Javaweb网上商城项目实战补充内容（一）工具类-极客文库

CookUtils

package com.geekerstar.store.utils;

import javax.servlet.http.Cookie;

public class CookUtils {
	/**
	 * 通过名称在cookie数组获取指定的cookie
	 * @param name cookie名称
	 * @param cookies  cookie数组
	 * @return
	 */
	public static Cookie getCookieByName(String name, Cookie[] cookies) {
		if(cookies!=null){
			for (Cookie c : cookies) {
				//通过名称获取
				if(name.equals(c.getName())){
					//返回
					return c;
				}
			}
		}
		return null;
	}
}

JDBCUtils

配置c3p0连接池

package com.geekerstar.store.utils;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

import javax.sql.DataSource;

import com.mchange.v2.c3p0.ComboPooledDataSource;

public class JDBCUtils {
	private static ComboPooledDataSource ds = new ComboPooledDataSource();
	private static ThreadLocal tl=new ThreadLocal<>();
	
	/**
	 * 从线程中获取连接
	 * @return
	 * @throws SQLException
	 */
	public static Connection getConnection() throws SQLException {
		//从线程中获取conneciton
		Connection conn = tl.get();
		if(conn==null){
			conn=ds.getConnection();
			//和当前线程绑定
			tl.set(conn);
		}
		return conn;
	}

	// 获取数据源
	public static DataSource getDataSource() {
		return ds;
	}

	// 释放资源
	public static void closeResource( Statement st, ResultSet rs) {
		closeResultSet(rs);
		closeStatement(st);
	}
	
	// 释放资源
	public static void closeResource(Connection conn, Statement st, ResultSet rs) {
		closeResource(st, rs);
		closeConn(conn);
	}

	// 释放 connection
	public static void closeConn(Connection conn) {
		if (conn != null) {
			try {
				conn.close();
				//和线程解绑
				tl.remove();
			} catch (SQLException e) {
				e.printStackTrace();
			}
			conn = null;
		}
	}

	// 释放 statement ctrl + shift + f 格式化代码
	public static void closeStatement(Statement st) {
		if (st != null) {
			try {
				st.close();
			} catch (SQLException e) {
				e.printStackTrace();
			}
			st = null;
		}
	}

	// 释放结果集
	public static void closeResultSet(ResultSet rs) {
		if (rs != null) {
			try {
				rs.close();
			} catch (SQLException e) {
				e.printStackTrace();
			}
			rs = null;
		}
	}
	
	
	//开启事务
	public static void startTransaction() throws SQLException{
		getConnection().setAutoCommit(false);
	}
	
	/**
	 * 事务提交且释放连接
	 */
	public static void commitAndClose(){
		Connection conn = null;
		try {
			conn=getConnection();
			//事务提交
			conn.commit();
			//关闭资源
			conn.close();
			//解除版定
			tl.remove();
		} catch (SQLException e) {
			e.printStackTrace();
		}
	}
	
	/**
	 * 事务回滚且释放资源
	 */
	public static void rollbackAndClose(){
		Connection conn = null;
		try {
			conn=getConnection();
			//事务回滚
			conn.rollback();
			//关闭资源
			conn.close();
			//解除版定
			tl.remove();
		} catch (SQLException e) {
			e.printStackTrace();
		}
	}
	
	public static void main(String[] args) throws SQLException {
		System.out.println(getConnection());
	}
	
	
}

MailUtils

package com.geekerstar.store.utils;

import java.util.Properties;

import javax.mail.Authenticator;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.AddressException;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMessage.RecipientType;

public class MailUtils {

	public static void sendMail(String email, String emailMsg)
			throws AddressException, MessagingException {
		// 1.创建一个程序与邮件服务器会话对象 Session

		Properties props = new Properties();
		//设置发送的协议
		//props.setProperty("mail.transport.protocol", "SMTP");
		
		//设置发送邮件的服务器
		//props.setProperty("mail.host", "smtp.126.com");
		//props.setProperty("mail.smtp.auth", "true");// 指定验证为true

		// 创建验证器
		Authenticator auth = new Authenticator() {
			public PasswordAuthentication getPasswordAuthentication() {
				//设置发送人的帐号和密码
				return new PasswordAuthentication("admin@store.com", "admin");
			}
		};

