2016Java⼯
javaıYJBYSСΪҾѼ˹2016JavaļӭҲοϣ!
1.MVCĸֶЩʵ?ʵ?
MVCModel-View-Controllerļд"Model" Ӧõҵ(ͨJavaBeanEJBʵ) "View"Ӧõıʾ(JSPҳ)"Controller" ṩӦõĴ̿(һһServlet)ͨģͰӦ̺ʾֳɲͬʵ֡ЩԽнá
2.J2EEʲô?
Je22Sun˾Ķ(multi-diered)ֲʽ(distributed)(component-base)ҵӦģ(enterpriese application model).һӦϵͳУɰչܻΪͬЩֿڲͬϣҴӦIJ(tier)Сΰͻ(clietn tier)webBusinessҵϢϵͳ(EIS)㡣
3.J2EEǼƽ̨ǿ?
J2EEһһΪҵֲʽӦõĿṩıƽ̨
J2EEҲһܣJDBCJNDIRMIJMSEJBJTAȼ
4.STRUTSӦ(STRUTSܹ)
StrutsDzJava Servlet/JavaServer PagesWebӦóĿԴframework StrutsܿMVC(Model-View-Controller)ģʽӦùܡ StrutsµҪܣ
һ.һcontroller servletܽû͵ӦAction
.JSPtag⣬controller servletṩ֧֣ԱʽӦá
.ṩһϵʵöXMLͨJava reflection APIsԶJavaBeansԡʻʾϢ
5.WEB SERVICEʽ͡JSWDLĽܡJAXPJAXMĽ͡SOAPUDDIWSDL͡
Web ServiceWeb Serviceǻġֲʽģ黯ִضؾļ淶Щ淶ʹWeb Serviceݵл
JAXP(Java API for XML Parsing) JavaʹDOM SAX XSLTͨõĽӿڡijֻҪʹЩͨõĽӿڣҪıʵʱҲҪĴ롣
JAXM(Java API for XML Messaging) ΪSOAPͨṩʷʹƵAPI
WSDLһ XML ʽڽΪһ˵㣬Щ˵ĵϢϢϢвָʽȶԲϢгȻЭϢʽԶ˵㡣صľ˵㼴ϳΪ˵()
SOAPЭ(Simple Object Access Protocol)ڽXMLϢЭ顣
UDDI ĿΪ;UDDIһWebġֲʽġΪWeb ServiceṩġϢעĵʵֱ淶ͬʱҲһʹҵܽṩWeb ServiceעᣬʹҵֵܹķЭʵֱ
6.C/S B/S
°˸IJͬ
(1)Ӳͬ:
C/S һ㽨רõϣ СΧ绷 ֮ͨרŷṩӺݽ.
B/S ڹ֮ϵģ רŵӲ绰 豸. ϢԼ. бC/SǿӦΧ һֻҪвϵͳ
(2)ȫҪͬ
C/S һԹ̶ûȺ ϢȫĿǿ. һ߶ȻܵϢϵͳC/S ṹ. ͨB/SֿɹϢ.
B/S ڹ֮ϣ ȫĿ ֪û
(3)Գܹͬ
C/S Ըע̣ ԶȨУ飬 ϵͳٶȿԽٿ.
B/S ȫԼٶȵĶصĿǣ ҪŻĻ֮. C/SиߵҪ B/SṹijܹǷչƣ MS.NetϵеBizTalk 2000 Exchange 2000ȣ ȫ֧Ĺϵͳ. SUN IBMƵJavaBean ȣʹ B/Sӳ.
(4)òͬ
C/S ԲɱԿǣ ԲB/SҪµĹԺ.
B/S ԵĶؽṹҪԶĹ. ܹԽϺõ.IJãǽϵʯͷ
(5)ϵͳάͬ
C/S ԣ 忼죬 ֵԼϵͳ. . һȫµϵͳ
B/S ɣ湹ĸʵϵͳ. ϵͳάС.ûԼذװͿʵ.
(6)ⲻͬ
C/S Դû̶ ͬ ȫҪ ϵͳ. Ӧöͬϵͳ
B/S ڹϣ ͬûȺ ɢ C/S. ϵͳƽ̨ϵС.
(7)ûӿڲͬ
C/S ǽWindowƽ̨ϣַޣԳԱձҪϸ
B/S ϣ иӷḻıַʽû. ҴѶȼͣͿɱ.
(8)Ϣͬ
C/S һǵ͵뼯ȨĻеʽ Ե
B/S Ϣɱ仯 B-B B-C B-GϢı仯 ġ
7.ʲôJNDI
(Java Naming & Directory Interface)JAVAĿ¼ҪṩĹǣṩһĿ¼ϵͳصӦóԼӶٲҺͶλֲʽӦóĹܡ
8.ʲôJMS
(Java Message Service)JAVAϢҪʵָӦó֮ͨѶԵ㲥
9.ʲôJTA
(Java Transaction API)JAVAṩֲַʽӦóֻṩĽӿڼɡ
10.жõЩģʽ?ʲô?
