如何在JAX-RS中注入ApplicationContext [英] How to inject ApplicationContext in JAX-RS

问题描述

我正在使用Spring和JAX-RS编写一个Web服务，我对以下内容感到困惑

这是我的服务例子

  @Path（/ users）
公共类UserService {
 
 @GET 
 @Path （{id}）
 @Produces（application / xml）
 public User getById（@PathParam（id）int id）{
 ApplicationContext context = new ClassPathXmlApplicationContext（ beans.xml文件）; 
 UserDAO userDAO =（UserDAO）context.getBean（userDao）; 
返回userDAO.getById（id）; 
} 
 
} 
  

这是我的beans.xml

 <？xml version =1.0encoding =UTF-8？> 
< beans xmlns：xsi =http://www.w3.org/2001/XMLSchema-instance
 xmlns =http://www.springframework.org/schema/beans
 xsi：schemaLocation =http://www.springframework.org/schema/beans 
 http://www.springframework.org/schema/beans/spring-beans-3.0.xsd\"> 
 
<！ - 数据源初始化 - > 
< bean id =dataSourceclass =org.springframework.jdbc.datasource.DriverManagerDataSource> 
< property name =driverClassNamevalue =com.mysql.jdbc.Driver/> 
< property name =urlvalue =jdbc：mysql：// localhost：3306 / hospital-system/> 
< property name =usernamevalue =root/> 
< property name =passwordvalue =root/> 
< / bean> 
 
< bean id =userDaoclass =dao.UserDAO> 
< property name =dataSourceref =dataSource/> 
< / bean> 
 
< / beans> 
  

我想知道这是否是每次调用资源时加载Application上下文的正确技术，如果不，我该怎么改呢？

解决方案

每次在对此方法进行Web服务调用时创建应用程序工厂实例肯定不是一个好方法

因为这个方法可能被称为100次，我们不希望创建这个上下文100次，因为没有任何改变。<你可以实现 ApplicationContextAware 界面

• 如何注入ApplicationContext本身

你可以做

ApplicationContext context = new ClassPathXmlApplicationContext（beans.xml ）;

在其他地方，也许当您的应用程序启动时。

<希望这有帮助！

祝你好运！

I am writing a web service using Spring and JAX-RS, and I'm kinda confused with the following

Here's my service exmaple

@Path("/users")
public class UserService {

    @GET
    @Path("{id}")
    @Produces("application/xml")
    public User getById(@PathParam("id") int id) {
        ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
        UserDAO userDAO = (UserDAO) context.getBean("userDao");
        return userDAO.getById(id);
    }

}

And here's my beans.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns="http://www.springframework.org/schema/beans"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">

    <!-- Initialization for data source -->
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://localhost:3306/hospital-system"/>
        <property name="username" value="root"/>
        <property name="password" value="root"/>
    </bean>

    <bean id="userDao" class="dao.UserDAO">
        <property name="dataSource" ref="dataSource"/>
    </bean>

</beans>

I wonder if this is the right technique to load Application context each time the resource get's called, and if no, how should I change it?

解决方案

Creating the application factory instance everytime when a web service call is made to this method is definitely, not a good approach ,

as this method might get called maybe say 100 times, we do not want to have a over head of creating this context 100 times as nothing is going to change in it.

you may implement the ApplicationContextAware interface

• How to inject ApplicationContext itself

and you can do

ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");

at some other place , maybe when your application starts up.

hope this helps!

Good luck!

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