把对象转换为Map的Java工具库：BeanQuery
jopen
9年前
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() 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" } ]