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如何从 Java 应用程序访问我的 Gmail 电子邮件？

发布于 2024-09-12 02:47:53 字数 45 浏览 4 评论 0原文

我想从 Java 代码中获取我的 Gmail 帐户的电子邮件。我该怎么做呢？

原文

I want to fetch the emails of my gmail account from Java code. How can I go about doing this?

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月下客 2024-09-19 02:47:53

这是刷新工作代码，它以正确的格式在控制台中显示电子邮件消息以及正在下载的附件......

import com.sun.mail.pop3.POP3Folder;
import com.sun.mail.pop3.POP3SSLStore;

import java.io.*;
import java.util.*;
import javax.mail.*;
import javax.mail.internet.MimeBodyPart;


public class MailfetchingPop3
{
    private Session session;
    private POP3SSLStore store;
    private String username;
    private String password;
    private POP3Folder folder;
    public static String numberOfFiles = null;
    public static int toCheck = 0;
    public static Writer output = null;
    URLName url;
    public static String receiving_attachments="C:\\download";

    public MailfetchingPop3()
    {
        session = null;
        store = null;
    }

    public void setUserPass(String username, String password)
    {
        this.username = username;
        this.password = password;
    }

    public void connect()
    throws Exception
    {
        String SSL_FACTORY = "javax.net.ssl.SSLSocketFactory";
        Properties pop3Props = new Properties();
        pop3Props.setProperty("mail.pop3.socketFactory.class", SSL_FACTORY);
        pop3Props.setProperty("mail.pop3.socketFactory.fallback", "false");
        pop3Props.setProperty("mail.pop3.port", "995");
        pop3Props.setProperty("mail.pop3.socketFactory.port", "995");
        url = new URLName("pop3", "pop.gmail.com", 995, "", username, password);
        session = Session.getInstance(pop3Props, null);
        store = new POP3SSLStore(session, url);
        store.connect();
    }

    public void openFolder(String folderName)
    throws Exception
    {
        folder = (POP3Folder)store.getFolder(folderName);
        System.out.println((new StringBuilder("For test----")).append
(folder.getParent().getFullName()).toString());
        if(folder == null)
            throw new Exception("Invalid folder");
        try
        {
            folder.open(2);
            System.out.println((new StringBuilder("Folder name----")).append
(folder.getFullName()).toString());
        }
        catch(Exception ex)
        {
            System.out.println((new StringBuilder("Folder Opening Exception..")).append(ex).toString());
        }
    }

    public void closeFolder()
    throws Exception
    {
        folder.close(false);
    }

    public int getMessageCount()
    throws Exception
    {
        return folder.getMessageCount();
    }

    public int getNewMessageCount()
    throws Exception
    {
        return folder.getNewMessageCount();
    }

    public void disconnect()
    throws Exception
    {
        store.close();
    }

    public void printAllMessages()
    throws Exception
    {
        Message msgs[] = folder.getMessages();
        FetchProfile fp = new FetchProfile();
        folder.fetch(msgs, fp);
        for(int i = 0; i < msgs.length; i++){
            Message message = msgs[i];
            dumpEnvelope(msgs[i]);
        System.out.println("==============================");
    System.out.println("Email #" + (i + 1));
    System.out.println("Subject: " + message.getSubject());
    System.out.println("From: " + message.getFrom()[0]);
    System.out.println("Text: " + message.getContent().toString());
        }
    }



    public static int saveFile(File saveFile, Part part) throws Exception {

        BufferedOutputStream bos = new BufferedOutputStream( new
FileOutputStream(saveFile) );

        byte[] buff = new byte[2048];
        InputStream is = part.getInputStream();
        int ret = 0, count = 0;
        while( (ret = is.read(buff)) > 0 ){
            bos.write(buff, 0, ret);
            count += ret;
        }
        bos.close();
        is.close();
        return count;
    }

