国产av无码专区亚洲av桃花庵 ,久久亚洲私人国产精品vA,国产成人精品日本亚洲专区61

待整理的东东

Sat, 12 Apr 2008 15:07:00 GMT

JAVA中HashMap的成员遍�?nbsp;
�Ҏ��一�Q?nbsp;
        Set   entries;
        entries=map.keySet();
        Iterator   iter=entries.iterator();
        while(iter.hasNext()){
              Object   obj=iter.next();
              System.out.println(obj+":"+map.get(obj));
        }

    �Ҏ��二：
        Set   entries;
        entries=map.entrySet();
        Iterator   iter=entries.iterator();
        while(iter.hasNext())
        {
              System.out.println(iter.next()+"   ");
        }

另外�Q�JAVA�?interface和class都可以作为对变量的声明�?br />

    public static void copyDirtoDest(String srcDir, String toDir) {
        Copy copyDir = new Copy();
        copyDir.setOverwrite(true);
        copyDir.setProject(new Project());
        FileSet fileSet = new FileSet();
        fileSet.setDir(new File(srcDir));
        copyDir.addFileset(fileSet);
        File dest = new File(toDir);

        copyDir.setTodir(dest);
        copyDir.execute();
    }

    public static void copyFiletoDestDir(String srcFile, String destDir) {
        Copy copy = new Copy();
        copy.setProject(new Project());
        copy.setFile(new File(srcFile));
        copy.setTodir(new File(destDir));
        copy.execute();
    }

    public static void makeDir(String dir) {
        Mkdir mkdir = new Mkdir();
        mkdir.setProject(new Project());
        mkdir.setDir(new File(dir));
        mkdir.execute();
    }

    public static void copyFiletoDestandRename(String srcFile, String destFile) {
        Copy copyTask = new Copy();
        copyTask.setProject(new Project());
        copyTask.setFile(new File(srcFile));
        copyTask.setTofile(new File(destFile));
        copyTask.execute();
    }

    public static void moveFiletoDest(String srcFile, String destDir) {
        Move move = new Move();
        move.setProject(new Project());
        move.setFile(new File(srcFile));
        move.setTodir(new File(destDir));
        move.execute();
    }

验证文�g夹名�U�是否符合java包名规范

//弱验证（只要能被java支持的名�U�ͼ�如中文名�U�ͼ�
IStatus val = JavaConventions.validatePackageName(folder);
if (val.getSeverity() == IStatus.ERROR) {
     return false;
}
/**
     * 强验证：是否是严格符合命名规范的包名�Q�标识：以字母开��_��字母与数字的�l�合�Q�字母必��都是小写�?br />      * @param str1
     * @return
     */
    public static boolean isPackageName(String str1){
        String regex = "^[a-z][a-z[\\d]]*";
        Pattern p = Pattern.compile(regex);
        Matcher m = p.matcher(str1);
        return  m.matches();
    }

子非�?/a> 2008-04-12 23:07 发表评论

JAVA奇技淫��y

Thu, 24 Jan 2008 03:30:00 GMT

内部�c�调用外部类对象�Q��{�Q?/span>
内部�c�d��以��用外部类�?this引用外部�cȝ��当前对象,然后��可以��用外部类的�Q何属性和�Ҏ��?nbsp;

  class   OuterClass{
  public   void   show()   {
        System.out.println("method   of  out   class");
  }
  class   InnerClass{
  public   void   showStr(){
  OuterClass.this.show()
  }
  }

String[] strs = str.split(",");

web.xml中配�|�tag-lib间接引用

<%@ taglib uri="http://www.ccb.cn/xmdc" prefix="xmdc"%>

在web.xml中增加下面的内容�Q?/span>

  <taglib>
    <taglib-uri>http://www.ccb.cn/xmdctaglib-uri>
    <taglib-location>/WEB-INF/xmdc.tldtaglib-location>
  taglib>

子非�?/a> 2008-01-24 11:30 发表评论

copyProperties�Ҏ��分析(�?

Thu, 25 Oct 2007 02:16:00 GMT

BeanUtils和PropertyUtils�c�L��许多开源框架中频繁使用的两个工��P��它们都能实现��一个类中的属性拷贝到另一个类中，�q�个功能甚至是spring实现依赖注入的基��。研�I�一下apache的comon包中如何实现�q�个两个工具�Q�可以发现它们都是��用java.lang.reflect和java.beans�q�两个包下的几个�c�L��实现的�?

