java资源加载方式比较
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String url = "xxx";
Map map = new HashMap();
URL u = ClassLoader.getSystemResource(url);
map.put("ClassLoader.getSystemResource",u);
u = WebUtil.class.getResource(url);
map.put("WebUtil.class.getResource",u);
u = WebUtil.class.getClassLoader().getResource(url);
map.put("WebUtil.class.getClassLoader().getResource",u);
u = Thread.currentThread().getContextClassLoader().getResource(url);
map.put("Thread.currentThread().getContextClassLoader().getResource",u);
推荐使用
Thread.currentThread().getContextClassLoader().getResource
url 不要 以 / 开头
使用 ContextClassLoader 都能加载到资源 (除了 /java/lang/String.class )
ContextClassLoader 上下文加载器 web应用等(自定义类加载器) 加载资源
ClassLoader.getSystemResource 加载不到 web应用加载器加载的资源
各种资源路径加载情况
log4j.properties
{
"WebUtil.class.getClassLoader().getResource": "file:/Users/dugang/fun/hellocode/project/benchmark/target/classes/log4j.properties",
"Thread.currentThread().getContextClassLoader().getResource": "file:/Users/dugang/fun/hellocode/project/benchmark/target/classes/log4j.properties"
}
/log4j.properties
{
"WebUtil.class.getClassLoader().getResource": "file:/Users/dugang/fun/hellocode/project/benchmark/target/classes/log4j.properties",
"WebUtil.class.getResource": "file:/Users/dugang/fun/hellocode/project/benchmark/target/classes/log4j.properties",
"Thread.currentThread().getContextClassLoader().getResource": "file:/Users/dugang/fun/hellocode/project/benchmark/target/classes/log4j.properties"
}
java/lang/String.class
{
"WebUtil.class.getClassLoader().getResource": "jar:file:/Library/Java/JavaVirtualMachines/jdk1.8.0_121.jdk/Contents/Home/jre/lib/rt.jar!/java/lang/String.class",
"Thread.currentThread().getContextClassLoader().getResource": "jar:file:/Library/Java/JavaVirtualMachines/jdk1.8.0_121.jdk/Contents/Home/jre/lib/rt.jar!/java/lang/String.class",
"ClassLoader.getSystemResource": "jar:file:/Library/Java/JavaVirtualMachines/jdk1.8.0_121.jdk/Contents/Home/jre/lib/rt.jar!/java/lang/String.class"
}
/java/lang/String.class
{
"WebUtil.class.getResource": "jar:file:/Library/Java/JavaVirtualMachines/jdk1.8.0_121.jdk/Contents/Home/jre/lib/rt.jar!/java/lang/String.class"
}
com/google/common/math/DoubleUtils.class
{
"WebUtil.class.getClassLoader().getResource": "jar:file:/Users/dugang/m2/com/google/guava/guava/16.0.1/guava-16.0.1.jar!/com/google/common/math/DoubleUtils.class",
"Thread.currentThread().getContextClassLoader().getResource": "jar:file:/Users/dugang/m2/com/google/guava/guava/16.0.1/guava-16.0.1.jar!/com/google/common/math/DoubleUtils.class"
}
/com/google/common/math/DoubleUtils.class
{
"WebUtil.class.getClassLoader().getResource": "jar:file:/Users/dugang/m2/com/google/guava/guava/16.0.1/guava-16.0.1.jar!/com/google/common/math/DoubleUtils.class",
"WebUtil.class.getResource": "jar:file:/Users/dugang/m2/com/google/guava/guava/16.0.1/guava-16.0.1.jar!/com/google/common/math/DoubleUtils.class",
"Thread.currentThread().getContextClassLoader().getResource": "jar:file:/Users/dugang/m2/com/google/guava/guava/16.0.1/guava-16.0.1.jar!/com/google/common/math/DoubleUtils.class"
}
dyyx/util/WebUtil.class
{
"WebUtil.class.getClassLoader().getResource": "file:/Users/dugang/fun/hellocode/project/benchmark/target/classes/dyyx/util/WebUtil.class",
"Thread.currentThread().getContextClassLoader().getResource": "file:/Users/dugang/fun/hellocode/project/benchmark/target/classes/dyyx/util/WebUtil.class"
}
/dyyx/util/WebUtil.class
"WebUtil.class.getClassLoader().getResource": "file:/Users/dugang/fun/hellocode/project/benchmark/target/classes/dyyx/util/WebUtil.class",
"WebUtil.class.getResource": "file:/Users/dugang/fun/hellocode/project/benchmark/target/classes/dyyx/util/WebUtil.class",
"Thread.currentThread().getContextClassLoader().getResource": "file:/Users/dugang/fun/hellocode/project/benchmark/target/classes/dyyx/util/WebUtil.class"
}
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