我一直在尝试使用 JavaMail 插件在 JTable 中显示获取的电子邮件。但是，当我要求程序设置该值时，它永远不会这样做。我一直在 NetBeans 工作，这有什么帮助吗？ fetchMail 类查找服务器上的所有内容。 GUI 类用于显示表中的所有电子邮件以及创建邮件。
你可能会认为我已经像瓷器店里的公牛一样尝试过，我是 Java 新手，试图给自己一个挑战。任何帮助/建议将不胜感激
获取邮件:
package mail;
import java.util.*;
import java.io.*;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import javax.mail.*;
import javax.mail.internet.*;
import javax.mail.search.*;
import javax.activation.*;
public class fetchMail {
public void fetch(String username, String pass, String search) {
MessagesTableModel tableModel = new MessagesTableModel();
String complete;
DateFormat df = new SimpleDateFormat("dd/MM/yyyy");
gui gui = new gui();
// SUBSTITUTE YOUR ISP's POP3 SERVER HERE!!!
String host = "imap.gmail.com";
// SUBSTITUTE YOUR USERNAME AND PASSWORD TO ACCESS E-MAIL HERE!!!
String user = username;
String password = pass;
// SUBSTITUTE YOUR SUBJECT SUBSTRING TO SEARCH HERE!!!
String subjectSubstringToSearch = search;
// Get a session. Use a blank Properties object.
Session session = Session.getInstance(new Properties());
Properties props = System.getProperties();
props.setProperty("mail.store.protocol", "imaps");
props.setProperty("mail.imap.socketFactory.class",
"javax.net.ssl.SSLSocketFactory");
props.setProperty("mail.imap.socketFactory.fallback", "false");
try {
// Get a Store object
Store store = session.getStore("imaps");
store.connect(host, user, password);
// Get "INBOX"
Folder fldr = store.getFolder("INBOX");
fldr.open(Folder.READ_WRITE);
int count = fldr.getMessageCount();
System.out.println(count + " total messages");
// Message numebers start at 1
for (int i = 1; i <= count; i++) {
// Get a message by its sequence number
Message m = fldr.getMessage(i);
// Get some headers
Date date = m.getSentDate();
int pos = i - 1;
String d = df.format(date);
Address[] from = m.getFrom();
String subj = m.getSubject();
String mimeType = m.getContentType();
complete = date + "\t" + from[0] + "\t"
+ subj + "\t" + mimeType;
//tableModel.setMessages(m);
gui.setDate(d, pos);
// System.out.println(d + " " + i);
}
// Search for e-mails by some subject substring
String pattern = subjectSubstringToSearch;
SubjectTerm st = new SubjectTerm(pattern);
// Get some message references
Message[] found = fldr.search(st);
System.out.println(found.length
+ " messages matched Subject pattern \""
+ pattern + "\"");
for (int i = 0; i < found.length; i++) {
Message m = found[i];
// Get some headers
Date date = m.getSentDate();
Address[] from = m.getFrom();
String subj = m.getSubject();
String mimeType = m.getContentType();
//System.out.println(date + "\t" + from[0] + "\t" +
// subj + "\t" + mimeType);
Object o = m.getContent();
if (o instanceof String) {
// System.out.println("**This is a String Message**");
// System.out.println((String)o);
} else if (o instanceof Multipart) {
// System.out.print("**This is a Multipart Message. ");
Multipart mp = (Multipart) o;
int count3 = mp.getCount();
// System.out.println("It has " + count3 +
// " BodyParts in it**");
for (int j = 0; j < count3; j++) {
// Part are numbered starting at 0
BodyPart b = mp.getBodyPart(j);
String mimeType2 = b.getContentType();
// System.out.println( "BodyPart " + (j + 1) +
// " is of MimeType " + mimeType);
Object o2 = b.getContent();
if (o2 instanceof String) {
// System.out.println("**This is a String BodyPart**");
// System.out.println((String)o2);
} else if (o2 instanceof Multipart) {
// System.out.print(
// "**This BodyPart is a nested Multipart. ");
Multipart mp2 = (Multipart) o2;
int count2 = mp2.getCount();
// System.out.println("It has " + count2 +
// "further BodyParts in it**");
} else if (o2 instanceof InputStream) {
// System.out.println(
// "**This is an InputStream BodyPart**");
}
} //End of for
} else if (o instanceof InputStream) {
// System.out.println("**This is an InputStream message**");
InputStream is = (InputStream) o;
// Assumes character content (not binary images)
int c;
while ((c = is.read()) != -1) {
// System.out.write(c);
}
}
// Uncomment to set "delete" flag on the message
//m.setFlag(Flags.Flag.DELETED,true);
} //End of for
// "true" actually deletes flagged messages from folder
fldr.close(true);
store.close();
} catch (MessagingException mex) {
// Prints all nested (chained) exceptions as well
mex.printStackTrace();
} catch (IOException ioex) {
ioex.printStackTrace();
}
}
}
图形用户界面:
/**
* gui.java
*
* Created on 13-May-2010, 18:29:30
*/
package mail;
import java.text.DateFormat;
import java.text.FieldPosition;
import java.text.ParsePosition;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Vector;
import javax.mail.Address;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.ListSelectionModel;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import javax.swing.event.TableModelListener;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableModel;
public class gui extends javax.swing.JFrame {
private MessagesTableModel tableModel;
// Table listing messages.
