Space

/* * To change this license header, choose License Headers in Project Properties. * To change this template file, choose Tools | Templates * and open the template in the editor. */package testdem

public static void create2(int i) { Connection conn = null; Statement st = null; ResultSet rs = null; try { conn = JdbcUtils.getConnection(); st = conn.createStatement(ResultSet.TYPE_SC

//create1 速度较慢，create2较快，但是要根据数据库不同来决定//ps = conn.prepareStatement(sql, Statement.RETURN_GENERATED_KEYS); ps可以获取 id package cn.itcast.batch;import java.sql.Connection;import java.sql.Prepared

Dao - 提供接口DaoImpl - 实现DaoFactory - 工厂模式获取实现DaoExcetpion - jdbc异常处理 实现runtime exception类即可TestDemo - 主函数User - beandaoconfig.properties - 配置文件package cn.itcast.user;public interface Dao

//eg1,没有使用单实例，eg2有  package cn.itcast;import java.sql.Connection;import java.sql.DriverManager;import java.sql.ResultSet;import java.sql.SQLException;import java.sql.Statement;public fin

package com.test1.www;class NutritionFacts { //必须 private int servingSize; private int servings; //可选， Build类必须初始化 private int calories; private int fat; private int sodium; private int carb

if(items.getClass().isArray){ this.collection = new ArrayList(); int length = Array.getLength(items); for(int i=0;i<length;i++){ Object value = Array.get(items,i); this.collection.add(value);

RegisterServlet：检验server，client验证码是否一致ImageServlet: 产生验证码  Register.html function ChangeImage(img){ img.src=img.src+"?"+new Date().getTime(); } 用户名: 密码: 认证码：

用户输入FormServlet链接FormServlet-〉form.jsp->DoFormServletFormServlet:产生token，放在session中form.jsp：hidden拿到token数据 并一同提交到>DoFormServletDoFormServlet：检测是否重复提交表单 //FormServlet//产生表单public class

MyDataSource实现封装连接池，MyConnection实现connection类，通过代理模式相互调用 package cn.itcast;import java.sql.*;public class ConnectDemo { public static void main(String[] args) throws Exception { for(int i=

异常处理参考3层解耦 ublic class ScrollTest { public static void main(String[] args) throws SQLException { // TODO Auto-generated method stub Object[] params = new Object[]{"username","password"}; r

依赖注入对象可以 手工装配（建议） 和 自动装配package com.PersonDaoBean.test;public interface PersonDao { public abstract void add();}package com.PersonDaoBean.test;public class PersonDaoBean implemen

package com.dao.bean.www;import java.util.List;import java.util.Map;import java.util.Properties;import java.util.Set;public interface PersonServiceDao { public Map getMaps(); public Proper

<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p" xsi:schemaLocation="http://www.sp

IOC反转控制 PersonService属性 PersonDao personDao接受通过xml注入的对象 PersonDaoBean.  Person中save（）调用 PersonDaoBean中的add（）package com.PersonDaoBean.test;public interface PersonDao { public abstract void a

//Dao类package com.dao.bean.www;public interface PersonServiceDao { public abstract void save();}//Beanpackage com.bean.www;import com.dao.bean.www.PersonServiceDao;public class

1.添加commons-dbcp-1.4，commons-logging，commons-pool-1.2//线程池,commons.collections-3.2.1.jar，spring.jar2.利用spring的查询方法和jdbc  "DataSource数据源" package com.ming.www;import java.sql.ResultSet;import

package cn.itcast.batch;import java.sql.Connection;import java.sql.ParameterMetaData;import java.sql.PreparedStatement;import java.sql.ResultSet;import java.sql.SQLException;import java.util.Ar

package cn.itcast.Reflect;import java.lang.reflect.InvocationTargetException;import java.lang.reflect.Method;import java.sql.Connection;import java.sql.PreparedStatement;import java.sql.ResultSe

package cn.itcast.Reflect;import java.lang.reflect.Constructor;import java.lang.reflect.Field;import java.lang.reflect.InvocationTargetException;import java.lang.reflect.Method;public class Ref

public class CookiesServlet1 extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setCharacterEncod

public class CookiesServlet2 extends HttpServlet { // 显示商品详细信息 public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setC

package ming;public class CacheImmutale { private static int MAX_SIZE = 10; private static CacheImmutale[] cache = new CacheImmutale[MAX_SIZE]; private static int pos = 0; private final Stri

package ming;import java.awt.BorderLayout;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.event.InputEvent;import javax.swing.*;public class TestFrame {

package ming;import java.util.ArrayList;import java.util.Collection;import java.util.Comparator;import java.util.List;import java.util.TreeSet;/* * 按照hashcode或者length排列 * 以升序排列 * 实现TreeSet

package ming;import java.util.ArrayList;import java.util.Collection;import java.util.List;class MyClass{ public MyClass(T t){ System.out.println("t value is "+t); }}public class Generic

package ming;import java.util.ArrayList;import java.util.Collection;import java.util.List;/* * 返回最后一个被复制的元素 * dest必须是src的父类或者本身 * 作用：集合之间的赋值 * */public class GenericMethodTest { public s

//提供两种使用情况package ming;import java.util.ArrayList;import java.util.Collection;public class GenericMethodTest { static void fromArraytoCollection(T[] a, Collection c) { for (T o : a) { c.

package ming;import java.util.ArrayList;import java.util.Collection;import java.util.List;class Canvas { // ? extends Shape,定义了子类，所以List可以用 public void drawAll(List shapes) { for (Shape s :

package ming;class Apple3{ private T info; public Apple3(){} public Apple3(T info){ this.info = info; } public T getInfo() { return info; } public void setInfo(T info) { this.info = inf

package ming;public class Apple2 { public T info; public Apple2(T info) { this.info = info; } public T getInfo() { return info; } public void setInfo(T info) { this.info = info; }

1. 接口只能定义抽象方法，不包含已经提供实现的方法。 抽象类可以包含普通方法2. 接口不能定义静态方法。抽象类可以定义静态方法3. 接口里只能定义静态常量filed，不能定义普通filed。 抽象类可以定义普通field，也可以定义静态filed。4. 接口里面不包含构造器，抽象类可以包含构造器，抽象类里的构造器并不是用于创建对象，而是让其子类调用构造器来完成抽象类的初始化操作、

package ming;class Outer { class In { public In(String msg) { System.out.println(msg); } }}public class InTest extends Outer.In { public InTest(Outer outer) { outer.super("hello");

public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setCharacterEncoding("UTF-8"); response.setContentType("text/html;cha

public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setCharacterEncoding("UTF-8"); response.setContentType("text/html;cha

InputStream in = null; OutputStream out = null; try{ in = new FileInputStream(); int len=0; byte buffer[] = new byte[1024]; out = new FileOutputStream(); while((len=in.read(buffe

package ming;enum Operation { PLUS { public double eval(double x, double y) { return x + y; } }, MINS { public double eval(double x, double y) { return x - y; } }, TIMES {

package ming;interface GenderDoc { void info();}enum Gender implements GenderDoc { // public static final Gender MALE = new Gender("男"); MALE("男") { public void info() { System.out.printl

package ming;interface Teachable { void work();}class Programer { private String name; public String getName() { return name; } public void setName(String name) { this.name = name; }

package ming;enum Gender{ MALE("男"),FEMALE("女"); private String name; public String getName() { return name; } private Gender(String name) { this.name=name; } }public class enumTest