在根目录下创建lib,maven库下载jar包并导入
https://mvnrepository.com/artifact/commons-io/commons-io
https://mvnrepository.com/artifact/commons-fileupload/commons-fileupload
可以打开cmd,ping域名获得域名对应公网IP地址
为避免同名图片的出现可以使用MD5加密还有uid,时间戳等等
package cn.csn.servlet; import org.apache.commons.fileupload.FileItem; 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.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.util.List; import java.util.UUID; @WebServlet(name = "FileServlet") public class FileServlet extends HttpServlet { private static final long serialVersionUID = 1L; protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub // response.getWriter().append("Served at: ").append(request.getContextPath()); // 判断上传的文件普通表单还是带文件的表单 if (!ServletFileUpload.isMultipartContent(request)) { return;//终止方法运行,说明这是一个普通的表单,直接返回 } //创建上传文件的保存路径,建议在WEB-INF路径下,安全,用户无法直接访间上传的文件; String uploadPath =this.getServletContext().getRealPath("/WEB-INF/upload"); File uploadFile = new File(uploadPath); if (!uploadFile.exists()){ uploadFile.mkdir(); //创建这个月录 } // 创建上传文件的保存路径,建议在WEB-INF路径下,安全,用户无法直接访问上传的文件 String tmpPath = this.getServletContext().getRealPath("/WEB-INF/tmp"); File file = new File(tmpPath); if (!file.exists()) { file.mkdir();//创建临时目录 } // 处理上传的文件,一般都需要通过流来获取,我们可以使用 request, getInputstream(),原生态的文件上传流获取,十分麻烦 // 但是我们都建议使用 Apache的文件上传组件来实现, common-fileupload,它需要旅 commons-io组件; try { // 创建DiskFileItemFactory对象,处理文件路径或者大小限制 DiskFileItemFactory factory = getDiskFileItemFactory(file); /* * //通过这个工厂设置一个缓冲区,当上传的文件大于这个缓冲区的时候,将他放到临时文件 factory.setSizeThreshold(1024 * * 1024); //缓存区大小为1M factory.setRepository (file);//临时目录的保存目录,需要一个File */ // 2、获取ServletFileUpload ServletFileUpload upload = getServletFileUpload(factory); // 3、处理上传文件 // 把前端请求解析,封装成FileItem对象,需要从ServletFileUpload对象中获取 String msg = uploadParseRequest(upload, request, uploadPath); // Servlet请求转发消息 System.out.println(msg); if(msg.equals("文件上传成功!")) { // Servlet请求转发消息 request.setAttribute("msg",msg); request.getRequestDispatcher("info.jsp").forward(request, response); }else { msg ="请上传文件"; request.setAttribute("msg",msg); request.getRequestDispatcher("info.jsp").forward(request, response); } } catch (FileUploadException e) { // TODO 自动生成的 catch 块 e.printStackTrace(); } } public static DiskFileItemFactory getDiskFileItemFactory(File file) { DiskFileItemFactory factory = new DiskFileItemFactory(); // 通过这个工厂设置一个缓冲区,当上传的文件大于这个缓冲区的时候,将他放到临时文件中; factory.setSizeThreshold(1024 * 1024);// 缓冲区大小为1M factory.setRepository(file);// 临时目录的保存目录,需要一个file return factory; } public static ServletFileUpload getServletFileUpload(DiskFileItemFactory factory) { ServletFileUpload upload = new ServletFileUpload(factory); // 监听长传进度 upload.setProgressListener(new ProgressListener() { // pBYtesRead:已读取到的文件大小 // pContextLength:文件大小 public void update(long pBytesRead, long pContentLength, int pItems) { System.out.println("总大小:" + pContentLength + "已上传:" + pBytesRead); } }); // 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); // 设置总共能够上传文件的大小 // 1024 = 1kb * 1024 = 1M * 10 = 10м return upload; } public static String uploadParseRequest(ServletFileUpload upload, HttpServletRequest request, String uploadPath) throws FileUploadException, IOException { String msg = ""; // 把前端请求解析,封装成FileItem对象 List<FileItem> fileItems = upload.parseRequest(request); for (FileItem fileItem : fileItems) { if (fileItem.isFormField()) {// 判断上传的文件是普通的表单还是带文件的表单 // getFieldName指的是前端表单控件的name; String name = fileItem.getFieldName(); String value = fileItem.getString("UTF-8"); // 处理乱码 System.out.println(name + ": " + value); } else {// 判断它是上传的文件 // ============处理文件============== // 拿到文件名 String uploadFileName = fileItem.getName(); System.out.println("上传的文件名: " + uploadFileName); if (uploadFileName.trim().equals("") || uploadFileName == null) { continue; } // 获得上传的文件名/images/girl/paojie.png String fileName = uploadFileName.substring(uploadFileName.lastIndexOf("/") + 1); // 获得文件的后缀名 String fileExtName = uploadFileName.substring(uploadFileName.lastIndexOf(".") + 1); /* * 如果文件后缀名fileExtName不是我们所需要的 就直按return.不处理,告诉用户文件类型不对。 */ System.out.println("文件信息[件名: " + fileName + " ---文件类型" + fileExtName + "]"); // 可以使用UID(唯一识别的通用码),保证文件名唯 // 0UID. randomUUID(),随机生一个唯一识别的通用码; String uuidPath = UUID.randomUUID().toString(); // ================处理文件完毕============== // 存到哪? uploadPath // 文件真实存在的路径realPath String realPath = uploadPath + "/" + uuidPath; // 给每个文件创建一个对应的文件夹 File realPathFile = new File(realPath); if (!realPathFile.exists()) { realPathFile.mkdir(); } // ==============存放地址完毕============== // 获得文件上传的流 InputStream inputStream = fileItem.getInputStream(); // 创建一个文件输出流 // realPath =真实的文件夹; // 差了一个文件;加上翰出文件的名产"/"+uuidFileName FileOutputStream fos = new FileOutputStream(realPath + "/" + fileName); System.out.println("path:"+realPath + "/" + fileName); // 创建一个缓冲区 byte[] buffer = new byte[1024 * 1024]; // 判断是否读取完毕 int len = 0; // 如果大于0说明还存在数据; while ((len = inputStream.read(buffer)) > 0) { fos.write(buffer, 0, len); } // 关闭流 fos.close(); inputStream.close(); msg = "文件上传成功!"; fileItem.delete(); // 上传成功,清除临时文件 //=============文件传输完成============= } } return msg; } }
注册xml
<servlet> <servlet-name>upload</servlet-name> <servlet-class>com.chen.FileSerlvet</servlet-class> </servlet> <servlet-mapping> <servlet-name>upload</servlet-name> <url-pattern>/upload.do</url-pattern>
导入依赖的jar包(如果是maven的话)
<!-- https://mvnrepository.com/artifact/commons-fileupload/commons-fileupload --> <dependency> <groupId>commons-fileupload</groupId> <artifactId>commons-fileupload</artifactId> <version>1.4</version> </dependency> <!-- https://mvnrepository.com/artifact/commons-io/commons-io --> <dependency> <groupId>commons-io</groupId> <artifactId>commons-io</artifactId> <version>2.6</version> </dependency>
index.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <body> <%-- GET:上传文件大小有限制 POST:上传文件大小没有限制 ${pageContext.request.contextPath} --%> <form action="upload.do" enctype="multipart/form-data" method="post"> 上传用户:<input type="text" name="username"><br/> <P><input type="file" name="file1"></P> <P><input type="file" name="file1"></P> <P><input type="submit" value="提交"> | <input type="reset"></P> </form> </body> </html>
info.jsp
<%@ page language="java" contentType="text/html;charset=UTF-8"%> <!DOCTYPE html> <html> <head> <title>Insert title here</title> </head> <body> <%=request.getAttribute("msg")%> </body> </html>
activation-1.1.1.jar
mail-1.4.7.jar
由上图我们可以确定几个必须步骤
1.创建session对象
2.创建Transport对象
3.使用邮箱的用户名和授权码连上邮件服务器
4.创建一个Message对象(需要传递session)
5.发送邮件
6.关闭连接
