Use the Javax Interceptor API framework to implement transaction management and security verification
Use the Javax Interceptor API framework to implement transaction management and security verification
introduce:
In Java applications, transaction management and security verification are very important functions.The Javax Interceptor API framework provides a simple and powerful way to manage transactions and perform security verification.This article will introduce how to use the Javax Interceptor API framework to implement these functions.
1. Affairs management:
Affairs management is a key mechanism to ensure the consistency and integrity of the database operation.By using the Javax Interceptor API framework, we can automatically open and submit transactions before and after the execution of the method.
First of all, we need to create a class to implement javax.interceptor.interceptor interface and use @InterCepptor annotation for annotation.In this category, we can define the interception method.
@Interceptor
public class TransactionInterceptor implements Serializable {
@Inject
private EntityManager entityManager;
@AroundInvoke
public Object manageTransaction(InvocationContext invocationContext) throws Exception {
EntityTransaction transaction = entityManager.getTransaction();
transaction.begin();
Object result = null;
try {
result = invocationContext.proceed();
transaction.commit();
} catch (Exception e) {
transaction.rollback();
throw e;
}
return result;
}
}
In the above code fragment, we used javax.persistence.entityManager to access the database.In the ManageTransAction method, we use @AaroundinVoke annotations to define the behavior of the interceptor.At the beginning of the method, we start a new transaction, and then call invocationContext.prceeed () method to execute the logic of the original method, and finally submit or roll back the transaction.
Next, we need to register the interceptor in the configuration file of the application.We can use the Persistence.xml file for configuration.
<persistence xmlns="http://java.sun.com/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"
version="2.0">
<persistence-unit name="YourPersistenceUnit">
<jta-data-source>yourDataSource</jta-data-source>
<class>yourEntityClass</class>
<properties>
<property name="javax.persistence.transactionType" value="JTA" />
<property name="javax.persistence.jtaDataSource" value="yourDataSource" />
</properties>
<jta-data-source>YourDataSource</jta-data-source>
</persistence-unit>
<interceptors>
<interceptor>
<class>yourTransactionInterceptorClass</class>
</interceptor>
</interceptors>
</persistence>
In the configuration file above, we define the data source (YourdataSource) and the YOURENTITITYCLASS.We then set the type of transaction to JTA and specify the data source.Finally, we register our transaction interceptor class in the Internet of the Internet.
2. Security verification:
Security verification is an important part of application protection.Using the Javax Interceptor API framework, we can provide security verification before the method execution to ensure that only authorized users can access the protected method.
To implement security verification, we need to create a class to implement javax.interceptor.interceptor interface, and use @Interceptor and @Priority annotations for annotations.
@Interceptor
@Priority(Interceptor.Priority.APPLICATION)
public class SecurityInterceptor implements Serializable {
@Inject
private UserSession userSession;
@AroundInvoke
public Object validateUserAccess(InvocationContext invocationContext) throws Exception {
if (!userSession.isAuthenticated()) {
throw new SecurityException("Access denied");
}
return invocationContext.proceed();
}
}
In the above code clips, we use the userSerssion object to obtain the status of the current user's identity.In the ValidateUserAccess method, we check whether the user has passed the authentication. If it is not authorized, the SecurityException is thrown out.If the verification is passed, the logic of the original method is called to call the invocationContext.prceed () method to execute the original method.
Next, we need to register the interceptor in the configuration file of the application.Similar to the above transaction management, we can configure it using the Persistence.xml file.
<persistence ...>
...
<interceptors>
<interceptor>
<class>yourSecurityInterceptorClass</class>
</interceptor>
</interceptors>
</persistence>
In the Interceptors tags in the above configuration file, we register our safety interceptor class.
Summarize:
This article introduces methods to implement transaction management and security verification using the Javax Interceptor API framework.By using this framework, we can simplify the code to improve the maintenance and security of the application.The example code in the configuration file also shows how to register the interceptor class.
