标签：java map query bean-query bean query
刚开源了一个经过完整测试的Java工具类。目前的代码已经经历了完整的测试，正在申请放到Maven central Repository上。Click Here for English version.
BeanQuery 是一个把对象转换为Map的Java工具库。支持选择Bean中的一些属性，对结果进行排序和按照条件查询。不仅仅可以作用于顶层对象，也可以作用于子对象。
BeanQuery的使用非常简单也很直接，例子代码如下：
/静态导入BeanQuery
import static cn.jimmyshi.beanquery.BeanQuery.*;
//使用 select、from、where、orderBy、desc和asc来组装一个Query，然后执行execute方法来获得结果。
List<Map<String, Object>> result = select("price,name,mainAuthor.name as mainAuthorName")
.from(bookCollection)
.where(
//for books name is Book2 or starts with Book1
anyOf(
value("name", startsWith("Book1")),
value("name", is("Book2"))
),
//for books price between (53,65)
allOf(
value("price", greaterThan(53d)),
value("price",lessThan(65d))
)
)
.orderBy("name").desc()
.execute();
[
{
"price":55.55,
"name":"Book1",
"mainAuthor":{
"name":"Book1-MainAuthor",
"address":{
"address":"Shenzhen Guangdong China",
"postCode":"518000"
},
"birthDate":"1982-01-30T14:52:39"
}
},
{
"price":52.55,
"name":"Book12",
"mainAuthor":{
"name":"Book1-MainAuthor",
"address":{
"address":"Shenzhen Guangdong China",
"postCode":"518000"
},
"birthDate":"1982-01-30T14:52:39"
}
},
{
"price":53.55,
"name":"Book13",
"mainAuthor":{
"name":"Book13-MainAuthor",
"address":{
"address":"Shenzhen Guangdong China",
"postCode":"518000"
},
"birthDate":"1982-01-30T14:52:39"
}
},
{
"price":60.0,
"name":"Book14",
"mainAuthor":{
"name":"Book14-MainAuthor",
"address":{
"address":"Shenzhen Guangdong China",
"postCode":"518000"
},
"birthDate":"1982-01-30T14:52:39"
}
},
{
"price":50.55,
"name":"Book15",
"mainAuthor":{
"name":"Book1-MainAuthor",
"address":{
"address":"Shenzhen Guangdong China",
"postCode":"518000"
},
"birthDate":"1982-01-30T14:52:39"
}
},
{
"price":77.77,
"name":"Book3",
"mainAuthor":{
"name":"Book3-MainAuthor",
"address":{
"address":"Shenzhen Guangdong China",
"postCode":"518005"
},
"birthDate":"1982-01-30T14:52:39"
}
}
,
{
"price":66.66,
"name":"Book2",
"mainAuthor":{
"name":"Book2-MainAuthor",
"address":{
"address":"Shenzhen Guangdong China",
"postCode":"518005"
},
"birthDate":"1982-01-30T14:52:39"
}
}
]
[
{
"price":60.0,
"name":"Book14",
"mainAuthorName":"Book14-MainAuthor"
},
{
"price":53.55,
"name":"Book13",
"mainAuthorName":"Book13-MainAuthor"
},
{
"price":55.55,
"name":"Book1",
"mainAuthorName":"Book1-MainAuthor"
}
]Bean-Query 一个把对象转换为Map的Java工具库
标签：java map query bean-query bean query
原文地址：http://blog.csdn.net/justfly/article/details/40486881
