Struts 2.3：運行時添加攔截器

Question

我有一個添加/更改攔截器運行時的任務（使用插件，無權訪問父配置）。

在Struts的早期版本（2.0）中，該操作非常簡單： InterceptorStackConfig和ActionConfig類具有方法addInterceptor和addInterceptors 。

在較新的版本（2.3）中，該方法移入了Builder靜態子類，而我不能像以前那樣使用它們。

因此，這是一個問題。 已經花了幾天時間試圖避免它。 有人可以幫忙嗎？

我之前的代碼示例：

public class IpLoggingInterceptorConfiguration implements ConfigurationProvider {

private Interceptor interceptor;
private Configuration configuration;

@Override
public void init(Configuration configuration) throws ConfigurationException {
    this.configuration = configuration;
}

@Override
public void loadPackages() throws ConfigurationException {

    for (Object packageConfigName : configuration.getPackageConfigNames()) {
        try {
            String name = (String) packageConfigName;
            PackageConfig packageConfig = configuration.getPackageConfig(name);
            updatePackage(packageConfig);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}

public void updatePackage(PackageConfig packageConfig) {
    Map interceptorConfigs = packageConfig.getInterceptorConfigs();

    for (Object stack : interceptorConfigs.keySet()) {

        if (!(interceptorConfigs.get(stack) instanceof InterceptorStackConfig)) continue;

        InterceptorStackConfig interceptorStackConfig = (InterceptorStackConfig) interceptorConfigs.get(stack);

        InterceptorMapping interceptorMapping = new InterceptorMapping("iplogging", getInterceptor());

        List<InterceptorMapping> list = new ArrayList<InterceptorMapping>();
        list.addAll(interceptorStackConfig.getInterceptors());
        interceptorStackConfig.getInterceptors().clear();
        interceptorStackConfig.addInterceptor(interceptorMapping);
        interceptorStackConfig.addInterceptors(list);
    }

    for (String key : packageConfig.getActionConfigs().keySet()) {
        ActionConfig actionConfig = packageConfig.getActionConfigs().get(key);

        InterceptorMapping interceptorMapping = new InterceptorMapping("iplogging", getInterceptor());

        List<InterceptorMapping> list = new ArrayList<InterceptorMapping>();
        list.addAll(actionConfig.getInterceptors());
        actionConfig.getInterceptors().clear();
        actionConfig.addInterceptor(interceptorMapping);
        actionConfig.addInterceptors(list);
    }
}


@Override
public void destroy() {
}

@Override
public boolean needsReload() {
    return false;
}

@Override
public void register(ContainerBuilder arg0, LocatableProperties arg1)
        throws ConfigurationException {
}

public Interceptor getInterceptor() {
    return interceptor;
}

public void setInterceptor(Interceptor interceptor) {
    this.interceptor = interceptor;
}
}

Answer 1

我發現並知道，這種解決方案很丑陋，但簡單又有效……也許有人會更好。

try {
            Field interceptorsListField=InterceptorStackConfig.class.getDeclaredField("interceptors");
            interceptorsListField.setAccessible(true);
            List<InterceptorMapping> interceptorsList= (List<InterceptorMapping>) interceptorsListField.get(interceptorStackConfig);

            List<InterceptorMapping> list = new ArrayList<>();
            list.add(interceptorMapping);
            list.addAll(interceptorStackConfig.getInterceptors());
            interceptorsListField.set(interceptorStackConfig,list);
        } catch (Exception e) {
            e.printStackTrace();
        }