我开发了一个Asymmetric-Crypto应用程序，使用公共私钥来加密java中的文件并且运行良好但是当我在Spring启动时尝试它时，我得到了java.lang.NullPointerException：null异常。以下是我的代码示例
@Component
public class Loader {
private Cipher cipher;
PrivateKey privateKey;
public String enText;
@Autowired
private ResourceLoader resourceLoader;
@Value("${classpath:asymetric.private.key-store}")
private String file;
public Loader() throws NoSuchAlgorithmException, NoSuchPaddingException {
this.cipher = Cipher.getInstance("RSA");
}
public String encryptText(String msg, PrivateKey key) throws NoSuchAlgorithmException, NoSuchPaddingException,
UnsupportedEncodingException, IllegalBlockSizeException, BadPaddingException, InvalidKeyException {
this.cipher.init(Cipher.ENCRYPT_MODE, key);
return Base64.encodeBase64String(cipher.doFinal(msg.getBytes("UTF-8")));
}
public PrivateKey getPrivate(String filename) throws Exception {
byte[] keyBytes = Files.readAllBytes(new File(filename).toPath());// the error is from here
PKCS8EncodedKeySpec spec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory kf = KeyFactory.getInstance("RSA");
return kf.generatePrivate(spec);
}
public String encryptWithKey(String msg) throws Exception {
Loader loader = new Loader();
Resource res = resourceLoader.getResource("classpath:KeyPair/privateKey");
//privateKey = loader.getPrivate("KeyPair/privateKey");
privateKey = loader.getPrivate(res.getFilename());
return loader.encryptText(msg, privateKey);
}
@PostConstruct
public void load() throws Exception {
Loader loader = new Loader();
String msg = "Hello , I am here";
loader.encryptWithKey(msg);
}
}
在普通的java控制台环境中，我使用
`byte[] keyBytes = Files.readAllBytes(new File("KeyPair/privateKey").toPath());`
并且它工作但不是在春季启动环境中，我得到的是以下错误。
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2018-03-23 10:23:45.591 ERROR 3048 --- [ restartedMain] o.s.boot.SpringApplication : Application run failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'loader': Invocation of init method failed; nested exception is java.lang.NullPointerException
at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:138) ~[spring-beans-5.0.4.RELEASE.jar:5.0.4.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:423) ~[spring-beans-5.0.4.RELEASE.jar:5.0.4.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1702) ~[spring-beans-5.0.4.RELEASE.jar:5.0.4.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:583) ~[spring-beans-5.0.4.RELEASE.jar:5.0.4.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:502) ~[spring-beans-5.0.4.RELEASE.jar:5.0.4.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:312) ~[spring-beans-5.0.4.RELEASE.jar:5.0.4.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228) ~[spring-beans-5.0.4.RELEASE.jar:5.0.4.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:310) ~[spring-beans-5.0.4.RELEASE.jar:5.0.4.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:200) ~[spring-beans-5.0.4.RELEASE.jar:5.0.4.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:760) ~[spring-beans-5.0.4.RELEASE.jar:5.0.4.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:868) ~[spring-context-5.0.4.RELEASE.jar:5.0.4.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549) ~[spring-context-5.0.4.RELEASE.jar:5.0.4.RELEASE]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:140) ~[spring-boot-2.0.0.RELEASE.jar:2.0.0.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:752) [spring-boot-2.0.0.RELEASE.jar:2.0.0.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:388) [spring-boot-2.0.0.RELEASE.jar:2.0.0.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:327) [spring-boot-2.0.0.RELEASE.jar:2.0.0.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1246) [spring-boot-2.0.0.RELEASE.jar:2.0.0.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1234) [spring-boot-2.0.0.RELEASE.jar:2.0.0.RELEASE]
at com.polaris.RegistryServiceApplication.main(RegistryServiceApplication.java:17) [classes/:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_162]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_162]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_162]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_162]
at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) [spring-boot-devtools-2.0.0.RELEASE.jar:2.0.0.RELEASE]
Caused by: java.lang.NullPointerException: null
at com.polaris.loader.Loader.encryptWithKey(Loader.java:67) ~[classes/:na]
at com.polaris.loader.Loader.load(Loader.java:77) ~[classes/:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_162]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_162]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_162]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_162]
at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleElement.invoke(InitDestroyAnnotationBeanPostProcessor.java:369) ~[spring-beans-5.0.4.RELEASE.jar:5.0.4.RELEASE]
at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleMetadata.invokeInitMethods(InitDestroyAnnotationBeanPostProcessor.java:312) ~[spring-beans-5.0.4.RELEASE.jar:5.0.4.RELEASE]
at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:135) ~[spring-beans-5.0.4.RELEASE.jar:5.0.4.RELEASE]
... 23 common frames omitted
提前致谢..已经在这2天了......请...
答案 0 :(得分：0)
上述错误明确指出 -
在上面的代码中，你已经自动装配了ResourceLoader类，如果你想自动装配一个类的任何属性，那么它需要声明该类，即ResouceLoader是spring bean。
@Autowired private ResourceLoader resourceLoader;
因此，当您在ResourceLoader类上调用encryptWithKey时，您将获得NPE。
答案 1 :(得分：0)
尝试以这样的方式阅读文件：
Files.readAllLines(Paths.get(res.getURI()))