鏈緇堝疄鐜扮殑鏁堟灉浠ｇ爜錛屽涓嬫墍紺猴細
<select>
<option selected="selected" value="Monitor">Monitor</option>
<option value="VCR">VCR</option>
<option value="Standard Device">Standard Device</option>
<option value="Smart Device">Smart Device</option>
<option value="Trunk">Trunk</option>
<option value="Standby VCR">Standby VCR</option>
</select>
2. enum浠ｇ爜
publicenum DeviceType {
@XmlEnumValue("Monitor")
MONITOR("Monitor"),
VCR("VCR"),
@XmlEnumValue("Standard Device")
STANDARD_DEVICE("Standard Device"),
@XmlEnumValue("Smart Device")
SMART_DEVICE("Smart Device"),
@XmlEnumValue("Trunk")
TRUNK("Trunk"),
@XmlEnumValue("Standby VCR")
STANDBY_VCR("Standby VCR");
privatefinal String value;
DeviceType(String v) {
value = v;
}
public String value() {
returnvalue;
}
publicstatic DeviceType fromValue(String v) {
for (DeviceType c: DeviceType.values()) {
if (c.value.equals(v)) {
return c;
}
}
thrownew IllegalArgumentException(v);
}
}
3. JSF鏍囩錛?/span>
<h:selectOneMenu value="#{voutputType.DEVICETYPE}" converter="voutputDeviceTypeConverter">
<f:selectItems value="#{voutput.deviceTypeList}"/>
</h:selectOneMenu>
涓昏鏈変笁涓儴鍒嗙粍鎴?/span>
(a) value="#{voutputType.DEVICETYPE}"
鐢?/span>javabean ,voutputType涓殑DEVICETYPE灞炴э紝紜畾html浠ｇ爜涓?/span><option selected="selected" value="Monitor">欏圭殑鍊?/span>銆?/span>
voutputType閰嶇疆淇℃伅鍦?/span>"WebRoot"WEB-INF"faces-config.xml錛?/span>
<managed-bean>
<managed-bean-name>voutputType</managed-bean-name>
<managed-bean-class>
cn.com.gentek.imatrix.xml.jaxb.voutput.ObjVOutputType
</managed-bean-class>
<managed-bean-scope>session</managed-bean-scope>
</managed-bean>
鍏朵腑DEVICETYPE灞炴у搴旂殑鍙橀噺鏄灇涓?/span>DeviceType鐨勪竴涓疄渚嬨?/span>
(b) converter="voutputDeviceTypeConverter"
綾誨瀷杞崲鍣紝鍦ㄥ湪"WebRoot"WEB-INF"faces-config.xml閰嶇疆濡備笅錛?/span>
<converter>
<converter-id>voutputDeviceTypeConverter</converter-id>
<converter-class>
cn.com.gentek.imatrix.ui.VoutDeviceTypeConverter
</converter-class>
</converter>
cn.com.gentek.imatrix.ui.VoutDeviceTypeConverter浠ｇ爜濡備笅錛?/span>
錛堝疄鐜?/span>< select>涓?/span><option>鐨?/span>String綾誨瀷鍊鹼紝涓?/span>DeviceType綾誨瀷涔嬮棿鐨勮漿鎹級
publicclass VoutDeviceTypeConverter implements Converter {
public Object getAsObject(FacesContext context, UIComponent component, String value) {
DeviceType result = null;
if (value == null || value.length() < 1) {
result = null;
} else
result = DeviceType.fromValue(value);
returnresult;
}
public String getAsString(FacesContext context, UIComponent component, Object value) {
String result = null;
if (value != null) {
if (value instanceof DeviceType) {
DeviceType temp = (DeviceType) value;
result = temp.value();
}
}
return result;
}
}
(c) <f:selectItems value="#{voutput.deviceTypeList}"/>錛堥噸鐐癸級
鐢變簬deviceTypeList瀵瑰簲鍙橀噺蹇呴』鏄?/span>SelectItem錛?/span>javax.faces.model.SelectItem錛夊垪琛紝鎵浠ユ湁蹇呰灝?/span>DeviceType綾誨瀷瀹炰緥鐨勫煎拰瀵瑰簲String綾誨瀷鍊鹼紝灝佽鍦ㄤ竴涓?/span>SelectItem瀹炰緥涓傚疄鐜頒唬鐮佸涓嬶細
ArrayList<SelectItem> deviceTypeList = new ArrayList<SelectItem>();
for (int i = 0; i < DeviceType.values().length; i++) {
deviceTypeList.add(new SelectItem(DeviceType.values()[i],
DeviceType.values()[i].value()));
}
]]>
涓嬮潰閫氳繃瀹炰緥鏉ヨ鏄庛?/span>
棣栧厛鏄粙緇?/span>web紼嬪簭鐩綍鐨勫ぇ鑷寸粨鏋勶細
D:"......"Tomcat 6.0"webapps"imatrixb ------> 紼嬪簭鐨勬洿鐩綍
--META-INF
--WEB-INF
---------------classess
---------------------------cn
----------------------------------com
--------------------------------------------…… ----------->class 鏂囦歡
---------------------------XmlData
---------------------------------path-config.xml 錛?/span>1錛?/span>
--------------- path-config.xml 錛?/span>2錛?/span>
…….
