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文件上传

pom.xml配置，导入文件上传的相应jar包

     
        
     
      javax.servlet.jsp
         
     
      javax.servlet.jsp-api
         
     
      2.3.3
       
      
        
     
      javax.servlet
         
     
      servlet-api
         
     
      2.5
       
      
        
     
      commons-io
         
     
      commons-io
         
     
      2.6
       
      
        
     
      commons-fileupload
         
     
      commons-fileupload
         
     
      1.3.3
       
    
   

index.jsp，设置表单enctype="multipart/form-data"

<%@page contentType="text/html;charset=UTF-8" language="java" %>
   
        上传用户：
    
    
    
    
    
    
 
    
    
 
   

文件上传具体实现Servlet

public class FileServlet extends HttpServlet {    @Override    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {        System.out.println("doPost...");        //判断是普通的表单还是带文件的表单        if (!ServletFileUpload.isMultipartContent(req)) {            System.out.println("return");            return;//终止方法运行        }        System.out.println("path");        //创建上传文件的保存路径，保存在WEB-INF下，用户无法直接访问        String uploadPath = this.getServletContext().getRealPath("/WEB-INF/upload");        File uploadfile = new File(uploadPath);        if (!uploadfile.exists()) {            uploadfile.mkdir();//创建        }        //缓存 临时文件        System.out.println("tempPath");        String tempPath = this.getServletContext().getRealPath("/WEB-INF/temp");        System.out.println(tempPath);        File tempFile = new File(tempPath);        if (!tempFile.exists()) {            tempFile.mkdir();//创建临时目录        }        try {            System.out.println("start");            //处理文件的上传路径和大小            DiskFileItemFactory factory = getDiskFileItemFactory(tempFile);            //获取ServletFileUpload            ServletFileUpload upload = getServletFileUpload(factory);            //处理上传的文件            String msg = uploadParseRequest(upload, req, uploadPath);            req.setAttribute("msg",msg);            req.getRequestDispatcher("info.jsp").forward(req,resp);        } catch (FileUploadException e) {            e.printStackTrace();        }    }    public static DiskFileItemFactory getDiskFileItemFactory(File file){        DiskFileItemFactory factory = new DiskFileItemFactory();        //设置缓冲区，上传文件大于缓冲区的时候，放入临时文件        factory.setSizeThreshold(1024*1024);        factory.setRepository(file);//临时目录        System.out.println("factorty!!");        return factory;    }    public static ServletFileUpload getServletFileUpload(DiskFileItemFactory factory){        ServletFileUpload upload = new ServletFileUpload(factory);        //监听文件上传进度        upload.setProgressListener(new ProgressListener() {            @Override            public void update(long pByteRead, long pContentLength, int pItems) {                System.out.println("总大小"+pContentLength+"已上传："+pByteRead);            }        });        //处理乱码问题        upload.setHeaderEncoding("UTF-8");        //设置单个文件的最大值        upload.setFileSizeMax(1024*1024*10);        //设置总共能够上传的文件的大小        upload.setSizeMax(1024*1024*10);        return upload;    }    public static String uploadParseRequest(ServletFileUpload upload,HttpServletRequest req,String uploadPath) throws IOException, FileUploadException {        String msg = "";        //处理上传文件        //把前端的请求封装成一个FileItems对象        List
   
     fileItems = upload.parseRequest(req);        for (FileItem fileItem : fileItems) {            //判断是普通的表单还是带文件的表单            if (fileItem.isFormField()){                //getFieldName是前端表单控件的name                String name = fileItem.getFieldName();                String value = fileItem.getString("UTF-8");                System.out.println(name+":"+value);            }else {                //处理上传的文件                String uploadFileName = fileItem.getName();                System.out.println("上传的文件名是“"+uploadFileName);                if (uploadFileName.trim().equals("")||uploadFileName==null){                    continue;                }                //获得上传文件名                String fileName = uploadFileName.substring(uploadFileName.lastIndexOf("/") + 1);                //获得文件的后缀名                String fileExtName = uploadFileName.substring(uploadFileName.lastIndexOf("." )+1);                System.out.println(fileName+"文件"+fileExtName);                //生成唯一识别的通用码                String uuidPath = UUID.randomUUID().toString();                String realPath = uploadPath+"/"+uuidPath;                File realPathFile = new File(realPath);                if (!realPathFile.exists()){                    realPathFile.mkdir();                }                //存放的地址                //文件传输                InputStream inputStream = fileItem.getInputStream();                FileOutputStream fos = new FileOutputStream(realPath + "/" + fileName);                byte[] buffer = new byte[1024*1024];                int len = 0;                while ((len=inputStream.read(buffer))>0){                    fos.write(buffer,0,len);                }                fos.close();                inputStream.close();                msg = "上传成功！";               fileItem.delete();//上传成功，删除临时文件            }        }        return msg;    }}
   

web.xml

       
    