ÿģʽһǵĻвϳֵ⣬Ȼ˸ĽĺġַͨʽεʹЩеĽظͬĹҪõMVCģʽJSP/ServletJ2EEӦáģʽȡ
11.j2eeõģʽ?˵ģʽ
Javaе23ģʽ
Factory(ģʽ) Builder(ģʽ) Factory Method(ģʽ)
Prototype(ԭʼģģʽ)Singleton(ģʽ) Facade(ģʽ)
Adapter(ģʽ) Bridge(ģʽ) Composite(ϳģʽ)
Decorator(װģʽ) Flyweight(Ԫģʽ) Proxy(ģʽ)
Command(ģʽ) Interpreter(ģʽ) Visitor(ģʽ)
Iterator(ģʽ) Mediator(ͣģʽ) Memento(¼ģʽ)
Observer(۲ģʽ) State(״̬ģʽ) Strategy(ģʽ)
Template Method(ģ巽ģʽ) Chain Of Responsibleity(ģʽ)
ģʽģʽһ־ʹõģʽݹģʽʵֵԸṩһijһʵͨһһijಢʵͬķЩԲͬݽ˲ͬIJҪһ࣬ͨͬķʵ˻еķȻҪһ࣬ԸɲͬʵõʵԱԵûеķؿǵصһʵ
12.UML
𣺱ģUMLͼ̬ͼ(ͼͼͰͼ)Ϊͼͼ(˳ͼͼ)ʵͼ
13.RMI
RMI ָԶ̷ (Remote Method Invocation)һֻƣܹij Java ϵĶһJava еĶϵķô˷õκζʵָԶ̽ӿڡһʱΪ"marshalled" ӱ͵Զ(ԶIJΪ "unmarshalled")ϡ÷ֹʱԶ̻Ľ͵÷õ׳쳣쳣ָʾ÷
JAVA
1.λij?
.length
2.η“public/private/protected/ȱʡη”ʹ?
public : ɷ
private: ˽еģͬһjavaпԷ.ܷ.
protected: ͬһеɷ.Է.
ȱʡfriendly :ǰ࣬ͬһԷ.
ǰ ͬһpackage package
public √ √ √ √
protected √ √ √ ×
friendly √ √ × ×
private √ × × ×
3.Anonymous Inner Class (ڲ) Ƿextends(̳)࣬Ƿimplements(ʵ)interface(ӿ)?
ڲûֵڲܼ̳࣬࣬һڲΪһӿڣһڲʵ.
һڲû֣ûй캯Ϊûй캯ȫøĹ캯ʵ֮ڲȫѴ˸ȥɡ
ڲﴴµķû̫壬ͨǸķﵽЧʾǶ̬Ե֡
Ϊڲû֣µǿתжһڲõıһֱӻӸ͡
new <ӿ> <>
DzƵ࣬û취ǡڴʱΪnewһǡ
Ҫһʽnew䣬ʾ
new <ӿ> <>
ʽnewһµ࣬һչʵһĽӿڡǸһʵΪĽءҪչҪʵֵĽӿnewIJ塣
һչԷijԱķȵȣκαһġʵһӿڣʵֽӿڵķ
עڱʱеģʵʱСζforѭеһnewᴴͬļʵǴͬһʵ
Ӽ˵ɱΪǾ̬ڲ࣬ǾкͷڲķǾ̬ڲһȨơ
ҪִеҪһȴֵôȫµĶ(ԭڼֻһڲʹ)Ե÷dzáʺSwingӦóпٴ¼
exp:
return new Contents() {
private int i = 11;
public int value() { return i; }
};
ֵҪ˼ǣ“Contentsһ”newʽصľԶͳһContentsڲʵҪǣ
class MyContents extends Contents {
private int i = 11;
public int value() { return i; }
}
return new MyContents();
ͼڲ࣬ʹڲⲿһҪⲿfinal.
public class Parcel9 {
public Destination
dest(final String dest final float price) {
return new Destination() {
private int cost;
// Instance initialization for each object:
{
cost = Math.round(price);
if(cost > 100)
System.out.println("Over budget!");
}
private String label = dest;
public String readLabel() { return label; }
};
}
public static void main(String[] args) {
Parcel9 p = new Parcel9();
Destination d = p.dest("Tanzania" 101.395F);
}
}
4.static nested class inner classIJͬ?
nested classc++Ƕ࣬inner classjavaڲ.ͬǷָⲿ`.̬ڲζŴһstaticڲĶҪһⲿ;ܴһstaticڲһʵһⲿĶ.
