JAVA_WEB之文件上传和邮件发送

文件上传

需要的jar包：

commo.io;

文件上传要求：

1.为了文件的安全性，我们要把文件放在外界无法直接访问的目录下；

2.要限制文件的大小

3.为了防止发生重名覆盖的现象，我们要避免重名

4.可以限制文件的类型

package com.saxon.file;

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUpload;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.ProgressListener;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.IOException;
import java.math.BigDecimal;
import java.util.List;
import java.util.Random;
import java.util.UUID;

public class fileUpLoad extends HttpServlet {

    @Override
    protected void doGet (HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //判断文件是不是有文件上传的项
        if (! ServletFileUpload.isMultipartContent (req)) {
            return;//终止方法,没有文件上传的功能
        }
        //创建文件上传的路径 建议在WEB-INF目录下因为外部无法直接访问，比较安全；
        String realPath = this.getServletContext ().getRealPath ("/WEB-INF/load");
        File file = new File (realPath);
        if (! file.exists ()) {
            boolean mkdir = file.mkdir ();
        }
        //临时文件区域，当文件的大小超过了一定的大小，就放在这里，超过一定的时间九自动删除；
        String tempPath = this.getServletContext ().getRealPath ("/WEB-INF/temp");
        File temp = new File (tempPath);
        if (! temp.exists ()) {
            boolean mkdir = temp.mkdir ();
        }
        //获得一个工厂
        /*
          @see DiskFileItemFactory
         * public static final int DEFAULT_SIZE_THRESHOLD = 10240;
         *     private File repository; 存储库文件的地方
         *     private int sizeThreshold;  文件的大小
         *     private FileCleaningTracker fileCleaningTracker;清理文件
         *     private String defaultCharset;编码
         *      public static final String DEFAULT_CHARSET = "ISO-8859-1";
         */
        DiskFileItemFactory factory = new DiskFileItemFactory ();
        //factory要有。
        ServletFileUpload Upload = new ServletFileUpload ();
        //监听我们的进程的进度
        Upload.setProgressListener (new ProgressListener () {
            /**
             * @param pBytesRead 已经读取的文件
             * @param pContentLength 文件上传的大小
             * @param pItems 已经上传的项目
             */
            @Override
            public void update (long pBytesRead, long pContentLength, int pItems) {
            }
        });
        //获得文件的后缀和文件的名字

        //解析前端的请求，封装成一个fileitem对象
        List<FileItem> list = null;
        try {
            list = Upload.parseRequest (req);
            for (FileItem fileItem : list) {
                if (fileItem.isFormField ()) {

                }
            }
        } catch (FileUploadException e) {
            e.printStackTrace ();
        }
    }

    @Override
    protected void doPost (HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet (req, resp);
    }
}

邮件发送

package com.saxon.mail;

import com.sun.mail.util.MailSSLSocketFactory;

import javax.activation.DataHandler;
import javax.activation.FileDataSource;
import javax.mail.*;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;
import java.security.GeneralSecurityException;
import java.util.Properties;

public class mail {
    //配置文件
    public static void main (String[] args) throws Exception {
        Properties properties = new Properties ();
        //准备
        properties.setProperty ("mail.host", "smtp.qq.com");//设置QQ邮箱
        properties.setProperty ("mail.transport.protocol", "smtp");//设置发送协议
        properties.setProperty ("mail.smtp.auth", "true");//是否验证密码
        //QQ邮箱

        MailSSLSocketFactory socketFactory = new MailSSLSocketFactory ();
        socketFactory.setTrustAllHosts (true);
        properties.put ("mail.smtp.ssl.enable", "true");
        properties.put ("mail.smtp.ssl.socketFactory", socketFactory);


        //邮箱的五个步骤
        //1.设置session环境
        Session defaultInstance = Session.getDefaultInstance (properties, new Authenticator () {
            @Override
            protected PasswordAuthentication getPasswordAuthentication () {
                return new PasswordAuthentication ("2433027822@qq.com", "ffvluhisjcfzebab");//前一个写地址，后一个写验证码
            }
        });
        defaultInstance.setDebug (true);
        //2获得transport对象.用来发送邮件
        Transport ts = defaultInstance.getTransport ();
        //3.使用邮箱和授权码来进行连接
        ts.connect ("smtp.qq.com", "2433027822#qq.com", "ffvluhisjcfzebab");
        //4,编写邮件
        Message message = new MimeMessage (defaultInstance);
        //指明发件人
        message.addRecipient (Message.RecipientType.TO, new InternetAddress ("2433027822@qq.com"));
        //设置主题
        message.setSubject ("你好啊");
        //设置图片内容
        MimeBodyPart image = new MimeBodyPart ();
        //图片要处理一下数据
        DataHandler dataHandler = new DataHandler (new FileDataSource ("D:\\dnf补丁\\bg.jpg"));
        image.setDataHandler (dataHandler);
        image.setContentID ("bg.jpg");//这里设置的ID我们子啊后面可以接着使用
        //准备正文数据
        MimeBodyPart content=new MimeBodyPart ();
        content.setContent ("这是一个带有图片的邮件<img src='uid:bg.jpg'>","text/html;charset=utf-8");
        //描述数据关系
        MimeMultipart mm=new MimeMultipart ();
        mm.addBodyPart (image);
        mm.addBodyPart (content);
        mm.setSubType ("related");
        message.setText ("这是第一份邮件");

        //设置到消息中
        message.setContent (mm);//把最后消息发送到消息中
        message.saveChanges ();//保存修改
        //设置接受的人
        message.setFrom (new InternetAddress ("2433027822@qq.com"));
        //5.发送邮件
        ts.sendMessage (message,message.getAllRecipients ());
        ts.close ();
    }

}