如何使用MimeMultipart的JavaMail覆盖默认的唯一边界字符串并创建自己的边界？

问题描述

我有一个网络应用程序，我使用它需要一个特定的边界字符串（公司mime边界）。

我没有找到一种方法来覆盖MimeMultipart的默认行为，当我这样做时

Multipart mp = new MimeMultipart（）;

唯一的边界字符串总是由构造函数创建，我想覆盖此行为以拥有自己的边界字符串，但由于找不到任何API而无法执行此操作。

即使我在内容类型中设置它，它也不起作用并且创建一个唯一的边界字符串，因为MimeMultipart正在创建一个默认的边界字符串。

mimeMsg.setHeader（Content-Type，multipart / mixed; boundary =company mime boundary）;

任何人都可以建议/帮助我。

如何覆盖此默认行为？

解决方案

来自：

尝试将此属性设置为 true 然后使用

<$ p添加您自己的属性$ p> mimeMsg.setHeader（ 内容类型， ）;


我还没有实现它，但我相信它可以工作

更新

尝试对MimeMultipart类进行子类化并覆盖 getBoundaryMethod（）。请参阅下面的示例代码：

  import javax.activation.DataSource; 
 import javax.mail.MessagingException; 
 import javax.mail.internet.ContentType; 
 import javax.mail.internet.MimeMultipart; 
公共类MyMimeMultyPart扩展了MimeMultipart {
 / ** 
 *提供InputStream的DataSource。 
 * / 
 protected DataSource ds; 
 
 / ** 
 *表示数据是否已被解析。 
 * / 
 protected boolean parsed = true; 
 
私有ContentType类型; 
 
 public MyMimeMultyPart（DataSource dataSource）抛出MessagingException {
 super（dataSource）; 
} 
 
 public MyMimeMultyPart（String subtype）{
 type = new ContentType（multipart，subtype，null）; 
 type.setParameter（boundary，getBoundary（））; 
 contentType = type.toString（）; 
} 
 
 public MyMimeMultyPart（）{
 super（）; 
} 
 
 private static int part; 
 
 private synchronized static String getBoundary（）{
 int i; 
 synchronized（MimeMultipart.class）{
 i = part ++; 
} 
 StringBuffer buf = new StringBuffer（64）; 
 buf.append（---- = _ Part _）。append（i）.append（'_'）。append（（new Object（））。hashCode（））。append（'。'） .append（System.currentTimeMillis的（））; 
返回buf.toString（）; 
} 
} 
  

I have a web-app which I use which expects a specific boundary string like ("company mime boundary").

I did not find a way to override the default behavior of MimeMultipart, when I do

Multipart mp = new MimeMultipart();

A unique boundary string is always created by the constructor and I want to override this behavior to have my own boundary string, but unable to do so as I did not find any API.

Even if I set it in content-type, it does not work and creates a unique boundary string always as the MimeMultipart is creating a default one.

mimeMsg.setHeader("Content-Type","multipart/mixed;boundary="company mime boundary");

Can anyone please suggest/help me on this.

How to override this default behavior ?

解决方案

From javax.mail.Multipart :

Try setting this property to true and then add your own using

mimeMsg.setHeader("Content-Type","");

I have not implemented it, but I am confident it can work

update

Try sub-classing the MimeMultipart class and overwrite the getBoundaryMethod(). See some sample code below:

import javax.activation.DataSource;
import javax.mail.MessagingException;
import javax.mail.internet.ContentType;
import javax.mail.internet.MimeMultipart;
public class MyMimeMultyPart extends MimeMultipart {
    /**
     * DataSource that provides our InputStream.
     */
    protected DataSource ds;

    /**
     * Indicates if the data has been parsed.
     */
    protected boolean parsed = true;

    private ContentType type;

    public MyMimeMultyPart(DataSource dataSource) throws MessagingException {
        super(dataSource);
    }

    public MyMimeMultyPart(String subtype) {
        type = new ContentType("multipart", subtype, null);
        type.setParameter("boundary", getBoundary());
        contentType = type.toString();
    }

    public MyMimeMultyPart() {
        super();
    }

    private static int part;

    private synchronized static String getBoundary() {
        int i;
        synchronized (MimeMultipart.class) {
            i = part++;
        }
        StringBuffer buf = new StringBuffer(64);
        buf.append("----=_Part_").append(i).append('_').append((new Object()).hashCode()).append('.').append(System.currentTimeMillis());
        return buf.toString();
    }
}

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