5.&&&
&λʾλ;&&ʾ(and)
6.CollectionCollections
collectionǼϼӿڣ̳ĽӿҪsetlist
listض˳Ԫ;һsetܰظԪ.
ӳ(Map)һϵ"-ֵ".ԷԼһsetһԼֵlist߰Լ(-ֵ)Եһlist.
ɹԼķ.
collectionsԼһ.ṩһϵеľ̬Ըּϵ̰߳ȫȲ.
public class SimpleCollection {
public static void main(String[] args) {
Collection c = new ArrayList();
for(int i = 0; i < 10; i++)
c.add(Integer.toString(i));
Iterator it = c.iterator();
while(it.hasNext())
System.out.println(it.next());
}
}
7.ʲôʱassert
assertion()һֳõĵԷʽܶжֻ֧ơʵУassertionڳеһ䣬һbooleanʽм飬һȷ뱣֤booleanʽֵΪtrue;ֵΪfalse˵Ѿڲȷ״̬£ϵͳ˳һ˵assertionڱ֤ؼȷԡassertionͨڿͲʱΪܣassertionͨǹرյ.
8.String s = new String("xyz");˼String Object***
һַһַö
9.math.round(11.5)math.round(-11.5)
ǰߵ12ߵ-11.roundӽij.0.5floor
10. short s1 = 1;s1 = s1+1;Ƿд? short s1 = 1;s1 += 1;Ƿд?
ǰs1+1һintͣҪǿת.
ȷ.
11.javaûgoto?
УΪ.δʹ.
12.OverloadOverrideOverloadedķǷԸı䷵ֵ?
javaĿ ⼰ 2014±Ŀ 2015ͨˮƽ java
Java⼯ 2015УƸJAVA JAVAԱ⼰() Javascript֮AJAXĻ֪ʶĿ
10JavaԱ⼯ 2014֧JAVA ¹IBM Javaı⸽
𣺷дOverridingOverloadingJava̬ԵIJͬ֡дOverridingǸ̬֮Եһֱ֣Overloadingһж̬Եһֱ֡жij丸ͬƺͲ˵÷д (Overriding)ĶʹʱеĶ壬ԣеĶͬ""ˡһж˶ͬķǻвͬIJвͬIJͣΪ(Overloading)OverloadedķǿԸı䷵ֵ
13.SetԪDzظģôʲôظ? ==equals()? к
SetԪDzظģôiterator()ظequals()жSetǷ
equals()==ֵǷָͬһequals()бǣΪǵĶݺĻֵ
14.һruntime exception?
𣺳ʱ쳣Щ
ArithmeticException(쳣)
ArrayStoreException(һһ͵Ķʱ)BufferOverflowException BufferUnderflowException CannotRedoException CannotUndoException ClassCastException CMMException ConcurrentModificationException DOMException EmptyStackException IllegalArgumentException IllegalMonitorStateException IllegalPathStateException IllegalStateException ImagingOpException IndexOutOfBoundsException MissingResourceException NegativeArraySizeException NoSuchElementException NullPointerException ProfileDataException ProviderException RasterFormatException SecurityException SystemException UndeclaredThrowableException UnmodifiableSetException UnsupportedOperationException..
15.errorexceptionʲô?
error ʾָDzܵѵµһ⡣˵ڴָܴ
exception ʾһƻʵ⡣Ҳ˵ʾӲᷢ
16.List Set MapǷ̳Collectionӿ
ListSetǣMap
17.abstract classinterface
:Ĵڶȥʵ(abstract class).ڴһijЩΪ࣬Ϊڸʵָ.ܴabstract classʵ.ǿһabstract classָһʵ.г캯̬.Abstract ΪǸегṩʵ֣ҲdzΪȡ֮ʵָ÷֪ΪʵЩ.
ӿ(interface)dzı塣ڽӿУзdzġ̳ԿͨʵĽӿڶáӿезdzģûһг塣ӿֻԶstatic finalԱӿڵʵƣ˸ʵܴӽӿڶм̳Ϊʵӿʱ()ֽӿڵķȻʵ˸ýӿڵκζϵýӿڵķг࣬ʹýӿΪñͨ͡Ķ̬ཫЧÿתӿͻӽӿתinstanceof ijǷʵ˽ӿ.
ӿһij.
18.ӿǷɼ̳нӿ? Ƿʵ(implements)ӿ? Ƿɼ̳ʵ(concrete class)
𣺽ӿڿԼ̳нӿڡʵ(implements)ӿڣɼ̳ʵ࣬ǰʵȷĹ캯
19.abstractmethodǷͬʱstaticǷͬʱnativeǷͬʱsynchronized
𣺶.synchronized:(ͬ.ͱͬʱһԵʱԵֵͬ.)
native:(طĹؼ֣ͨķñصĶ̬ӿCC++ȿĺ)
20.ConstructorǷɱoverride(캯)
𣺹Constructorܱ̳У˲дOverridingԱOverloading
1). nativefinalstaticsynchronized ģpublicprivateʲôûС
2). дreturnأʲô(null)
3). ֵܷ.
