java使用javamail读取邮箱（收件箱为例）

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Properties;
import javax.mail.BodyPart;
import javax.mail.Flags;
import javax.mail.Folder;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Multipart;
import javax.mail.Part;
import javax.mail.Session;
import javax.mail.Store;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeUtility;

/**
 * @author yh
 * 
 */
public class ShowMail {

	private MimeMessage mimeMessage = null;
	private String saveAttachPath = ""; // 附件下载后的存放目录
	private StringBuffer bodyText = new StringBuffer(); // 存放邮件内容的StringBuffer对象
	private String dateFormat = "yy-MM-dd HH:mm"; // 默认的日前显示格式

	/**
	 * 构造函数,初始化一个MimeMessage对象
	 */
	public ShowMail() {
	}

	public ShowMail(MimeMessage mimeMessage) {
		this.mimeMessage = mimeMessage;
		System.out.println("创建一个ReceiveEmail对象....");
	}

	public void setMimeMessage(MimeMessage mimeMessage) {
		this.mimeMessage = mimeMessage;
		System.out.println("设置一个MimeMessage对象...");
	}

	/**
	 * 　*　获得发件人的地址和姓名 　
	 */
	public String getFrom() throws Exception {
		InternetAddress address[] = (InternetAddress[]) mimeMessage.getFrom();
		String from = address[0].getAddress();
		if (from == null) {
			from = "";
			System.out.println("无法知道发送者.");
		}
		String personal = address[0].getPersonal();

		if (personal == null) {
			personal = "";
			System.out.println("无法知道发送者的姓名.");
		}

		String fromAddr = null;
		if (personal != null || from != null) {
			fromAddr = personal + "<" + from + ">";
			System.out.println("发送者是：" + fromAddr);
		} else {
			System.out.println("无法获得发送者信息.");
		}
		return fromAddr;
	}

	/**
	 * 　*　获得邮件的收件人，抄送，和密送的地址和姓名，根据所传递的参数的不同
	 * 　*　"to"----收件人　"cc"---抄送人地址　"bcc"---密送人地址 　
	 */
	public String getMailAddress(String type) throws Exception {
		String mailAddr = "";
		String addType = type.toUpperCase();

		InternetAddress[] address = null;
		if (addType.equals("TO") || addType.equals("CC")
				|| addType.equals("BCC")) {

			if (addType.equals("TO")) {
				address = (InternetAddress[]) mimeMessage
						.getRecipients(Message.RecipientType.TO);
			} else if (addType.equals("CC")) {
				address = (InternetAddress[]) mimeMessage