Java工具类之在服务器发送HTTP请求

使用之前首先添加maven依赖或者是jar包

<dependency> <groupId>org.apache.httpcomponents</groupId> <artifactId>httpclient</artifactId> <version>4.5.2</version> </dependency> 

下面给出工具类代码，一个简单发送Get和Post请求的例子

public class HttpUtils { /* *发送简单post请求 */ public static JSONObject post(String url) { HttpPost post = new HttpPost(url); return getResult(post); } /* *发送带Header的post请求 */ public static JSONObject post(String url, Map<String, String> map) { HttpPost post = new HttpPost(url); if (!map.isEmpty()) { Set<Map.Entry<String, String>> entrys = map.entrySet(); for (Map.Entry<String, String> entry : entrys) { post.setHeader(entry.getKey(), entry.getValue()); } } return getResult(post); } /* *发送带Header的get请求 */ public static JSONObject get(String url, Map<String, String> map) { HttpGet get = new HttpGet(url); if (!map.isEmpty()) { Set<Map.Entry<String, String>> entrys = map.entrySet(); for (Map.Entry<String, String> entry : entrys) { get.setHeader(entry.getKey(), entry.getValue()); } } return getResult(get); } /* *发送简单的get请求 */ public static JSONObject get(String url) { HttpGet get = new HttpGet(url); return getResult(get); } /* *发送请求方法，请求响应为JSONObject */ private static JSONObject getResult(HttpRequestBase requestBase) { CloseableHttpClient httpClient = HttpClients.createDefault(); String result = null; try { result = EntityUtils.toString(httpClient.execute(requestBase).getEntity()); httpClient.close(); } catch (UnsupportedEncodingException e1) { e1.printStackTrace(); } catch (ClientProtocolException e1) { e1.printStackTrace(); } catch (IOException e1) { e1.printStackTrace(); } finally { return new JSONObject(JSON.parseObject(result)); } } /* *当请求响应为String时 */ public static String getString(String url) { CloseableHttpClient httpClient = HttpClients.createDefault(); HttpGet get = new HttpGet(url); String result = null; try { result = EntityUtils.toString(httpClient.execute(get).getEntity()); httpClient.close(); } catch (UnsupportedEncodingException e1) { e1.printStackTrace(); } catch (ClientProtocolException e1) { e1.printStackTrace(); } catch (IOException e1) { e1.printStackTrace(); } finally { return result; } } } 

<dependency> <groupId>org.apache.httpcomponents</groupId> <artifactId>httpclient</artifactId> <version>4.5.2</version> </dependency> 

public class HttpUtils { /* *发送简单post请求 */ public static JSONObject post(String url) { HttpPost post = new HttpPost(url); return getResult(post); } /* *发送带Header的post请求 */ public static JSONObject post(String url, Map<String, String> map) { HttpPost post = new HttpPost(url); if (!map.isEmpty()) { Set<Map.Entry<String, String>> entrys = map.entrySet(); for (Map.Entry<String, String> entry : entrys) { post.setHeader(entry.getKey(), entry.getValue()); } } return getResult(post); } /* *发送带Header的get请求 */ public static JSONObject get(String url, Map<String, String> map) { HttpGet get = new HttpGet(url); if (!map.isEmpty()) { Set<Map.Entry<String, String>> entrys = map.entrySet(); for (Map.Entry<String, String> entry : entrys) { get.setHeader(entry.getKey(), entry.getValue()); } } return getResult(get); } /* *发送简单的get请求 */ public static JSONObject get(String url) { HttpGet get = new HttpGet(url); return getResult(get); } /* *发送请求方法，请求响应为JSONObject */ private static JSONObject getResult(HttpRequestBase requestBase) { CloseableHttpClient httpClient = HttpClients.createDefault(); String result = null; try { result = EntityUtils.toString(httpClient.execute(requestBase).getEntity()); httpClient.close(); } catch (UnsupportedEncodingException e1) { e1.printStackTrace(); } catch (ClientProtocolException e1) { e1.printStackTrace(); } catch (IOException e1) { e1.printStackTrace(); } finally { return new JSONObject(JSON.parseObject(result)); } } /* *当请求响应为String时 */ public static String getString(String url) { CloseableHttpClient httpClient = HttpClients.createDefault(); HttpGet get = new HttpGet(url); String result = null; try { result = EntityUtils.toString(httpClient.execute(get).getEntity()); httpClient.close(); } catch (UnsupportedEncodingException e1) { e1.printStackTrace(); } catch (ClientProtocolException e1) { e1.printStackTrace(); } catch (IOException e1) { e1.printStackTrace(); } finally { return result; } } }