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SitemapGen4j is an XML sitemap generator written in Java.
package com.redfin.sitemapgenerator;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Date;
import org.xml.sax.SAXException;
/**
* Builds a sitemap index, which points only to other sitemaps.
* @author Dan Fabulich
*
*/
public class SitemapIndexGenerator {
private final URL baseUrl;
private final File outFile;
private final boolean allowEmptyIndex;
private final ArrayList urls = new ArrayList();
private final int maxUrls;
private final W3CDateFormat dateFormat;
private final Date defaultLastMod;
private final boolean autoValidate;
/** Maximum 50,000 sitemaps per index allowed */
public static final int MAX_SITEMAPS_PER_INDEX = 50000;
/** Options to configure sitemap index generation */
public static class Options {
private URL baseUrl;
private File outFile;
private W3CDateFormat dateFormat = null;
private boolean allowEmptyIndex = false;
private int maxUrls = MAX_SITEMAPS_PER_INDEX;
private Date defaultLastMod = new Date();
private boolean autoValidate = false;
// TODO GZIP? Is that legal for a sitemap index?
/**Configures the generator with a base URL and destination to write the sitemap index file.
*
* @param baseUrl All URLs in the generated sitemap(s) should appear under this base URL
* @param outFile The sitemap index will be written out at this location
*/
public Options(URL baseUrl, File outFile) {
this.baseUrl = baseUrl;
this.outFile = outFile;
}
/**Configures the generator with a base URL and destination to write the sitemap index file.
*
* @param baseUrl All URLs in the generated sitemap(s) should appear under this base URL
* @param outFile The sitemap index will be written out at this location
*/
public Options(String baseUrl, File outFile) throws MalformedURLException {
this(new URL(baseUrl), outFile);
}
/** The date formatter, typically configured with a {@link W3CDateFormat.Pattern} and/or a time zone */
public Options dateFormat(W3CDateFormat dateFormat) {
this.dateFormat = dateFormat;
return this;
}
/**
* Permit writing an index that contains no URLs.
*
* @param allowEmptyIndex {@code true} if an empty index is permissible
* @return this instance, for chaining
*/
public Options allowEmptyIndex(boolean allowEmptyIndex) {
this.allowEmptyIndex = allowEmptyIndex;
return this;
}
/**
* The maximum number of sitemaps to allow per sitemap index; the default is the
* maximum allowed (1,000), but you can decrease it if you wish (for testing)
*/
Options maxUrls(int maxUrls) {
if (maxUrls > MAX_SITEMAPS_PER_INDEX) {
throw new RuntimeException("You can't have more than 1000 sitemaps per index");
}
this.maxUrls = maxUrls;
return this;
}
/**
* The default lastMod date for sitemap indexes; the default default is
* now, but you can pass in null to omit a lastMod entirely. We don't
* recommend this; Google may not like you as much.
*/
public Options defaultLastMod(Date defaultLastMod) {
this.defaultLastMod = defaultLastMod;
return this;
}
/**
* Validate the sitemap index automatically after writing it; this takes
* time
*/
public Options autoValidate(boolean autoValidate) {
this.autoValidate = autoValidate;
return this;
}
/** Constructs a sitemap index generator configured with the options you specified */
public SitemapIndexGenerator build() {
return new SitemapIndexGenerator(this);
}
}
/**Configures the generator with a base URL and destination to write the sitemap index file.
*
* @param baseUrl All URLs in the generated sitemap(s) should appear under this base URL
* @param outFile The sitemap index will be written out at this location
*/
public SitemapIndexGenerator(URL baseUrl, File outFile) {
this(new Options(baseUrl, outFile));
}
/**Configures the generator with a base URL and destination to write the sitemap index file.
