如何正确添加和删除 MIME 附件
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【中文标题】如何正确添加和删除 MIME 附件【英文标题】：How to Add and Remove MIME attachments correctly 【发布时间】：2019-04-25 03:59:48 【问题描述】：我正在向这样的文档添加 MIME 附件
try
var d = database.getView("Main").getFirstDocument()
var it = d.getFirstItem("Body")
var att:NotesEmbeddedObject = it.getEmbeddedObject("mydoc.docx")
var streamDOC:NotesStream = session.createStream()
streamDOC.setContents(att.getInputStream())
var newd;
newd = database.getView("NewD").getFirstDocument()
if(newd==null)
newd = database.createDocument()
newd.replaceItemValue("Form","Main")
var me = newd.createMIMEEntity("Body")
else
var me = newd.getMIMEEntity("Body")
var filename = "test.pdf"
var mc = me.createChildEntity();
var he = mc.createHeader("Content-Disposition")
he.setHeaderVal("attachment; filename=\"" + filename + "\"");
he = mc.createHeader("Content-ID");
he.setHeaderVal( "<" + filename + ">" );
mc.setContentFromBytes(streamDOC, "application/vnd.openxmlformats-officedocument.wordprocessingml.document", NotesMIMEEntity.ENC_IDENTITY_8BIT);
newd.save()
print("success")
catch(e)
print("fail " + e)
我提供了一个删除按钮
var eo = nd.getDocument().getAttachment(att)
eo.remove()
nd.save()
附件已从文档中删除，在 Ytria 中，我可以看到 $FILE 项目已删除，但 BODY 项目未删除。这样做的问题是，如果我在同一个文档中添加一个新附件，我之前删除的所有附件都会回来
这是删除附件之前文档的外观。
不幸的是，这里的文件大小为 0Kb，因为我使用了错误的屏幕截图。从一开始所有的 $File 项目都有正确的大小
这是我删除附件后文档的外观（使用上面的脚本）
这是我删除附件后添加一个附件（使用上面的脚本）后文档的样子
添加或删除附件时我做错了什么吗？ （看 脚本） Body 字段是否有“商店”似乎无关紧要 内容为 MIME”选项设置与否 另请参阅此问题 How to Add and Remove attachments using MIME【问题讨论】：
【参考方案1】：如果您使用 MIME 方法来附加文件，为什么不使用 MIME 方法来删除它呢？
我使用自己的框架，因此以下代码可能会让您觉得事情过于复杂，但希望您能明白其中的要点：
我有一个枚举，可以帮助我浏览各种 MIME 类型。在这种情况下，您正在处理ATTACHMENT：
public enum MimeContentType
ATTACHMENT("attachment")
@Override
public boolean matches(String[] headers)
int score = 0;
for (String header : headers)
if (header.startsWith("Content-Disposition"))
score++;
if (header.contains("attachment"))
score++;
if (header.contains("filename"))
score++;
if (score == 3)
return true;
return false;
,
TEXT("text"),
TEXT_html("text/html"),
TEXT_PLAIN("text/plain");
private final String type;
private MimeContentType(String type)
this.type = type;
public boolean matches(String[] headers)
for (String header : headers)
if (header.startsWith("Content-Type") && header.contains(type))
return true;
return false;
然后是一些辅助类：
@FunctionalInterface
public interface ThrowableConsumer<T> extends Consumer<T>
@Override
default void accept(final T t)
try
acceptOrThrow(t);
catch (final Throwable e)
throw new RuntimeException(e);
void acceptOrThrow(T t) throws Throwable;
@FunctionalInterface
public interface ThrowableFunction<T, R> extends Function<T, R>
@Override
default R apply(T t)
try
return applyOrThrow(t);
catch (final Throwable e)
throw new RuntimeException(e);
R applyOrThrow(T t) throws Throwable;
@FunctionalInterface
public interface ThrowablePredicate<T> extends Predicate<T>
@Override
default boolean test(T t)
try
return testOrThrow(t);
catch (final Throwable e)
throw new RuntimeException(e);
boolean testOrThrow(T t) throws Throwable;
@FunctionalInterface
public interface ThrowableSupplier<T> extends Supplier<T>
@Override
default T get()
try
return getOrThrow();
catch (final Throwable e)
throw new RuntimeException(e);
T getOrThrow() throws Throwable;
public enum DominoUtil
;
private static final Vector<String> MIME_FILTERED_HEADERS = new Vector<>();
static
MIME_FILTERED_HEADERS.add("Content-Type");
MIME_FILTERED_HEADERS.add("Content-Disposition");
public static List<MIMEEntity> getMimeEntitiesByContentType(MIMEEntity entity,
MimeContentType contentType) throws NotesException
Objects.requireNonNull(entity, "Entity cannot be null");
Objects.requireNonNull(contentType, "Content type cannot be null");
List<MIMEEntity> subentities = new ArrayList<>();
MIMEEntity nextEntity = null;
try
nextEntity = entity.getNextEntity();
while (nextEntity != null)
String[] entityFilteredHeaders = nextEntity
.getSomeHeaders(MIME_FILTERED_HEADERS, true)
.split("\\n");
if (contentType.matches(entityFilteredHeaders))
subentities.add(nextEntity);
nextEntity = nextEntity.getNextEntity();
finally
DominoUtil.recycle(nextEntity);
return subentities;