     FileServlet
        
    
     com.zr.FileServlet
    
       
           
    
     FileServlet
            
    
     /upload.do
        
   

info.jsp上传成功界面

<%@ page contentType="text/html;charset=UTF-8" language="java" %>    ${msg}

邮件发送

新建Java项目，在lib包中导入activation-1.1.1.jar和mail-1.4.7.jar，右击lib，点击add as library添加到项目依赖中。

以qq邮箱为例：设置中开启SMTP和POP3服务获取授权码，以下例子中qjpgitodfatwbbfg为我的qq邮箱授权码。

简单邮件（只有文字的）

package com.zr;import com.sun.mail.util.MailSSLSocketFactory;import java.security.GeneralSecurityException;import java.util.Properties;import javax.mail.*;import javax.mail.internet.InternetAddress;import javax.mail.internet.MimeMessage;public class MailTest {    //简单邮件 没有图片和附件 纯文字    //复杂邮件 有图片和附件    //发送邮件 需开启smtp pop3服务 qjpgitodfatwbbfg    public static void main(String[] args) throws Exception {        Properties prop = new Properties();        prop.setProperty("mail.host","smtp.qq.com"); //设置qq邮件服务器        prop.setProperty("mail.transport.protocol","smtp"); //邮件发送协议        prop.setProperty("mail.smtp.auth","true"); //需要验证用户名和密码        //qq邮箱 需要设置SSL加密（其它邮箱不需要）        MailSSLSocketFactory sf = new MailSSLSocketFactory();        sf.setTrustAllHosts(true);        prop.put("mail.smtp.ssl.enable","true");        prop.put("mail.smtp.ssl.socketFactory",sf);        //创建定义整个应用程序所需环境信息的Session对象        Session session = Session.getDefaultInstance(prop, new Authenticator() {            @Override            public PasswordAuthentication getPasswordAuthentication() {                return new PasswordAuthentication("813794474@qq.com","qjpgitodfatwbbfg");            }        });        //开启Session的Debug模式，看到程序发送Email运行状态        session.setDebug(true);        //通过Session得到transport对象        Transport ts = session.getTransport();        //使用邮件的用户名和授权码连上邮件服务器        ts.connect("smtp.qq.com","813794474@qq.com","qjpgitodfatwbbfg");        //创建邮件        //创建邮件对象        MimeMessage message = new MimeMessage(session);        //邮件的发件人        message.setFrom(new InternetAddress("813794474@qq.com"));        //邮件的收件人        message.setRecipient(Message.RecipientType.TO,new InternetAddress("813794474@qq.com"));        //邮件的标题        message.setSubject("简单邮件");        //邮件内容        message.setContent("你好啊！","text/html;charset=UTF-8");        //发送        ts.sendMessage(message,message.getAllRecipients());        ts.close();    }}

文字+图片邮件

package com.zr;import com.sun.mail.util.MailSSLSocketFactory;import java.security.GeneralSecurityException;import java.util.Properties;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;public class MailTest2 {    //简单邮件 没有图片和附件 纯文字    //复杂邮件 有图片和附件    //发送邮件 需开启smtp pop3服务 qjpgitodfatwbbfg    public static void main(String[] args) throws Exception {        Properties prop = new Properties();        prop.setProperty("mail.host","smtp.qq.com"); //设置qq邮件服务器        prop.setProperty("mail.transport.protocol","smtp"); //邮件发送协议        prop.setProperty("mail.smtp.auth","true"); //需要验证用户名和密码        //qq邮箱 需要设置SSL加密（其它邮箱不需要）        MailSSLSocketFactory sf = new MailSSLSocketFactory();        sf.setTrustAllHosts(true);        prop.put("mail.smtp.ssl.enable","true");        prop.put("mail.smtp.ssl.socketFactory",sf);        //创建定义整个应用程序所需环境信息的Session对象        Session session = Session.getDefaultInstance(prop, new Authenticator() {            @Override            public PasswordAuthentication getPasswordAuthentication() {                return new PasswordAuthentication("813794474@qq.com","qjpgitodfatwbbfg");            }        });        //开启Session的Debug模式，看到程序发送Email运行状态        session.setDebug(true);        //通过Session得到transport对象        Transport ts = session.getTransport();        //使用邮件的用户名和授权码连上邮件服务器        ts.connect("smtp.qq.com","813794474@qq.com","qjpgitodfatwbbfg");        //创建邮件        //创建邮件对象        MimeMessage message = new MimeMessage(session);        //邮件的发件人        message.setFrom(new InternetAddress("813794474@qq.com"));        //邮件的收件人        message.setRecipient(Message.RecipientType.TO,new InternetAddress("813794474@qq.com"));        //邮件的标题        message.setSubject("带图片的邮件");        //准备图片的数据        MimeBodyPart image = new MimeBodyPart();        DataHandler dh = new DataHandler(new FileDataSource("D:\\IDEACode\\file-and-mail\\mail-java\\src\\404.jpg"));        image.setDataHandler(dh);        image.setContentID("404.jpg");        //准备正文数据        MimeBodyPart text = new MimeBodyPart();        text.setContent("这是一个带图片的邮件","text/html;charset=UTF-8");        //描述数据关系        MimeMultipart mm = new MimeMultipart();        mm.addBodyPart(text);        mm.addBodyPart(image);        //附件用mixed        mm.setSubType("related");        //设置到消息中 保存修改        message.setContent(mm);        message.saveChanges();        //发送        ts.sendMessage(message,message.getAllRecipients());        ts.close();    }}

