Beanutils （1）

PropertyUtils类：负责对Bean的重新设置和更改，支持3种属性，Simple ，Indexed ，Mapped 。

Simple：

Employee employee = ...;
String firstName = (String)
PropertyUtils.getSimpleProperty(employee, "firstName");
String lastName = (String)
PropertyUtils.getSimpleProperty(employee, "lastName");
... manipulate the values ...
PropertyUtils.setSimpleProperty(employee, "firstName", firstName);
PropertyUtils.setSimpleProperty(employee, "lastName", lastName);

Indexed：

Employee employee = ...;
int index = ...;
String name = "subordinate[" index "]";
Employee subordinate = (Employee)
PropertyUtils.getIndexedProperty(employee, name);

Employee employee = ...;
int index = ...;
Employee subordinate = (Employee)
PropertyUtils.getIndexedProperty(employee, "subordinate", index);

Indexed支持2种写法，一种直接指定属性名以及Index，还有一种是把两这分别赋值，符号是方括号[]。

Mapped：

Employee employee = ...;
Address address = ...;
PropertyUtils.setMappedProperty(employee, "address(home)", address);

Employee employee = ...;
Address address = ...;
PropertyUtils.setMappedProperty(employee, "address", "home", address);

Mapped也支持2种写法，和Indexed不同的是他用的是Key，不是Index，符号是圆括号()。

同时它还支持属性的嵌套：

String city = employee.getAddress("home").getCity();

等价于

String city = (String)PropertyUtils.getNestedProperty(employee, "address(home).city");

以及以上情况的任意结合：

Employee employee = ...;
String city = (String) PropertyUtils.getProperty(employee,
"subordinate[3].address(home).city");

Dynamic Beans:最基本的接口是DynaBean和DynaClass。DynaBean负责生成动态的Bean，而DynaClass则是生成动态的Class。

BasicDynaBean和BasicDynaClass类

DynaProperty[] props = new DynaProperty[]{
new DynaProperty("address", Java.util.Map.class),
new DynaProperty("subordinate", mypackage.Employee[].class),
new DynaProperty("firstName", String.class),
new DynaProperty("lastName", String.class)
};
BasicDynaClass dynaClass = new BasicDynaClass("employee", null, props);

ResultSetDynaClass类

Connection conn = ...;
Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery
("select account_id, name from customers");
Iterator rows = (new ResultSetDynaClass(rs)).iterator();
while (rows.hasNext()) {
DynaBean row = (DynaBean) rows.next();
System.out.println("Account number is "
row.get("account_id")
" and name is " row.get("name"));
}
rs.close();
stmt.close();

但是ResultSetDynaClass是一定要在资源打开的情况下才能使用。

RowSetDynaClass 类

Connection conn = ...; // Acquire connection from pool
Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery("SELECT ...");
RowSetDynaClass rsdc = new RowSetDynaClass(rs);
rs.close();
stmt.close();
...; // Return connection to pool
List rows = rsdc.getRows();
...; // Process the rows as desired

RowSetDynaClass 就不象ResultSetDynaClass，需要都打开，但是他占用更多的内存。

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