import com.sun.mail.util.MailSSLSocketFactory; import javax.mail.*; import javax.mail.internet.InternetAddress; import javax.mail.internet.MimeMessage; import java.util.Properties; public class MailDemo01 { 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); //使用javaMail发送邮件的5个步骤 //1.创建定义整个应用程序所需要的环境信息的session对象 Session session=Session.getDefaultInstance(prop, new Authenticator() { @Override protected PasswordAuthentication getPasswordAuthentication() { return new PasswordAuthentication("XXXX@qq.com","授权码"); } }); //开启session的debug模式,这样可以查看到程序发送Email的运行状态 session.setDebug(true); //2.通过session得到transport对象 Transport ts=session.getTransport(); //3.使用邮箱的用户名和授权码连上邮件服务器 ts.connect("smtp.qq.com","XXXX@qq.com","授权码"); //4.创建邮件:写文件 //注意需要传递session MimeMessage message=new MimeMessage(session); //指明邮件的发件人 message.setFrom(new InternetAddress("XXXX@qq.com")); //指明邮件的收件人 message.setRecipient(Message.RecipientType.TO,new InternetAddress("XXXX@qq.com")); //邮件标题 message.setSubject("发送的标题"); //邮件的文本内容 message.setContent("内容","text/html;charset=UTF-8"); //5.发送邮件 ts.sendMessage(message,message.getAllRecipients()); //6.关闭连接 ts.close(); } }
除了邮件内容部分,其他的部分代码往往是相同的,除了需要根据不同的邮箱运营商编写不同的配置代码外。邮件内容也被分为很多个部分,由文件、图片、附件等构成,编写邮件内容的过程,类似于积木的拼接,另外值得注意的是文本内容一般为HTML的格式发送。
每一个文本、图片、附件可以分为一个MimeBodyPart,由MimeMultipart完成组装
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.util.Properties; public class MailDemo02 { 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); //使用javaMail发送邮件的5个步骤 //1.创建定义整个应用程序所需要的环境信息的session对象 Session session=Session.getDefaultInstance(prop, new Authenticator() { @Override protected PasswordAuthentication getPasswordAuthentication() { return new PasswordAuthentication("11927XXX@qq.com","授权码"); } }); //开启session的debug模式,这样可以查看到程序发送Email的运行状态 session.setDebug(true); //2.通过session得到transport对象 Transport ts=session.getTransport(); //3.使用邮箱的用户名和授权码连上邮件服务器 ts.connect("smtp.qq.com","11927XXX@qq.com","授权码"); //4.创建邮件:写文件 //注意需要传递session MimeMessage message=new MimeMessage(session); //指明邮件的发件人 message.setFrom(new InternetAddress("11927XXX@qq.com")); //指明邮件的收件人 message.setRecipient(Message.RecipientType.TO,new InternetAddress("11927XXX@qq.com")); //邮件标题 message.setSubject("java发出"); //邮件的文本内容 //=================================准备图片数据======================================= MimeBodyPart image=new MimeBodyPart(); //图片需要经过数据化的处理 DataHandler dh=new DataHandler(new FileDataSource("D:\\Bert\\1594126632(1).jpg")); //在part中放入这个处理过图片的数据 image.setDataHandler(dh); //给这个part设置一个ID名字 image.setContentID("bz.jpg"); //准备正文的数据 MimeBodyPart text=new MimeBodyPart(); text.setContent("这是一张正文<img src='cid:bz.jpg'>","text/html;charset=UTF-8"); //描述数据关系 MimeMultipart mm=new MimeMultipart(); mm.addBodyPart(text); mm.addBodyPart(image); mm.setSubType("related"); //设置到消息中,保存修改 message.setContent(mm); message.saveChanges(); //5.发送邮件 ts.sendMessage(message,message.getAllRecipients()); //6.关闭连接 ts.close(); } }
import com.sun.mail.util.MailSSLSocketFactory; import javax.activation.DataHandler; import javax.activation.FileDataSource; import javax.mail.*; import javax.mail.internet.*; import java.util.Properties; public class MailDemo03 { 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); //使用javaMail发送邮件的5个步骤 //1.创建定义整个应用程序所需要的环境信息的session对象 Session session=Session.getDefaultInstance(prop, new Authenticator() { @Override protected PasswordAuthentication getPasswordAuthentication() { return new PasswordAuthentication("1192XXXX@qq.com","授权码"); } }); //开启session的debug模式,这样可以查看到程序发送Email的运行状态 session.setDebug(true); //2.通过session得到transport对象 Transport ts=session.getTransport(); //3.使用邮箱的用户名和授权码连上邮件服务器 ts.connect("smtp.qq.com","1192XXXX@qq.com","授权码"); //4.