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tomcat解压war包的1点例外

发布时间： 2013-10-30 12:56:22 作者： rapoo

tomcat解压war包的一点例外
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


  1. protected void deployWARs(File appBase, String[] files) {
  3. for (int i = 0; i < files.length; i++) {
  5. if (files[i].equalsIgnoreCase("META-INF"))
  6. continue;
  7. if (files[i].equalsIgnoreCase("WEB-INF"))
  8. continue;
  9. if (deployed.contains(files[i]))
  10. continue;
  11. File dir = new File(appBase, files[i]);
  12. if (files[i].toLowerCase().endsWith(".war")) {
  14. deployed.add(files[i]);
  16. // Calculate the context path and make sure it is unique
  17. String contextPath = "/" + files[i];
  18. int period = contextPath.lastIndexOf(".");
  19. if (period >= 0)
  20. contextPath = contextPath.substring(0, period);
  21. if (contextPath.equals("/ROOT"))
  22. contextPath = "";
  23. if (host.findChild(contextPath) != null)
  24. continue;
  26. // Checking for a nested /META-INF/context.xml
  27. JarFile jar = null;
  28. JarEntry entry = null;
  29. InputStream istream = null;
  30. BufferedOutputStream ostream = null;
  31. File xml = new File
  32. (configBase, files[i].substring
  33. (0, files[i].lastIndexOf(".")) + ".xml");
  34. if (!xml.exists()) {
  35. try {
  36. jar = new JarFile(dir);
  37. entry = jar.getJarEntry("META-INF/context.xml");
  38. if (entry != null) {
  39. istream = jar.getInputStream(entry);
  40. ostream =
  41. new BufferedOutputStream
  42. (new FileOutputStream(xml), 1024);
  43. byte buffer[] = new byte[1024];
  44. while (true) {
  45. int n = istream.read(buffer);
  46. if (n < 0) {
  47. break;
  48. }
  49. ostream.write(buffer, 0, n);
  50. }
  51. ostream.flush();
  52. ostream.close();
  53. ostream = null;
  54. istream.close();
  55. istream = null;
  56. entry = null;
  57. jar.close();
  58. jar = null;
  59. deployDescriptors(configBase(), configBase.list());
  60. return;
  61. }
  62. } catch (Exception e) {
  63. // Ignore and continue
  64. if (ostream != null) {
  65. try {
  66. ostream.close();
  67. } catch (Throwable t) {
  68. ;
  69. }
  70. ostream = null;
  71. }
  72. if (istream != null) {
  73. try {
  74. istream.close();
  75. } catch (Throwable t) {
  76. ;
  77. }
  78. istream = null;
  79. }
  80. entry = null;
  81. if (jar != null) {
  82. try {
  83. jar.close();
  84. } catch (Throwable t) {
  85. ;
  86. }
  87. jar = null;
  88. }
  89. }
  90. }
  92. if (isUnpackWARs()) {
  94. // Expand and deploy this application as a directory
  95. log.debug(sm.getString("hostConfig.expand", files[i]));
  96. URL url = null;
  97. String path = null;
  98. try {
  99. url = new URL("jar:file:" +
  100. dir.getCanonicalPath() + "!/");
  101. path = ExpandWar.expand(host, url);
  102. } catch (IOException e) {
  103. // JAR decompression failure
  104. log.warn(sm.getString
  105. ("hostConfig.expand.error", files[i]));
  106. continue;
  107. } catch (Throwable t) {
  108. log.error(sm.getString
  109. ("hostConfig.expand.error", files[i]), t);
  110. continue;
  111. }
  112. try {
  113. if (path != null) {
  114. url = new URL("file:" + path);
  115. ((Deployer) host).install(contextPath, url);
  116. }
  117. } catch (Throwable t) {
  118. log.error(sm.getString
  119. ("hostConfig.expand.error", files[i]), t);
  120. }
  122. } else {
  124. // Deploy the application in this WAR file
  125. log.info(sm.getString("hostConfig.deployJar", files[i]));
  126. try {
  127. URL url = new URL("file", null,
  128. dir.getCanonicalPath());
  129. url = new URL("jar:" + url.toString() + "!/");
  130. ((Deployer) host).install(contextPath, url);
  131. } catch (Throwable t) {
  132. log.error(sm.getString("hostConfig.deployJar.error",
  133. files[i]), t);
  134. }
  136. }
  138. }
  140. }
  142. }

