1.測試的實體Bean Person類
Person.java
package com.semovy.bean;
public class Person {
private String id;
private String name;
private String note;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getNote() {
return note;
}
public void setNote(String note) {
this.note = note;
}
public Person(String id, String name, String note) {
super();
this.id = id;
this.name = name;
this.note = note;
}
@Override
public String toString() {
// TODO Auto-generated method stub
return "id: " + id + " name: " + name + " note: " + note;
}
}
2.操作Person實體類的接口PersonService
PersonService.java
package com.semovy.service;
import java.util.ArrayList;
import java.util.List;
import com.semovy.bean.Person;
public interface PersonService {
public List<Person> persons = new ArrayList<Person>();
public abstract void addPerson(Person person);
public abstract Person getPersonById(String id);
public abstract void deletePersonById(String id);
//public abstract void updatePerson(Person person);
public abstract void displayPersonById(String id);
public abstract void displayAllPersons();
}
3.實現PersonService接口的PersonServiceImpl
PersonServiceImpl.java
package com.semovy.service.impl;
import java.util.Iterator;
import com.semovy.bean.Person;
import com.semovy.service.PersonService;
public class PersonServiceImpl implements PersonService {
public void addPerson(Person person) {
persons.add(person);
}
public void deletePersonById(String id) {
Iterator it = persons.iterator();
while(it.hasNext())
{
Person person = (Person)it.next();
if(person.getId().equals(id))
{
it.remove();
break;
}
}
}
public void displayAllPersons() {
Iterator it = persons.iterator();
while(it.hasNext())
{
Person person = (Person)it.next();
System.out.println(person.toString());
}
}
public void displayPersonById(String id) {
Iterator it = persons.iterator();
while(it.hasNext())
{
Person person = (Person)it.next();
if(person.getId().equals(id))
{
System.out.println(person.toString());
break;
}
}
}
public Person getPersonById(String id) {
Iterator it = persons.iterator();
while(it.hasNext())
{
Person person = (Person)it.next();
if(person.getId().equals(id))
{
return person;
}
}
return null;
}
/*public void updatePerson(Strin) {
Iterator it = persons.iterator();
while(it.hasNext())
{
Person person = (Person)it.next();
if(person == aperson)
{
persons.set(arg0, arg1)
}
}
}*/
}
4.寫日志的代理類LogProxy 它實現了InvocationHandler接口
LogProxy.java
package com.semovy.bean;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import org.apache.log4j.Level;
import org.apache.log4j.Logger;
public class LogProxy implements InvocationHandler {
Logger logger = Logger.getLogger(this.getClass().getName());
private Object delegate = null;
public Object getDelegate() {
return delegate;
}
public void setDelegate(Object delegate) {
this.delegate = delegate;
}
public Object bind(Object delegate) {
this.delegate = delegate;
return Proxy.newProxyInstance(delegate.getClass().getClassLoader(),
delegate.getClass().getInterfaces(),this);
}
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
Object result = null;
try
{
logger.log(Level.INFO,method.getName() + " 開始處理...");
result = method.invoke(this.delegate, args);
logger.log(Level.INFO,method.getName() + " 結束處理...");
}catch(Exception e)
{
logger.log(Level.ERROR,e.getLocalizedMessage());
}
return result;
}
}
5.在eclipse中添加log4j.properties
log4j.properties
log4j.rootLogger=DEBUG,stdout
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d %5p (%F:%L) - %m%n
5.寫測試類Test.java
Test.java
package com.semovy.test;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Iterator;
import java.util.List;
import com.semovy.bean.LogProxy;
import com.semovy.bean.Person;
import com.semovy.service.PersonService;
import com.semovy.service.impl.PersonServiceImpl;
public class Test {
/**
* @param args
*/
public static void main(String[] args) {
LogProxy logProxy = new LogProxy();
PersonService personService = (PersonService)logProxy.bind(new PersonServiceImpl());
personService.addPerson(new Person("1","name1","note1"));
personService.addPerson(new Person("2","name2","note2"));
personService.addPerson(new Person("3","name3","note3"));
personService.addPerson(new Person("4","name4","note4"));
personService.displayPersonById("3");
personService.displayAllPersons();
Person person = personService.getPersonById("2");
person.setName("名稱2");
person.setNote("注腳2");
personService.displayAllPersons();
personService.deletePersonById("2");
personService.displayAllPersons();
//saveToFile(persons,"c:/persons.txt");
}
public static void saveToFile(List list,String path)
{
System.out.println("開始寫入文件...");
try
{
PrintWriter out = new PrintWriter(new File(path));
Iterator it = list.iterator();
while(it.hasNext())
{
Person person = (Person)it.next();
out.println(person.toString());
}
out.flush();
out.close();
System.out.println("結束寫入文件...");
}catch(IOException e)
{
System.out.println(e.getLocalizedMessage());
}
}
}
6.運行測試結果:
2008-02-05 02:55:28,926 INFO (LogProxy.java:34) - addPerson 開始處理...
2008-02-05 02:55:28,926 INFO (LogProxy.java:36) - addPerson 結束處理...
2008-02-05 02:55:28,926 INFO (LogProxy.java:34) - addPerson 開始處理...
2008-02-05 02:55:28,926 INFO (LogProxy.java:36) - addPerson 結束處理...
2008-02-05 02:55:28,926 INFO (LogProxy.java:34) - addPerson 開始處理...
2008-02-05 02:55:28,936 INFO (LogProxy.java:36) - addPerson 結束處理...
2008-02-05 02:55:28,936 INFO (LogProxy.java:34) - addPerson 開始處理...
2008-02-05 02:55:29,036 INFO (LogProxy.java:36) - addPerson 結束處理...
2008-02-05 02:55:29,036 INFO (LogProxy.java:34) - displayPersonById 開始處理...
id: 3 name: name3 note: note3
2008-02-05 02:55:29,036 INFO (LogProxy.java:36) - displayPersonById 結束處理...
2008-02-05 02:55:29,036 INFO (LogProxy.java:34) - displayAllPersons 開始處理...
id: 1 name: name1 note: note1
id: 2 name: name2 note: note2
id: 3 name: name3 note: note3
id: 4 name: name4 note: note4
2008-02-05 02:55:29,046 INFO (LogProxy.java:36) - displayAllPersons 結束處理...
2008-02-05 02:55:29,046 INFO (LogProxy.java:34) - getPersonById 開始處理...
2008-02-05 02:55:29,046 INFO (LogProxy.java:36) - getPersonById 結束處理...
2008-02-05 02:55:29,046 INFO (LogProxy.java:34) - displayAllPersons 開始處理...
id: 1 name: name1 note: note1
id: 2 name: 名稱2 note: 注腳2
id: 3 name: name3 note: note3
id: 4 name: name4 note: note4
2008-02-05 02:55:29,046 INFO (LogProxy.java:36) - displayAllPersons 結束處理...
2008-02-05 02:55:29,046 INFO (LogProxy.java:34) - deletePersonById 開始處理...
2008-02-05 02:55:29,046 INFO (LogProxy.java:36) - deletePersonById 結束處理...
2008-02-05 02:55:29,046 INFO (LogProxy.java:34) - displayAllPersons 開始處理...
id: 1 name: name1 note: note1
id: 3 name: name3 note: note3
id: 4 name: name4 note: note4
2008-02-05 02:55:29,046 INFO (LogProxy.java:36) - displayAllPersons 結束處理...