代理访问网页，拿到图片，文件最终指向地址 悟寰轩

网页中会用到很多相对路径 ../等

if (url.startsWith("../")) {
            String link = getRealLink(hostUrl.getPath());
            String[] str = hostUrl.getPath().split("/");
            int len = url.split("\\.\\./").length;
            String s = "";
            if (link.split("/").length != 3) {
                for (int i = 0; i < str.length - len; i++) {
                    s += str[i] + "/";
                }
                url = s + url.replaceAll("\\.\\./", "");
            } else {
                url = link + "/" + url.replaceAll("\\.\\./", "");
            }
        }

/**
     * 获得最终访问地址
     * 
     * @param link
     * @return
     * @throws ProtocolException
     */
    private String getRealLink(String link) {
        DefaultHttpClient httpClient = new DefaultHttpClient();
        HttpGet httpget = new HttpGet(link);
        HttpContext context = new BasicHttpContext();
        HttpResponse response = null;
        try {
            response = httpClient.execute(httpget, context);
        } catch (ClientProtocolException e1) {
        } catch (IOException e1) {
        }
        if (response.getStatusLine().getStatusCode() != HttpStatus.SC_OK)
            try {
                throw new IOException(response.getStatusLine().toString());
            } catch (IOException e) {
            }
        HttpUriRequest currentReq = (HttpUriRequest) context.getAttribute(ExecutionContext.HTTP_REQUEST);
        HttpHost currentHost = (HttpHost) context.getAttribute(ExecutionContext.HTTP_TARGET_HOST);
        link = (currentReq.getURI().isAbsolute()) ? currentReq.getURI().toString() : (currentHost.toURI() + currentReq
                .getURI());
        return link;
    }

简单记录下！

来自：http://stackoverflow.com/questions/1456987/httpclient-4-how-to-capture-last-redirect-url