请问哪位知道James收邮件!!请指点!!!!感激不尽!!!!

[Frozencrown]

我现在是接收到了邮件,但是要修改部分Header,象标记已读.所在文件箱.是否要回执等字段
问:
1,是否能实现这个功能按此方法能否实现?请指点!!!!!感激不尽!!!!
连接协议部分如下:
Properties props = new Properties();
props.put("mail.user", user);
props.put("mail.host", host);
props.put("mail.debug", debug ? "true" : "false");
props.put("mail.store.protocol", "pop3");
props.put("mail.transport.protocol", "smtp");
session = Session.getInstance(props, this);
修改的时候:
msg.setHeader("read", "1");
出错信息如下:
javax.mail.IllegalWriteException: POP3 messages are read-only

at com.sun.mail.pop3.POP3Message.setHeader(POP3Message.java:274)

at com.norteksoft.oa.mail.bean.MailClient.readMail(MailClient.java:141)

at com.norteksoft.oa.mail.actions.ReadMailAction.execute(ReadMailAction.java:28)

at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:465)

at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274)

at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1422)

at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:505)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)

at com.norteksoft.oa.mail.util.EncodingFilter.doFilter(EncodingFilter.java:24)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:186)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)

at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)

at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)

at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)

at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198)

at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152)

at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)

at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)

at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)

at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)

at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)

at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)

at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)

at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)

at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)

at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)

at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929)

at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)

at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)

at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)

at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)

at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)

at java.lang.Thread.run(Thread.java:534)