java设计模式基础Word下载.docx
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zhansgan"
;
privatestaticSingletoninstance=null;
privateintcount=0;
static{
instance=newSingleton（）;
}
privateSingleton（）{
System.out.println（"
我是饿汉单例模式"
+count++）;
publicstaticSingletongetInstance（）{
returninstance;
}
Singleton1.java
//懒汉单例模式，在第一次调用的时候实例化自己
publicclassSingleton2{
publicstaticSingleton2singleton=null;
privateSingleton2（）{
我是懒汉单例模式"
）;
publicstaticSingleton2getInstance（）{
if（singleton==null）{
singleton=newSingleton2（）;
}
returnsingleton;
Test.java
packagecom.chinasofti.eec.test;
publicclassTest{
publicstaticvoidmain（String[]args）{
/*Singleton2.getInstance（）;
Singleton2.getInstance（）;
*/
/*System.out.println（Runtime.getRuntime（））;
System.out.println（Runtime.getRuntime（））;
2工厂模式
Factory.java
packagecom.chinasofti.eec.factory;
importcom.chinasofti.eec.fruit.Fruit;
publicclassFactory{
publicstaticFruitgetInstance（Class<
?
>
c）{
Fruitfruit=null;
try{
fruit=（Fruit）Class.forName（c.getName（））.newInstance（）;
}catch（Exceptione）{
//TODOAuto-generatedcatchblock
e.printStackTrace（）;
returnfruit;
Apple.java
packagecom.chinasofti.eec.fruit;
publicclassAppleimplementsFruit{
@Override
publicvoideat（）{
我吃的是苹果"
Banana.java
publicclassBananaimplementsFruit{
我吃的是香蕉"
Fruit.java
publicinterfaceFruit{
publicvoideat（）;
importcom.chinasofti.eec.factory.Factory;
importcom.chinasofti.eec.fruit.Apple;
importcom.chinasofti.eec.fruit.Banana;
publicclassTest2{
Factory.getInstance（Apple.class）.eat（）;
Factory.getInstance（Banana.class）.eat（）;
3代理模式
3-1代理类
MyInvocationHandler.java
packagecom.chinasofti.eec.proxy1;
importjava.lang.reflect.InvocationHandler;
importjava.lang.reflect.Method;
importjava.lang.reflect.Proxy;
/**
*代理类
*@authorAdministrator
*
*/
publicclassMyInvocationHandlerimplementsInvocationHandler{
privateObjectobj;
//被代理对象
publicObjectbind（Objectobj）{
this.obj=obj;
//初始化被代理对象
//动态的返回一个代理类，统一调用invoke（）确定此对象实现的接口实例
returnProxy.newProxyInstance（obj.getClass（）.getClassLoader（）,obj.getClass（）.getInterfaces（）,this）;
publicObjectinvoke（Objectproxy,Methodmethod,Object[]args）throwsThrowable{
抛媚眼之前"
Objecttemp=method.invoke（this.obj,args）;
抛媚眼之后"
returntemp;
}
Panjinlian.java
*被代理类
publicclassPanjinlianimplementsPrettyWomen{
publicvoidpaomeiyan（Stringname）{
潘金莲抛媚眼给"
+name）;
PrettyWomen.java
*定义的抛媚眼的一类人（什么事该做什么事不该做）
publicinterfacePrettyWomen{
publicvoidpaomeiyan（Stringname）;
importcom.chinasofti.eec.proxy1.PrettyWomen;
PrettyWomenpw=（PrettyWomen）newMyInvocationHandler（）.bind（newPanjinlian（））;
pw.paomeiyan（"
西门庆"
3-2被代理类
Wangpo.java
packagecom.chinasofti.eec.proxy;
publicclassWangPoimplementsPrettyWomen{
privatePrettyWomenpw=null;
publicWangPo（）{
super（）;
publicWangPo（PrettyWomenpw）{
this.pw=pw;
publicvoidpaomeiyan（）{
this.pw.paomeiyan（）;
publicvoidpaomeiyan（）{
潘金莲抛媚眼........"