и""ֵˣͲǹඣֻǸͨ
4). super();this();ֻڹ췽.
5). Աʱֵȹ캯.
21.ǷԼ̳String
StringfinalʲԼ̳
22.try {}һreturn䣬ôtryfinally {}codeᱻִУʲôʱִУreturnǰǺ
𣺻ִУreturnǰִ
23.Чʵķ28춼
2 << 3
24.ֵͬ(x.equals(y) == true)ȴвͬhash code仰Բ
𣺲ԣͬhash code
C++Уÿеַ
javaҲһhash codeǵַһʶõġ(Ϊ)
ÿhash codeDzһģObjectĬhash codeǵǰõַġ
String⣬ǰStringhash codeģequals()ȽString
Ƿˣǵַ
Java Ӧóִڼ䣬ͬһ϶ε hashCode ʱһµطͬǰǶ equalsȽõϢûбġijһӦóһִеͬһӦóһִУ豣һ¡
equals(Object) ȵģôеÿϵ hashCode ͬ
DZģ equals(java.lang.Object) ȣôеһϵhashCode ضɲͬǣԱӦ֪ΪȵĶɲͬ߹ϣܡ
ʵϣ Object ඨ hashCode ȷʵԲͬĶزͬ(һͨöڲַתһʵֵģ JavaTM ԲҪʵּɡ)
25.һݵһ˷ɸıԣɷر仯Ľôﵽֵݻô
ֵݡJava ֵֻݲһʵΪһݵʱֵǶԸöáݿڱõķиı䣬Զı.
26.swtichǷbyteϣǷlongϣǷString
witch(expr1)Уexpr1һʽ˴ݸ switch case IJӦ int short char bytelongstring swtich
27.ArrayListVectorHashMapHashtable
𣺾ArrayListVectorҪӶ˵.
һ.ͬ:Vector̰߳ȫģҲ˵ͬģArrayList߳ȫģͬ
.:ҪʱVectorĬΪԭһ࣬ArrayListȴԭһ
HashMapHashTableҪ˵
һ.ʷԭ:Hashtableǻڳ¾ɵDictionaryģHashMapJava 1.2Mapӿڵһʵ
.ͬ:Hashtablḛ߳ȫģҲ˵ͬģHashMap߳ȫģͬ
.ֵֻHashMap㽫ֵΪһĿkeyvalue
28.GCʲô? ΪʲôҪGC
GCռ˼(Gabage Collection)ڴ洦DZԱ׳ĵطǻߴڴջᵼ³ϵͳIJȶJavaṩGCܿԶǷӶﵽԶڴĿģJavaûṩͷѷڴʾ
29.floatfloat f=3.4Ƿȷ?
:ȷȲȷӦǿתʾfloat f=(float)3.4
30.JAVAеCollection FrameWork(дԼݽṹ)?
Collection FrameWork£
Collection
List
LinkedList
ArrayList
Vector
Stack
Set
Map
Hashtable
HashMap
WeakHashMap
CollectionļϽӿڣһCollectionһObjectCollectionԪ(Elements)
Mapṩkeyvalueӳ.
31.ӿ?
𣺳ӿڶڳdz(JAVA)ԼIJʵ֣ӿȫһʶ(ͬʱжؼ̳еĹ)
JAVAʵķʵjava.io.Serializableӿ
CollectionʵֱȽҪʵComparable ӿں Comparator ӿ
32.STRINGSTRINGBUFFER
STRINGijDzɱģSTRINGBUFFERijǿɱġַеݾвرҪʱôʹStringBufferҪStringôʹStringBuffertoString()
33.̸̸final finally finalize
final—η(ؼ)һ౻Ϊfinalζµ࣬Ϊ౻̳СһܼȱΪ abstractģֱΪfinalġΪfinalԱ֤ʹвı䡣ΪfinalıʱֵԺֻܶȡġΪfinalķҲֻͬʹã
finally—쳣ʱṩ finally ִκ׳һ쳣ôƥ catch ӾͻִУȻƾͻ finally (еĻ)
finalize—Java ʹ finalize() ռڴȥ֮ǰҪռȷûбʱõġ Object жģе̳า finalize() ϵͳԴִfinalize() ռɾ֮ǰõ
34.Щ
Ҫķ棺
1.
