ajax跨域问题--使用代理模式

利用代理模式是解决ajax跨域问题的一种简单有效的途径，在这里，利用apache的组件HttpComponents（http://hc.apache.org/ ）,利用下面的方法，传参为第三方服务的url，则返回响应字符串

 

public static String getHttpString(String url) {
        HttpClient client = new DefaultHttpClient();
        try {
            HttpGet httpGet = new HttpGet(url);
            HttpResponse response = client.execute(httpGet);
            
            if(response.getStatusLine().getStatusCode() == 200) {
                InputStream is = response.getEntity().getContent();
                BufferedReader br = new BufferedReader(new InputStreamReader(is));
                StringBuffer sb = new StringBuffer();
                String str = null;
                while((str = br.readLine()) != null) {
                    sb.append(str);
                }
                br.close();
                return sb.toString();
            } else {
                System.out.println("错误代码：" + response.getStatusLine().getStatusCode());
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally{
            if(client != null) {
                client.getConnectionManager().shutdown();
            }
        }
        return null;
    }