Java反射中java.beans包学习总结

public class NodeDO {
	private String name;
	private String email;
	private Date date;
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getEmail() {
		return email;
	}
	public void setEmail(String email) {
		this.email = email;
	}
	public Date getDate() {
		return date;
	}
	public void setDate(Date date) {
		this.date = date;
	}
	@Override
	public String toString() {
		return "NodeDO [name=" + name + ", email=" + email + ", date=" + DodeDOEditor.sdf.format(date) + "]";
	}
}

public class TestDO { 
  private String nodeName; 
  private NodeDO nodeDO; 
  public String getNodeName() { 
    return nodeName; 
  } 
  public void setNodeName(String nodeName) { 
    this.nodeName = nodeName; 
  } 
  public NodeDO getNodeDO() { 
    return nodeDO; 
  } 
  public void setNodeDO(NodeDO nodeDO) { 
    this.nodeDO = nodeDO; 
  } 
}

public static void main(String[] args) throws Exception{ 
    Map<String, String> parameters = new HashMap<String, String>(){ 
      { 
        put("nodeName", "小胖测试"); 
        put("nodeDO", "xiaopang|xiaopang@163.com|2015-10-20 12:00:00"); 
      } 
    };  
    TestDO testDo = convert(parameters); 
    System.out.println(testDo.getNodeName()); 
    System.out.println(testDo.getNodeDO()); 
  }

public class DodeDOEditor extends PropertyEditorSupport{ 
   
  public static final SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); 
   
  @Override 
  public void setAsText(String text) throws IllegalArgumentException{ 
    String[] tokens = text.split("\\|"); 
    NodeDO nodeDo = new NodeDO(); 
    nodeDo.setName(tokens[0]); 
    nodeDo.setEmail(tokens[1]); 
    try{ 
      nodeDo.setDate(sdf.parse(tokens[2])); 
    }catch(ParseException e){ 
      throw new IllegalArgumentException(e); 
    } 
    setValue(nodeDo); 
  } 
} 

public class PropertyEditorSample { 
 
  static{ 
    PropertyEditorManager.registerEditor(NodeDO.class, DodeDOEditor.class); 
  } 
   
  public static void main(String[] args) throws Exception{ 
    Map<String, String> parameters = new HashMap<String, String>(){ 
      { 
        put("nodeName", "小胖测试"); 
        put("nodeDO", "xiaopang|xiaopang@163.com|2015-10-20 12:00:00"); 
      } 
    };  
    TestDO testDo = convert(parameters); 
    System.out.println(testDo.getNodeName()); 
    System.out.println(testDo.getNodeDO()); 
  } 
 
  private static TestDO convert(Map<String, String> parameters)throws Exception { 
    TestDO testDO = new TestDO(); 
    BeanInfo bi = Introspector.getBeanInfo(TestDO.class);  
    PropertyDescriptor[] pds = bi.getPropertyDescriptors();  
    for(PropertyDescriptor pd : pds){ 
      Class<?> propertyType = pd.getPropertyType(); 
      Method writeMethod = pd.getWriteMethod(); 
      if(propertyType == Class.class){ 
        //ignore 
      }else if(propertyType == String.class){ 
        writeMethod.invoke(testDO, parameters.get(pd.getName())); 
      }else{ 
        PropertyEditor editor = PropertyEditorManager.findEditor(propertyType); 
        if(editor != null){ 
          editor.setAsText(parameters.get(pd.getName())); 
          writeMethod.invoke(testDO, editor.getValue()); 
        }else{ 
          System.out.println("no editor for:"+pd.getName()); 
        } 
      } 
    } 
    return testDO; 
  } 
 
}

<pre name="code" class="java">editor.setAsText(parameters.get(pd.getName()));//1 
editor.getValue();//2 
//因此，一般都会在setAsText中去调用setValue()来保存转化以后的值，这样通过getValue()就能获取到了