public final static MIMEEntity getMimeEntity(Document doc, String itemName,
boolean createOnFail) throws NotesException
if (itemName == null)
throw new NullPointerException("Invalid MIME entity item name");
MIMEEntity mimeEntity = doc.getMIMEEntity(itemName);
if (mimeEntity == null)
if (doc.hasItem(itemName))
doc.removeItem(itemName);
if (createOnFail)
mimeEntity = doc.createMIMEEntity(itemName);
return mimeEntity;
public static Optional<String> getMimeEntityAttachmentFilename(MIMEEntity entity) throws NotesException
Objects.requireNonNull(entity, "Entity cannot be null");
return getMimeEntityHeaderValAndParams(
entity, (ThrowablePredicate<MIMEHeader>) h -> h.getHeaderVal().equals("attachment"))
.map(s ->
Matcher m = Pattern.compile("filename=['\"]?([^'\"\\s]+)").matcher(s);
m.find();
return m.group(1);
);
public static Optional<String> getMimeEntityHeaderValAndParams(
MIMEEntity entity, Predicate<MIMEHeader> matcher) throws NotesException
Objects.requireNonNull(entity, "Entity cannot be null");
Objects.requireNonNull(matcher, "Matcher cannot be null");
Vector<?> headers = entity.getHeaderObjects();
try
return headers
.stream()
.map(MIMEHeader.class::cast)
.filter(matcher)
.map((ThrowableFunction<MIMEHeader, String>) MIMEHeader::getHeaderValAndParams)
.findFirst();
finally
recycle(headers);
public static void recycle(Base... bases)
for (Base base : bases)
if (base != null)
try
base.recycle();
catch (Exception e)
// Do nothing
public static void recycle(Collection<? extends Object> objs)
objs.stream()
.filter(o -> o instanceof Base)
.map(o -> (Base) o)
.forEach(DominoUtil::recycle);
最后是可以完成这项工作的方法：
public class Example
public static void yourEntryPoint()
try
// The last param is just a way to create an attachment from text
// You have InputStream to pass along obviously
addAttachment(doc, "Body", "fake1.txt", "this is fake text1");
addAttachment(doc, "Body", "fake2.txt", "this is fake text2");
addAttachment(doc, "Body", "fake3.txt", "this is fake text3");
removeAttachment(doc, "Body", "fake2.txt");
removeAttachment(doc, "Body", "fake3.txt");
catch (NotesException e)
throw new RuntimeException(e);
private static void addAttachment(Document doc, String itemName, String fileName, String data)
throws NotesException
MIMEEntity mimeEntity = null;
Stream stm = null;
try
mimeEntity = DominoUtil.getMimeEntity(doc, itemName, true);
Optional<MIMEEntity> optAttEntity = getAttachmentMimeEntity(mimeEntity, fileName);
MIMEEntity attachmentEntity = null;
if (optAttEntity.isPresent())
attachmentEntity = optAttEntity.get();
else
attachmentEntity = mimeEntity.createChildEntity();
MIMEHeader header = attachmentEntity.createHeader("Content-Disposition");
header.setHeaderValAndParams("attachment; filename=\"" + fileName + "\"");
stm = doc.getParentDatabase().getParent().createStream();
stm.writeText(data);
attachmentEntity.setContentFromBytes(stm,
"application/octet-stream",
MIMEEntity.ENC_IDENTITY_BINARY);
stm.close();
doc.closeMIMEEntities(true, itemName);
finally
DominoUtil.recycle(stm);
DominoUtil.recycle(mimeEntity);
private static void removeAttachment(Document doc, String itemName, String fileName)
throws NotesException
MIMEEntity mimeEntity = null;
try
// Get MIME entity
mimeEntity = DominoUtil.getMimeEntity(doc, itemName, true);
Optional<MIMEEntity> optAttEntity = getAttachmentMimeEntity(mimeEntity, fileName);
if (!optAttEntity.isPresent())
return;
optAttEntity.get().remove();
// Header cleaning on empty entity
if (mimeEntity.getFirstChildEntity() != null)
doc.closeMIMEEntities(true, itemName);
else
mimeEntity.remove();
finally
DominoUtil.recycle(mimeEntity);
private static Optional<MIMEEntity> getAttachmentMimeEntity(MIMEEntity root, String fileName)
throws NotesException
return DominoUtil
.getMimeEntitiesByContentType(root, MimeContentType.ATTACHMENT)
.stream()
.filter((ThrowablePredicate<MIMEEntity>) mime ->
Optional<String> opt = DominoUtil.getMimeEntityAttachmentFilename(mime);
return opt.isPresent() && opt.get().equals(fileName);
)
.findFirst();
【讨论】：
谢谢，这可能会有所帮助，但您的代码不完整 public static Map以上是关于如何正确添加和删除 MIME 附件的主要内容，如果未能解决你的问题，请参考以下文章
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