Ǻһ뵱ǰĿصЩ棬Աֵע뵱ǰĿйصķ档˽ȫ⣬ֻѡеһ֣ʱòϸڡ棬һǹ̳ݳ
2.̳У
̳һIJģͣãṩһȷԵķһԴе̳Ϊ̳С̳ԭʼԣΪԭʼ()ԭʼΪĻ()ԴĻ̳зʵĻµķʹ֮ʺҪ
3.װ
װǰѹ̺ݰΧݵķֻͨѶĽ档ʼʵԱһϵȫΡװĶЩͨһܱĽӿڷ
4. ̬ԣ
ָ̬ͬĶͬһϢӦ̬̬ԺͰ̬ԡ̬ԾΪ빲ƣܺõĽӦóͬ⡣
35.String
𣺻Ͱbyteintcharlongfloatdoublebooleanshort
java.lang.Stringfinal͵ģ˲Լ̳ࡢࡣΪЧʽʡռ䣬ӦStringBuffer
36.int Integer ʲô
Java ṩֲͬͣͺԭʼ()IntjavaԭʼͣIntegerjavaΪintṩķװࡣJavaΪÿԭʼṩ˷װࡣԭʼͷװ࣬booleanBooleancharCharacterbyteByteshortShortintIntegerlongLongfloatFloatdoubleDoubleͺԭʼ͵ΪȫͬǾвͬ塣ͺԭʼ;вͬ÷ǰСٶ⣬͵ݽṹ洢ͺԭʼijʵʱָȱʡֵʵȱʡֵΪ nullԭʼʵȱʡֵǵй.
37.ʱ쳣һ쳣кͬ
쳣ʾйпֵܳķ״̬ʱ쳣ʾͨп쳣һֳдjavaҪ׳ܷķʱ쳣DzҪ׳δʱ쳣
38.˵ArrayListVector LinkedListĴ洢ܺ
ArrayListVectorʹ鷽ʽ洢ݣԪʵʴ洢ԱӺͲԪأǶֱӰԪأDzԪҪ漰ԪƶڴݿVectorʹsynchronized(̰߳ȫ)ͨϽArrayListLinkedListʹ˫ʵִ洢ҪǰDzʱֻҪ¼ǰɣԲٶȽϿ
39.HashMapHashtable
HashMapHashtableʵ(̰߳ȫʵ)ǶMapӿڣҪHashMap(null)ֵ(key)ڷ̰߳ȫЧϿܸHashtable
HashMapnullΪһentrykeyvalueHashtable
HashMapHashtablecontainsȥˣijcontainsvaluecontainsKeyΪcontains⡣
Hashtable̳Dictionary࣬HashMapJava1.2Map interfaceһʵ֡
IJͬǣHashtableķSynchronizeģHashMapǣڶ̷߳HashtableʱҪԼΪķʵͬHashMap ͱΪ֮ṩͬ
HashtableHashMapõhash/rehash㷨һܲкܴIJ졣
40.heapstackʲô****
ջһμϣӺɾԪصIJӦͬһɡջպȳķʽдջһԪ
41.Javaе쳣ƵļԭӦ
𣺵JAVAΥJAVAʱJAVAͻὫĴʾΪһ쳣Υ2һJAVAõ顣±Խ磬IndexOutOfBoundsException;nullĶʱNullPointerExceptionһJAVAԱչ飬ԱԴԼ쳣ѡںʱthrowؼ쳣е쳣java.lang.Thowableࡣ
42.յŵԭ2ֻջ
Javaһصջƣʹc++Աͷ۵ڴӭж⣬ʹJavaԱڱдʱҪڴиջƣJavaеĶ""ĸֻжò""տЧķֹڴй¶Чʹÿʹõڴ档ͨΪһĵͼ߳УԤ֪¶ڴѾĻ߳ʱûʹõĶͻգԱʵʱĵijжաջзִպͱգա
43.֪ļЩ?Ҫ?
õļ List Map List ľʵְ ArrayList VectorǿɱСбȽʺϹ洢ͲκͶԪб List ڰֵԪصΡ
Map ṩһͨõԪش洢 Map ڴ洢Ԫض("""ֵ")ÿӳ䵽һֵ
44.һJVMclassļԭ?
JVMװClassLoaderʵֵģJava ClassLoader һҪJavaʱϵͳʱҺװļࡣ
45.ļַ?о
ķУ(ֱӲϣ)(ð)ѡ(ֱѡ)鲢()
α롣
/ /ʹÿa[ 0 :n- 1 ]
a[ 0 :n- 1 ]ѡһԪΪm i d d l eԪΪ֧
µԪطָΪleft r i g h tʹl e f tеԪضСڵ֧㣬right еԪضڵ֧
ݹʹÿleft
ݹʹÿright
ýΪl e f t + m i d d l e + r i g h t
46.JAVAν쳣ؼ֣throwsthrowtrycatchfinallyֱʲô?tryп׳쳣?
