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我在项目的开发过程中，发现Tomcat解压war 的一点例外。 现象如下：
使用ANT工具把web应用程序打包为war文件。然后把war文件放到tomcat的webapps，让tomcat自己解压。结果出现解压的web应用程序文件丢失。使用rar工具打开war文件。文件都齐全。怎么有这种现象呢？？查看tomcat的log文档。发现在解压war文档NullpointException.我升级tomcat到5.0还是出现这种现象。
jakarta-tomcat-catalina/catalina/src/share/org/apache/catalina/startup/HostConfig.java 解决方法： 我从tomcat网站下载了catalina 的原代码，进行分析。发现是在解压war文件出现input为null,而 input= jar.getInputStream(entry);然后提高tomcat的debug级别。可以在tomcat的log文档看到tomcat解压war文档的过程。发现如果某些文件名为???.txt,经检查发现原来这个文件的文件名为汉字。 噢！才发现war文件在解压的过程中无法处理汉字的文件名。（因为找不到文件名为???.txt的文件而导致null例外。原来这个文件是个注释文档），所以在使用ant把web应用程序打包为war文件，一定要把文件名为汉字的文件去掉。使用Forte for java的IDE工具把web应用程序打包为war文件会不包含这些文件名为汉字的文件。 下面是部分war文档解压的部分代码 代码采自jakarta.org 类HostConfig.java jakarta-tomcat-catalina/catalina/src/share/org/apache/catalina/startup/HostConfig.java 解决方法： 我从tomcat网站下载了catalina 的原代码，进行分析。发现是在解压war文件出现input为null,而 input= jar.getInputStream(entry);然后提高tomcat的debug级别。可以在tomcat的log文档看到tomcat解压war文档的过程。发现如果某些文件名为???.txt,经检查发现原来这个文件的文件名为汉字。 噢！才发现war文件在解压的过程中无法处理汉字的文件名。（因为找不到文件名为???.txt的文件而导致null例外。原来这个文件是个注释文档），所以在使用ant把web应用程序打包为war文件，一定要把文件名为汉字的文件去掉。使用Forte for java的IDE工具把web应用程序打包为war文件会不包含这些文件名为汉字的文件 。 下面是部分war文档解压的部分代码 代码采自jakarta.org 类HostConfig.java jakarta-tomcat-catalina/catalina/src/share/org/apache/catalina/startup/HostConfig.java
代码语言：javascript复制protected void deployWARs(File appBase, String[] files) {
for (int i = 0; i < files.length; i ) {
if (files[i].equalsIgnoreCase(“META-INF”))
continue;
if (files[i].equalsIgnoreCase(“WEB-INF”))
continue;
if (deployed.contains(files[i]))
continue;
File dir = new File(appBase, files[i]);
if (files[i].toLowerCase().endsWith(“.war”)) {
deployed.add(files[i]);
// Calculate the context path and make sure it is unique
String contextPath = “/” files[i];
int period = contextPath.lastIndexOf(“.”);
if (period >= 0)
contextPath = contextPath.substring(0, period);
if (contextPath.equals(“/ROOT”))
contextPath = “”;
if (host.findChild(contextPath) != null)
continue;
// Checking for a nested /META-INF/context.xml
JarFile jar = null;
JarEntry entry = null;
InputStream istream = null;
BufferedOutputStream ostream = null;
File xml = new File
(configBase, files[i].substring
(0, files[i].lastIndexOf(“.”)) “.xml”);
if (!xml.exists()) {
try {
jar = new JarFile(dir);
entry = jar.getJarEntry(“META-INF/context.xml”);
if (entry != null) {
istream = jar.getInputStream(entry);
ostream =
new BufferedOutputStream
(new FileOutputStream(xml), 1024);
byte buffer[] = new byte[1024];
while (true) {
int n = istream.read(buffer);
if (n < 0) {
break;
}
ostream.write(buffer, 0, n);
}
ostream.flush();
ostream.close();
ostream = null;
istream.close();
istream = null;
entry = null;
jar.close();
jar = null;
deployDescriptors(configBase(), configBase.list());
return;
}
} catch (Exception e) {
// Ignore and continue
if (ostream != null) {
try {
ostream.close();
} catch (Throwable t) {
;
}
ostream = null;
}
if (istream != null) {
try {
istream.close();
} catch (Throwable t) {
;
}
istream = null;
}
entry = null;
if (jar != null) {
try {
jar.close();
} catch (Throwable t) {
;
}
jar = null;
}
}
}
if (isUnpackWARs()) {
// Expand and deploy this application as a directory