Index.jsp
涓錛?/span>FacesContext
鑾峰緱錛?/span>2錛夊彿path-config.xml鏂囦歡淇℃伅,
浠ｇ爜濡備笅錛?/span>
String partPath=”/ WEB-INF/ path-config.xml”;
1. getRealPath():
FacesContext
context = FacesContext.getCurrentInstance();
HttpServletRequest rst = (HttpServletRequest)context.getExternalContext().getRequest();
String fullPath=rst.getRealPath(xmlfile); // 鑾峰緱xml鏂囦歡鐨勭郴緇熻礬寰勶紝xmlfile涓虹浉瀵硅礬寰?/span>
閲囩敤榪欎釜鏂規硶瀛樺湪涓浜涢殣鎮ｏ細姣旀柟璇村涓涓墦鍖呯殑搴旂敤鏉ヨ錛屾槸娌℃湁RealPath鐨勬蹇電殑錛岃皟鐢?/span>getRealPath鍙細綆鍗曞湴榪斿洖null銆?/span>
2. getResourceAsStream():
FacesContext context = FacesContext.getCurrentInstance();
InputStream xmlStream = context.getExternalContext()
.getResourceAsStream(xmlfile);
鐢ㄤ簬鍙鐨勫艦寮忋?/span>
浜岋細ClassLoader
鑾峰緱錛?/span>1錛夊彿path-config.xml鏂囦歡淇℃伅,
浠ｇ爜濡備笅錛?/span>
String partPath =”/XmlData/path-config.xml”;
String fullPath=this.getClass().getClassLoader().getResource(partPath).getPath();
//浣跨敤鐨勬椂鍊欒繕鏄瓨鍦ㄤ竴浜涢棶棰橈紝鏃犳硶姝ｅ父浣跨敤錛屾殏鏃舵病鏈夊彂鐜拌В鍐崇殑鍔炴硶
InputStream xmlStream=this.getClass().getClassLoader().getResourceAsStream(partPath);
//鐢ㄤ簬鍙鐨勫艦寮忎笅錛岄氳繃嫻嬭瘯鑳藉姝ｅ父鐨勪嬌鐢?/span>
]]>
1.2.1 瀛︿範絎旇
鍙傝冭祫鏂欙細Java 2 鏍稿績鎶鏈?/span>鍗?/span>I錛氬熀紜鐭ヨ瘑錛堢7鐗堬級 5.5 鍙嶅皠
(1) Class綾?/span>
鍦ㄧ▼搴忚繍琛屾湡闂達紝Java榪愯鏃剁郴緇熷緇堜負鎵鏈夊璞＄殑緇存姢涓涓縐頒負榪愯鏃剁殑綾誨瀷鏍囪瘑銆傝繖涓俊鎭繚瀛樼潃姣忎竴涓璞℃墍鏈夊睘鎬х殑綾昏凍榪廣傝櫄鎷熸満鍒╃敤榪愯淇℃伅閫夋嫨鐩稿簲鐨勬柟娉曟墽琛屻?/span>
鑾峰彇Class綾誨璞＄殑涓夌鏂規硶
(a) getClass()
Employee e;
…
Class cl=e.getClass();
System.out.println(cl.getName()+“ ” +e.getName());
Result:
Employee Harry
(b) forName()
String className= “java.util.Date ”;
Class cl=Class.forName(className);
(c) .class
Class cl1=Date.class;
Class cl2=int.class;
(2) 鍙嶅皠鐨勫垎鏋愯兘鍔?/span>
紺轟緥錛?/span>
Employee.java:
publicclass Employee {
private String name;
privateintage;
public String getName() {
returnname;
}
publicvoid setName(String name) {
this.name = name;
}
publicint getSalary() {
returnage;
}
publicvoid setSalary(int salary) {
this.age = salary;
}
public Employee(String name, int salary) {
this.name = name;
this.age = salary;
}
}
Test.java
import java.lang.reflect.Field;
publicclass test {
publicstaticvoid main(String[] args) throws SecurityException,
NoSuchFieldException, IllegalArgumentException,
IllegalAccessException {
Employee zhanjh = new Employee("zhan jh", 1000);
Class<?> cl = zhanjh.getClass();
Field f = cl.getDeclaredField("name"); // 榪斿洖鍚嶇О涓?/span>“name”鐨勭鏈夋垨鍏湁鎴愬憳錛堝煙錛?/span>
