使用javamail和IMAP的Google App Engine（GAE）message.getContent（）不起作用 [英] Google App Engine (GAE) message.getContent() using javamail and IMAP not works

问题描述

我有好几天试图通过Google App Engine项目上的IMAP获取消息的内容。

我设法提取所有其他信息，但提取内容跳转出错信息（即使调用message.getContent.tostring（）也不工作，我尝试了MultiPart）。

我从一个普通项目（不是GAE和使用javamail.1.4.7）执行相同的操作，消息的内容完美显示。 b
$ b

这是GAE项目的代码：

  import java.util.Properties; 
 import java.util.logging.Logger; 
导入javax.mail.Session; 
 import java.io.IOException; 
 import javax.mail.Authenticator; 
 import javax.mail.Folder; 
 import javax.mail.Message; 
 import javax.mail.PasswordAuthentication; 
 import javax.mail.Store; 
 import javax.servlet.http。*; 
 
 @SuppressWarnings（serial）
 public class nuevo extends HttpServlet {
 
 private String User; 
私人字符串通行证; 
 
 private static final Logger log = Logger.getLogger（nuevo.class 
 .getName（））; 
 
 public void doGet（HttpServletRequest req，HttpServletResponse resp）
抛出IOException {
 
 User =User; 
 Pass =Pass; 
 
 LlamaIMAP（resp）; 
 
 
 $ b public void LlamaIMAP（HttpServletResponse resp）{
 
属性props = System.getProperties（）; 
 props.setProperty（mail.store.protocol，imaps）; 
 props.put（mail.imap.host，imap.gmail.com）; 
 props.put（mail.imap.user，User）; 
 props.put（mail.imap.socketFactory，993）; 
 props.put（mail.imap.socketFactory.class，
javax.net.ssl.SSLSocketFactory）; 
 props.put（mail.imap.port，993）; 
 Session session = Session.getDefaultInstance（props，
 new Authenticator（）{
 @Override 
 protected PasswordAuthentication getPasswordAuthentication（）{
 return new PasswordAuthentication（User，Pass） ; 
} 
}）; 
尝试{
 Store store = session.getStore（imap）; 
 store.connect（imap.gmail.com，993，User，Pass）; 
文件夹fldr = store.getFolder（Inbox）; 
 fldr.open（Folder.HOLDS_MESSAGES）; 
 // HOLDS_MESSAGES）; 
 Message [] ar = fldr.getMessages（）; 
 int count = fldr.getMessageCount（）; 
 resp.getWriter（）。println（count）; 
 resp.getWriter（）。println（ar [0] .getAllRecipients（）[0] .toString（））; 
 resp.getWriter（）。println（ar [0] .getFrom（）[0] .toString（））; 
 resp.getWriter（）。println（ar [0] .getSentDate（）。toString（））; 
 resp.getWriter（）。println（ar [0] .getSubject（））; 
 
 resp.getWriter（）。println（ar [0] .getContent（）。toString（））; 
 
} catch（Exception exc）{
 try {
 resp.getWriter（）。println（exc +error）; 
} catch（IOException e）{
 // TODO自动生成的catch块
 e.printStackTrace（）; 
} 
} 
 
} 
} 
  

解决方案

我设法修复它。

只需要将这几行添加到appengine-web.xml配置文件：

 < class-loader-config> 
< priority-specifier filename =imap.jar/> 
< priority-specifier filename =gimap.jar/> 
< priority-specifier filename =dsn.jar/> 
< priority-specifier filename =mailapi.jar/> 
< / class-loader-config> 
  

谢谢。

I have several days trying to get the contents of a message through IMAP on a Google App Engine Project.

I managed to extract all the other information, but to extract the contents of jumps me an error message (not work even invoking message.getContent.tostring(), I've tried as MultiPart).

I perform the same action from a normal project , (not GAE and using javamail.1.4.7), the content of the messages shown perfectly.

This is the code of GAE project:

    import java.util.Properties;
import java.util.logging.Logger;
import javax.mail.Session;
import java.io.IOException;
import javax.mail.Authenticator;
import javax.mail.Folder;
import javax.mail.Message;
import javax.mail.PasswordAuthentication;
import javax.mail.Store;
import javax.servlet.http.*;

@SuppressWarnings("serial")
public class nuevo extends HttpServlet {

    private String User;
    private String Pass;

    private static final Logger log = Logger.getLogger(nuevo.class
            .getName());

    public void doGet(HttpServletRequest req, HttpServletResponse resp)
            throws IOException {

        User = "User";
        Pass = "Pass";

        LlamaIMAP(resp);

    }

    public void LlamaIMAP(HttpServletResponse resp) {

        Properties props = System.getProperties();
        props.setProperty("mail.store.protocol", "imaps");
        props.put("mail.imap.host", "imap.gmail.com");
        props.put("mail.imap.user", User);
        props.put("mail.imap.socketFactory", 993);
        props.put("mail.imap.socketFactory.class",
                "javax.net.ssl.SSLSocketFactory");
        props.put("mail.imap.port", 993);
        Session session = Session.getDefaultInstance(props,
                new Authenticator() {
                    @Override
                    protected PasswordAuthentication getPasswordAuthentication() {
                        return new PasswordAuthentication(User, Pass);
                    }
                });
        try {
            Store store = session.getStore("imap");
            store.connect("imap.gmail.com", 993, User, Pass);
            Folder fldr = store.getFolder("Inbox");
            fldr.open(Folder.HOLDS_MESSAGES);
            // HOLDS_MESSAGES);
            Message[] ar = fldr.getMessages();
            int count = fldr.getMessageCount();
            resp.getWriter().println(count);
            resp.getWriter().println(ar[0].getAllRecipients()[0].toString());
            resp.getWriter().println(ar[0].getFrom()[0].toString());
            resp.getWriter().println(ar[0].getSentDate().toString());
            resp.getWriter().println(ar[0].getSubject());

            resp.getWriter().println(ar[0].getContent().toString());

        } catch (Exception exc) {
            try {
                resp.getWriter().println(exc + "error");
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }

    }
} 

解决方案

I managed to fix it.

Only you need to add this lines to the appengine-web.xml configuration file:

<class-loader-config>    
       <priority-specifier filename="imap.jar"/>   
       <priority-specifier filename="gimap.jar"/>    
       <priority-specifier filename="dsn.jar"/>    
       <priority-specifier filename="mailapi.jar"/>    
 </class-loader-config>

Thanks.

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