Study Notes of Json

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Json 笔记

Fastjson

json string > List

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List<User> userList = JSON.parseArray(userStr, User.class);

SimplePropertyPreFilter

剔除某个属性

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// 去掉 product 中的 productText 字段
SimplePropertyPreFilter filter = new SimplePropertyPreFilter();
filter.getExcludes().add("productText");
JSON.toJSONString(product, filter);

自定义序列化与反序列化

自定义序列化

JSON最佳实践

使用serializeUsing制定属性的序列化类

Java Unescape HTML to String Example - HowToDoInJava

转换 productTitle 字段中包含的 HTML 特殊字符

  1. 自定义序列化器

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    import org.apache.commons.text.StringEscapeUtils;

    public class StringEscapeSerialization implements ObjectSerializer {

      @Override
      public void write(JSONSerializer serializer, Object object, Object fieldName, Type fieldType, int features) throws IOException {
        SerializeWriter out = serializer.out;
        if (object == null) {
          out.writeNull();
        } else if (object instanceof String) {
          out.writeString(StringEscapeUtils.unescapeHtml4((String) object));
        }
      }
    }

  2. 使用自定义的序列化器

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    public class Product {

      @JSONField(serializeUsing= StringEscapeSerialization.class)
      private String productTitle;
    }

  3. 测试

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    public static void main(String[] args) {
      Product product = new Product();
      product.setProductTitle("iPhone X Pro &quot;HK&quot;");
      String s = JSON.toJSONString(product);
      System.out.println(s);
    }

  4. 结果

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    {"productTitle":"iPhone X Pro \"HK\""}

json-smart

GSON