JavaMail在javax.mail.search包中定义了一个用于创建搜索条件的SearchTerm类，应用程序创建SearchTerm类的实例对象后，就可以调用Folder.Search(SearchTerm st)方法搜索邮件夹中符合搜索条件的所有邮件。SearchTerm是一个抽象类，JavaMail提供了22个实现子类以帮助应用程序创建不同的搜索条件，这22个类可分为两大类型，如下所示：
1、用于创建逻辑组合关系的类
AND条件（AndTerm类）
OR条件（OrTerm类）
NOT条件（NotTerm类）
Comparison条件（ComparisonTerm类）
2、用于创建具体搜索条件的类
DATE条件（SentDateTerm、ReceivedDateTerm类）
CONTENT条件（BodyTerm类）
HEADER条件（FromStringTerm、RecipientStringTerm、SubjectTerm类等）
下面通过实现来说明以上类的用法及含义：
1、搜索发件人为“智联招聘“，而且邮件正文包含“Java工程师“的所有邮件
SearchTerm andTerm = new AndTerm(
new FromStringTerm("智联招聘"),
new BodyTerm("java工程师"));
Message[] messages = folder.search(andTerm);
2、搜索发件人为“智联招聘“或主题包含“最新职位信息“的所有邮件
SearchTerm orTerm = new OrTerm(
new FromStringTerm("智联招聘"),
new SubjectTerm("最新职位信息"));
Message[] messages = folder.search(orTerm);3、搜索发件人不包含“智联招聘“所有的邮件
SearchTerm notTerm = new NotTerm(new FromStringTerm("智联招聘"));
Message[] messages = folder.search(notTerm);4、搜索周一到今天收到的的所有邮件
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.DAY_OF_WEEK, calendar.get(Calendar.DAY_OF_WEEK - (Calendar.DAY_OF_WEEK - 1)) - 1);
Date mondayDate = calendar.getTime();
SearchTerm comparisonTermGe = new SentDateTerm(ComparisonTerm.GE, mondayDate);
SearchTerm comparisonTermLe = new SentDateTerm(ComparisonTerm.LE, new Date());
SearchTerm comparisonAndTerm = new AndTerm(comparisonTermGe, comparisonTermLe);
Message[] messages = folder.search(comparisonAndTerm);5、搜索大于或等于100KB的所有邮件
int mailSize = 1024 * 100;
SearchTerm intComparisonTerm = new SizeTerm(IntegerComparisonTerm.GE, mailSize);
Message[] messages = folder.search(intComparisonTerm);ComparisonTerm类常用于日期和数字比较中，它使用六个常量EQ（＝）、GE（>=）、GT（>）、LE（<=）、LT（<）、NE（!=）来表示六种不同的比较操作。
完整代码：
package org.yangxin.study.jm;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.Calendar;
import java.util.Date;
import java.util.Properties;
import javax.mail.Flags.Flag;
import javax.mail.Folder;
import javax.mail.Message;
import javax.mail.Session;
import javax.mail.Store;
import javax.mail.URLName;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeUtility;
import javax.mail.search.AndTerm;
import javax.mail.search.BodyTerm;
import javax.mail.search.ComparisonTerm;
import javax.mail.search.FromStringTerm;
import javax.mail.search.IntegerComparisonTerm;
import javax.mail.search.NotTerm;
import javax.mail.search.OrTerm;
import javax.mail.search.SearchTerm;
import javax.mail.search.SentDateTerm;
import javax.mail.search.SizeTerm;
import javax.mail.search.SubjectTerm;
/**
* 搜索邮件
*/
public class SearchMailTest {
public static void main(String[] args) throws Exception {
Properties props = new Properties();
props.setProperty("mail.pop3.auth", "true");
Session session = Session.getInstance(props);
URLName url = new URLName("pop3", "pop3.163.com", 110, null, "xyang81@163.com", "yX546900873");
Store store = session.getStore(url);
store.connect();
// 得到收件箱
Folder folder = store.getFolder("INBOX");
// 以读写模式打开收件箱
folder.open(Folder.READ_WRITE);
Message[] messages = search(folder);
System.out.println("收件箱中共有:" + folder.getMessageCount() + "封邮件，搜索到" + messages.length + "封符合条件的邮件!");
// 解析邮件搜索到的邮件
POP3ReceiveMailTest.parseMessage(messages);
// 根据用户输入的条件搜索所有邮件,并提示用户是否删除
//searchDemo(folder);
folder.close(true);
store.close();
}
public static Message[] search(Folder folder) throws Exception {
// 搜索主题包含美食的邮件
String subject = "java培训";
SearchTerm subjectTerm = new SubjectTerm(subject);
// 搜索发件人包含支付宝的邮件
SearchTerm fromTerm = new FromStringTerm("支付宝");
// 搜索邮件内容包含"招聘"的邮件