private JTable table;
String date;
/** Creates new form gui */
public gui() {
initComponents();
}
@SuppressWarnings("unchecked")
private void initComponents() {
recieve = new javax.swing.JButton();
jButton1 = new javax.swing.JButton();
jScrollPane1 = new javax.swing.JScrollPane();
inboxTable = new javax.swing.JTable();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
recieve.setText("Receve");
recieve.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
recieveActionPerformed(evt);
}
});
jButton1.setText("new");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
inboxTable.setModel(new javax.swing.table.DefaultTableModel(
new Object[][]{
{null, null, null},
{null, null, null},
{null, null, null},
{null, null, null}
},
new String[]{
"Date", "subject", "sender"
}) {
Class[] types = new Class[]{
java.lang.String.class, java.lang.String.class, java.lang.String.class
};
public Class getColumnClass(int columnIndex) {
return types[columnIndex];
}
});
jScrollPane1.setViewportView(inboxTable);
inboxTable.getColumnModel().getColumn(0).setResizable(false);
inboxTable.getColumnModel().getColumn(1).setResizable(false);
inboxTable.getColumnModel().getColumn(2).setResizable(false);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING).addGroup(layout.createSequentialGroup().addGap(39, 39, 39).addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING).addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 558, javax.swing.GroupLayout.PREFERRED_SIZE).addGroup(layout.createSequentialGroup().addComponent(recieve).addGap(18, 18, 18).addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 75, javax.swing.GroupLayout.PREFERRED_SIZE))).addGap(73, 73, 73)));
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING).addGroup(layout.createSequentialGroup().addGap(31, 31, 31).addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE).addComponent(recieve).addComponent(jButton1)).addGap(18, 18, 18).addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 258, javax.swing.GroupLayout.PREFERRED_SIZE).addContainerGap(179, Short.MAX_VALUE)));
pack();
}// </editor-fold>
private void recieveActionPerformed(java.awt.event.ActionEvent evt) {
fetchMail fetch = new fetchMail();
fetch.fetch("email goes here, password goes here, search goes here");
}
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
createMail create = new createMail();
centerW center = new centerW();
//create.attVis();
center.center(create);
create.setVisible(true);
}
public void setDate(String Date, int pos) {
//pos = pos + 1;
String[] s = new String[5];
s[pos] = Date;
inboxTable.setValueAt(Date, pos, 0);
}
public String getDate() {
return date;
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new gui().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JTable inboxTable;
private javax.swing.JButton jButton1;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JButton recieve;
// End of variables declaration
}
最佳答案
However when I ask the program to set the value it never does.
好吧，我不知道这意味着什么。
你需要退后一步，简化问题。您的程序正在尝试做两件事:
a) 使用 JavaMail 阅读电子邮件 b) 在 JTable 中显示电子邮件信息
根据您的问题，我无法判断问题是“a”还是“b”。
因此，如果问题是 a)，那么您需要创建一个简单的程序，使用一堆 System.out.println(...) 来显示从电子邮件查询返回的数据。
如果问题是 b)，那么您首先需要学习如何使用硬编码的“电子邮件数据”创建表
一旦你分别解决了问题a和b，你就把它们放在一起，你就得到了一个解决方案。
您发布的代码不可执行，因此我们无法真正帮助您。如果您需要更多帮助，请发布您的SSCCE 。
关于java - 在 JTable (Java Swing) 中显示电子邮件，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/2841131/