对日期的序列化:
一种方法是通过注解
@JSONField (format="yyyy-MM-dd HH:mm:ss") public Date birthday;
另一种是通过SerializeConfig:
private static SerializeConfig mapping = new SerializeConfig(); private static String dateFormat; static { dateFormat = "yyyy-MM-dd HH:mm:ss"; mapping.put(Date.class, new SimpleDateFormatSerializer(dateFormat)); }
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json字符串中使用单引号:
String text = JSON.toJSONString(object, SerializerFeature.UseSingleQuotes);
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字段显示不同的key:
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public class User { @JSONField(name="ID") public int getId() { ... } } User user = ...; JSON.toJSONString(user); // {"ID":001}
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类的反序列化 JavaBean:
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String text = ...; // {"r":255,"g":0,"b":0,"alpha":255} Color color = JSON.parseObject(text, Color.class);
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数组:
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String text = ...; // [{ ... }, { ... }] List<User> users = JSON.parseArray(text, User.class);
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泛型:
String text = ...; // {"name":{"name":"ljw",age:18}} Map<String, User> userMap = JSON.parseObject(text, new TypeReference<Map<String, User>>() {});
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自定义序列化代码示例:
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public class JsonUtil { private static SerializeConfig mapping = new SerializeConfig(); private static String dateFormat; static { dateFormat = "yyyy-MM-dd HH:mm:ss"; } /** * 默认的处理时间 * * @param jsonText * @return */ public static String toJSON(Object jsonText) { return JSON.toJSONString(jsonText, SerializerFeature.WriteDateUseDateFormat); } /** * 自定义时间格式 * * @param jsonText * @return */ public static String toJSON(String dateFormat, String jsonText) { mapping.put(Date.class, new SimpleDateFormatSerializer(dateFormat)); return JSON.toJSONString(jsonText, mapping); } }
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自定义反序列化示例:
先自定义一个日期解析类:
public class MyDateFormatDeserializer extends DateFormatDeserializer { private String myFormat; public MyDateFormatDeserializer(String myFormat) { super(); this.myFormat = myFormat; } @Override protected <Date> Date cast(DefaultJSONParser parser, Type clazz, Object fieldName, Object val) { if (myFormat == null) { return null; } if (val instanceof String) { String strVal = (String) val; if (strVal.length() == 0) { return null; } try { return (Date) new SimpleDateFormat(myFormat).parse((String)val); } catch (ParseException e) { throw new JSONException("parse error"); } } throw new JSONException("parse error"); } }
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public class User { public String name; public int height; @JSONField(name = "com-google-com") public void setName(String name) { this.name