JAVA获取重定向地址URL的两种方法

1、使用HttpURLConnection

 HttpURLConnection conn = (HttpURLConnection) new URL("http://192.168.1.200/6178dc0f47ec4fb8b0f01d87e13ea92d")
                .openConnection();
 conn.setInstanceFollowRedirects(false);
 conn.setConnectTimeout(5000);        
 System.out.println(conn.getHeaderField("Location"));

2、使用RestTemplate

 RestTemplate restTemplate = new RestTemplateBuilder()
                .requestFactory(NoRedirectSimpleClientHttpRequestFactory.class)
                .setConnectTimeout(Duration.ofMillis(3000))
                .setReadTimeout(Duration.ofMillis(3000))
                .build();
        ResponseEntity<String> exchange = restTemplate.exchange(URI.create("http://192.168.1.200/6178dc0f47ec4fb8b0f01d87e13ea92d"),
                HttpMethod.GET, HttpEntity.EMPTY, String.class);
        System.out.println(exchange.getHeaders().getLocation().toString());

要禁止自动重定向写一个继承SimpleClientHttpRequestFactory的类，重写prepareConnection方法，把该属性设置为false；

public class NoRedirectSimpleClientHttpRequestFactory extends SimpleClientHttpRequestFactory {
   

    @Override
    protected void prepareConnection(HttpURLConnection connection, String httpMethod) throws IOException {
   
        super.prepareConnection(connection, httpMethod);
        connection.setInstanceFollowRedirects(false);
    }
}