�q�里我们通过�~�写一个将一个类的所有属性拷贝到另一个类的相应属性的�Ҏ��来分析是如何实现拯��功能�?先把�Ҏ��放上来：

/** 实现��源�c�d��性拷贝到目标�c�M��
   * @param source
   * @param target
   */
public static void copyProperties(Object source, Object target) {
   try {
        //获取目标�cȝ��属性信�?/span>
        BeanInfo targetbean = Introspector.getBeanInfo(target.getClass());
        PropertyDescriptor[] propertyDescriptors = targetbean.getPropertyDescriptors();
        //�Ҏ��个目标类的属性查找set�Ҏ��Q��ƈ�q�行处理
        for (int i = 0; i < propertyDescriptors.length; i++) {
             PropertyDescriptor pro = propertyDescriptors[i];
             Method wm = pro.getWriteMethod();
             if (wm != null) {//当目标类的属性具有set�Ҏ��Ӟ��查找源类中是否有相同属性的get�Ҏ��
                 BeanInfo sourceBean = Introspector.getBeanInfo(source.getClass());
                 PropertyDescriptor[] sourcepds = sourceBean.getPropertyDescriptors();
                 for (int j = 0; j < sourcepds.length; j++) {
                      if (sourcepds[j].getName().equals(pro.getName())) { //匚w��
                           Method rm = sourcepds[j].getReadMethod();
                           //如果�Ҏ��不可讉K��(get�Ҏ��是私有的或不可达),则抛出SecurityException
                           if (!Modifier.isPublic(rm.getDeclaringClass().getModifiers())) {
                                rm.setAccessible(true);
                           }
                          //获取对应属性get所得到的�?/span>
                          Object value = rm.invoke(source,new Object[0]);
                          if (!Modifier.isPublic(wm.getDeclaringClass().getModifiers())) {
                               wm.setAccessible(true);
                          }
                          //调用目标�c�d��应属性的set�Ҏ��对该属性进行填�?/span>
                          wm.invoke((Object) target, new Object[] { value });
                          break;
                      }
                 }
              }
          }
   } catch (IntrospectionException e) {
       e.printStackTrace();
   } catch (IllegalArgumentException e) {
       e.printStackTrace();
   } catch (IllegalAccessException e) {
       e.printStackTrace();
  } catch (InvocationTargetException e) {
      e.printStackTrace();
  }
}

两个工具的其他方法实现虽然有点差�?但原理都跟上面的例子差不�?有兴��的话可以写个测试类试试是否可以使用.

转自�Q?http://lemonfamily.blogdriver.com/lemonfamily/1240784.html

子非�?/a> 2007-10-25 10:16 发表评论

Sat, 25 Aug 2007 14:58:00 GMT

http://blogger.org.cn/blog/blog.asp?name=hongrui --邢红�?/font> JAVA
http://macrochen.blogdriver.com/macrochen/1108553.html --疯狂的菠�?/span> JAVA �{?br /> http://blog.csdn.net/mingjava/category/13936.aspx --JAVA

http://m.tkk7.com/wadise/category/6079.html --eclipse代码生成器插件开�?/a>

子非�?/a> 2007-08-25 22:58 发表评论

Tue, 07 Aug 2007 10:20:00 GMT

public class NodeNameComparator  implements Comparator
{

    RuleBasedCollator collator;

    private NodeNameComparator(){
        collator = (RuleBasedCollator)Collator.getInstance(java.util.Locale.CHINA);// 讄��规则��Z��文字�W�比�?/span>
    }

    private static NodeNameComparator instance = new NodeNameComparator();

    public static NodeNameComparator getInstance() {
        return instance;
    }

    public int compare(Object obj1, Object obj2) {
        String name1 = "大牛";
        String name2 = "��牛";

        CollationKey c1 = collator.getCollationKey(name1);
        CollationKey c2 = collator.getCollationKey(name2);
        return collator.compare(((CollationKey) c1).getSourceString(),
                ((CollationKey) c2).getSourceString());
    }

}

英文情况�Q?/span>

return string1.compareTo(string);

子非�?/a> 2007-08-07 18:20 发表评论

对象拯��

Wed, 25 Jul 2007 08:51:00 GMT

1/**
2 * 部分�cȝ��copy�Ҏ��实现
3 *
4 */
5public class CopyFactoryImpl implements CopyFactory{
6
7    public Object copy(Object from){
8        if(from != null){
9//            if(from instanceof Params)
10//                return copyParams((Params)from);
11//            if(from instanceof Value)
12//                return copyValue((Value)from);
13//            if(from instanceof OvertimePolicies)
14//                return copyPolicies((OvertimePolicies)from);
15//            if(from instanceof Event)
16//                return copyEvent((Event)from);
17
18            return copyObject(from);//from应Serialization
19
20        }
21
22        return null;
23    }
24
25
26    /**
27     * �~�存复制方式拯��
28     * @param from
29     * @return
30     */
31    public Object copyObject(Object from){
32       try{
33          // 在内存中开辟一块缓冲区�Q�用于将源对象写�?/span>
34          ByteArrayOutputStream bout = new ByteArrayOutputStream();
35          ObjectOutputStream out = new ObjectOutputStream(bout);
36          //通过Serialization机制��自�w�写入该�~�冲�?/span>
37          out.writeObject(from);
38          out.close();
39
40          // 扑ֈ�刚才开辟的�~�冲区准备读�?/span>
41          ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
42          ObjectInputStream in = new ObjectInputStream(bin);
43          //��刚才写入的内容��d��目标对象
44          Object target = in.readObject();
45          in.close();
46
47          //�q�回目标对象�Q�拷贝完�?/span>
48          return target;
49       }catch (Exception e){
50          return null;
51       }
52    }
53}

子非�?/a> 2007-07-25 16:51 发表评论

国产av无码专区亚洲av桃花庵 ,久久亚洲私人国产精品vA,国产成人精品日本亚洲专区61

待整理的东东

JAVA奇技淫��y

copyProperties�Ҏ��分析(�?

对象拯���

对象拯��