有没有一种方法可以用Java API for KML (JAK)将图像文件直接添加到kmz文件中？我可以很顺利地创建一个kml文件，但我想只嵌入一个资源（比如一个带有一些图片文件的图片文件夹），但marshalAsKmz方法只接受Kml对象作为附加文件，所以我想不出如何只包含额外的图片。
我在一个项目上使用JAK已经一年多了。我用它来创建KML，然后我把它作为普通的KML（而不是KMZ）。我创建了一个单独的实用类，使用Java SE'Zip'类来手动创建KMZ。它工作得很好。一个KMZ不过是一个.zip压缩包，它包含一个.kml文件和0个或更多的资源文件（如图像等）。唯一不同的是，当你输出文件时，你把它命名为.kmz而不是.zip。在KML文件中 <Style> 定义，参考你的资源文件与KML文件本身的相对路径。KML文件被认为是在KMZ档案的 "根"。如果你的资源文件也位于KMZ的根部（.zip），那么你不需要路径，只需要文件名。
编辑：我居然忘了我删除了中间文件的位置，但我想说的是，如果你的资源文件也位于KMZ的根部（.zip），那么你不需要路径，只需要文件名。 其实我忘了我去掉了JAK的中间步骤。Kml 对象到一个文件，然后再将其压缩。我下面的实用方法将把 Kml 的对象直接到 ZipOutputStream.
这是我创建的一个实用类，就是为了做我所描述的事情。我把它贴在这里，是希望有人能贴出一个只用JAK的替代解决方案，这样我就可以在将来把这个代码退掉。现在，这个可以满足你的要求。
注意：如果你不使用slf4j、Apache Commons Lang或Commons IO，那么只需对代码做一些调整，用你自己的代码重新overeplace这些位。很明显，这段代码需要JAK库。
package com.jimtough;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Collections;
import java.util.List;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
import org.apache.commons.io.IOUtils;
import org.apache.commons.lang.Validate;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import de.micromata.opengis.kml.v_2_2_0.Kml;
/**
* Uses the classes in java.util.zip to package a KML file and its
* supplementary files as a ZIP-compressed KMZ file.
*
* @author JTOUGH
*/
public final class KMZPackager {
private final static Logger logger =
LoggerFactory.getLogger(KMZPackager.class);
/**
* Container for data that represents a single entry that will be added
* to a compressed archive.
* @author JTOUGH
*/
public static abstract class DataSource {
protected String archivedFileName;
/**
* Write the contents of this data source to the supplied
* zip output stream.
*
* @param zipOutputStream
* @throws IOException
*/
public abstract void writeToStream(ZipOutputStream zipOutputStream)
throws IOException;
}
/**
* Container for data that represents a single file that will be added
* to a compressed archive.
* @author JTOUGH
*/
public static final class FileDataSource extends DataSource {
private File sourceFile;
/**
* Constructor
*
* @param sourceFile Actual file that will be added to the
* compressed archive.
* @param archivedFileName Name that will be assigned to the compressed
* file within the archive. Caller must ensure that this value is
* unique within the archive otherwise an exception will be thrown
* when a name clash occurs during creation of the archive.
* This string must be non-null and non-empty. Any forward-slash
* characters in the string will be treated as directory separators
* when the KMZ/ZIP archive is created.
