对象转换成json串时,将null属性去除;以及枚举类的使用

标签：features   object   public   null   import   

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);

//根据PropertyName判断是否序列化

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));

}

}

//定义一个枚举类,枚举类中也可以定义方法，属性；这样枚举对象就有对应的方法和属性了。

//使用时就比较方便了，例如：String name = SearchType.SaveHistory.name;

//枚举类其实可以用静态常量类代替，但是其不能像枚举类那样，又可以为常量再定义属性和方法。

public enum SearchType {

SaveHistory("saveHisPly cost", "保存历史", "1"), 

Quote("==============报价处理", "报价", "2"), 

EdrApply("==============提交批改申请单", "提交申请", "3"),

EdrApplyUMSTask("批改任务:EdrApplyUMSTask", "创建资料审核任务", "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

下面是springmvc的相关资料

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

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

对象转换成json串时,将null属性去除;以及枚举类的使用

标签：features   object   public   null   import   

原文地址：http://6817977.blog.51cto.com/6807977/1765905