如何在guice模块中注入servlet上下文？

编程问答 2022-06-12

问题描述

很抱歉输入错误的标题...
免责声明：在网络应用程序方面没有太多经验，主要是使用dropwizard。

所以我一直在尝试在Java Web应用程序中使用guice

我在servlet /资源文件中有servletContext，但是我需要在guice模块中注入，如何在guice模块中注入servlet上下文？

下面是参考代码，不胜感激！

CacheService 

public interface CacheService {
    public abstract String hello();
}

CacheServiceImpl 

public class CacheServiceImpl implements CacheService {
JedisPool jedisPool = null;

@Context
private ServletContext servletContext;

@Provides
public String hello() {
    log.info("CacheServiceImpl servletContext {}",servletContext); //  this is null
    return "hello world";
}


@Provides
public Jedis getJedisConnection() {
    HostAndPort redisServer = HostAndPortUtil.getRedisServers().get(0);
    if (jedisPool == null)
        jedisPool = new JedisPool(getJedisPoolConfig(),redisServer.getHost(),redisServer.getPort(),Protocol.DEFAULT_TIMEOUT,servletContext.getinitParameter("REdis_PSWD")); // sample example of servletContext requirement,there are other functions in this module which need context 
    return jedisPool.getResource();
}

}

CacheModule 

public class CacheModule implements Module{

    public void configure(final Binder binder) {
        binder.bind(ResourceServlet.class);
        binder.bind(CacheService.class).to(CacheServiceImpl.class);
    }
}

ResourceServlet 

@Slf4j
@Path("/")
@Singleton
public class ResourceServlet {

    @Context
    private ServletContext servletContext;

    @Inject
    public ResourceServlet(CacheService storageModule) throws JAXBException {
          log.info("base {}",storageModule.hello());
    }

    @GET
    @Path("/test")
    @Produces({MediaType.APPLICATION_JSON})
    public Product abc() {
        log.info("servletContext {}",servletContext); // this is not null but how do i pass it on to module?
        
    }
}

web.xml 

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee"
     xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
     id="WebApp_ID" version="3.1">
<welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
</welcome-file-list>

<context-param>
    <param-name>resteasy.guice.modules</param-name>
    <param-value>com.org.app.guice.CacheModule</param-value>
</context-param>

<listener>
    <listener-class>
        org.jboss.resteasy.plugins.guice.GuiceResteasyBootstrapservletcontextlistener
    </listener-class>
</listener>

<servlet>
    <servlet-name>Resteasy</servlet-name>
    <servlet-class>
        org.jboss.resteasy.plugins.server.servlet.HttpServletdispatcher
    </servlet-class>
</servlet>

<servlet-mapping>
    <servlet-name>Resteasy</servlet-name>
    <url-pattern>/*</url-pattern>
</servlet-mapping>
</web-app>

解决方法

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guicejavajavaresteasyservletcontextlistener