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2008年8月 (2)

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獲取WEB-INF/classes目錄下配置文件的Java類

通常情況下我們將配置文件放在WEB-INF/classes，如何獲取這個路徑有很多種途徑，下面這個類是我通常使用的類，基本上覆蓋了所有的文件讀取流。

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import java.io.*;
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import java.net.*;
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import java.util.*;
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/** A class to simplify access to resources through the classloader.
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* @author lavender
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*/
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public class Resources extends Object {
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/** Returns the URL of the resource on the classpath
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* @param resource The resource to find
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* @throws IOException If the resource cannot be found or read
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* @return The resource
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*/
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public static URL getResourceURL(String resource) throws IOException {
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URL url = null;
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ClassLoader loader = Resources.class.getClassLoader();
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if (loader != null) url = loader.getResource(resource);
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if (url == null) url = ClassLoader.getSystemResource(resource);
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if (url == null) throw new IOException("Could not find resource " + resource);
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return url;
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}
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/** Returns the URL of the resource on the classpath
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* @param loader The classloader used to load the resource
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* @param resource The resource to find
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* @throws IOException If the resource cannot be found or read
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* @return The resource
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*/
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public static URL getResourceURL(ClassLoader loader, String resource) throws IOException {
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URL url = null;
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if (loader != null) url = loader.getResource(resource);
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if (url == null) url = ClassLoader.getSystemResource(resource);
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if (url == null) throw new IOException("Could not find resource " + resource);
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return url;
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}
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/** Returns a resource on the classpath as a Stream object
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* @param resource The resource to find
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* @throws IOException If the resource cannot be found or read
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* @return The resource
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*/
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public static InputStream getResourceAsStream(String resource) throws IOException {
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InputStream in = null;
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ClassLoader loader = Resources.class.getClassLoader();
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if (loader != null) in = loader.getResourceAsStream(resource);
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if (in == null) in = ClassLoader.getSystemResourceAsStream(resource);
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if (in == null) throw new IOException("Could not find resource " + resource);
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return in;
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}
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/** Returns a resource on the classpath as a Stream object
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* @param loader The classloader used to load the resource
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* @param resource The resource to find
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* @throws IOException If the resource cannot be found or read
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* @return The resource
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*/
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public static InputStream getResourceAsStream(ClassLoader loader, String resource) throws IOException {
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InputStream in = null;
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if (loader != null) in = loader.getResourceAsStream(resource);
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if (in == null) in = ClassLoader.getSystemResourceAsStream(resource);
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if (in == null) throw new IOException("Could not find resource " + resource);
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return in;
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}
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/** Returns a resource on the classpath as a Properties object
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* @param resource The resource to find
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* @throws IOException If the resource cannot be found or read
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* @return The resource
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*/
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public static Properties getResourceAsProperties(String resource)
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throws IOException {
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Properties props = new Properties();
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InputStream in = null;
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String propfile = resource;
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in = getResourceAsStream(propfile);
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props.load(in);
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in.close();
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return props;
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}
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/** Returns a resource on the classpath as a Properties object
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* @param loader The classloader used to load the resource
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* @param resource The resource to find
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* @throws IOException If the resource cannot be found or read
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* @return The resource
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*/
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public static Properties getResourceAsProperties(ClassLoader loader, String resource)
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throws IOException {
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Properties props = new Properties();
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InputStream in = null;
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String propfile = resource;
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in = getResourceAsStream(loader, propfile);
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props.load(in);
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in.close();
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return props;
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}
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/** Returns a resource on the classpath as a Reader object
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* @param resource The resource to find
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* @throws IOException If the resource cannot be found or read
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* @return The resource
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*/
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public static InputStreamReader getResourceAsReader(String resource) throws IOException {
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return new InputStreamReader(getResourceAsStream(resource));
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}
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/** Returns a resource on the classpath as a Reader object
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* @param loader The classloader used to load the resource
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* @param resource The resource to find
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* @throws IOException If the resource cannot be found or read
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* @return The resource
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*/
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public static Reader getResourceAsReader(ClassLoader loader, String resource) throws IOException {
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return new InputStreamReader(getResourceAsStream(loader, resource));
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}
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/** Returns a resource on the classpath as a File object
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* @param resource The resource to find
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* @throws IOException If the resource cannot be found or read
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* @return The resource
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*/
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public static File getResourceAsFile(String resource) throws IOException {
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return new File(getResourceURL(resource).getFile());
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}
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/** Returns a resource on the classpath as a File object
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* @param loader The classloader used to load the resource
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* @param resource The resource to find
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* @throws IOException If the resource cannot be found or read
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* @return The resource
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*/
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public static File getResourceAsFile(ClassLoader loader, String resource) throws IOException {
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return new File(getResourceURL(loader, resource).getFile());
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}
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}

posted on 2008-08-19 10:10 iamlavender 閱讀(2602) 評論(0) 編輯收藏

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獲取WEB-INF/classes目錄下配置文件的Java類