    private static void dumpEnvelope(Message m) throws Exception
    {
        String body="";
        String path="";
        int size=0;
        Object content = m.getContent();
        if(content instanceof String){
            body = (String)content;
        }
        else if(content instanceof Multipart)
        {
            Multipart mp = (Multipart)content;
            for (int j=0; j < mp.getCount(); j++)
            {
                Part part = mp.getBodyPart(j);
                String disposition = part.getDisposition();
                //System.out.println("test disposition---->>"+disposition);
                if (disposition == null) {
                    // Check if plain
                    MimeBodyPart mbp = (MimeBodyPart)part;
                    if (mbp.isMimeType("text/plain")) {
                        body += mbp.getContent().toString();
                    }
                    else if (mbp.isMimeType("TEXT/HTML")) {
                        body += mbp.getContent().toString();
                    }
                    else {
                        //unknown
                    }
                } else if ((disposition != null) &&
                        (disposition.equals(Part.ATTACHMENT) || disposition.equals
(Part.INLINE) || disposition.equals("ATTACHMENT") || disposition.equals
("INLINE")) )
                {
                    // Check if plain
                    MimeBodyPart mbp = (MimeBodyPart)part;
                    if (mbp.isMimeType("text/plain")) {
                        body += (String)mbp.getContent();
                    }
                    else if (mbp.isMimeType("TEXT/HTML")) {
                        body += mbp.getContent().toString();
                    }
                    else {
                        File savedir = new File(receiving_attachments);
                        savedir.mkdirs();
                        File savefile = new File(savedir+"\\"+part.getFileName());
                        path = savefile.getAbsolutePath();
                        size = saveFile( savefile, part);

                    }
                }
            }
        }

    }
    public static void main(String args[])
    {
        try
        {
            MailfetchingPop3 gmail = new MailfetchingPop3();
            gmail.setUserPass("your-gmail-username", "your-gmail-password");
            gmail.connect();
            gmail.openFolder("INBOX");
            gmail.printAllMessages();

        }
        catch(Exception e)
        {
            e.printStackTrace();
            System.exit(-1);
        }
    }



}

Here is the Refresh Working Code, that Displays the Email msgs in the console in a proper format along with the Attachments also being Downloaded....

import com.sun.mail.pop3.POP3Folder;
import com.sun.mail.pop3.POP3SSLStore;

import java.io.*;
import java.util.*;
import javax.mail.*;
import javax.mail.internet.MimeBodyPart;


public class MailfetchingPop3
{
    private Session session;
    private POP3SSLStore store;
    private String username;
    private String password;
    private POP3Folder folder;
    public static String numberOfFiles = null;
    public static int toCheck = 0;
    public static Writer output = null;
    URLName url;
    public static String receiving_attachments="C:\\download";

    public MailfetchingPop3()
    {
        session = null;
        store = null;
    }

    public void setUserPass(String username, String password)
    {
        this.username = username;
        this.password = password;
    }

    public void connect()
    throws Exception
    {
        String SSL_FACTORY = "javax.net.ssl.SSLSocketFactory";
        Properties pop3Props = new Properties();
        pop3Props.setProperty("mail.pop3.socketFactory.class", SSL_FACTORY);
        pop3Props.setProperty("mail.pop3.socketFactory.fallback", "false");
        pop3Props.setProperty("mail.pop3.port", "995");
        pop3Props.setProperty("mail.pop3.socketFactory.port", "995");
        url = new URLName("pop3", "pop.gmail.com", 995, "", username, password);
        session = Session.getInstance(pop3Props, null);
        store = new POP3SSLStore(session, url);
        store.connect();
    }

    public void openFolder(String folderName)
    throws Exception
    {
        folder = (POP3Folder)store.getFolder(folderName);
        System.out.println((new StringBuilder("For test----")).append
(folder.getParent().getFullName()).toString());
        if(folder == null)
            throw new Exception("Invalid folder");
        try
        {
            folder.open(2);
            System.out.println((new StringBuilder("Folder name----")).append
(folder.getFullName()).toString());
        }
        catch(Exception ex)
        {
            System.out.println((new StringBuilder("Folder Opening Exception..")).append(ex).toString());
        }
    }

    public void closeFolder()
    throws Exception
    {
        folder.close(false);
    }

    public int getMessageCount()
    throws Exception
    {
        return folder.getMessageCount();
    }

    public int getNewMessageCount()
    throws Exception
    {
        return folder.getNewMessageCount();
    }

    public void disconnect()
    throws Exception
    {
        store.close();
    }

    public void printAllMessages()
    throws Exception
    {
        Message msgs[] = folder.getMessages();
        FetchProfile fp = new FetchProfile();
        folder.fetch(msgs, fp);
        for(int i = 0; i < msgs.length; i++){
            Message message = msgs[i];
            dumpEnvelope(msgs[i]);
        System.out.println("==============================");
    System.out.println("Email #" + (i + 1));
    System.out.println("Subject: " + message.getSubject());
    System.out.println("From: " + message.getFrom()[0]);
    System.out.println("Text: " + message.getContent().toString());
        }
    }



    public static int saveFile(File saveFile, Part part) throws Exception {

        BufferedOutputStream bos = new BufferedOutputStream( new
FileOutputStream(saveFile) );

        byte[] buff = new byte[2048];
        InputStream is = part.getInputStream();
        int ret = 0, count = 0;
        while( (ret = is.read(buff)) > 0 ){
            bos.write(buff, 0, ret);
            count += ret;
        }
        bos.close();
        is.close();
        return count;
    }