f.setAccessible(true); // 闈炲父閲嶈錛屽惁鍒欐棤娉曡皟鐢?/span>f.get(zhanjh)鏂規硶
Object v = f.get(zhanjh);// 榪斿洖zhanjh瀵硅薄涓?/span> name鎴愬憳錛堝煙錛夌殑鍊?/span>
System.out.println(v.toString());
}
}
/*
* 榪愯緇撴灉錛?/span> zhan jh
*/
]]>
]]>
涓婂崍瀹屾垚thinking Java涓叧浜嶪nterfaces绔犺妭鐨勫唴瀹廣備笅闈㈡槸璇ョ珷鑺備腑鍏充簬"Interfaces and factories"鐨勪緥瀛?br /> package com.zhanjh.thinkingjava.interfaces;
interface Service{
void method1();
void method2();
}
interface ServiceFactory{
Service getService();
}
class Implementation1 implements Service{
public Implementation1() {
// TODO Auto-generated constructor stub
}
public void method1(){
System.out.println("Implementation1 method1");
}
public void method2(){
System.out.println("Implementation1 method2");
}
}
class Implementation1Factory implements ServiceFactory{
public Service getService(){
return new Implementation1();
}
}
class Implementation2 implements Service{
public Implementation2() {
// TODO Auto-generated constructor stub
}
public void method1(){
System.out.println("Implementation2 method1");
}
public void method2(){
System.out.println("Implementation2 method2");
}
}
class Implementation2Factory implements ServiceFactory{
public Service getService(){
return new Implementation2();
}
}
public class Factories{
public static void serviceConsumer(ServiceFactory fact){
Service s=fact.getService();
s.method1();
s.method2();
}
public static void main(String[] args){
serviceConsumer(new Implementation1Factory());
serviceConsumer(new Implementation2Factory());
}
}
鎬葷粨錛歛bstract class鍜宨nterface鏄疛ava璇█涓浜庢娊璞＄被瀹氫箟榪涜鏀寔鐨勪袱縐嶆満鍒訛紝abstract class鍜宨nterface涔嬮棿鍦ㄥ浜庢娊璞＄被瀹氫箟鐨勬敮鎸佹柟闈㈠叿鏈夊緢澶х殑鐩鎬技鎬с傜洰鍓嶆垜瀵逛粬浠尯鍒嗙殑鏂規硶澶ц嚧濡備笅錛?br /> 1錛塱nterface鍙互澶氶噸瀹炵幇錛岃宎bstract class鍙兘鍗曚竴緇ф壙
2錛塧bstract class涓嶄竴瀹氬彧鏈夋娊璞＄殑鏂規硶錛坅bstract method錛夛紝瀹冧篃鍙互鍖呭惈鍏蜂綋鐨勬柟娉曪紙concrete method錛夈傝宨nterface涓嶈兘鍖呭惈鏂規硶鐨勫疄鐜幫紙implementation錛夈傛墍浠ュ湪紼嬪簭璁捐鐨勬椂鍊欙紝鑳界敤inteface鐨勬椂鍊欏敖閲忎笉瑕佺敤abstract class銆?br />
涓嬪崍
鏌ユ壘鍏充簬EJB鐨勮祫鏂欙紝娌″ご緇?br /> jaxb鍏ラ棬瀛︿範銆?br /> xjc錛堝皢xsd鏂囦歡杞崲涓篔ava鐨勫皬宸ュ叿錛夊伐鍏風殑浣跨敤銆傚彲浠ュ垱寤轟竴涓猙at鏂囦歡澶勭悊涓嬮潰鐨勫懡浠わ細
xjc -d "D:"eclipse"workspace"JaxbTest"src" -p "edu.jlu.xml" "D:"eclipse"workspace"JaxbTest"schema"messages.xsd"
鍏朵腑D:"eclipse"workspace"JaxbTest"src涓哄師鏂囦歡鐨勭洰褰曪紝edu.jlu.xml涓虹敓鎴怞ava綾葷殑鍖呭悕錛孌:" eclipse"workspace"JaxbTest"schema"messages.xsd涓簒ml schema鏂囦歡鐨勮礬寰勩?br />
]]>