*
* @param baseUrl All URLs in the generated sitemap(s) should appear under this base URL
* @param outFile The sitemap index will be written out at this location
*/
public SitemapIndexGenerator(String baseUrl, File outFile) throws MalformedURLException {
this(new Options(baseUrl, outFile));
}
private SitemapIndexGenerator(Options options) {
this.baseUrl = options.baseUrl;
this.outFile = options.outFile;
this.allowEmptyIndex = options.allowEmptyIndex;
this.maxUrls = options.maxUrls;
W3CDateFormat dateFormat = options.dateFormat;
if (dateFormat == null) dateFormat = new W3CDateFormat();
this.dateFormat = dateFormat;
this.defaultLastMod = options.defaultLastMod;
this.autoValidate = options.autoValidate;
}
/** Adds a single sitemap to the index */
public SitemapIndexGenerator addUrl(SitemapIndexUrl url) {
UrlUtils.checkUrl(url.url, baseUrl);
if (urls.size() >= maxUrls) {
throw new RuntimeException("More than " + maxUrls + " urls");
}
urls.add(url);
return this;
}
/** Add multiple sitemaps to the index */
public SitemapIndexGenerator addUrls(Iterable urls) {
for (SitemapIndexUrl url : urls) addUrl(url);
return this;
}
/** Add multiple sitemaps to the index */
public SitemapIndexGenerator addUrls(SitemapIndexUrl... urls) {
for (SitemapIndexUrl url : urls) addUrl(url);
return this;
}
/** Add multiple sitemaps to the index */
public SitemapIndexGenerator addUrls(String... urls) throws MalformedURLException {
for (String url : urls) addUrl(url);
return this;
}
/** Adds a single sitemap to the index */
public SitemapIndexGenerator addUrl(String url) throws MalformedURLException {
return addUrl(new SitemapIndexUrl(url));
}
/** Add multiple sitemaps to the index */
public SitemapIndexGenerator addUrls(URL... urls) {
for (URL url : urls) addUrl(url);
return this;
}
/** Adds a single sitemap to the index */
public SitemapIndexGenerator addUrl(URL url) {
return addUrl(new SitemapIndexUrl(url));
}
/** Adds a single sitemap to the index */
public SitemapIndexGenerator addUrl(URL url, Date lastMod) {
return addUrl(new SitemapIndexUrl(url, lastMod));
}
/** Adds a single sitemap to the index */
public SitemapIndexGenerator addUrl(String url, Date lastMod) throws MalformedURLException {
return addUrl(new SitemapIndexUrl(url, lastMod));
}
/** Add a numbered list of sitemaps to the index, e.g. "sitemap1.xml" "sitemap2.xml" "sitemap3.xml" etc.
*
* @param prefix the first part of the filename e.g. "sitemap"
* @param suffix the last part of the filename e.g. ".xml" or ".xml.gz"
* @param count the number of sitemaps (1-based)
*/
public SitemapIndexGenerator addUrls(String prefix, String suffix, int count) {
if (count == 0) {
try {
addUrl(new URL(baseUrl, prefix + suffix));
} catch (MalformedURLException e) {
throw new RuntimeException(e);
}
} else {
for (int i = 1; i <= count; i++) {
String fileName = prefix + i + suffix;
try {
addUrl(new URL(baseUrl, fileName));
} catch (MalformedURLException e) {
throw new RuntimeException(e);
}
}
}
return this;
}
/** Writes out the sitemap index */
public void write() {
if (!allowEmptyIndex && urls.isEmpty()) throw new RuntimeException("No URLs added, sitemap index would be empty; you must add some URLs with addUrls");
try {
// TODO gzip? is that legal for a sitemap index?
FileWriter out = new FileWriter(outFile);
writeSiteMap(out);
if (autoValidate) SitemapValidator.validateSitemapIndex(outFile);
} catch (IOException e) {
throw new RuntimeException("Problem writing sitemap index file " + outFile, e);
} catch (SAXException e) {
throw new RuntimeException("Problem validating sitemap index file (bug?)", e);
}
}
private void writeSiteMap(OutputStreamWriter out) throws IOException {
out.write("\n");
out.write("\n");
for (SitemapIndexUrl url : urls) {
out.write(" \n");
out.write(" ");
out.write(UrlUtils.escapeXml(url.url.toString()));
out.write(" \n");
Date lastMod = url.lastMod;
if (lastMod == null) lastMod = defaultLastMod;
if (lastMod != null) {
out.write(" ");
out.write(dateFormat.format(lastMod));
out.write(" \n");
}
out.write(" \n");
}
out.write(" ");
out.close();
}
}