我们的 Symfony 3.4 应用程序上有 memcache：
cache:
app: cache.adapter.memcached
default_memcached_provider: "%app.memcached.dsn%"
然而，我们被要求使用多个缓存服务器，因此仅传递一个 DSN 是不够的。
在这里（https://symfony.com/blog/new-in-symfony-3-3-memcached-cache-adapter），我看到你可以用这样的代码创建它：
$client = MemcachedAdapter::createConnection(array(
// format => memcached://[user:pass@][ip|host|socket[:port]][?weight=int]
// 'weight' ranges from 0 to 100 and it's used to prioritize servers
'memcached://my.server.com:11211'
'memcached://rmf:abcdef@localhost'
'memcached://127.0.0.1?weight=50'
'memcached://username:the-password@/var/run/memcached.sock'
'memcached:///var/run/memcached.sock?weight=20'
));
但是，这不是自动连接的。
我相信我们需要创建一个提供程序类，或者以某种方式让它addServer($dsn)在实例化后进行调用。我还在随机帖子中看到以下内容：
memcache:
class: Memcached
calls:
- [ addServer, [ %app.memcached.dsn.1% ]]
- [ addServer, [ %app.memcached.dsn.2% ]]
然而它并没有真正帮助或者我错过了一些东西。
有人可以帮忙吗？我如何创建这个提供者类？
我看到很多人@Autowired在构造函数中使用注释来注入依赖项，如下所示
@Service
public class Employee {
private EmployeeService employeeService;
@Autowired
public Employee(EmployeeService employeeService) {
this.employeeService = employeeService;
}
:
:
}
据我所知，现在 Spring 非常先进，Spring 构造函数/setter DI 即使没有@Autowired如下所示也能工作
@Service
public class Employee {
private EmployeeService employeeService;
public Employee(EmployeeService employeeService) {
this.employeeService = employeeService;
}
:
:
}
想知道人们是否有任何理由使用@Autowired注释来注释构造函数以注入依赖项。
有人可以帮我解决这个问题吗
在 Spring 中，有一种方法可以在构造函数调用之前将 application.properties 中定义的属性连接到用 @Value 注释的相应字段。
请参阅下面的代码中我的评论。我希望该字段prop1（及其值）可供 constructor . 是否可以。同样，我希望该字段prop1（及其值）可供该方法使用getInstanceProp()。是否可以？？
package com.demo;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
@Component
public class WirableComponent {
@Value("${prop1}")
String prop1;
String instanceProp = getInstanceProp(); //null - I want prop1 value to be injected before making this method call so i can use it in the method.
public WirableComponent() {
System.err.println("no-args WirableComponent Constructor invoked");
System.err.println("value prop1: " + prop1); //null - I want prop1 value to be injected before …我正在尝试为我的DAO类编写单元测试,但问题是我收到此错误:
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'com.yeah.server.dao.UserDAOTest': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.yeah.server.dao.UserDAO com.yeah.server.dao.UserDAOTest.userDAO; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No matching bean of type [com.yeah.server.dao.UserDAO] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
这是我的applicationContext文件
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-3.0.xsd">
<bean id="hibernateTemplate" class="org.springframework.orm.hibernate3.HibernateTemplate">
<property name="sessionFactory">
<ref local="sessionFactory" /> …我刚刚用Hibernate实现了Bean Validation.
如果我显式调用验证器它按预期工作,并且按预期注入连接到DB的@Autowired DAO bean.
我以前发现我需要在上面的内容之前添加以下语句.之前我已经广泛使用了@Autowired bean,但下面的语句对于由Spring管理验证器和注入ConstraintValidator的bean是必要的.
<bean id="validator"
class="org.springframework.validation.beanvalidation.LocalValidatorFactoryBean" />
但是,当在SessionFactory.getCurrentSession.merge期间自动调用验证器时,bean为null.
如果我通过调用javax.Validation.validate直接调用验证器,它的工作原理使我认为我已正确设置了Spring配置.
我已经读过人们无法获得DAO bean @Autowired的帖子的数字,但在我的情况下,除了在合并期间调用时.
下面的日志输出显示首先直接调用验证器,然后作为合并操作的结果调用.
07.12.2011 01:58:13 INFO [http-8080-1] (FileTypeAndClassValidator:isValid) - Validating ...
07.12.2011 01:58:13 INFO [http-8080-1] (ConstraintValidatorHelper:getPropertyValue) - propertyName=className, returnValue=com.twoh.dto.PurchaseOrder
07.12.2011 01:58:13 INFO [http-8080-1] (ConstraintValidatorHelper:getPropertyValue) - propertyName=fileTypeId, returnValue=4
07.12.2011 01:58:13 INFO [http-8080-1] (QueryUtil:createHQLQuery) - select ft.id from FileType ft where ft.id = :fileTypeId and ft.fileClassName = :fileClassName
07.12.2011 01:58:13 INFO [http-8080-1] (BaseDAO:merge) - Entity: com.twoh.dto.PurchaseOrder: 1036.
07.12.2011 01:58:13 INFO [http-8080-1] (FileTypeAndClassValidator:isValid) - Validating ...
