How to implement a code example of reading resource files under the class path in Java

This article mainly introduces the relevant information about Java's implementation code for reading resource files under the class path. Friends who need examples of the main implementation tool class code ResourceLoadUtil.java can refer to it

Java Read the resource file implementation code under the class path

1. Tool class code 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 { 
 
  /** 
   * @param args 
   */ 
  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")); 
 
  } 
 
  /** 
   * 根据Class加载资源文件 
   * 
   * @param clazz 
   * @param path 
   *      以&#39;/&#39;开头的路径: 使用绝对路径寻找文件(以ClassPath为根路径开始)<br> 
   *      否则: 使用相对路径寻找文件(相对于clazz位置路径开始) 
   * @return 
   */ 
  public static InputStream loadResourceByClazz(Class<?> clazz, String path) { 
    return clazz.getResourceAsStream(path); 
  } 
 
  /** 
   * 根据ClassLoader加载资源文件(单个), 使用默认的ClassLoader! 
   * 
   * @param path 
   *      不能以&#39;/&#39;开头的路径 
   * @return 
   */ 
  public static InputStream loadResourceByClassLoader(String path) { 
    return loadResourceByClassLoader(null, path); 
  } 
 
  /** 
   * 根据ClassLoader加载资源文件(单个), 使用默认的ClassLoader! 
   * 
   * @param path 
   *      不能以&#39;/&#39;开头的路径 
   * @return 
   */ 
  public static InputStream loadResourceByClassLoader(ClassLoader cl, String path) { 
    if (cl == null) { 
      cl = Thread.currentThread().getContextClassLoader(); 
    } 
    return cl.getResourceAsStream(path); 
  } 
 
  /** 
   * 根据ClassLoader加载资源文件(多个),使用默认的ClassLoader! 
   * 
   * @param path 
   *      不能以&#39;/&#39;开头的路径 
   * @return 
   */ 
  public static List<URL> loadResourcesByClassLoader(String path) { 
    return loadResourcesByClassLoader(null, path); 
  } 
 
  /** 
   * 根据ClassLoader加载资源文件(多个),使用指定的ClassLoader! 
   * 
   * @param path 
   *      不能以&#39;/&#39;开头的路径 
   * @return 
   */ 
  public static List<URL> loadResourcesByClassLoader(ClassLoader cl, String path) { 
    if (cl == null) { 
      cl = Thread.currentThread().getContextClassLoader(); 
    } 
    List<URL> urlLst = new ArrayList<URL>(); 
    try { 
      Enumeration<URL> urlsEnum = cl.getResources(path); 
      while (urlsEnum.hasMoreElements()) { 
        URL url = (URL) urlsEnum.nextElement(); 
        urlLst.add(url); 
      } 
    } catch (IOException e) { 
      e.printStackTrace(); 
    } 
    return urlLst; 
  } 
}

2. Execution results

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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