SearchTerm bodyTerm = new BodyTerm("招聘");
// 搜索发件人不包含“智联招聘”的邮件
SearchTerm notTerm = new NotTerm(new FromStringTerm("智联招聘"));
// 搜索发件人为“智联招聘”，而且内容包含“Java工程师“的邮件
SearchTerm andTerm = new AndTerm(
new FromStringTerm("智联招聘"),
new BodyTerm("java工程师"));
// 搜索发件人为”智联招聘“或主题包含”最新职位信息“的邮件
SearchTerm orTerm = new OrTerm(
new FromStringTerm("智联招聘"),
new SubjectTerm("最新职位信息"));
// 搜索周一到今天收到的的所有邮件
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.DAY_OF_WEEK, calendar.get(Calendar.DAY_OF_WEEK - (Calendar.DAY_OF_WEEK - 1)) - 1);
Date mondayDate = calendar.getTime();
SearchTerm comparisonTermGe = new SentDateTerm(ComparisonTerm.GE, mondayDate);
SearchTerm comparisonTermLe = new SentDateTerm(ComparisonTerm.LE, new Date());
SearchTerm comparisonAndTerm = new AndTerm(comparisonTermGe, comparisonTermLe);
// 搜索大于或等100KB的所有邮件
int mailSize = 1024 * 100;
SearchTerm intComparisonTerm = new SizeTerm(IntegerComparisonTerm.GE, mailSize);
return folder.search(intComparisonTerm);
}
}实例：根据用户输入的收件人（email地址或姓名）和主题作为搜索条件，并提示用户是否删除搜索到的邮件？
/**
* 根据用户输入的收件人地址（包括email地址和姓名）和主题作为搜索条件，并提示用户是否删除搜索到的邮件
* @param from 收件人
* @param subject 主题
*/
public static void searchDemo(Folder folder) throws Exception {
String notifyMsg = "收件箱中一共有" + folder.getMessageCount() + "封邮件。请选择操作：\n";
notifyMsg += "1、输入收件人\n" + "2、输入主题\n" + "3、开始搜索\n" + "4、退出";
System.out.println(notifyMsg);
String from = null;
String subject = null;
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
String oper = reader.readLine().trim();
while(!(from != null && subject != null)) {
if ("4".equals(oper)) {
System.exit(0);
} else {
if ("1".equals(oper)) {
System.out.print("请输入收件人：");
from = reader.readLine();
} else if ("2".equals(oper)) {
System.out.print("请输入主题：");
subject = reader.readLine();
} else if ("3".equals(oper)) {
if (from == null || subject == null) {
System.out.println("未输入搜索条件，无法进行搜索！");
} else {
break;
}
}
}
System.out.print("请选择操作：");
oper = reader.readLine().trim();
}
System.out.println("\n系统正在根据搜索条件查询所有邮件，请稍候......\n");
// 根据输入的条件，创建SearchTerm实例对象
SearchTerm orTerm = new OrTerm(
new FromStringTerm(from),
new SubjectTerm(subject)
);
// 根据搜索条件得到搜索到的邮件列表
Message[] messages = folder.search(orTerm);
System.out.println("共搜索到" + messages.length + "封满足搜索条件的邮件！\n\n请选择操作：1、查看邮件\t 2、删除所有邮件");
String deleteQuestion = "是否要删除搜索到的邮件?(yes/no)";
String searchResultOper = reader.readLine();
if ("1".equals(searchResultOper)) {
for (Message message : messages) {
MimeMessage msg = (MimeMessage) message;
String sub = POP3ReceiveMailTest.getSubject(msg);
System.out.println("开始查看第" + msg.getMessageNumber() + "封邮件...");
System.out.println("主题: " + sub);
System.out.println("发件人: " + POP3ReceiveMailTest.getFrom(msg));
System.out.println("收件人：" + POP3ReceiveMailTest.getReceiveAddress(msg, null));
System.out.println("发送时间：" + POP3ReceiveMailTest.getSentDate(msg, null));
System.out.println(deleteQuestion);
String answer = reader.readLine();
if ("yes".equals(answer)) {
msg.setFlag(Flag.DELETED, true);
System.out.println("邮件[" + sub + "]删除成功!");
} else if ("no".equals(answer)) {
System.out.println("第" + msg.getMessageNumber() + "封邮件查看完成！");
} else if ("stop".equals(answer)) {
System.exit(0);
}
System.out.println();
}
} else {
System.out.println(deleteQuestion);
String answer = reader.readLine();
if ("yes".equals(answer)) {
for (Message message : messages) {
String sub = MimeUtility.decodeText(message.getSubject());
message.setFlag(Flag.DELETED, true);
System.out.println("邮件[" + sub + "]删除成功!");
}
}
}
}
