就可以反序列化了，以下是测试代码

import com.mhl.common.util.JacksonUtils;

  public static void main(String[] args) {
          String a="{\"dataCount\":29833,\"mediaCount\":4123}";
          Opst opst = JacksonUtils.fromJsonString(a, Opst.class);
          System.out.println(opst.getDataCount());
          System.out.println(opst.getMediaCount());
      }

输出结果

29833

4123