publicvoidpaomeiyan（）;
WangPowp=newWangPo（newPanjinlian（））;
wp.paomeiyan（）;
链接数据库
JDBCutil.java
packagecom.chinasofti.eec.jdbcutil;
*链接数据库的工具类
importjava.sql.Connection;
importjava.sql.DriverManager;
publicclassJDBCutil{
publicstaticfinalStringDRIVER="
oracle.jdbc.driver.OracleDriver"
//orcale驱动
publicstaticfinalStringURL="
jdbc:
oracle:
thin:
@localhost:
1521:
XE"
//数据库的url
publicstaticfinalStringUSER="
system"
//用户名
publicstaticfinalStringPASSWORLD="
gqk"
//密码
privatestaticJDBCutilutil=null;
privatestaticConnectionconn=null;
Class.forName（DRIVER）;
conn=DriverManager.getConnection（URL,USER,PASSWORLD）;
privateJDBCutil（）{
publicstaticConnectiongetConnection（）{
returnconn;
publicstaticvoidmain（String[]args）{
System.out.println（JDBCutil.getConnection（））;
JDBCutil2.java
importjava.sql.SQLException;
publicclassJDBCutil2{
privatestaticJDBCutil2jdbc=null;
privateJDBCutil2（）{
/*publicstaticJDBCutil2getInstance（）{
if（jdbc==null）{
jdbc=newJDBCutil2（）;
returnjdbc;
}*/
publicsynchronizedstaticConnectiongetConnection（）throwsException{
Class.forName（DRIVER）;
if（conn==null）{
JDBC登录链接数据库
1链接数据库
@192.168.80.22:
0"
privatestaticJDBCutiljdbc=null;
publicstaticvoidmain（String[]args）throwsException{
System.out.println（getConnection（））;
2实体类
User.java
packagecom.chinasofti.eec.vo;
importjava.sql.Date;
publicclassUser{
privateintid;
privateStringname;
privateDatebirthday;
privateStringpwd;
publicStringgetPwd（）{
returnpwd;
publicvoidsetPwd（Stringpwd）{
this.pwd=pwd;
publicintgetId（）{
returnid;
publicvoidsetId（intid）{
this.id=id;
publicStringgetName（）{
returnname;
publicvoidsetName（Stringname）{
this.name=name;
publicDategetBirthday（）{
returnbirthday;
publicvoidsetBirthday（Datebirthday）{
this.birthday=birthday;
publicStringtoString（）{
return"
User[id="
+id+"
name="
+name+"
birthday="
+birthday+"
]"
3登录功能接口
UserDao.java
packagecom.chinasofti.eec.dao;
publicinterfaceUserDao{
booleanLoginInfo（Stringname,Stringpwd）;
UserImpl.java
importjava.sql.ResultSet;
importjava.sql.Statement;
importcom.chinasofti.eec.jdbcutil.JDBCutil;
publicclassUserImplimplementsUserDao{
privatestaticConnectionconn=null;
privatestaticStatements=null;
privatestaticResultSetrs=null;
publicbooleanLoginInfo（Stringname,Stringpwd）{
booleanflag=false;
Stringsql="
select*fromCHAOSHENXUEYUANwherelast_name="
+"
'
"
+name+"
andpwd="
+pwd;
System.out.println（sql）;
conn=JDBCutil.getConnection（）;
s=conn.createStatement（）;
rs=s.executeQuery（sql）;
if（rs.next（））{
flag=true;
}else{
flag=false;
}
returnflag;
4服务接口降低耦合度
UserService.java
packagecom.chinasofti.eec.service;
publicinterfaceUserService{
booleanloginInfo（Stringname,Stringpwd）;
UserServiceImpl.java
importcom.chinasofti.eec.dao.UserDao;
importcom.chinasofti.eec.dao.UserImpl;
publicclassUserServiceImplimplementsUserService{
publicbooleanloginInfo（Stringn,Stringp）{
UserDaoud=newUserImpl（）;
booleanfalg=ud.LoginInfo（n,p）;
returnfalg;
5视图层
importj
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