java - 使用 HttpClient 获取 URL 状态代码的最快方法是什么

Question

使用 HttpClient 获取 URL 状态的最快方法是什么？我不想下载页面/文件，我只想知道页面/文件是否存在？(如果是重定向我希望它跟随重定向)

Answer 1

下面是我非常喜欢的从HttpClient获取状态码的方法:

public boolean exists(){
    CloseableHttpResponse response = null;
    try {
        CloseableHttpClient client = HttpClients.createDefault();
        HttpHead headReq = new HttpHead(this.uri);                      
        response = client.execute(headReq);         
        StatusLine sl = response.getStatusLine();           
        switch (sl.getStatusCode()) {
            case 404:  return false;                     
            default: return true;                     
        }           

    } catch (Exception e) {
        log.error("Error in HttpGroovySourse : "+e.getMessage(), e );
    } finally {

        try {
            response.close();
        } catch (Exception e) {
            log.error("Error in HttpGroovySourse : "+e.getMessage(), e );
        }
    }       

    return false;
}