创建邮件:写文件 //注意需要传递session MimeMessage message=new MimeMessage(session); //指明邮件的发件人 message.setFrom(new InternetAddress("1192XXXX@qq.com")); //指明邮件的收件人 message.setRecipient(Message.RecipientType.TO,new InternetAddress("1192XXXX@qq.com")); //邮件标题 message.setSubject("java发出"); //邮件的文本内容 //=================================准备图片数据 MimeBodyPart image=new MimeBodyPart(); //图片需要经过数据化的处理 DataHandler dh=new DataHandler(new FileDataSource("D:\\Bert\\1594126632(1).jpg")); //在part中放入这个处理过图片的数据 image.setDataHandler(dh); //给这个part设置一个ID名字 image.setContentID("bz.jpg"); //=================================准备正文数据 MimeBodyPart text=new MimeBodyPart(); text.setContent("这是一张正文<img src='cid:bz.jpg'>","text/html;charset=UTF-8"); //=================================准备附件数据 MimeBodyPart body1= new MimeBodyPart(); body1.setDataHandler(new DataHandler(new FileDataSource("D:\\Bert\\cmd.txt"))); body1.setFileName("1.txt"); //描述数据关系 MimeMultipart mm=new MimeMultipart(); mm.addBodyPart(body1); mm.addBodyPart(text); mm.addBodyPart(image); mm.setSubType("mixed"); //设置到消息中,保存修改 message.setContent(mm); message.saveChanges(); //5.发送邮件 ts.sendMessage(message,message.getAllRecipients()); //6.关闭连接 ts.close(); } }
<html> <body> <h2>Hello World!</h2> <form action="${pageContext.request.contextPath}/RegisterServlet.do" method="post"> 用户名:<input type="text" name="username"> 密码:<input type="text" name="pwd"> 邮箱:<input type="text" name="email"> <input type="submit" value="注册"> </form> </body> </html>
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 + '\'' + '}'; } }
<servlet> <servlet-name>RegisterServlet</servlet-name> <servlet-class>cn.csn.MailDemo01.servlet.RegisterServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>RegisterServlet</servlet-name> <url-pattern>/RegisterServlet.do</url-pattern> </servlet-mapping>
import cn.csn.MailDemo01.pojo.User; import cn.csn.MailDemo01.utils.Sendmail; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; public class RegisterServlet extends HttpServlet { @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { String username=req.getParameter("username"); String password=req.getParameter("pwd"); String email=req.getParameter("email"); User user=new User(username,password,email); Sendmail send=new Sendmail(user); send.start(); System.out.println("success"); } @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { doPost(req, resp); } }
import cn.csn.MailDemo01.pojo.User; import com.sun.mail.util.MailSSLSocketFactory; import javax.mail.*; import javax.mail.internet.InternetAddress; import javax.mail.internet.MimeMessage; import java.util.Properties; public class Sendmail extends Thread { private String from="XXX@qq.com"; 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",host);///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); //使用javaMail发送邮件的5个步骤 //1.创建定义整个应用程序所需要的环境信息的session对象 Session session= Session.getDefaultInstance(prop, new Authenticator() { @Override protected PasswordAuthentication getPasswordAuthentication() { return new PasswordAuthentication(from,"授权码"); } }); //开启session的debug模式,这样可以查看到程序发送Email的运行状态 session.setDebug(true); //2.通过session得到transport对象 Transport ts=session.getTransport(); //3.使用邮箱的用户名和授权码连上邮件服务器 ts.connect(host,from,"授权码"); //4.创建邮件:写文件 //注意需要传递session MimeMessage message=new MimeMessage(session); //指明邮件的发件人 message.setFrom(new InternetAddress(from)); //指明邮件的收件人 message.setRecipient(Message.RecipientType.TO,new InternetAddress(user.getEmail())); //邮件标题 message.setSubject("注册通知"); //邮件的文本内容 message.setContent("恭喜你("+user.getUsername()+")成功注册!"+"密码:"+user.getPassword() ,"text/html;charset=UTF-8"); //5.发送邮件 ts.sendMessage(message,message.getAllRecipients()); //6.关闭连接 ts.close(); }catch (Exception e){ System.out.println(e); } } }