		Session session = Session.getInstance(props, auth);

		// 2.创建一个Message，它相当于是邮件内容
		Message message = new MimeMessage(session);

		//设置发送者
		message.setFrom(new InternetAddress("admin@store.com"));

		//设置发送方式与接收者
		message.setRecipient(RecipientType.TO, new InternetAddress(email)); 

		//设置邮件主题
		message.setSubject("用户激活");
		// message.setText("这是一封激活邮件，请点击");

		String url="http://localhost:8080/store_v5/UserServlet?method=active&code="+emailMsg;
		String content="来自购物天堂的激活邮件!激活请点击以下链接!
"+url+"";
		//设置邮件内容
		message.setContent(content, "text/html;charset=utf-8");

		// 3.创建 Transport用于将邮件发送
		Transport.send(message);
	}
	public static void main(String[] args) throws AddressException, MessagingException {
		MailUtils.sendMail("aaa@store.com", "123456789");
	}
}

MD5Utils

package com.geekerstar.store.utils;

import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class MD5Utils {
	/**
	 * 使用md5的算法进行加密
	 */
	public static String md5(String plainText) {
		byte[] secretBytes = null;
		try {
			secretBytes = MessageDigest.getInstance("md5").digest(
					plainText.getBytes());
		} catch (NoSuchAlgorithmException e) {
			throw new RuntimeException("没有md5这个算法！");
		}
		String md5code = new BigInteger(1, secretBytes).toString(16);// 16进制数字
		// 如果生成数字未满32位，需要前面补0
		for (int i = 0; i < 32 - md5code.length(); i++) {
			md5code = "0" + md5code;
		}
		return md5code;
	}
	
	public static void main(String[] args) {
		String str=MD5Utils.md5("I have a dream!");
		System.out.println(str);
	}
}

MyBeanUtils

对BeanUtils进一步封装，同时处理日期转换

方式1：传递JavaBean实例，将数据封装到实例对象中
方式2：传递JavaBean class类型，通过反射进行实例化，然后封装数据

package com.geekerstar.store.utils;

import java.util.Map;

import org.apache.commons.beanutils.BeanUtils;
import org.apache.commons.beanutils.ConvertUtils;
import org.apache.commons.beanutils.converters.DateConverter;

public class MyBeanUtils {

	public static void populate(Object obj, Map map) {
		try {
			// 由于BeanUtils将字符串"1992-3-3"向user对象的setBithday();方法传递参数有问题,手动向BeanUtils注册一个时间类型转换器
			// 1_创建时间类型的转换器
			DateConverter dt = new DateConverter();
			// 2_设置转换的格式
			dt.setPattern("yyyy-MM-dd");
			// 3_注册转换器
			ConvertUtils.register(dt, java.util.Date.class);
			BeanUtils.populate(obj, map);
			
		} catch (Exception e) {
			throw new RuntimeException(e);
		}
	}
	
	
	public static T  populate(Class clazz, Map map) {
		try {
			
			T obj=clazz.newInstance();
			
			// 由于BeanUtils将字符串"1992-3-3"向user对象的setBithday();方法传递参数有问题,手动向BeanUtils注册一个时间类型转换器
			// 1_创建时间类型的转换器
			DateConverter dt = new DateConverter();
			// 2_设置转换的格式
			dt.setPattern("yyyy-MM-dd");
			// 3_注册转换器
			ConvertUtils.register(dt, java.util.Date.class);
			
			BeanUtils.populate(obj, map);
			
			return obj;
		} catch (Exception e) {
			throw new RuntimeException(e);
		}		
	}
	
}

UploadUtils

package com.geekerstar.store.utils;

import java.util.UUID;

public class UploadUtils {
	/**
	 * 获取随机名称
	 * @param realName 真实名称
	 * @return uuid
	 */
	public static String getUUIDName(String realName){
		//realname  可能是  1.jpg   也可能是  1
		//获取后缀名
		int index = realName.lastIndexOf(".");
		if(index==-1){
			return UUID.randomUUID().toString().replace("-", "").toUpperCase();
		}else{
			return UUID.randomUUID().toString().replace("-", "").toUpperCase()+realName.substring(index);
		}
	}
	
