java - 获取证书对象时出错

Question

import java.security.cert.Certificate;
import java.security.cert.CertificateFactory;
import org.junit.Test;

public class TrustManagerTest {
    @Test
    public void testTrust() throws Exception
    {
        System.out.println("done 0");
        Certificate cert = CertificateFactory.getInstance("X509").generateCertificate(getClass().getResourceAsStream("Resources/certificate.cer"));
        System.out.println("done 1");
    }
}

我已检查了certificate.cer 文件的内容，它确实包含证书。我在创建证书对象时遇到以下异常。知道我哪里出错了吗？

java.security.cert.CertificateException: Missing input stream
    at sun.security.provider.X509Factory.engineGenerateCertificate(Unknown Source)
    at java.security.cert.CertificateFactory.generateCertificate(Unknown Source)
    at com.manh.msf.rest.auth.TrustManagerTest.testTrust(TrustManagerTest.java:13)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
    at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:73)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:46)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:180)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:41)
    at org.junit.runners.ParentRunner$1.evaluate(ParentRunner.java:173)
    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
    at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:220)

Answer 1

是的。

getResourceAsStream("Resources/certificate.cer")

如果/Resources的父目录不在您的CLASSPATH中，则getResourceAsStream将返回null。

这对我来说效果很好:

public class ClassLoaderDemo {
    public static void main(String[] args) {
        try {
            ClassLoader classLoader = ClassLoaderDemo.class.getClassLoader();
            if (classLoader != null) {
                InputStream is = classLoader.getResourceAsStream("mesh.xml");
                BufferedReader br = new BufferedReader(new InputStreamReader(is));
                String s = "";
                while ((s = br.readLine()) != null)  {
                    System.out.println(s);
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

我的输入文件不在包中；我把它放在/resources 目录中，并将其添加到我的 CLASSPATH 中。