Question

我有一个spring singleton bean，我需要访问该bean中的请求对象。我尝试在单例bean中自动装配HttpServletRequest：

@Autowired
private HttpServletRequest request;

...

public void setRequest(HttpServletRequest request) {
  this.request = request;
}

public HttpServletRequest getRequest() {
  return request;
}

但是我意识到它不会工作，因为该类充当单例bean（每个bean容器将创建一次Object）

然后我搜索了替代方案，并找到了代码snipet

 ServletRequestAttributes requestAttributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
    HttpServletRequest request = requestAttributes.getRequest();

应该有效，但没有成功。

还有其他方法可以解决这个问题吗？

Answer 1

要访问HttpServeletRequest中的Singleton Bean对象：

首先编写一个如下所示的简单过滤器，然后在web.xml中进行配置您可以将您选择的截取网址配置为/ *，这将过滤为所有网址模式。

创建一个类Context

public class Context {  
  private static ThreadLocal<Context> instance = new ThreadLocal<Context>();  
  private HttpServletRequest request;  
  private Context(HttpServletRequest request) {  
       this.request = request;  
  }  
  public static Context getCurrentInstance() {  
       return instance.get();  
  }  
  public static Context newInstance(HttpServletRequest request) {  
       Context context = new Context(request);  
       instance.set(context);  
       return context;  
  }  
  public void release() {  
       instance.remove();  
  }  
  public HttpServletRequest getRequest() {  
       return request;  
  }  
 }

创建过滤器“RequestAccessFilter.java”

public class RequestAccessFilter implements Filter {  
  @Override  
  public void destroy() {  
       // Nothing Needed            
  }  
  @Override  
  public void doFilter(ServletRequest request, ServletResponse response,  
            FilterChain chain) throws IOException, ServletException {  
       Context context = Context.newInstance((HttpServletRequest) request);  
       try {  
         chain.doFilter(request, response);  
       } finally {  
         context.release();  
       }  
  }  
  @Override  
  public void init(FilterConfig arg0) throws ServletException {  
       // Nothing Needed  
  }  
 }

在“web.xml”中配置过滤器

 <filter>  
    <filter-name>requestAccessFilter</filter-name>  
    <filter-class>com.myapp.web.filter.RequestAccessFilter</filter-class>  
 </filter>  
 <filter-mapping>  
    <filter-name>requestAccessFilter</filter-name>  
    <url-pattern>/*</url-pattern>  
 </filter-mapping>

在您的Bean类中，您可以访问

HttpServletRequest request = Context.getCurrentInstance().getRequest();

在spring singleton bean中获取请求对象

1 个答案: