Java 读取类路径下的资源文件实现代码

Java 读取类路径下的资源文件实现代码

一、工具类代码ResourceLoadUtil.java

import java.io.IOException; 
import java.io.InputStream; 
import java.net.URL; 
import java.util.ArrayList; 
import java.util.Enumeration; 
import java.util.List; 
 
public class ResourceLoadUtil { 
 
   
  public static void main(String[] args) { 
    System.out.println("ByClazz...n--------------------------"); 
    System.out.println(loadResourceByClazz(String.class, "/java/lang/String.class")); 
    System.out.println(loadResourceByClazz(String.class, "/ResourceLoadUtil.class")); 
    System.out.println(); 
 
    System.out.println("ByClasLoader...n--------------------------"); 
    System.out.println(loadResourceByClassLoader("java/lang/String.class")); 
    System.out.println(loadResourceByClassLoader("ResourceLoadUtil.class")); 
    System.out.println(); 
 
    System.out.println("sByClasLoader...n--------------------------"); 
    System.out.println(loadResourcesByClassLoader("java/lang/String.class")); 
    System.out.println(loadResourcesByClassLoader("ResourceLoadUtil.class")); 
    System.out.println(loadResourcesByClassLoader("struts-plugin.xml")); 
 
  } 
 
   
  public static InputStream loadResourceByClazz(Class clazz, String path) { 
    return clazz.getResourceAsStream(path); 
  } 
 
   
  public static InputStream loadResourceByClassLoader(String path) { 
    return loadResourceByClassLoader(null, path); 
  } 
 
   
  public static InputStream loadResourceByClassLoader(ClassLoader cl, String path) { 
    if (cl == null) { 
      cl = Thread.currentThread().getContextClassLoader(); 
    } 
    return cl.getResourceAsStream(path); 
  } 
 
   
  public static List loadResourcesByClassLoader(String path) { 
    return loadResourcesByClassLoader(null, path); 
  } 
 
   
  public static List loadResourcesByClassLoader(ClassLoader cl, String path) { 
    if (cl == null) { 
      cl = Thread.currentThread().getContextClassLoader(); 
    } 
    List urlLst = new ArrayList(); 
    try { 
      Enumeration urlsEnum = cl.getResources(path); 
      while (urlsEnum.hasMoreElements()) { 
 URL url = (URL) urlsEnum.nextElement(); 
 urlLst.add(url); 
      } 
    } catch (IOException e) { 
      e.printStackTrace(); 
    } 
    return urlLst; 
  } 
} 
 
 
 

二、执行结果

ByClazz... 
-------------------------- 
sun.net.www.protocol.jar.JarURLConnection$JarURLInputStream@11cfb549 
java.io.BufferedInputStream@a422ede 
 
ByClasLoader... 
-------------------------- 
sun.net.www.protocol.jar.JarURLConnection$JarURLInputStream@7f12f614 
java.io.BufferedInputStream@35d9dc39 
 
sByClasLoader... 
-------------------------- 
[jar:file:/D:/Java/jdk1.6.0_25/jre/lib/rt.jar!/java/lang/String.class] 
[file:/E:/workspace/JBDS/Spring+Struts2-Integration/target/classes/ResourceLoadUtil.class] 
[jar:file:/E:/360data/%e9%87%8d%e8%a6%81%e6%95%b0%e6%8d%ae/.m2/repository/org/apache/struts/struts2-spring-plugin/2.3.4.1/struts2-spring-plugin-2.3.4.1.jar!/struts-plugin.xml, jar:file:/E:/360data/%e9%87%8d%e8%a6%81%e6%95%b0%e6%8d%ae/.m2/repository/org/apache/struts/struts2-config-browser-plugin/2.3.4.1/struts2-config-browser-plugin-2.3.4.1.jar!/struts-plugin.xml] 

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