springIoC语文初中教育教育专区

1、user.javapublic class user private long id; private string name; private string password; private string group; public user(string name,string password) = name; this.password = password;/相应的相应的get/set方法方法.memoryuserpersist.javapublic class memoryuserpersist private static map users = new h

2、ashmap(); static user defaultadmin = new user(mike,“mm123); users.put(defaultadmin.getname(),defaultadmin); public memoryuserpersist () public void saveuser(user user) users.put(user.getname(),user); public user loaduser(string username) return (user)users.get(username); memoryuserpersist userpersis

3、t = new memoryuserpersist ( );userpersist.saveuser(user); 开发初期，将用户持久化到内存中，用于系统演示public interface userdao public void save(user user); public user load(string name);public class memoryuserdao implements userdao private static map users = new hashmap(); static user user = new user(“mike”,“mm123); user

4、s.put(user.getname(),user); public void save(user user) users.put(user.getid(),user); public user load(string name) return (user)users.get(name); userdao userdao = new memoryuserdao();userdao.save(user);public class textuserdao implements userdaopublic void save(user user) 打开数据文件 写入数据 关闭文件 public us

5、er load(string name) 打开文件； 读取数据到user u中； 关闭文件； return u; 持久化到文本文件中userdao userdao = new textuserdao();userdao.save(user);public class userdaofactory public static userdao createuserdao() return new memoryuserdao(); 客户端userregister代码片段如下：userdao userdao = userdaofactory. createuserdao( );userdao.save

6、(user);现在如果再要更换持久化方式，比如使用文本文件持久化用户信息。就算有再多的客户代码调用了用户持久化对象我们都不用担心了。因为客户端和用户持久化对象的具体实现完全解耦。我们唯一要修改的只是一个userdaofactory类。public class userdaofactory public static userdao createuserdao( ) string classname = ; classname=从属性文件中取得这个userdao的实现类全名。 userdao userdao = null; try userdao = (userdao)class.forname

7、(classname).newinstance(); catch (exception e) e.printstacktrace(); return userdao; 如果要改变持久化方案，只需要修改配置文件public class userregister private userdao userdao = null;/由容器注入的实例对象 public void setuserdao(userdao userdao) this.userdao = userdao; / userregister的业务方法string idstr=.; /解析元素的id，获取其字符串为userregister

8、;/idstr=“userreigster”string classstr=.;/解析,获取class为com.dev.spring.simple.userregister;/classstr=“com.dev.spring.simple.userregister”class clazz=class.forname(classstr); object obj=clazz.newinstance( );/建立userregister的一个对象；container.put(idstr,obj);string propertyname=.;/解析的name，获取属性名为userdao;/proper

9、tyname=“userdao”;string refstr=.; /解析的ref,获取值为usermemorydao;/refstr=“usermemorydao”string settername=set+propertyname.substring(0,1).touppercase( )+propertyname.substring(1); /生成setuserdao方法名；object parambean=container.get(refstr);method setter=clazz.getmethod(settername,parambean.getclass( );setter

10、.invoke(obj,parambean);reference:spring3.0 reference chp3-3.2 reference:spring3.0 reference chp3-3.2applicationcontext context =new classpathxmlapplicationcontext( new string “applicationcontext.xml“ );petstoreserviceimpl service = context.getbean(petstore, petstoreserviceimpl.class); 1com.mysql.jdb

11、c.driverpublic class test private map prices; /* setprices */public class test private map prices; /* setprices */ componentpublic class loginaction extends actionsupportprivate userdao userdao; resource(name=“userdaohibernateimpl”)public void setuserdao(userdao userdao) this.userdao=userdao; depend

12、son(“steelaxe”,”abc”)componentpublic class chinese implements personcomponentlazy(true)public class chinese implements personcomponentpublic class chinese implements personautowiredpublic void prepare(axe axe, dog dog) componentpublic class chinese implements person autowired private axe axe; autowired private dog dog;