    private static void dumpEnvelope(Message m) throws Exception
    {
        String body="";
        String path="";
        int size=0;
        Object content = m.getContent();
        if(content instanceof String){
            body = (String)content;
        }
        else if(content instanceof Multipart)
        {
            Multipart mp = (Multipart)content;
            for (int j=0; j < mp.getCount(); j++)
            {
                Part part = mp.getBodyPart(j);
                String disposition = part.getDisposition();
                //System.out.println("test disposition---->>"+disposition);
                if (disposition == null) {
                    // Check if plain
                    MimeBodyPart mbp = (MimeBodyPart)part;
                    if (mbp.isMimeType("text/plain")) {
                        body += mbp.getContent().toString();
                    }
                    else if (mbp.isMimeType("TEXT/HTML")) {
                        body += mbp.getContent().toString();
                    }
                    else {
                        //unknown
                    }
                } else if ((disposition != null) &&
                        (disposition.equals(Part.ATTACHMENT) || disposition.equals
(Part.INLINE) || disposition.equals("ATTACHMENT") || disposition.equals
("INLINE")) )
                {
                    // Check if plain
                    MimeBodyPart mbp = (MimeBodyPart)part;
                    if (mbp.isMimeType("text/plain")) {
                        body += (String)mbp.getContent();
                    }
                    else if (mbp.isMimeType("TEXT/HTML")) {
                        body += mbp.getContent().toString();
                    }
                    else {
                        File savedir = new File(receiving_attachments);
                        savedir.mkdirs();
                        File savefile = new File(savedir+"\\"+part.getFileName());
                        path = savefile.getAbsolutePath();
                        size = saveFile( savefile, part);

                    }
                }
            }
        }

    }
    public static void main(String args[])
    {
        try
        {
            MailfetchingPop3 gmail = new MailfetchingPop3();
            gmail.setUserPass("your-gmail-username", "your-gmail-password");
            gmail.connect();
            gmail.openFolder("INBOX");
            gmail.printAllMessages();

        }
        catch(Exception e)
        {
            e.printStackTrace();
            System.exit(-1);
        }
    }



}
回复 原文
知足的幸福 2024-09-19 02:47:53

另一种选择：如果您不介意它是特定于 Gmail 的解决方案，请注意 Gmail 还向您的邮箱提供 RSS 提要，然后您可以使用普通的 XML 处理 API 进行访问。

Another option: if you don't mind it being a Gmail-specific solution, note that Gmail also provides an RSS feed to your mailbox, which you can then access with normal XML processing APIs.

回复 原文
幽蝶幻影 2024-09-19 02:47:53

Gmail 使用 IMAP，Javamail 可以使用 IMAP。尝试在实现中使用它，如果您遇到困难，请在此处发布一些更具体的问题。

Gmail uses IMAP, which Javamail can use. Try to use that in an implementation, and if you get stuck, post some more specific questions here.

回复 原文
旧话新听 2024-09-19 02:47:53

下面是使用邮局协议 (pop3) 从 gmail 帐户获取邮件及其附件（如果有）的代码。

import com.sun.mail.pop3.POP3Folder;
import com.sun.mail.pop3.POP3SSLStore;

import java.io.*;
import java.util.*;
import javax.mail.*;
import javax.mail.internet.MimeBodyPart;


public class MailfetchingPop3
{
    private Session session;
    private POP3SSLStore store;
    private String username;
    private String password;
    private POP3Folder folder;
    public static String numberOfFiles = null;
    public static int toCheck = 0;
    public static Writer output = null;
    URLName url;
    public static String receiving_attachments="C:\\download";

    public MailfetchingPop3()
    {
        session = null;
        store = null;
    }

    public void setUserPass(String username, String password)
    {
        this.username = username;
        this.password = password;
    }

    public void connect()
    throws Exception
    {
        String SSL_FACTORY = "javax.net.ssl.SSLSocketFactory";
        Properties pop3Props = new Properties();
        pop3Props.setProperty("mail.pop3.socketFactory.class", SSL_FACTORY);
        pop3Props.setProperty("mail.pop3.socketFactory.fallback", "false");
        pop3Props.setProperty("mail.pop3.port", "995");
        pop3Props.setProperty("mail.pop3.socketFactory.port", "995");
        url = new URLName("pop3", "pop.gmail.com", 995, "", username, password);
        session = Session.getInstance(pop3Props, null);
        store = new POP3SSLStore(session, url);
        store.connect();
    }

