jxpath 学习(f��n)�W�记

G_G — Mon, 13 Aug 2007 02:58:00 GMT

http://commons.apache.org/

�cȝ��加蝲

JXPathContext context = JXPathContext.newContext( obj );
//�?xpath �?范围���定

一般取�?存�? 
String fName = (String)context.getValue("firstName"); //setValue
//参�?http://www.tkk7.com/Good-Game/archive/2007/08/10/135739.html

一般的�l�计和���? c  �?list [id,name,.....]

        JXPathContext context = JXPathContext.newContext(c);
        System.out.println( context.getValue("count( .[name='oo' and id='1' ] )") ); //对象 name=oo �?id=1的有多少�?/font>
        System.out.println( context.getValue("sum( .[name='oo' and id='1' ]/id )") );//对象name=oo和id=1的所有id相加





得到集合
 Iterator threeBooks = context.iterate("books[position() < 4]");
//xpath 的位�|�函�?position 其他函数参�?http://www.w3.org/TR/xpath  
//4 Core Function Library

xpath 使用
public class Employee {
    private Map addressMap = new HashMap();
    {
        addressMap.put("home", new Address());
        addressMap.put("office", new Address());
    }
    public Map getAddresses(){
       return addressMap;
    }
    
 }
 String homeZipCode = (String)context. getValue("addresses[@name='home']/zipCode");
//使用的是 addressMap map �?key = home 的Address�c�d��性的 zipCode

xml 在程�?�?xpath 的切入点 
    xml version="1.0" ?>
    <vendor>
      <location id="store101">
        <address>
          <street>Orchard Roadstreet>
        address>
      location>

      <location id="store102">
        <address>
          <street>Tangerine Drivestreet>
        address>
      location>
    vendor>

class Company {
    private Container locations = null;

    public Container getLocations(){
        if (locations == null){
            URL url = getClass().getResource("Vendor.xml");
            locations = new XMLDocumentContainer(url);
        }
        return locations;
    }
 }
 
 context = JXPathContext.newContext(new Company());
 
 String street = (String)context.getValue(
                "locations/vendor/location[@id = 'store102']//street");
// �c�Container�?属�?locations �?vendor(xml�? .....

建立 Path工厂 ���是 自定义字�W�串 得到 自定义类
 public class AddressFactory extends AbstractFactory {
    public boolean createObject(JXPathContext context, Pointer pointer,
                                Object parent, String name, int index){
     if ((parent instanceof Employee) && name.equals("address"){
       ((Employee)parent).setAddress(new Address());
       return true;
     }
     return false;
   }
 }

 JXPathContext context = JXPathContext.newContext(emp);
 context.setFactory(new AddressFactory());
 context.createPath("address");
 context.createPathAndSetValue("address/zipCode", "90190");
// emp �c�d���?createObject�Ҏ(gu��)��中的 Object
//�q�行解析�?address字符 ���p���?if�?/font>

建立内参
 JXPathContext context = JXPathContext.newContext(auth);
 context.getVariables().declareVariable("index", new Integer(2));
 context.setValue("$index", new Integer(3));
 Book secondBook = (Book)context.getValue("books[$index]");
// $index �?3 

���定范围 Pointer  JXPathContext context = JXPathContext.newContext(bean);
 Pointer addressPtr = context.getPointer("/employees[1]/addresses[2]");
 JXPathContext relativeContext = 
              context.getRelativeContext(addressPtr);
 String zipCode = (String)relativeContext.getValue("zipCode");
//可以�?xpath ���定范围 很好 呵呵

�Ҏ(gu��)��的联�p�d���?br /> public class Formats {
    public static String date(Date d, String pattern){
        return new SimpleDateFormat(pattern).format(d);
    }
    
 }                                                     
 context.setFunctions(new ClassFunctions(Formats.class, "format"));
 //�Ҏ(gu��)��的设�|?format 
 
 context.getVariables().declareVariable("today", new Date());
 String today =
     (String)context.getValue("format:date($today, 'MM/dd/yyyy')");


