Java 如何从RestTemplate获取重定向url？

我想使用http GET调用RestTemplate并检索状态代码和重定向的url（如果有）

如何做到这一点

使用自定义的重定向策略创建Apache

HttpClient

，您可以在重定向发生时拦截中间响应

将默认请求工厂替换为

HttpComponentsClientHttpRequestFactory

和新的Apache

HttpClient

有关更多信息，请查看。或者重复使用

DefaultRedirectStrategy

，如下例所示：

CloseableHttpClient httpClient = HttpClientBuilder
        .create()
        .setRedirectStrategy( new DefaultRedirectStrategy() {

            @Override
            public boolean isRedirected(HttpRequest request, HttpResponse response,
                    HttpContext context) throws ProtocolException {

                System.out.println(response);

                // If redirect intercept intermediate response.
                if (super.isRedirected(request, response, context)){
                    int statusCode  = response.getStatusLine().getStatusCode();
                    String redirectURL = response.getFirstHeader("Location").getValue();
                    System.out.println("redirectURL: " + redirectURL);
                    return true;
                }
                return false;
            }
        })
        .build();
HttpComponentsClientHttpRequestFactory factory = new HttpComponentsClientHttpRequestFactory(httpClient);
RestTemplate restTemplate = new RestTemplate(factory);
.......

---

在SimpleClientHttpRequestFactory中使用Spring并重写prepareConnection（）

RestTemplate restTemplate = new RestTemplate( new SimpleClientHttpRequestFactory(){
    @Override
    protected void prepareConnection( HttpURLConnection connection, String httpMethod ) {
        connection.setInstanceFollowRedirects(false);
    }
} );

ResponseEntity<Object> response = restTemplate.exchange( "url", HttpMethod.GET, null, Object.class );
int statusCode = response.getStatusCodeValue();
String location = response.getHeaders().getLocation() == null ? "" : response.getHeaders().getLocation().toString();

RestTemplate RestTemplate=新的RestTemplate（新的SimpleClientHttpRequestFactory（））{
@凌驾
受保护的void prepareConnection（HttpURLConnection连接，字符串httpMethod）{
connection.setInstanceFollowDirections（false）；
}
} );
ResponseEntity response=restemplate.exchange（“url”，HttpMethod.GET，null，Object.class）；
int statusCode=response.getStatusCodeValue（）；
字符串位置=响应。getHeaders（）。getLocation（）==null？“”：response.getHeaders（）.getLocation（）.toString（）；

这不起作用。RestTemplate将遵循重定向。我认为，不是默认的httpclient。

RestTemplate restTemplate = new RestTemplate( new SimpleClientHttpRequestFactory(){
    @Override
    protected void prepareConnection( HttpURLConnection connection, String httpMethod ) {
        connection.setInstanceFollowRedirects(false);
    }
} );

ResponseEntity<Object> response = restTemplate.exchange( "url", HttpMethod.GET, null, Object.class );
int statusCode = response.getStatusCodeValue();
String location = response.getHeaders().getLocation() == null ? "" : response.getHeaders().getLocation().toString();