    public void openFolder(String folderName)
    throws Exception
    {
        folder = (POP3Folder)store.getFolder(folderName);
        System.out.println((new StringBuilder("For test----")).append(folder.getParent().getFullName()).toString());
        if(folder == null)
            throw new Exception("Invalid folder");
        try
        {
            folder.open(2);
            System.out.println((new StringBuilder("Folder name----")).append(folder.getFullName()).toString());
        }
        catch(Exception ex)
        {
            System.out.println((new StringBuilder("Folder Opening Exception..")).append(ex).toString());
        }
    }

    public void closeFolder()
    throws Exception
    {
        folder.close(false);
    }

    public int getMessageCount()
    throws Exception
    {
        return folder.getMessageCount();
    }

    public int getNewMessageCount()
    throws Exception
    {
        return folder.getNewMessageCount();
    }

    public void disconnect()
    throws Exception
    {
        store.close();
    }

    public void printAllMessages()
    throws Exception
    {
        Message msgs[] = folder.getMessages();
        FetchProfile fp = new FetchProfile();
        folder.fetch(msgs, fp);
        for(int i = 0; i < msgs.length; i++)
            dumpEnvelope(msgs[i]);

    }



    public static int saveFile(File saveFile, Part part) throws Exception {

        BufferedOutputStream bos = new BufferedOutputStream( new FileOutputStream(saveFile) );

        byte[] buff = new byte[2048];
        InputStream is = part.getInputStream();
        int ret = 0, count = 0;
        while( (ret = is.read(buff)) > 0 ){
            bos.write(buff, 0, ret);
            count += ret;
        }
        bos.close();
        is.close();
        return count;
    }

    private static void dumpEnvelope(Message m) throws Exception
    {
        String body="";
        String path="";
        int size=0;
        Object content = m.getContent();
        if(content instanceof String){
            body = (String)content;
        }
        else if(content instanceof Multipart)
        {
            Multipart mp = (Multipart)content;
            for (int j=0; j < mp.getCount(); j++)
            {
                Part part = mp.getBodyPart(j);
                String disposition = part.getDisposition();
                //System.out.println("test disposition---->>"+disposition);
                if (disposition == null) {
                    // Check if plain
                    MimeBodyPart mbp = (MimeBodyPart)part;
                    if (mbp.isMimeType("text/plain")) {
                        body += mbp.getContent().toString();
                    }
                    else if (mbp.isMimeType("TEXT/HTML")) {
                        body += mbp.getContent().toString();
                    }
                    else {
                        //unknown
                    }
                } else if ((disposition != null) &&
                        (disposition.equals(Part.ATTACHMENT) || disposition.equals(Part.INLINE) || disposition.equals("ATTACHMENT") || disposition.equals("INLINE")) )
                {
                    // Check if plain
                    MimeBodyPart mbp = (MimeBodyPart)part;
                    if (mbp.isMimeType("text/plain")) {
                        body += (String)mbp.getContent();
                    }
                    else if (mbp.isMimeType("TEXT/HTML")) {
                        body += mbp.getContent().toString();
                    }
                    else {
                        File savedir = new File(receiving_attachments);
                        savedir.mkdirs();
                        File savefile = new File(savedir+"\\"+part.getFileName());
                        path = savefile.getAbsolutePath();
                        size = saveFile( savefile, part);

                    }
                }
            }
        }

    }
    public static void main(String args[])
    {
        try
        {
            MailfetchingPop3 gmail = new MailfetchingPop3();
            gmail.setUserPass("your_gmail_Id", "your_gmail_mail_id_password");
            gmail.connect();
            gmail.openFolder("INBOX");
            gmail.printAllMessages();
        }
        catch(Exception e)
        {
            e.printStackTrace();
            System.exit(-1);
        }
    }



}

要运行这个java类，您需要下载 javamail.jar 和 < a href="http://www.java2s.com/Code/Jar/JKL/Downloadactivationjar.htm" rel="nofollow noreferrer">activation.jar

Here is the code which fetch mail along with it's attachments (if any) from a gmail account using POST OFFICE PROTOCOL (pop3) .

