记一次 Java 发送http请求的方式

最新推荐文章于 2025-05-10 15:06:27 发布

@晴空一鹤

最新推荐文章于 2025-05-10 15:06:27 发布

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文章标签： java

本文链接：https://blog.youkuaiyun.com/weixin_44949177/article/details/127490977

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这篇博客展示了如何使用RestTemplate进行HTTP GET和POST请求。`httpGet`方法简单地发送GET请求并获取响应内容。`httpPost`方法处理POST请求，而`sendPost`方法则详细地设置请求头，包括Content-Type和User-Agent，并处理了URL编码的表单数据。文章还包含了错误处理逻辑。

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1.使用 RestTemplate

public static String httpGet(String url){
		RestTemplate restTemplate=new RestTemplate();
		String result=restTemplate.exchange(url, HttpMethod.GET,null,String.class).getBody();
		return result;
	}

public static String httpPost(String url,String param){
		RestTemplate restTemplate=new RestTemplate();
		String body = restTemplate.postForEntity(url, param, String.class).getBody();
		return body;
	}

public static String sendPost(String URL, String json) {

		CloseableHttpClient client = HttpClients.createDefault();
		HttpPost post = new HttpPost(URL);
		post.setHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8");
		post.setHeader("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/98.0.4758.102 Safari/537.36");
		String result = "";
		try {
			List<NameValuePair> list=new ArrayList();
			list.add(new BasicNameValuePair("args",json));
			UrlEncodedFormEntity s = new UrlEncodedFormEntity(list,"UTF-8");
            s.setContentEncoding(new BasicHeader(HTTP.CONTENT_TYPE,
                    "application/x-www-form-urlencoded; charset=UTF-8"));
			s.setContentType(ContentType.APPLICATION_FORM_URLENCODED.toString());
			post.setEntity(s);

			// 发送请求
			HttpResponse httpResponse = client.execute(post);
			// 获取响应输入流
			InputStream inStream = httpResponse.getEntity().getContent();
			BufferedReader reader = new BufferedReader(new InputStreamReader(
				inStream, "utf-8"));
			StringBuilder strber = new StringBuilder();
			String line = null;
			while ((line = reader.readLine()) != null){
				strber.append(line + "\n");
			}
			inStream.close();
			result = strber.toString();
			System.out.println("调用成功返回结果----------->"+result);
			if (httpResponse.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
				System.out.println("请求服务器成功，做相应处理");
			} else {
				System.out.println("请求服务端失败");
			}
		} catch (Exception e) {
			System.out.println("请求异常");
			throw new RuntimeException(e);
		}
		return result;
	}