07.12.2011 01:58:13 INFO …我的spring.xml如下
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:oxm="http://www.springframework.org/schema/oxm" xmlns:p="http://www.springframework.org/schema/p"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.2.xsd
">
<context:component-scan base-package="com.mkyong.service" />
<context:annotation-config />
</beans>
我有Test1类
package com.mkyong.service;
import org.springframework.stereotype.Component;
@Component("test1")
public class Test1 {
public int i=1;
}
我有一个App类
package com.mkyong.common;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.mkyong.service.Test1;
public class App
{
@Autowired
Test1 test1;
public static void main( String[] args )
{
ApplicationContext context = new ClassPathXmlApplicationContext(
"spring.xml");
App app=new App();
System.out.println(app.test1);
}
}
但我得到的输出为null.我无法正确地自动装配它.我做错了什么？
提出关于spring和tomcat的问题.我有以下代码
BookDAOImpl.java
@Repository
public class BookDAOImpl extends NamedParameterJdbcDaoSupport implements BookDAO {
private class BookMapper implements RowMapper<Book> {
@Override
public Book mapRow(ResultSet resultSet, int rowNum) throws SQLException {
Book book = new Book();
book.setId(resultSet.getInt("id"));
book.setTitle(resultSet.getString("title"));
book.setAuthor(resultSet.getString("author"));
book.setPublisher(resultSet.getString("publisher"));
book.setPublicationDate(resultSet.getDate("publication_date"));
book.setIsbn(resultSet.getString("isbn"));
book.setAvailable(resultSet.getBoolean("available"));
return book;
}
}
}
LibraryDataSource.java
@Component("dataSource")
public class LibraryDataSource extends DriverManagerDataSource {
@Autowired
public LibraryDataSource(@Value("${url}")String url, @Value("${user}")String username, @Value("${password}")String password) {
super(url, username, password);
}
}
应用程序的context.xml
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-4.0.xsd"
default-autowire="byName">
<context:annotation-config/> …我正在为一个类编写一系列测试用例,其中包括以下几种方法:
public ServiceResponse getListOfGroups() {
ServiceResponse serviceResponse = new ServiceResponse();
try{
Slf4JStopWatch sw = new Slf4JStopWatch("GetListOfGroups", log, DEBUG_LEVEL);
List<Group> Groups = Arrays.asList(restTemplate.getForObject(getGroupServiceURL(), Group[].class));
sw.stop();
serviceResponse.setData(Groups);
} catch(ServiceException ex) {
serviceResponse.setErrorObject(ex.getErrorObject());
}
return serviceResponse;
}
我遇到的问题是,restTemplate它@autowired来自类的实际实现(因此在单元测试透视图中调用时返回null).我将如何为这些方法编写适当的测试用例？
这是我到目前为止所尝试的:
@Test
public void testGetListOfGroups() {
//TODO
ServiceResponse resp = new ServiceResponse();
Mockito.when(uwsci.getListOfGroups()).thenReturn(resp); //uwsci is my mocked object
assertTrue(uwsci.getListOfGroups() == resp);
}
我觉得这会破坏单元测试的重点,因为它只是返回我告诉它的内容而不是真正做其他任何事情.
您好，我使用Spring Boot 1.3.2版本。我有一个自定义参数解析器，名称为ActiveCustomerArgumentResolver。一切都很好，resolveArgument方法工作正常，但是我无法初始化我的自定义arg的服务组件。解析器。生命周期流程有问题吗？这是我的代码：
import org.springframework.beans.factory.annotation.Autowired;
//other import statements
public class ActiveCustomerArgumentResolver implements HandlerMethodArgumentResolver {
@Autowired
private CustomerService customerService;
@Override
public boolean supportsParameter(MethodParameter parameter) {
if (parameter.hasParameterAnnotation(ActiveCustomer.class) && parameter.getParameterType().equals(Customer.class))
return true;
else
return false;
}
@Override
public Object resolveArgument(MethodParameter parameter, ModelAndViewContainer mavContainer, NativeWebRequest webRequest, WebDataBinderFactory binderFactory) throws Exception {
Principal userPrincipal = webRequest.getUserPrincipal();
if (userPrincipal != null) {
Long customerId = Long.parseLong(userPrincipal.getName());
return customerService.getCustomerById(customerId).orNull(); //customerService is still NULL here, it keeps me getting NullPointerEx.
} else { …我只是想知道是否还有其他方法可以自动装配请求范围的bean。所以现在我创建了一个beanin配置文件：
@Bean
@Scope(value=WebApplicationContext.SCOPE_REQUEST, proxyMode=ScopedProxyMode.DEFAULT)
public List<String> stringBean(){
return new ArrayList<String>();
}
所以通常我会自动连线applicationContext以使用bean：
@Autowired
private ApplicationContext context;
@Override
public void anyName() {
List<String> list = (List<String>) getContext().getBean("stringBean");
}
这完全正常。但是我不喜欢自动关联上下文和演员的需要。所以我尝试直接自动接线bean：
@Autowired
private List<String> stringBean;
我在启动应用程序时遇到了一个异常，这也很清楚，因为未在请求启动之前创建Bean。
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'stringBean': Scope 'request' is not active for the current thread; consider defining a scoped proxy for this bean if you intend to refer to it from a singleton; nested exception is java.lang.IllegalStateException: No thread-bound request …