log.debug(sm.getString(“hostConfig.expand”, files[i]));
URL url = null;
String path = null;
try {
url = new URL(“jar:file:”
dir.getCanonicalPath() “!/”);
path = ExpandWar.expand(host, url);
} catch (IOException e) {
// JAR decompression failure
log.warn(sm.getString
(“hostConfig.expand.error”, files[i]));
continue;
} catch (Throwable t) {
log.error(sm.getString
(“hostConfig.expand.error”, files[i]), t);
continue;
}
try {
if (path != null) {
url = new URL(“file:” path);
((Deployer) host).install(contextPath, url);
}
} catch (Throwable t) {
log.error(sm.getString
(“hostConfig.expand.error”, files[i]), t);
}
} else {
// Deploy the application in this WAR file
log.info(sm.getString(“hostConfig.deployJar”, files[i]));
try {
URL url = new URL(“file”, null,
dir.getCanonicalPath());
url = new URL(“jar:” url.toString() “!/”);
((Deployer) host).install(contextPath, url);
} catch (Throwable t) {
log.error(sm.getString(“hostConfig.deployJar.error”,
files[i]), t);
}
}
}
}
}类 ExpandWar.java jakarta-tomcat-catalina/catalina/src/share/org/apache/catalina/startup/ExpandWar.java
代码语言：javascript复制package org.apache.catalina.startup;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.IOException;
import java.net.JarURLConnection;
import java.net.URL;
import java.util.Enumeration;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import org.apache.catalina.Host;
import org.apache.catalina.Logger;
import org.apache.catalina.core.StandardHost;
import org.apache.catalina.util.StringManager;
/**
* Expand out a WAR in a Host‘s appBase.
*
* @author Craig R. McClanahan
* @author Remy Maucherat
* @author Glenn L. Nielsen
* @version $Revision: 1.4 $
*/
public class ExpandWar {
/**
* The string resources for this package.
*/
protected static final StringManager sm =
StringManager.getManager(Constants.Package);
/**
* Expand the WAR file found at the specified URL into an unpacked
* directory structure, and return the absolute pathname to the expanded
* directory.
*
* @param host Host war is being installed for
* @param war URL of the web application archive to be expanded
* (must start with “jar:”)
*
* @exception IllegalArgumentException if this is not a “jar:” URL
* @exception IOException if an input/output error was encountered
* during expansion
*/
public static String expand(Host host, URL war)
throws IOException {
int debug = 0;
Logger logger = host.getLogger();
if (host instanceof StandardHost) {
debug = ((StandardHost) host).getDebug();
}
// Calculate the directory name of the expanded directory
if (debug >= 1) {
logger.log(“expand(“ war.toString() “)”);
}
String pathname = war.toString().replace(‘\‘, ‘/‘);
if (pathname.endsWith(“!/”)) {
pathname = pathname.substring(0, pathname.length() – 2);
}
int period = pathname.lastIndexOf(‘.‘);
if (period >= pathname.length() – 4)
pathname = pathname.substring(0, period);
int slash = pathname.lastIndexOf(‘/‘);
if (slash >= 0) {
pathname = pathname.substring(slash 1);
}
if (debug >= 1) {
logger.log(” Proposed directory name: “ pathname);
}
return expand(host, war, pathname);
}
/**
* Expand the WAR file found at the specified URL into an unpacked
* directory structure, and return the absolute pathname to the expanded
* directory.