import com.sun.mail.pop3.POP3Folder;
import com.sun.mail.pop3.POP3SSLStore;

import java.io.*;
import java.util.*;
import javax.mail.*;
import javax.mail.internet.MimeBodyPart;


public class MailfetchingPop3
{
    private Session session;
    private POP3SSLStore store;
    private String username;
    private String password;
    private POP3Folder folder;
    public static String numberOfFiles = null;
    public static int toCheck = 0;
    public static Writer output = null;
    URLName url;
    public static String receiving_attachments="C:\\download";

    public MailfetchingPop3()
    {
        session = null;
        store = null;
    }

    public void setUserPass(String username, String password)
    {
        this.username = username;
        this.password = password;
    }

    public void connect()
    throws Exception
    {
        String SSL_FACTORY = "javax.net.ssl.SSLSocketFactory";
        Properties pop3Props = new Properties();
        pop3Props.setProperty("mail.pop3.socketFactory.class", SSL_FACTORY);
        pop3Props.setProperty("mail.pop3.socketFactory.fallback", "false");
        pop3Props.setProperty("mail.pop3.port", "995");
        pop3Props.setProperty("mail.pop3.socketFactory.port", "995");
        url = new URLName("pop3", "pop.gmail.com", 995, "", username, password);
        session = Session.getInstance(pop3Props, null);
        store = new POP3SSLStore(session, url);
        store.connect();
    }

    public void openFolder(String folderName)
    throws Exception
    {
        folder = (POP3Folder)store.getFolder(folderName);
        System.out.println((new StringBuilder("For test----")).append(folder.getParent().getFullName()).toString());
        if(folder == null)
            throw new Exception("Invalid folder");
        try
        {
            folder.open(2);
            System.out.println((new StringBuilder("Folder name----")).append(folder.getFullName()).toString());
        }
        catch(Exception ex)
        {
            System.out.println((new StringBuilder("Folder Opening Exception..")).append(ex).toString());
        }
    }

    public void closeFolder()
    throws Exception
    {
        folder.close(false);
    }

    public int getMessageCount()
    throws Exception
    {
        return folder.getMessageCount();
    }

    public int getNewMessageCount()
    throws Exception
    {
        return folder.getNewMessageCount();
    }

    public void disconnect()
    throws Exception
    {
        store.close();
    }

    public void printAllMessages()
    throws Exception
    {
        Message msgs[] = folder.getMessages();
        FetchProfile fp = new FetchProfile();
        folder.fetch(msgs, fp);
        for(int i = 0; i < msgs.length; i++)
            dumpEnvelope(msgs[i]);

    }



    public static int saveFile(File saveFile, Part part) throws Exception {

        BufferedOutputStream bos = new BufferedOutputStream( new FileOutputStream(saveFile) );

        byte[] buff = new byte[2048];
        InputStream is = part.getInputStream();
        int ret = 0, count = 0;
        while( (ret = is.read(buff)) > 0 ){
            bos.write(buff, 0, ret);
            count += ret;
        }
        bos.close();
        is.close();
        return count;
    }

    private static void dumpEnvelope(Message m) throws Exception
    {
        String body="";
        String path="";
        int size=0;
        Object content = m.getContent();
        if(content instanceof String){
            body = (String)content;
        }
        else if(content instanceof Multipart)
        {
            Multipart mp = (Multipart)content;
            for (int j=0; j < mp.getCount(); j++)
            {
                Part part = mp.getBodyPart(j);
                String disposition = part.getDisposition();
                //System.out.println("test disposition---->>"+disposition);
                if (disposition == null) {
                    // Check if plain
                    MimeBodyPart mbp = (MimeBodyPart)part;
                    if (mbp.isMimeType("text/plain")) {
                        body += mbp.getContent().toString();
                    }
                    else if (mbp.isMimeType("TEXT/HTML")) {
                        body += mbp.getContent().toString();
                    }
                    else {
                        //unknown
                    }
                } else if ((disposition != null) &&
                        (disposition.equals(Part.ATTACHMENT) || disposition.equals(Part.INLINE) || disposition.equals("ATTACHMENT") || disposition.equals("INLINE")) )
                {
                    // Check if plain
                    MimeBodyPart mbp = (MimeBodyPart)part;
                    if (mbp.isMimeType("text/plain")) {
                        body += (String)mbp.getContent();
                    }
                    else if (mbp.isMimeType("TEXT/HTML")) {
                        body += mbp.getContent().toString();
                    }
                    else {
                        File savedir = new File(receiving_attachments);
                        savedir.mkdirs();
                        File savefile = new File(savedir+"\\"+part.getFileName());
                        path = savefile.getAbsolutePath();
                        size = saveFile( savefile, part);

                    }
                }
            }
        }

    }
    public static void main(String args[])
    {
        try
        {
            MailfetchingPop3 gmail = new MailfetchingPop3();
            gmail.setUserPass("your_gmail_Id", "your_gmail_mail_id_password");
            gmail.connect();
            gmail.openFolder("INBOX");
            gmail.printAllMessages();
        }
        catch(Exception e)
        {
            e.printStackTrace();
            System.exit(-1);
        }
    }



}

To run this java class you need to download javamail.jar and activation.jar

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