英文:
Springboot : Dependency injection in the filter does not work
问题
以下是翻译好的内容：
我正在开发一个Spring Boot应用程序。其中包含多个过滤器。对于新增的一个过滤器，我想要注入一个Bean。然而，在尝试注入该Bean时，我遇到了以下错误：
方法引发了'java.lang.UnsupportedOperationException'异常。无法评估com.test.api.filter.RContext$$EnhancerBySpringCGLIB$$4bbc6342.toString()
过滤器：
@Component
public class ContextFilter implements Filter {
private final static Logger LOG = LoggerFactory.getLogger(ContextFilter.class);
@Autowired
RContext rContext;
@Override
public void init(FilterConfig filterConfig) throws ServletException {
LOG.info("正在处理上下文过滤器");
}
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain filterChain) throws IOException, ServletException {
HttpServletRequest req = (HttpServletRequest) request;
LOG.info("开始...",
rContext.setContextData("测试数据");
LOG.info("完成...", req.getRequestURI());
}
@Override
public void destroy() {
}
}
RContext类：
@Component
@Scope(value="request", proxyMode=ScopedProxyMode.TARGET_CLASS)
public class RContext {
String user;
String contextData;
String activeProfile;
public String getUser() {
return user;
}
public void setUser(String user) {
this.user = user;
}
public String getContextData() {
return contextData;
}
public void setContextData(String contextData) {
this.contextData = contextData;
}
public String getActiveProfile() {
return activeProfile;
}
public void setActiveProfile(String activeProfile) {
this.activeProfile = activeProfile;
}
}
英文:
I am working on a springboot application. This contains multiple filters. For one of the newly introduced filter, I want to inject a bean.However I am getting following error while trying to inject the bean:
Method threw 'java.lang.UnsupportedOperationException' exception. Cannot evaluate com.test.api.filter.RContext$$EnhancerBySpringCGLIB$$4bbc6342.toString()
Filter:
@Component
public class ContextFilter implements Filter {
private final static Logger LOG = LoggerFactory.getLogger(ContextFilter.class);
@Autowired
RContext rContext;
@Override
public void init(FilterConfig filterConfig) throws ServletException {
LOG.info("Processing context filter");
}
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain filterChain) throws IOException, ServletException {
HttpServletRequest req = (HttpServletRequest) request;
LOG.info("Start..",
rContext.setContextData("Test data");
LOG.info("Done..", req.getRequestURI());
}
@Override
public void destroy() {
}
}
RContext class:
@Scope(value="request", proxyMode= ScopedProxyMode.TARGET_CLASS)
public class RContext {
String user;
String contextData;
String activeProfile;
public String getUser() {
return user;
}
public void setUser(String user) {
this.user = user;
}
public String getContextData() {
return contextData;
}
public void setContextData(String contextData) {
this.contextData = contextData;
}
public String getActiveProfile() {
return activeProfile;
}
public void setActiveProfile(String activeProfile) {
this.activeProfile = activeProfile;
}
}
</details>
# 答案1
**得分**: 0
如果您可以使用@Service对RContext类进行注解，那么在doFilter方法中可能可以使用以下解决方案：
```java
RContext rContext;
ServletContext servletContext = request.getServletContext();
WebApplicationContext wac = WebApplicationContextUtils.getWebApplicationContext(servletContext);
rContext = wac.getBean(RContext.class);
英文:
If you could annotate the RContext class with @Service, then the following solution might work in the doFilter method:
RContext rContext;
ServletContext servletContext = request.getServletContext();
WebApplicationContext wac = WebApplicationContextUtils.getWebApplicationContext(servletContext);
rContext = wac.getBean(RContext.class);
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