* @throws IllegalArgumentException If either of these parameters
* is a null reference
*/
public FileDataSource(
File sourceFile,
String archivedFileName)
throws IllegalArgumentException {
Validate.notNull(sourceFile);
Validate.notEmpty(archivedFileName);
this.sourceFile = sourceFile;
this.archivedFileName = archivedFileName;
}
@Override
public void writeToStream(ZipOutputStream zipOutputStream)
throws IOException {
Validate.notNull(zipOutputStream);
// Check that the file exists, and throw an appropriate exception
// before reading it
if (!sourceFile.exists()) {
throw new IllegalArgumentException(
"File referenced in parameter [" +
sourceFile.getAbsolutePath() + "] does not exist");
}
FileInputStream fis = new FileInputStream(sourceFile);
if (logger.isDebugEnabled()) {
logger.debug("Adding file to KMZ archive" +
" | archive name: " + archivedFileName +
" | original name: " +
sourceFile.getCanonicalPath());
}
// Mark the start of this new file in the ZIP stream
ZipEntry entry = new ZipEntry(archivedFileName);
zipOutputStream.putNextEntry(entry);
// Use the Apache commons-io library to do a buffered
// stream-to-stream copy
try {
IOUtils.copy(fis, zipOutputStream);
} finally {
fis.close();
}
}
}
/**
* Container for a single JAK Kml object that will be marshalled
* directly to a compressed KMZ archive as it is created
* @author JTOUGH
*/
public static final class KMLDataSource extends DataSource {
private Kml kml;
/**
* Constructor
*
* @param kml JAK Kml object that will be marshalled directly to the
* compressed archive.
* @param archivedFileName Name that will be assigned to the compressed
* file within the archive. Caller must ensure that this value is
* unique within the archive otherwise an exception will be thrown
* when a name clash occurs during creation of the archive.
* This string must be non-null and non-empty. Any forward-slash
* characters in the string will be treated as directory separators
* when the KMZ/ZIP archive is created.
* @throws IllegalArgumentException If either of these parameters
* is a null reference
*/
public KMLDataSource(
Kml kml,
String archivedFileName)
throws IllegalArgumentException {
Validate.notNull(kml);
Validate.notEmpty(archivedFileName);
this.kml = kml;
this.archivedFileName = archivedFileName;
}
@Override
public void writeToStream(ZipOutputStream zipOutputStream) throws IOException {
Validate.notNull(zipOutputStream);
// Mark the start of this new file in the ZIP stream
ZipEntry entry = new ZipEntry(archivedFileName);
zipOutputStream.putNextEntry(entry);
// Marshal the Kml object directly to the ZipOutputStream
if (logger.isDebugEnabled()) {
logger.debug("Marshalling KML to KMZ archive" +
" | archive name: " + archivedFileName);
}
kml.marshal(zipOutputStream);
}
}
/**
* Container for a stream holding a Kml document. This will be written
* directly to a compressed KMZ archive as it is created.
*/
public static final class StreamDataSource extends DataSource {
private InputStream inputStream;
/**
* Constructor
*
* @param inputStream the inputStream holding the KML text
* @param archivedFileName Name that will be assigned to the compressed
* file within the archive. Caller must ensure that this value is
* unique within the archive otherwise an exception will be thrown
* when a name clash occurs during creation of the archive.
* This string must be non-null and non-empty. Any forward-slash
* characters in the string will be treated as directory separators
* when the KMZ/ZIP archive is created.
* @throws IllegalArgumentException If either of these parameters
* is a null reference
*/
public StreamDataSource(
InputStream inputStream,
String archivedFileName)
throws IllegalArgumentException {
Validate.notNull(inputStream);
Validate.notEmpty(archivedFileName);
this.inputStream = inputStream;
this.archivedFileName = archivedFileName;
}
@Override
public void writeToStream(ZipOutputStream zipOutputStream) throws IOException {
Validate.notNull(zipOutputStream);
// Mark the start of this new file in the ZIP stream
ZipEntry entry = new ZipEntry(archivedFileName);
zipOutputStream.putNextEntry(entry);
// Use the Apache commons-io library to do a buffered
// stream-to-stream copy
if (logger.isDebugEnabled()) {
logger.debug("Copying KML from stream to KMZ archive" +
" | archive name: " + archivedFileName);
}
try {
IOUtils.copy(inputStream, zipOutputStream);
} finally {
inputStream.close();
}
}
}
/**
* Use ZIP compression to package a KML file and its supplementary files
* as a KMZ archive. The compressed archive will be written to the
* supplied output stream.