文字+图片+附件邮件

package com.zr;import com.sun.mail.util.MailSSLSocketFactory;import java.security.GeneralSecurityException;import java.util.Properties;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;public class MailTest3 {    //简单邮件 没有图片和附件 纯文字    //复杂邮件 有图片和附件    //发送邮件 需开启smtp pop3服务 qjpgitodfatwbbfg    public static void main(String[] args) throws Exception {        Properties prop = new Properties();        prop.setProperty("mail.host","smtp.qq.com"); //设置qq邮件服务器        prop.setProperty("mail.transport.protocol","smtp"); //邮件发送协议        prop.setProperty("mail.smtp.auth","true"); //需要验证用户名和密码        //qq邮箱 需要设置SSL加密        MailSSLSocketFactory sf = new MailSSLSocketFactory();        sf.setTrustAllHosts(true);        prop.put("mail.smtp.ssl.enable","true");        prop.put("mail.smtp.ssl.socketFactory",sf);        //创建定义整个应用程序所需环境信息的Session对象        Session session = Session.getDefaultInstance(prop, new Authenticator() {            @Override            public PasswordAuthentication getPasswordAuthentication() {                return new PasswordAuthentication("813794474@qq.com","qjpgitodfatwbbfg");            }        });        //开启Session的Debug模式，看到程序发送Email运行状态        session.setDebug(true);        //通过Session得到transport对象        Transport ts = session.getTransport();        //使用邮件的用户名和授权码连上邮件服务器        ts.connect("smtp.qq.com","813794474@qq.com","qjpgitodfatwbbfg");        MimeMessage mimeMessage = imageMail(session);        //发送        ts.sendMessage(mimeMessage,mimeMessage.getAllRecipients());        ts.close();    }    public static MimeMessage imageMail(Session session) throws Exception{        //创建邮件        //创建邮件对象        MimeMessage message = new MimeMessage(session);        //邮件的发件人        message.setFrom(new InternetAddress("813794474@qq.com"));        //邮件的收件人        message.setRecipient(Message.RecipientType.TO,new InternetAddress("813794474@qq.com"));        //邮件的标题        message.setSubject("带图片和附件的邮件");        //准备图片的数据        MimeBodyPart image = new MimeBodyPart();        DataHandler dh = new DataHandler(new FileDataSource("D:\\IDEACode\\file-and-mail\\mail-java\\src\\404.jpg"));        image.setDataHandler(dh);        image.setContentID("404.jpg");        //准备正文数据        MimeBodyPart text = new MimeBodyPart();        text.setContent("这是一个带图片的邮件","text/html;charset=UTF-8");        //附件        MimeBodyPart body3 = new MimeBodyPart();        body3.setDataHandler(new DataHandler(new FileDataSource("D:\\IDEACode\\file-and-mail\\mail-java\\src\\ext.txt")));        body3.setFileName("e.txt");        //描述数据关系        MimeMultipart mm = new MimeMultipart();        mm.addBodyPart(text);        mm.addBodyPart(image);        //附件用mixed        mm.setSubType("related");        //将图片和文本设置为主体        MimeBodyPart context = new MimeBodyPart();        context.setContent(mm);        //拼接附件        MimeMultipart all = new MimeMultipart();        all.addBodyPart(body3);        all.addBodyPart(context);        all.setSubType("mixed");        //设置到消息中 保存修改        message.setContent(all);        message.saveChanges();        return message;    }}