	/**
	 * 获取文件真实名称
	 * @param name
	 * @return
	 */
	public static String getRealName(String name){
		// c:/upload/1.jpg    1.jpg
		//获取最后一个"/"
		int index = name.lastIndexOf("\\");
		return name.substring(index+1);
	}
	
	/**
	 * 获取文件目录
	 * @param name 文件名称
	 * @return 目录
	 */
	public static String getDir(String name){
		int i = name.hashCode();
		String hex = Integer.toHexString(i);
		int j=hex.length();
		for(int k=0;k<8-j;k++){
			hex="0"+hex;
		}
		return "/"+hex.charAt(0)+"/"+hex.charAt(1);
	}
	
	@SuppressWarnings("unused")
	public static void main(String[] args) {
		//String s="G:\\day17-基础加强\\resource\\1.jpg";
		String s="1.jgp";
		String realName = getRealName(s);
		//System.out.println(realName);
		
		String uuidName = getUUIDName(realName);
		//System.out.println(uuidName);
		
		String dir = getDir(realName);
		System.out.println(dir);
		
		
	}
}

UUIDUtils

package com.geekerstar.store.utils;

import java.util.UUID;

public class UUIDUtils {
	/**
	 * 随机生成id
	 * 
	 * @return
	 */
	public static String getId() {
		return UUID.randomUUID().toString().replace("-", "").toUpperCase();
	}

	public static String getUUID64() {
		return getId() + getId();
	}

	/**
	 * 生成随机码
	 * 
	 * @return
	 */
	public static String getCode() {
		return getId();
	}

	public static void main(String[] args) {
		 System.out.println(getId());
		
		//for (int i = 0; i <= 100; i++) {
		//String str = UUID.randomUUID().toString();
		//			System.out.println(str);
		//}

	}
}

EncodingFilter

编码过滤器

package com.geekerstar.store.web.filter;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.Map;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import javax.servlet.http.HttpServletResponse;
/**
 * 统一编码
 * @author Administrator
 *
 */
public class EncodingFilter implements Filter {

	@Override
	public void init(FilterConfig filterConfig) throws ServletException {
		// TODO Auto-generated method stub

	}

	@Override
	public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws IOException, ServletException {
		//1.强转
		HttpServletRequest request=(HttpServletRequest) req;
		HttpServletResponse response=(HttpServletResponse) resp;
		//System.out.println("@@@@@@@@@@@@@@@@@@");		
		//2.放行
		chain.doFilter(new MyRequest(request), response);
	}

	@Override
	public void destroy() {
		// TODO Auto-generated method stub

	}

}

//之前的MyRequest增强了request.getParameter("name");方法
//增强了所有的获取参数的方法request.getParameterValues("name");
//增强了所有的获取参数的方法request.getParameterMap();
class MyRequest extends HttpServletRequestWrapper{
	private HttpServletRequest request;
	private boolean flag=true;
	
	
	public MyRequest(HttpServletRequest request) {
		super(request);
		this.request=request;
	}
	
	@Override
	public String getParameter(String name) {  
		if(name==null || name.trim().length()==0){
			return null;
		}
		String[] values = getParameterValues(name);
		if(values==null || values.length==0){
			return null;
		}
		
		return values[0];
	}
	
	@Override
	/**
	 * hobby=[eat,drink]
	 */
	public String[] getParameterValues(String name) {
		if(name==null || name.trim().length()==0){
			return null;
		}
		Map map = getParameterMap();
		if(map==null || map.size()==0){
			return null;
		}
		
		return map.get(name);
	}
	
	@Override
	/**
	 * map{ username=[tom],password=[123],hobby=[eat,drink]}
	 */
	public Map getParameterMap() {  
		
		/**
		 * 首先判断请求方式
		 * 若为post  request.setchar...(utf-8)
		 * 若为get 将map中的值遍历编码就可以了
		 */
		String method = request.getMethod();
		if("post".equalsIgnoreCase(method)){
			try {
				request.setCharacterEncoding("utf-8");
				return request.getParameterMap();
			} catch (UnsupportedEncodingException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}else if("get".equalsIgnoreCase(method)){
			Map map = request.getParameterMap();
			if(flag){
				for (String key:map.keySet()) {
					String[] arr = map.get(key);
					//继续遍历数组
					for(int i=0;i