*
* @param os OutputStream to which the compressed archive will be written.
* This parameter must be a non-null reference to an OutputStream that
* is open for write operations.
* @param kmlDataSource KML to be added to the compressed archive.
* This parameter must not be null. The archivedFileName attribute must
* end with the .kml extension. The file is added to the compressed
* archive. The KMZ specification states that a KMZ archive must only
* contain a single KML file.
* @param supplementaryFileList List of file locations for supplementary
* files that will be included in the KMZ archive. A common example
* would be icons or image overlays that are referenced in the KML file.
* This parameter can be null or an empty list if there are no
* supplementary files to include in the KMZ. Each source that is included
* in the list must refer to an existing file that does NOT have the
* file extension '.kml'.
* @throws RuntimeException Thrown if anything unexpected occurs
* that prevents execution from continuing or if any of the stated
* conditions for the input parameters are violated
*/
public void packageAsKMZ(
OutputStream os,
DataSource kmlDataSource,
List<FileDataSource> supplementaryFileList)
throws RuntimeException {
ZipOutputStream zipOutputStream = null;
boolean isExceptionThrown = false;
Exception caughtException = null;
List<FileDataSource> supplFileList = supplementaryFileList;
try {
Validate.notNull(os, "os parameter cannot be null");
Validate.notNull(kmlDataSource,
"kmlFileDataSource parameter cannot be null");
// Treat a null parameter just like an empty list (which is OK)
if (supplFileList == null) {
supplFileList = Collections.emptyList();
}
if (logger.isDebugEnabled()) {
logger.debug(
"Creating KMZ archive" +
" | supplementary files: " + supplFileList.size());
}
// Create a buffered output stream for the new KMZ file
zipOutputStream = new ZipOutputStream(new BufferedOutputStream(os));
Validate.isTrue(
kmlDataSource.archivedFileName.endsWith(".kml"),
"KML archived file name must end with .kml");
kmlDataSource.writeToStream(zipOutputStream);
// Now process the list of supplementary files
if (logger.isDebugEnabled()) {
logger.debug("Adding supplementary files to KMZ archive" +
" | archive name: ");
}
for (FileDataSource ds : supplFileList) {
Validate.isTrue(
!ds.archivedFileName.endsWith(".kml"),
"Not legal to include .kml files in supplementary list");
ds.writeToStream(zipOutputStream);
}
// Close the output stream to complete the ZIP creation
zipOutputStream.flush();
zipOutputStream.close();
logger.info("KMZ archive created successfully");
} catch (IOException e) {
isExceptionThrown = true;
caughtException = e;
logger.error("IOException while creating ZIP stream");
} catch (IllegalArgumentException e) {
isExceptionThrown = true;
caughtException = e;
} catch (RuntimeException e) {
isExceptionThrown = true;
caughtException = e;
} finally {
if (isExceptionThrown) {
try {
if (zipOutputStream != null) {
zipOutputStream.close();
}
} catch (IOException ioe) {
// Don't care
}
throw new RuntimeException(caughtException);
}
}
}
}
Java自带了一个默认的zip实用程序，你需要做的就是把你需要压缩的kml文件和图像文件列表一起传过来。这两个函数应该可以做到这一点。
private void exportAsKmz(Kml kmlFile,File[] files) throws IOException {
ZipOutputStream out = new ZipOutputStream(new FileOutputStream("example.kmz"));
addKmzFile(kmlFile,out,files);
out.close();
}
private void addKmzFile(Kml kmzFile, ZipOutputStream out,File[] files) throws IOException {
String fileName = "";
fileName = kmzFile.getFeature().getName();
if (!fileName.endsWith(".kml")) {
fileName += ".kml";
}
for(File file : files){
out.putNextEntry(new ZipEntry(file.getName()));
Files.copy(file.toPath(), out);
}
out.putNextEntry(new ZipEntry(URLEncoder.encode(fileName, "UTF-8")));
kmzFile.marshal(out);
out.closeEntry();
}