注册成功邮件发送

新建Maven项目，在pom.xml中导入jsp,servlet,mail,activation相关的jar包依赖。

index.jsp 注册界面

 
   
         用户名：
    
    
     密码：
    
    
     邮箱：
    
    
     
   
  

info.jsp 注册后跳转的界面

***网站温馨提示
${message}

User 用户的pojo类

package com.zr.pojo;public class User {    private String username;    private String password;    private String email;    public User() {    }    public User(String username, String password, String email) {        this.username = username;        this.password = password;        this.email = email;    }    public String getUsername() {        return username;    }    public void setUsername(String username) {        this.username = username;    }    public String getPassword() {        return password;    }    public void setPassword(String password) {        this.password = password;    }    public String getEmail() {        return email;    }    public void setEmail(String email) {        this.email = email;    }    @Override    public String toString() {        return "User{" +                "username='" + username + '\'' +                ", password='" + password + '\'' +                ", email='" + email + '\'' +                '}';    }}

邮件发送的工具类

package com.zr.util;import com.sun.mail.util.MailSSLSocketFactory;import com.zr.pojo.User;import javax.mail.*;import javax.mail.internet.InternetAddress;import javax.mail.internet.MimeMessage;import java.util.Properties;//多线程改善用户体验 异步public class SendMail extends Thread{    private String from = "813794474@qq.com";    private String username = "813794474@qq.com";    private String password = "qjpgitodfatwbbfg";    private String host = "smtp.qq.com";    private User user;    public SendMail(User user){        this.user = user;    }    @Override    public void run() {        try {            Properties prop = new Properties();            prop.setProperty("mail.host", "smtp.qq.com"); //设置qq邮件服务器            prop.setProperty("mail.transport.protocol", "smtp"); //邮件发送协议            prop.setProperty("mail.smtp.auth", "true"); //需要验证用户名和密码            //qq邮箱 需要设置SSL加密            MailSSLSocketFactory sf = new MailSSLSocketFactory();            sf.setTrustAllHosts(true);            prop.put("mail.smtp.ssl.enable", "true");            prop.put("mail.smtp.ssl.socketFactory", sf);            //创建定义整个应用程序所需环境信息的Session对象            Session session = Session.getDefaultInstance(prop, new Authenticator() {                @Override                public PasswordAuthentication getPasswordAuthentication() {                    return new PasswordAuthentication("813794474@qq.com", "qjpgitodfatwbbfg");                }            });            //开启Session的Debug模式，看到程序发送Email运行状态            session.setDebug(true);            //通过Session得到transport对象            Transport ts = session.getTransport();            //使用邮件的用户名和授权码连上邮件服务器            ts.connect(host, username, password);            //创建邮件            //创建邮件对象            MimeMessage message = new MimeMessage(session);            //邮件的发件人            message.setFrom(new InternetAddress(from));            //邮件的收件人            message.setRecipient(Message.RecipientType.TO, new InternetAddress(user.getEmail()));            //邮件的标题            message.setSubject("注册邮件");            String info = "恭喜你注册成功！你的用户名："+user.getUsername()+",密码："+user.getPassword()+",请妥善保管！！";            //邮件内容            message.setContent(info, "text/html;charset=UTF-8");            message.saveChanges();            //发送            ts.sendMessage(message, message.getAllRecipients());            ts.close();        }catch (Exception e){            e.printStackTrace();        }    }}

RegisterServlet编写

public class RegisterServlet extends HttpServlet {    @Override    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {        //接收用户的请求 封装成对象        try {            String username = req.getParameter("username");            String passeord = req.getParameter("passeord");            String email = req.getParameter("email");            User user = new User(username,passeord,email);            //使用线程发送邮件，防止耗时，或注册人数过多引起的问题            SendMail sendMail = new SendMail(user);            sendMail.start();            //sendMail.run();            //用户登录注册成功后 给用户发一封邮件            //使用线程来发送邮件 防止出现耗时，和网站注册人数过多的情况            req.setAttribute("message","注册成功！！邮件已经发送到你的邮箱！注意查收！");            req.getRequestDispatcher("info.jsp").forward(req,resp);        } catch (Exception e) {            e.printStackTrace();            req.setAttribute("message","注册失败！");            req.getRequestDispatcher("info.jsp").forward(req,resp);        }    }    @Override    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {        doGet(req, resp);    }}