{"id":27841,"date":"2024-03-16T09:19:29","date_gmt":"2024-03-16T09:19:29","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-invoke-external-interfaces-in-java-backend\/"},"modified":"2024-03-22T12:00:56","modified_gmt":"2024-03-22T12:00:56","slug":"how-to-invoke-external-interfaces-in-java-backend","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-invoke-external-interfaces-in-java-backend\/","title":{"rendered":"How to invoke external interfaces in Java backend?"},"content":{"rendered":"<p>The Java backend can call external interfaces in several ways:<\/p>\n<ol>\n<li>Utilize the HttpURLConnection class in the Java standard library: The HttpURLConnection class in the Java standard library is used to send HTTP requests. This class allows for sending GET, POST, and other types of requests to external interfaces. It can be used to establish a connection with an external interface, send an HTTP request, and then retrieve the resulting response.<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-type\">URL<\/span> <span class=\"hljs-variable\">url<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">URL<\/span>(<span class=\"hljs-string\">\"http:\/\/example.com\/api\"<\/span>);\r\n<span class=\"hljs-type\">HttpURLConnection<\/span> <span class=\"hljs-variable\">conn<\/span> <span class=\"hljs-operator\">=<\/span> (HttpURLConnection) url.openConnection();\r\nconn.setRequestMethod(<span class=\"hljs-string\">\"GET\"<\/span>);\r\n\r\n<span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">responseCode<\/span> <span class=\"hljs-operator\">=<\/span> conn.getResponseCode();\r\n<span class=\"hljs-keyword\">if<\/span> (responseCode == HttpURLConnection.HTTP_OK) {\r\n    <span class=\"hljs-type\">BufferedReader<\/span> <span class=\"hljs-variable\">in<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">BufferedReader<\/span>(<span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">InputStreamReader<\/span>(conn.getInputStream()));\r\n    String inputLine;\r\n    <span class=\"hljs-type\">StringBuffer<\/span> <span class=\"hljs-variable\">response<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">StringBuffer<\/span>();\r\n    <span class=\"hljs-keyword\">while<\/span> ((inputLine = in.readLine()) != <span class=\"hljs-literal\">null<\/span>) {\r\n        response.append(inputLine);\r\n    }\r\n    in.close();\r\n    System.out.println(response.toString());\r\n} <span class=\"hljs-keyword\">else<\/span> {\r\n    System.out.println(<span class=\"hljs-string\">\"GET request failed\"<\/span>);\r\n}\r\n<\/code><\/pre>\n<ol>\n<li>Utilize third-party libraries like Apache HttpClient: Apache HttpClient is an open-source HTTP client library that simplifies sending and handling HTTP requests. This library can be used to send HTTP requests, call external APIs, and retrieve the results.<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-type\">CloseableHttpClient<\/span> <span class=\"hljs-variable\">httpClient<\/span> <span class=\"hljs-operator\">=<\/span> HttpClients.createDefault();\r\n<span class=\"hljs-type\">HttpGet<\/span> <span class=\"hljs-variable\">httpGet<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">HttpGet<\/span>(<span class=\"hljs-string\">\"http:\/\/example.com\/api\"<\/span>);\r\n<span class=\"hljs-type\">CloseableHttpResponse<\/span> <span class=\"hljs-variable\">response<\/span> <span class=\"hljs-operator\">=<\/span> httpClient.execute(httpGet);\r\n\r\n<span class=\"hljs-keyword\">try<\/span> {\r\n    <span class=\"hljs-type\">HttpEntity<\/span> <span class=\"hljs-variable\">entity<\/span> <span class=\"hljs-operator\">=<\/span> response.getEntity();\r\n    <span class=\"hljs-keyword\">if<\/span> (entity != <span class=\"hljs-literal\">null<\/span>) {\r\n        <span class=\"hljs-type\">String<\/span> <span class=\"hljs-variable\">result<\/span> <span class=\"hljs-operator\">=<\/span> EntityUtils.toString(entity);\r\n        System.out.println(result);\r\n    }\r\n} <span class=\"hljs-keyword\">finally<\/span> {\r\n    response.close();\r\n}\r\n<\/code><\/pre>\n<ol>\n<li>You can simplify sending and handling HTTP requests by using frameworks like Spring&#8217;s RestTemplate. RestTemplate is a template class specifically designed for sending HTTP requests, allowing you to easily call external APIs and retrieve the response.<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-type\">RestTemplate<\/span> <span class=\"hljs-variable\">restTemplate<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">RestTemplate<\/span>();\r\n<span class=\"hljs-type\">String<\/span> <span class=\"hljs-variable\">result<\/span> <span class=\"hljs-operator\">=<\/span> restTemplate.getForObject(<span class=\"hljs-string\">\"http:\/\/example.com\/api\"<\/span>, String.class);\r\nSystem.out.println(result);\r\n<\/code><\/pre>\n<p>In the above methods, you can choose the appropriate method to call the external interface based on specific needs.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The Java backend can call external interfaces in several ways: Utilize the HttpURLConnection class in the Java standard library: The HttpURLConnection class in the Java standard library is used to send HTTP requests. This class allows for sending GET, POST, and other types of requests to external interfaces. It can be used to establish a [&hellip;]<\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-27841","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to invoke external interfaces in Java backend? - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/blog\/how-to-invoke-external-interfaces-in-java-backend\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to invoke external interfaces in Java backend?\" \/>\n<meta property=\"og:description\" content=\"The Java backend can call external interfaces in several ways: Utilize the HttpURLConnection class in the Java standard library: The HttpURLConnection class in the Java standard library is used to send HTTP requests. 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It can be used to establish a [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/blog\/how-to-invoke-external-interfaces-in-java-backend\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/SiliCloudGlobal\/\" \/>\n<meta property=\"article:published_time\" content=\"2024-03-16T09:19:29+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-03-22T12:00:56+00:00\" \/>\n<meta name=\"author\" content=\"Ava Mitchell\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@SiliCloudGlobal\" \/>\n<meta name=\"twitter:site\" content=\"@SiliCloudGlobal\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Ava Mitchell\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-to-invoke-external-interfaces-in-java-backend\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-to-invoke-external-interfaces-in-java-backend\/\"},\"author\":{\"name\":\"Ava Mitchell\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/#\/schema\/person\/a3e2658c2cb9fb2be95ae0a8861f4a64\"},\"headline\":\"How to invoke external interfaces in Java backend?\",\"datePublished\":\"2024-03-16T09:19:29+00:00\",\"dateModified\":\"2024-03-22T12:00:56+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-to-invoke-external-interfaces-in-java-backend\/\"},\"wordCount\":171,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/#organization\"},\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-to-invoke-external-interfaces-in-java-backend\/\",\"url\":\"https:\/\/www.silicloud.com\/blog\/how-to-invoke-external-interfaces-in-java-backend\/\",\"name\":\"How to invoke external interfaces in Java backend? 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