类 ExpandWar.java
jakarta-tomcat-catalina/catalina/src/share/org/apache/catalina/startup/ExpandWar.java

  1. package org.apache.catalina.startup;
  3. import java.io.BufferedOutputStream;
  4. import java.io.File;
  5. import java.io.FileOutputStream;
  6. import java.io.InputStream;
  7. import java.io.IOException;
  8. import java.net.JarURLConnection;
  9. import java.net.URL;
  10. import java.util.Enumeration;
  11. import java.util.jar.JarEntry;
  12. import java.util.jar.JarFile;
  14. import org.apache.catalina.Host;
  15. import org.apache.catalina.Logger;
  16. import org.apache.catalina.core.StandardHost;
  17. import org.apache.catalina.util.StringManager;
  19. /**
  20. * Expand out a WAR in a Host‘s appBase.
  21. *
  22. * @author Craig R. McClanahan
  23. * @author Remy Maucherat
  24. * @author Glenn L. Nielsen
  25. * @version $Revision: 1.4 $
  26. */
  28. public class ExpandWar {
  31. /**
  32. * The string resources for this package.
  33. */
  34. protected static final StringManager sm =
  35. StringManager.getManager(Constants.Package);
  38. /**
  39. * Expand the WAR file found at the specified URL into an unpacked
  40. * directory structure, and return the absolute pathname to the expanded
  41. * directory.
  42. *
  43. * @param host Host war is being installed for
  44. * @param war URL of the web application archive to be expanded
  45. * (must start with "jar:")
  46. *
  47. * @exception IllegalArgumentException if this is not a "jar:" URL
  48. * @exception IOException if an input/output error was encountered
  49. * during expansion
  50. */
  51. public static String expand(Host host, URL war)
  52. throws IOException {
  54. int debug = 0;
  55. Logger logger = host.getLogger();
  57. if (host instanceof StandardHost) {
  58. debug = ((StandardHost) host).getDebug();
  59. }
  61. // Calculate the directory name of the expanded directory
  62. if (debug >= 1) {
  63. logger.log("expand(" + war.toString() + ")");
  64. }
  65. String pathname = war.toString().replace(‘\\‘, ‘/‘);
  66. if (pathname.endsWith("!/")) {
  67. pathname = pathname.substring(0, pathname.length() - 2);
  68. }
  69. int period = pathname.lastIndexOf(‘.‘);
  70. if (period >= pathname.length() - 4)
  71. pathname = pathname.substring(0, period);
  72. int slash = pathname.lastIndexOf(‘/‘);
  73. if (slash >= 0) {
  74. pathname = pathname.substring(slash + 1);
  75. }
  76. if (debug >= 1) {
  77. logger.log(" Proposed directory name: " + pathname);
  78. }
  79. return expand(host, war, pathname);
  81. }
  84. /**
  85. * Expand the WAR file found at the specified URL into an unpacked
  86. * directory structure, and return the absolute pathname to the expanded
  87. * directory.
  88. *
  89. * @param host Host war is being installed for
  90. * @param war URL of the web application archive to be expanded
  91. * (must start with "jar:")
  92. * @param pathname Context path name for web application
  93. *
  94. * @exception IllegalArgumentException if this is not a "jar:" URL
  95. * @exception IOException if an input/output error was encountered
  96. * during expansion
  97. */
  98. public static String expand(Host host, URL war, String pathname)
  99. throws IOException {
  101. int debug = 0;
  102. Logger logger = host.getLogger();
  104. if (host instanceof StandardHost) {
  105. debug = ((StandardHost) host).getDebug();
  106. }
  108. // Make sure that there is no such directory already existing
  109. File appBase = new File(host.getAppBase());
  110. if (!appBase.isAbsolute()) {
  111. appBase = new File(System.getProperty("catalina.base"),
  112. host.getAppBase());
  113. }
  114. if (!appBase.exists() || !appBase.isDirectory()) {
  115. throw new IOException
  116. (sm.getString("hostConfig.appBase",
  117. appBase.getAbsolutePath()));
  118. }
  119. File docBase = new File(appBase, pathname);
  120. if (docBase.exists()) {
