Android WebView跨域

最新推荐文章于 2025-06-04 16:37:59 发布

原创最新推荐文章于 2025-06-04 16:37:59 发布 · 3.2k 阅读

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本文介绍了一种通过重写WebViewClient的shouldInterceptRequest方法来实现跨域请求的方案。通过在响应头中添加Access-Control-Allow-Origin等字段，使得WebView能够处理来自不同源的请求，解决了跨域问题。

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实现原理：重写WebViewClient中shouldInterceptRequest方法，在Response中添加header达到跨域的作用；

@Override
        public WebResourceResponse shouldInterceptRequest(WebView view, String urlstr) {
            try {
                // Our implementation just parses the response and visualizes it. It does not properly handle
                // redirects or HTTP errors at the moment. It only serves as a demo for intercepting POST requests
                // as a starting point for supporting multiple types of HTTP requests in a full fletched browser
                URL url = null;
                String fileExtens =null;
                if (isProxyUrl) {
                    fileExtens = MimeTypeMap.getFileExtensionFromUrl(urlstr);
                }else{
                    url=new URL(urlstr);
                }
                if (TextUtils.isEmpty(fileExtens)){
                    fileExtens="html";
                }
                String mimeType = FileStreamType.getStreamType(fileExtens);
                if (isProxyUrl) {
                    url = new URL(generateProxyUrl(urlstr,mimeType));
                }
                URLConnection rulConnection = url.openConnection();
                HttpURLConnection conn = (HttpURLConnection) rulConnection;
                conn.setRequestProperty("contentType", mimeType);
                conn.setRequestProperty("Accept", mimeType);
                conn.setRequestProperty("Accept-Charset", "utf-8");
                conn.setRequestMethod("GET");
                    String encodeing =conn.getContentEncoding();
                    if(TextUtils.isEmpty(encodeing)){
                        encodeing="utf-8";
                    }
                WebResourceResponse webResourceResponse= new WebResourceResponse(mimeType,encodeing, conn.getInputStream());
                Map<String,String> headers=new HashMap<>();
                // 解决webView跨域问题
                headers.put("Access-Control-Allow-Origin", ApiPath.getInstance().getHostName());
                headers.put("Access-Control-Allow-Headers","X-Requested-With");
                headers.put("Access-Control-Allow-Methods","POST, GET, OPTIONS, DELETE");
                headers.put("Access-Control-Allow-Credentials", "true");
                webResourceResponse.setResponseHeaders(headers);
                return webResourceResponse;
//                }
            } catch (Exception e) {
                e.printStackTrace();
            }
            return null;
        }
    }