Javaͨķ쳣Ѹֲͬ쳣з࣬ṩõĽӿڡJavaУÿ쳣һThrowableʵһ쳣׳һ쳣öа쳣ϢķԲ쳣дJava쳣ͨ5ؼʵֵģtrycatchthrowthrowsfinallyһtryִһγ쳣ϵͳ׳(throws)һ쳣ʱͨ(catch)(finally)ȱʡ
tryָһԤ"쳣"ijtry棬ӦһcatchӾָҪ"쳣"͡
throwȷ׳һ"쳣"
throwsһԱ׳ĸ"쳣"
FinallyΪȷһδ벻ܷʲô"쳣"ִһδ롣
һԱõдһtry䣬Աڲдһtry䱣롣ÿһtry䣬"쳣"Ŀܾͷŵջ棬ֱеtry䶼ɡһtryûжij"쳣"дջͻչֱд"쳣"try䡣
47.һ".java"ԴļǷ(ڲ)?ʲô?
𣺿ԡֻһļͬ
48.javaм͵?JDKΪÿ͵ṩһЩԹ̳У˵ǷֱЩ?
ַֽֽ̳InputStream OutputStreamַ̳InputStreamReader OutputStreamWriterjava.ioлҪΪܺʹ÷㡣
49.javaлڴй©
𣺻ᡣԼʵֶصݽṹʱпܻڴй¶
50.Ļԭʲô?ϻڴ?ʲô취֪ͨ
𣺶GC˵ԱʱGCͿʼĵַСԼʹͨGCͼķʽ¼(heap)ежַͨʽȷЩ"ɴ"Щ"ɴ"GCȷһЩΪ"ɴ"ʱGCλЩڴռ䡣ԡԱִֶSystem.gc()֪ͨGCУJavaԹ淶֤GCһִС
51.̬ʵ?
static i = 10; // class A a; a.i =10;//ɱ
52.ʲôjavaлʵjavaл?*****
лһĻƣνҲǽݽԶĶждҲɽĶ֮䡣лΪ˽ڶԶждʱ⡣
лʵ֣ҪлʵSerializableӿڣýӿûҪʵֵķimplements SerializableֻΪ˱עöǿɱлģȻʹһ(磺FileOutputStream)һObjectOutputStream()ţʹObjectOutputStreamwriteObject(Object obj)ͿԽΪobjĶд(״̬)ҪָĻ
53.ǷԴһstaticڲԷstaticĵ?
𣺲ԣаmethod();ܱ֤ʼ.
54.дclone()ʱͨһд룬ʲô?
Clone ȱʡΪsuper.clone();ȷСĿռ䣬λơ
55.JAVAУǰĶǶѭ?
break; return
56.ListMapSetӿڣȡԪʱʲôص?
List ضԪأظԪءSet ӵظԪأڲMap key-valueֵvalueɶֵ
57.˵һЩõ࣬ӿڣ5
𣺳õࣺBufferedReader BufferedWriter FileReader FileWirter String Integer
õİjava.lang java.awt java.io java.util java.sql
õĽӿڣRemote List Map Document NodeList
58.ʹJDBCݿĹ
javaĿ ⼰ 2014±Ŀ 2015ͨˮƽ java
Java⼯ 2015УƸJAVA JAVAԱ⼰() Javascript֮AJAXĻ֪ʶĿ
10JavaԱ⼯ 2014֧JAVA ¹IBM Javaı⸽
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
String url = "jdbc:obdc:mydb";
Connection con = DriverManager.getConnection(url);
Statement stmt = con.createStatement();
ResultSet rs = stmt.execte("select * from mytable");
59.ʲôJNDI?
javaĿ¼ӿ
60.Java ͨụ̋(ʴ)JAVA SOCKEṬַд뱾ʾ?