*
* @param host Host war is being installed for
* @param war URL of the web application archive to be expanded
* (must start with “jar:”)
* @param pathname Context path name for web application
*
* @exception IllegalArgumentException if this is not a “jar:” URL
* @exception IOException if an input/output error was encountered
* during expansion
*/
public static String expand(Host host, URL war, String pathname)
throws IOException {
int debug = 0;
Logger logger = host.getLogger();
if (host instanceof StandardHost) {
debug = ((StandardHost) host).getDebug();
}
// Make sure that there is no such directory already existing
File appBase = new File(host.getAppBase());
if (!appBase.isAbsolute()) {
appBase = new File(System.getProperty(“catalina.base”),
host.getAppBase());
}
if (!appBase.exists() || !appBase.isDirectory()) {
throw new IOException
(sm.getString(“hostConfig.appBase”,
appBase.getAbsolutePath()));
}
File docBase = new File(appBase, pathname);
if (docBase.exists()) {
// War file is already installed
return (docBase.getAbsolutePath());
}
// Create the new document base directory
docBase.mkdir();
if (debug >= 2) {
logger.log(” Have created expansion directory “
docBase.getAbsolutePath());
}
// Expand the WAR into the new document base directory
JarURLConnection juc = (JarURLConnection) war.openConnection();
juc.setUseCaches(false);
JarFile jarFile = null;
InputStream input = null;
try {
jarFile = juc.getJarFile();
if (debug >= 2) {
logger.log(” Have opened JAR file successfully”);
}
Enumeration jarEntries = jarFile.entries();
if (debug >= 2) {
logger.log(” Have retrieved entries enumeration”);
}
while (jarEntries.hasMoreElements()) {
JarEntry jarEntry = (JarEntry) jarEntries.nextElement();
String name = jarEntry.getName();
if (debug >= 2) {
logger.log(” Am processing entry “ name);
}
int last = name.lastIndexOf(‘/‘);
if (last >= 0) {
File parent = new File(docBase,
name.substring(0, last));
if (debug >= 2) {
logger.log(” Creating parent directory “ parent);
}
parent.mkdirs();
}
if (name.endsWith(“/”)) {
continue;
}
if (debug >= 2) {
logger.log(” Creating expanded file “ name);
}
input = jarFile.getInputStream(jarEntry);
expand(input, docBase, name);
input.close();
input = null;
}
} catch (IOException e) {
// If something went wrong, delete expanded dir to keep things
// clean
deleteDir(docBase);
throw e;
} finally {
if (input != null) {
try {
input.close();
} catch (Throwable t) {
;
}
input = null;
}
if (jarFile != null) {
try {
jarFile.close();
} catch (Throwable t) {
;
}
jarFile = null;
}
}
// Return the absolute path to our new document base directory
return (docBase.getAbsolutePath());
}
/**
* Delete the specified directory, including all of its contents and
* subdirectories recursively.
*
* @param dir File object representing the directory to be deleted
*/
public static void deleteDir(File dir) {
String files[] = dir.list();
if (files == null) {
files = new String[0];
}
for (int i = 0; i < files.length; i ) {
File file = new File(dir, files[i]);
if (file.isDirectory()) {
deleteDir(file);
} else {
file.delete();
}
}
dir.delete();
}
/**
* Expand the specified input stream into the specified directory, creating
* a file named from the specified relative path.
*
* @param input InputStream to be copied
* @param docBase Document base directory into which we are expanding
* @param name Relative pathname of the file to be created
*
* @exception IOException if an input/output error occurs
*/
protected static void expand(InputStream input, File docBase, String name)
throws IOException {
File file = new File(docBase, name);
BufferedOutputStream output = null;
try {
output =
new BufferedOutputStream(new FileOutputStream(file));
byte buffer[] = new byte[2048];
while (true) {
[b]int n = input.read(buffer);[/b]
if (n <= 0)
break;
output.write(buffer, 0, n);
}
} finally {
if (output != null) {
try {
output.close();
} catch (IOException e) {
// Ignore
}
}
}
}
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