2.7.0版本getContextPath方法：
```
protected String getContextPath(URL url) {
        String contextPath = url.getPath();
        return contextPath.endsWith("/") ? contextPath.substring(0,contextPath.length()-1) : contextPath;
    }
```
无法将方法置入web容器中，退回2.6.5版本的方法：
```
protected String getContextPath(URL url) {
        int pos = url.getPath().lastIndexOf("/");
        return pos > 0 ? url.getPath().substring(0, pos) : "";
    }
```
使用正常，两个方法应该不等价的。
doExport();
        }
    }
    private boolean shouldExport() {
        Boolean shouldExport = getExport();
        if (shouldExport == null && provider != null) {
            shouldExport = provider.getExport();
        }
        // 
        if (shouldExport == null) {
            return true;
        }
        return shouldExport;
    }
    private boolean shouldDelay() {
        Integer delay = getDelay();
        if (delay == null && provider != null) {
            delay = provider.getDelay();
        }
        return delay != null && delay > 0;
    }
    protected synchronized void doExport() {
        if (unexported) {
            throw new IllegalStateException("The service " + interfaceClass.getName() + " has already unexported!");
        }
        if (exported) {
            return;
        }
        exported = true;
        if (StringUtils.isEmpty(path)) {