:Server˳:
package test;
import java.net.*;
import java.io.*;
public class Server
{
private ServerSocket ss;
private Socket socket;
private BufferedReader in;
private PrintWriter out;
public Server()
{
try
{
ss=new ServerSocket(10000);
while(true)
{
socket = ss.accept();
String RemoteIP = socket.getInetAddress().getHostAddress();
String RemotePort = ":"+socket.getLocalPort();
System.out.println("A client come in!IP:"+RemoteIP+RemotePort);
in = new BufferedReader(new
InputStreamReader(socket.getInputStream()));
String line = in.readLine();
System.out.println("Cleint send is :" + line);
out = new PrintWriter(socket.getOutputStream()true);
out.println("Your Message Received!");
out.close();
in.close();
socket.close();
}
}catch (IOException e)
{
out.println("wrong");
}
}
public static void main(String[] args)
{
new Server();
}
};
Client˳:
package test;
import java.io.*;
import java.net.*;
public class Client
{
Socket socket;
BufferedReader in;
PrintWriter out;
public Client()
{
try
{
System.out.println("Try to Connect to 127.0.0.1:10000");
socket = new Socket("127.0.0.1"10000);
System.out.println("The Server Connected!");
System.out.println("Please enter some Character:");
BufferedReader line = new BufferedReader(new
InputStreamReader(System.in));
out = new PrintWriter(socket.getOutputStream()true);
out.println(line.readLine());
in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
System.out.println(in.readLine());
out.close();
in.close();
socket.close();
}catch(IOException e)
{
out.println("Wrong");
}
}
public static void main(String[] args)
{
new Client();
}
};
61. ̵߳Ļ̵߳ı״̬Լ״̬֮Ĺϵ
•½ (Born) : ½̴߳½״̬
• (Ready) : ڴ̺߳ھ״̬ȴ start()
• (Running) : ߳ڿʼִʱ״̬
•˯ (Sleeping) : ̵ִ߳пͨʹ sleep() ʱֹ˯ߺ߳̽״̬
•ȴ (Waiting) : wait() ߳̽ڵȴ״̬̲߳ʱ
• (Suspended) : ʱֹͣж̵ִ߳ʱ߳̾ʹڹ״̬
•ָ (Resume) : ڹִָ̱߳ʱ˵ѱָ
• (Blocked) – ̵߳ȴһ¼ʱ(/)ͳ䴦״̬
• (Dead) – run() ִл stop() ֮߳̾ʹ״̬
лעԼʵִлѭDzԴлġWriteObject ReadObect
62.ڲҪ?
̬ڲо̬ԱǾ̬ڲо̬Ա
̬ڲķǾ̬ԱԷⲿľ̬ɷⲿķǾ̬
Ǿ̬ڲķǾ̬ԱԷⲿķǾ̬
63.javaмַʵһ߳?ʲôؼͬ? stop()suspend()ΪβƼʹ?
ʵֱַǼ̳ThreadʵRunnableӿ
synchronizedؼͬ
ʹstop()Ϊȫ̻߳ȡһֲ״̬ô߳״̬¼ǡѼڡsuspend()suspend()ʱĿ̻߳ͣȴȻ֮ǰõʱκ̶ܷ߳ԴDZ""ָ̻߳Сκ߳˵ָĿ̣߳ͬʱͼʹκһԴͻԲӦʹsuspend()ӦԼThreadһ־ָ߳Ӧûǹ־ָ߳Ӧù𣬱wait()ȴ״̬־ָ߳Ӧָһnotify()̡߳
64.sleep() wait() ʲô?
sleep߳(Thread)ķ´ִָ߳ͣʱ䣬ִл̣߳Ǽ״̬Ȼ֣ʱԶָsleepͷŶ
waitObjectķԴ˶wait±̷߳ȴ˶ĵȴأֻԴ˶notify(notifyAll)̲߳Žö״̬
65.ͬ첽кͬʲô·ֱʹ?˵
ݽ̼߳乲дԺܱһ̶߳ڶݿѾһ߳дˣôЩݾǹݣͬȡ
ӦóڶϵһҪѺܳʱִеķҲϣóȴķʱӦʹ첽̣ںܶ²첽;Чʡ
66.һ߳run()start()?
һ߳ǵstart()ʹ߳ڿ״̬ζJVMȲִСⲢζ߳̾ͻСrun()Բ˳ı־ֹͣһ̡߳
67.һ߳̽һһsynchronized߳Ƿɽ˶?
𣺲ܣһһsynchronizedֻһ̷߳ʡ
68.˵֪߳ͬķ
wait():ʹһ̴߳ڵȴ״̬ͷеĶlock
sleep():ʹһе̴߳˯״̬һ̬ô˷ҪInterruptedException쳣
notify():һڵȴ״̬̣߳עڵô˷ʱȷеĻijһȴ״̬̣߳JVMȷĸ̣߳Ҳǰȼ
Allnotity():дȴ״̬̣߳עⲢǸл߳һǾ
69.߳мʵַʲô?ͬмʵַʲô?
𣺶߳ʵֱַǼ̳ThreadʵRunnableӿ
ͬʵֱַ֣synchronizedwaitnotify
70.̵߳Ļ̵߳Ļ״̬Լ״̬֮Ĺϵ
ָ߳ڳִйУִܹгһִеλÿٶһ̣߳Ҳdz
Javaе߳״ֱ̬ǣС𡢽
71.synchronizedjava.util.concurrent.locks.Lockͬ ?
Ҫͬ㣺Locksynchronizedʵֵй
Ҫͬ㣺Lockбsynchronizedȷ߳õܡsynchronizedԶͷLockһҪԱֹͷţұfinallyӾͷš
jsp
1.jspЩö?÷ֱʲô?
JSP9ֻ(ASP6ڲӦ)
request ûGET/POSTIJ
response ҳû˵ĻӦ
pageContext ҳ
session йصĻỰ
application servlet ִе
out ͻӦ
config servletĹܲ
page JSPҳ
exception Դҳδ
2.jspЩ?÷ֱʲô?
:JSP6ֻ
jsp:includeҳ汻ʱһļ
jsp:useBeanѰһʵһJavaBean
jsp:setPropertyJavaBeanԡ
jsp:getPropertyijJavaBeanԡ
jsp:forwardתһµҳ档
jsp:pluginΪJavaOBJECTEMBED
4.JSPж̬INCLUDE뾲̬INCLUDE?
𣺶̬INCLUDEjsp:includeʵ
ǻļеı仯ʺڰ̬ҳ棬ҿԴ
̬INCLUDEincludeαʵ֣ļı仯ڰ̬ҳ
5.תʽֱʲô?ʲô?
ֱ֣Ϊ
ǰҳ治תincludeָҳ棬ֻʾҳĽҳ滹ԭҳ档ִ൱ںáҿԴ.ȫתҳ棬ٻ൱go to 䡣
6.JSPö
requestʾHttpServletRequestйϢṩ˼ڻȡcookie headersessionݵõķ
responseʾHttpServletResponseṩ˼ͻ Ӧķ(cookiesͷϢ)
outjavax.jsp.JspWriterһʵṩ˼ʹ
pageContextʾһjavax.servlet.jsp.PageContextڷȡַΧֿռ䡢servletصĶAPIҰװͨõservletعܵķ
sessionʾһjavax.servlet.http.HttpSessionSessionԴû״̬Ϣ
applicaton ʾһjavax.servle.ServletContextڲйservletservletϢ
configʾһjavax.servlet.ServletConfigöڴȡservletʵijʼ
pageʾӸҳһservletʵ
servletĿ
1.˵һ˵Servlet?
:servletõڵĶ壬غʵʼԼjavax.servlet.Servletӿڵinitservicedestroy ServletʵinitʱserviceserviceԶDzӦdoXXX(doGetdoPost)ȣʵٵʱdestroy
cgiservletڷУ̷ͨ߳ʽserviceһʵԷڶʵһ㲻٣CGIÿµḶ̌ɺ٣Чϵservlet
2.JAVA SERVLET APIforward() redirect()?
:ǰ߽пȨתڿͻַвʾתĵַ;ȫתõתĵַ·ӡĵַпԿתӵַԣǰ߸ӸЧǰ߿Ҫʱʹforward()ңҲʵʵӡЩ£磬ҪתһϵԴʹsendRedirect()
3.ServletĻܹ
public class ServletName extends HttpServlet {
public void doPost(HttpServletRequest request HttpServletResponse response) throws
ServletException IOException {
}
public void doGet(HttpServletRequest request HttpServletResponse response) throws
ServletException IOException {
}
}
4.ʲôµdoGet()doPost()?
JspҳеformǩmethodΪgetʱdoGet()ΪpostʱdoPost()
5.servlet
webservletڿʼͨservletinit()servletijʼͨservice()ʵ֣IJͬòͬdo***()webservletdestroy()
6.ʵservletĵ߳ģʽ
7. ҳݵķ
requestsessionapplicationcookie
8.ֻỰټ
𣺻ỰServletsJSP ҳ
pageǴһҳصĶԡһҳһõ Java servlet (Դκε include ָû include )ʾȰ servlet ְ servlet JSP ҳ
requestǴ Web ͻһصĶԡһܿԽҳ棬漰 Web ( forward ָ include Ĺϵ)
sessionǴij Web ͻһûصĶԡһ Web ỰҲԽͻ
applicationǴ Web ӦóصĶԡʵǿԽ Web Ӧóҳ桢ͻỰһȫ
10.webӦÿоijֱַiso8859-1ȣһijֱַ?
Public String translate (String str) {
String tempStr = "";
try {
tempStr = new String(str.getBytes("ISO-8859-1") "GBK");
tempStr = tempStr.trim();
}
catch (Exception e) {
System.err.println(e.getMessage());
}
return tempStr;
}
11.Servletִʱһʵļ?
public void init(ServletConfig config)
public ServletConfig getServletConfig()
public String getServletInfo()
public void service(ServletRequest requestServletResponse response)
public void destroy()
12.˵ӳصĹʲô?
J2EEʱὨһijӣһֱάֲڴĿijӡͻ˳Ҫʱ᷵һδʹõijӲΪæǰûпӣ½һӣ½ӵòʹõijӵɺӱΪУþͿʹӡ
13.Class.forName?ΪʲôҪ?
𣺵ø÷ʷһַָĶ
2016Java⼯£
2016Java֤⼰11-04
2016java classloader08-09
2016java⼰10-04
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2016java⼰11-14
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