The null attribute is stripped when the object is converted to a JSON string, and the use of the enumeration class

Import Java.lang.reflect.Field;

Import Java.util.Date;

Import Java.util.Map;

Import Org.hibernate.Hibernate;

Import abc.dao.Student;

Import Com.alibaba.fastjson.serializer.JSONSerializer;

Import Com.alibaba.fastjson.serializer.PropertyPreFilter;

Import Com.alibaba.fastjson.serializer.SerializeWriter;

Import Com.alibaba.fastjson.serializer.SerializerFeature;

public class Jsonutils {

public static String toJSONString (Object object, Boolean Filternull, serializerfeature[] features) {

Serializewriter out = new Serializewriter ();

Jsonserializer serializer = new Jsonserializer (out);

for (int i = 0; i < features.length; i++) {

Serializerfeature feature = Features[i];

Serializer.config (feature, true);

}

Serializer.setdateformat ("Yyyy-mm-dd HH:mm:ss");

Serializer.config (Serializerfeature.writedateusedateformat, true);

Determining whether to serialize according to PropertyName

Serializer.getpropertyprefilters (). Add (New Propertyprefilter () {

public Boolean apply (Jsonserializer serializer, Object object, String name) {

try {

if ((Object instanceof Map) | | ((Object instanceof iterable))) {

return true;

}

Field f = Object.getclass (). Getdeclaredfield (name);

if (!f.isaccessible ()) {

F.setaccessible (TRUE);

}

Object val = F.get (object);

Return Hibernate.isinitialized (Val);

} catch (Nosuchfieldexception localnosuchfieldexception) {

} catch (Exception e) {

E.printstacktrace ();

}

return false;

}

});

Serializer.write (object);

String s = out.tostring ();

Out.close ();

return s;

}

public static String toJSONString (Object object) {

Return toJSONString (object, False, new serializerfeature[0]);

}

public static void Main (string[] args) {

Student AA = new Student ();

Aa.setname ("Lxg");

Aa.setbirstday (New Date ());

System.out.println (tojsonstring (AA));

}

}

Defines an enumeration class that can also define methods and properties in an enumeration class, so that the enumeration object has corresponding methods and properties.

It is more convenient to use, for example: String name = SearchType.SaveHistory.name;

Enumeration classes can actually be replaced with static constant classes, but they cannot be used as enumeration classes, and properties and methods can be redefined for constants.

public enum SearchType {

SaveHistory ("savehisply cost", "Save History", "1"),

Quote ("============== quote processing", "quote", "2"),

Edrapply ("============== submit a correction request Form", "Submit Application", "3"),

Edrapplyumstask ("Correcting tasks: Edrapplyumstask", "Creating data Audit Tasks", "4");

public String keyword;

public String name;

Public String Code;

Private SearchType (string keyword, string name, string code) {

This.keyword = keyword;

THIS.name = name;

This.code = code;

}

public static SearchType Matchbycode (String c) {

if ("1". Equals (c))

return savehistory;

if ("2". Equals (c))

return Quote;

if ("3". Equals (c)) {

return edrapply;

}

if ("4". Equals (c)) {

return edrapplyumstask;

}

return null;

}

}

http://www.csdn.net/article/2014-09-25/2821866

Here's the information about SPRINGMVC.

http://jinnianshilongnian.iteye.com/blog/1594806

Http://www.admin10000.com/document/6436.html

The null attribute is stripped when the object is converted to a JSON string, and the use of the enumeration class