Apache Commons BeanUtils

http://commons.apache.org/proper/commons-beanutils/javadocs/v1.9.2/apidocs/org/apache/commons/beanutils/package-summary.html#package_description

1. add maven 

<dependency>
<groupId>commons-beanutils</groupId>
<artifactId>commons-beanutils</artifactId>
<version>1.9.2</version>
<scope>compile</scope>
</dependency>

2. 參數賦值取值

• PropertyUtils.getSimpleProperty(Object, String)
• PropertyUtils.setSimpleProperty(Object, String, Object)
• PropertyUtils.getIndexedProperty(Object, String)
• PropertyUtils.getIndexedProperty(Object, String, int)
• PropertyUtils.setIndexedProperty(Object, String, Object)
• PropertyUtils.setIndexedProperty(Object, String, int, Object)
• PropertyUtils.getMappedProperty(Object, String)
• PropertyUtils.getMappedProperty(Object, String, String)
• PropertyUtils.setMappedProperty(Object, String, Object)
• PropertyUtils.setMappedProperty(Object, String, String, Object)

3. 嵌套賦值取值

• PropertyUtils.getNestedProperty(Object, String)
• PropertyUtils.setNestedProperty(Object, String, Object)

4.動態bean

  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);

DynaBean employee = dynaClass.newInstance();
     employee.set("address", new HashMap());
     employee.set("subordinate", new mypackage.Employee[0]);
     employee.set("firstName", "Fred");
     employee.set("lastName", "Flintstone");

MyBean bean = ...;
     DynaBean wrapper = new WrapDynaBean(bean);
     String firstName = wrapper.get("firstName");

LazyDynaBean 動態添加properties

5.類型轉換

HttpServletRequest request = ...;
     MyBean bean = ...;
     HashMap map = new HashMap();
     Enumeration names = request.getParameterNames();
     while (names.hasMoreElements()) {
       String name = (String) names.nextElement();
       map.put(name, request.getParameterValues(name));
     }
     BeanUtils.populate(bean, map);

BeanUtils.cloneBean(Object bean)

BeanUtils.copyProperties(Object dest, Object orig)

BeanUtils.copyProperty(Object bean, String name, Object value)

BeanUtils.setProperty(Object bean, String name, Object value)

BeanUtils.getProperty(Object bean, String name)

6. 集合
1. 比較 BeanComparator