  121. // War file is already installed
  122. return (docBase.getAbsolutePath());
  123. }
  125. // Create the new document base directory
  126. docBase.mkdir();
  127. if (debug >= 2) {
  128. logger.log(" Have created expansion directory " +
  129. docBase.getAbsolutePath());
  130. }
  132. // Expand the WAR into the new document base directory
  133. JarURLConnection juc = (JarURLConnection) war.openConnection();
  134. juc.setUseCaches(false);
  135. JarFile jarFile = null;
  136. InputStream input = null;
  137. try {
  138. jarFile = juc.getJarFile();
  139. if (debug >= 2) {
  140. logger.log(" Have opened JAR file successfully");
  141. }
  142. Enumeration jarEntries = jarFile.entries();
  143. if (debug >= 2) {
  144. logger.log(" Have retrieved entries enumeration");
  145. }
  146. while (jarEntries.hasMoreElements()) {
  147. JarEntry jarEntry = (JarEntry) jarEntries.nextElement();
  148. String name = jarEntry.getName();
  149. if (debug >= 2) {
  150. logger.log(" Am processing entry " + name);
  151. }
  152. int last = name.lastIndexOf(‘/‘);
  153. if (last >= 0) {
  154. File parent = new File(docBase,
  155. name.substring(0, last));
  156. if (debug >= 2) {
  157. logger.log(" Creating parent directory " + parent);
  158. }
  159. parent.mkdirs();
  160. }
  161. if (name.endsWith("/")) {
  162. continue;
  163. }
  164. if (debug >= 2) {
  165. logger.log(" Creating expanded file " + name);
  166. }
  167. input = jarFile.getInputStream(jarEntry);
  168. expand(input, docBase, name);
  169. input.close();
  170. input = null;
  171. }
  172. } catch (IOException e) {
  173. // If something went wrong, delete expanded dir to keep things
  174. // clean
  175. deleteDir(docBase);
  176. throw e;
  177. } finally {
  178. if (input != null) {
  179. try {
  180. input.close();
  181. } catch (Throwable t) {
  182. ;
  183. }
  184. input = null;
  185. }
  186. if (jarFile != null) {
  187. try {
  188. jarFile.close();
  189. } catch (Throwable t) {
  190. ;
  191. }
  192. jarFile = null;
  193. }
  194. }
  196. // Return the absolute path to our new document base directory
  197. return (docBase.getAbsolutePath());
  199. }
  202. /**
  203. * Delete the specified directory, including all of its contents and
  204. * subdirectories recursively.
  205. *
  206. * @param dir File object representing the directory to be deleted
  207. */
  208. public static void deleteDir(File dir) {
  210. String files[] = dir.list();
  211. if (files == null) {
  212. files = new String[0];
  213. }
  214. for (int i = 0; i < files.length; i++) {
  215. File file = new File(dir, files[i]);
  216. if (file.isDirectory()) {
  217. deleteDir(file);
  218. } else {
  219. file.delete();
  220. }
  221. }
  222. dir.delete();
  224. }
  227. /**
  228. * Expand the specified input stream into the specified directory, creating
  229. * a file named from the specified relative path.
  230. *
  231. * @param input InputStream to be copied
  232. * @param docBase Document base directory into which we are expanding
  233. * @param name Relative pathname of the file to be created
  234. *
  235. * @exception IOException if an input/output error occurs
  236. */
  237. protected static void expand(InputStream input, File docBase, String name)
  238. throws IOException {
  240. File file = new File(docBase, name);
  241. BufferedOutputStream output = null;
  242. try {
  243. output =
  244. new BufferedOutputStream(new FileOutputStream(file));
  245. byte buffer[] = new byte[2048];
  246. while (true) {
  247. [b]int n = input.read(buffer);[/b]
  248. if (n <= 0)
  249. break;
  250. output.write(buffer, 0, n);
  251. }
  252. } finally {
  253. if (output != null) {
  254. try {
  255. output.close();
  256. } catch (IOException e) {
  257. // Ignore
  258. }
  259. }
  260. }
  262. }
  265. }

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