Author: onealj
Date: Tue Jun 20 07:28:14 2017
New Revision: 1799308
URL: http://svn.apache.org/viewvc?rev=1799308&view=rev
Log:
bug 57919: add functions to write and close a POIDocument, guaranteeing closure
of the output stream and document.
Modified:
poi/trunk/src/java/org/apache/poi/util/IOUtils.java
Modified: poi/trunk/src/java/org/apache/poi/util/IOUtils.java
URL:
http://svn.apache.org/viewvc/poi/trunk/src/java/org/apache/poi/util/IOUtils.java?rev=1799308&r1=1799307&r2=1799308&view=diff
==============================================================================
--- poi/trunk/src/java/org/apache/poi/util/IOUtils.java (original)
+++ poi/trunk/src/java/org/apache/poi/util/IOUtils.java Tue Jun 20 07:28:14 2017
@@ -19,6 +19,7 @@ package org.apache.poi.util;
import java.io.ByteArrayOutputStream;
import java.io.Closeable;
+import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
@@ -29,6 +30,7 @@ import java.util.zip.CRC32;
import java.util.zip.Checksum;
import org.apache.poi.EmptyFileException;
+import org.apache.poi.POIDocument;
public final class IOUtils {
private static final POILogger logger = POILogFactory.getLogger(
IOUtils.class );
@@ -187,6 +189,82 @@ public final class IOUtils {
}
}
}
+
+ /**
+ * Write a POI Document ({@link org.apache.poi.ss.usermodel.Workbook},
{@link org.apache.poi.sl.usermodel.SlideShow}, etc) to an output stream and
close the output stream.
+ * This will attempt to close the output stream at the end even if there
was a problem writing the document to the stream.
+ *
+ * If you are using Java 7 or higher, you may prefer to use a
try-with-resources statement instead.
+ * This function exists for Java 6 code.
+ *
+ * @param doc a writeable document to write to the output stream
+ * @param out the output stream that the document is written to
+ * @throws IOException
+ */
+ public static void write(POIDocument doc, OutputStream out) throws
IOException {
+ try {
+ doc.write(out);
+ } finally {
+ closeQuietly(out);
+ }
+ }
+
+ /**
+ * Write a POI Document ({@link org.apache.poi.ss.usermodel.Workbook},
{@link org.apache.poi.sl.usermodel.SlideShow}, etc) to an output stream and
close the output stream.
+ * This will attempt to close the output stream at the end even if there
was a problem writing the document to the stream.
+ * This will also attempt to close the document, even if an error occurred
while writing the document or closing the output stream.
+ *
+ * If you are using Java 7 or higher, you may prefer to use a
try-with-resources statement instead.
+ * This function exists for Java 6 code.
+ *
+ * @param doc a writeable and closeable document to write to the output
stream, then close
+ * @param out the output stream that the document is written to
+ * @throws IOException
+ */
+ public static void writeAndClose(POIDocument doc, OutputStream out) throws
IOException {
+ try {
+ write(doc, out);
+ } finally {
+ closeQuietly(doc);
+ }
+ }
+
+ /**
+ * Like {@link #writeAndClose(POIDocument, OutputStream)}, but for writing
to a File instead of an OutputStream.
+ * This will attempt to close the document, even if an error occurred
while writing the document.
+ *
+ * If you are using Java 7 or higher, you may prefer to use a
try-with-resources statement instead.
+ * This function exists for Java 6 code.
+ *
+ * @param doc a writeable and closeable document to write to the output
file, then close
+ * @param out the output file that the document is written to
+ * @throws IOException
+ */
+ public static void writeAndClose(POIDocument doc, File out) throws
IOException {
+ try {
+ doc.write(out);
+ } finally {
+ closeQuietly(doc);
+ }
+ }
+
+ /**
+ * Like {@link #write(POIDocument, File)}, but for writing a POI Document
in place (to the same file that it was opened from).
+ * This will attempt to close the document, even if an error occurred
while writing the document.
+ *
+ * If you are using Java 7 or higher, you may prefer to use a
try-with-resources statement instead.
+ * This function exists for Java 6 code.
+ *
+ * @param doc a writeable document to write in-place
+ * @throws IOException
+ */
+ public static void writeAndClose(POIDocument doc) throws IOException {
+ try {
+ doc.write();
+ } finally {
+ closeQuietly(doc);
+ }
+ }
/**
* Copies all the data from the given InputStream to the OutputStream. It
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