刚开源了一个经过完整测试的Java工具类。
地址如下：
https://github.com/Jimmy-Shi/bean-query
使用说明如下：
Bean-query
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：
1 //静态导入BeanQuery
2 import static cn.jimmyshi.beanquery.BeanQuery.*;
3
4
5 //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。
6 List<Map<String, Object>> result = select("price,name,mainAuthor.name as mainAuthorName")
7 .from(bookCollection)
8 .where(
9 //for books name is Book2 or starts with Book1
10 anyOf(
11 value("name", startsWith("Book1")),
12 value("name", is("Book2"))
13 ),
14 //for books price between (53,65)
15 allOf(
16 value("price", greaterThan(53d)),
17 value("price",lessThan(65d))
18 )
19 )
20 .orderBy("name").desc()
21 .execute();
在上面的例子中，bookCollection的内容如下所示(json格式)
[
{
"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"
}
}
]
执行完之后，则result的内容如下所示(json格式)
[
{
"price":60.0,
"name":"Book14",
"mainAuthorName":"Book14-MainAuthor"
},
{
"price":53.55,
"name":"Book13",
"mainAuthorName":"Book13-MainAuthor"
},
{
"price":55.55,
"name":"Book1",
"mainAuthorName":"Book1-MainAuthor"
}
]