�?j��)得�Q?代码可以写成什么样呢~~ (JXpath)

Jakarta Commons BeanUtils 学习(f��n)

G_G — Fri, 10 Aug 2007 02:36:00 GMT

参考：(x��)http://www.duduwolf.com/wiki/2007/296.html
      http://www.chinaitpower.com/A/2005-07-03/150232.html
1)普通的Bean处理不管是什么Set参数�?�?( 对象本��n, 属性名或属性内位置, �?) //list�?/font>add有点特别
                        Get参数�?�?span style="color: rgb(0, 0, 0);">( 对象本��n, 属性名或属性内位置 )

        Employee em = new Employee(); //String name; String[] ss; Map map; List list;
        BeanUtils.setProperty(em,"name","liukaiyi"); //String set
        BeanUtils.setProperty(em,"ss",new String[]{"1","2","3"}); //String[] set
           BeanUtils.setProperty(em,"ss[2]","google"); //String[2] set

        BeanUtils.setProperty(em,"map",new HashMap());   //Map set
            BeanUtils.setProperty(em,"map(key)","value"); //Map.put(Key,Value)

        BeanUtils.setProperty(em,"list",new ArrayList( Arrays.asList( new Object[20] ) )); //List有点特别
            BeanUtils.setProperty(em,"list[0]","list");       //不可以直接添加？�Q�？

        BeanUtils.setProperty(em,"avg","23");       //int set


        System.out.println( BeanUtils.getSimpleProperty(em,"name") );
        System.out.println( BeanUtils.getProperty(em,"ss[2]") );
        System.out.println( BeanUtils.getProperty(em,"map(key)") );

        System.out.println( BeanUtils.getProperty(em,"list[0].class") ); // 取的�?==list.get(0).getClass()

        System.out.println( BeanUtils.getProperty(em,"avg") );

2)动态属�?div style="border: 1px solid rgb(204, 204, 204); padding: 4px 5px 4px 4px; background-color: rgb(238, 238, 238); font-size: 13px; width: 98%;"> //定义动态属性集
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)
      };
//创徏动态类来设定动态属性�?/span>
    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");

//也可以同上一�?提供�l�一的Get Set �q�是字符操作 ^o^ 哈哈
         BeanUtils.setProperty(bean,"address",new HashMap());
             BeanUtils.setProperty(bean,"address(ads1)","江西");
        BeanUtils.setProperty(bean,"name","liu");
        BeanUtils.setProperty(bean,"subordinate",new String[3]);
             BeanUtils.setProperty(bean,"subordinate[1]","heha");
        System.out.println( BeanUtils.getProperty(bean,"address(ads1)") );
        System.out.println( BeanUtils.getProperty(bean,"name") );
        System.out.println( BeanUtils.getProperty(bean,"subordinate[1]") );

3�Q�JDBC 扩展

Connection conn = ;
    Statement stmt = conn.createStatement();
    ResultSet rs = stmt.executeQuery
    ("select accountid, name from customers");
    Iterator rows = (new ResultSetDynaClass(rs)).iterator(); //ResultSetDynaClass(java.sql.ResultSet resultSet)
    while (rows.hasNext()) {
//利用动态bean�q�行输出
    DynaBean row = (DynaBean) rows.next();   //�q�实体Bean都可以不要了(ji��n)
        BeanUtils.copyProperties( MyBean ,row ); // bean<--dynaBean ��p��样去得到�?^o^
          MyBean.getAccountid(); ....
    }
    rs.close();
    stmt.close();

4)HttpServletRequest 扩展

    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);//bean<--map struts好象是就用这�?Form

G_G 2007-08-10 10:36 发表评论

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jxpath 学习(f��n)�W�记

Jakarta Commons BeanUtils 学习(f��n)