java判断远程资源地址链接是否有效，比如图片url等

╰+攻爆jí腚メ 2022-02-02 00:13 431阅读 0赞

在工作中，前端需要后端传送的图片等url，而不知道这些传上去的是否有效，这个小工具就是验证链接是否有效

1、在外网环境，无需配置代理

import java.net.HttpURLConnection;
    import java.net.URL;
    
    public class Test {
    
        public static void main(String[] args) {
    
            String url1 = "https://gss0.bdstatic.com/70cFsjip0QIZ8tyhnq/img/logo-zhidao.gif";
            String url2 = "http://www.baidu.com";
    
            System.out.println(isImagesTrue(url1));
            System.out.println(isImagesTrue(url2));
        }
    
        /**
         * 判断网络图片是否存在
         * imgUrl 图片地址链接
         */
        public static Boolean isImagesTrue(String imgUrl) {
    
            Integer RESPONSE_CODE = 0;
            try {
                URL url = new URL(imgUrl);
                HttpURLConnection urlcon = (HttpURLConnection) url.openConnection();
                RESPONSE_CODE = urlcon.getResponseCode();
            } catch (Exception e) {
                e.printStackTrace();
            }
    
            if (RESPONSE_CODE == HttpURLConnection.HTTP_OK) {
                System.out.println("posted ok!");
                return true;
            } else {
                System.out.println("Bad post...");
                return false;
            }
        }
    }

posted ok!
    true
    posted ok!
    true

2、在内网访问要设置自己公司的代理，否则连接失败

import java.net.HttpURLConnection;
    import java.net.InetSocketAddress;
    import java.net.Proxy;
    import java.net.URL;
    
    public class Test {
    
        public static void main(String[] args) {
    
            String url = "http://www.baidu.com";
            String url2 = "http://www.baidu.com";
            
            System.out.println(isImagesTrue(url));
            System.out.println(isImagesTrue(url2));
        }
    
        /**
         * 判断网络图片是否存在
         * url 图片地址链接
         */
        public static Boolean isImagesTrue(String imgUrl) {
    
            Integer RESPONSE_CODE = 0;
            try {
                URL url = new URL(imgUrl);
                Proxy proxy = new Proxy(Proxy.Type.HTTP,new InetSocketAddress("xxx.xxx.xxx.xx",8080));
                HttpURLConnection urlcon = (HttpURLConnection) url.openConnection(proxy);
                RESPONSE_CODE = urlcon.getResponseCode();
            } catch (Exception e) {
                e.printStackTrace();
            }
    
            if (RESPONSE_CODE == HttpURLConnection.HTTP_OK) {
                System.out.println("posted ok!");
                return true;
            } else {
                System.out.println("Bad post...");
                return false;
            }
        }
    }

posted ok!
    true
    posted ok!
    true