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使用JDK原生提供的net,無需其他jar包,代碼如下:
import com.alibaba.fastjson.JSON; import java.io.BufferedReader; import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStream; import java.net.HttpURLConnection; import java.net.URL; import java.util.HashMap; import java.util.Map; public class HttpTest1 { public static void main(String[] args) { HttpURLConnection con = null; BufferedReader buffer = null; StringBuffer resultBuffer = null; try { URL url = new URL("http://10.30.10.151:8012/gateway.do"); //得到連接對象 con = (HttpURLConnection) url.openConnection(); //設置請求類型 con.setRequestMethod("POST"); //設置Content-Type,此處根據(jù)實際情況確定 con.setRequestProperty("Content-Type", "application/x-www-form-urlencoded"); //允許寫出 con.setDoOutput(true); //允許讀入 con.setDoInput(true); //不使用緩存 con.setUseCaches(false); OutputStream os = con.getOutputStream(); Map paraMap = new HashMap(); paraMap.put("type", "wx"); paraMap.put("mchid", "10101"); //組裝入?yún)? os.write(("consumerAppId=test&serviceName=queryMerchantService¶ms=" + JSON.toJSONString(paraMap)).getBytes()); //得到響應碼 int responseCode = con.getResponseCode(); if (responseCode == HttpURLConnection.HTTP_OK) { //得到響應流 InputStream inputStream = con.getInputStream(); //將響應流轉換成字符串 resultBuffer = new StringBuffer(); String line; buffer = new BufferedReader(new InputStreamReader(inputStream, "GBK")); while ((line = buffer.readLine()) != null) { resultBuffer.append(line); } System.out.println("result:" + resultBuffer.toString()); } } catch (Exception e) { e.printStackTrace(); } } }
需要用到commons-httpclient-3.1.jar,maven依賴如下:
<dependency> <groupId>commons-httpclient</groupId> <artifactId>commons-httpclient</artifactId> <version>3.1</version> </dependency>
代碼如下:
import com.alibaba.fastjson.JSON; import org.apache.commons.httpclient.HttpClient; import org.apache.commons.httpclient.methods.PostMethod; import java.io.IOException; import java.util.HashMap; import java.util.Map; public class HttpTest2 { public static void main(String[] args) { HttpClient httpClient = new HttpClient(); PostMethod postMethod = new PostMethod("http://10.30.10.151:8012/gateway.do"); postMethod.addRequestHeader("accept", "*/*"); //設置Content-Type,此處根據(jù)實際情況確定 postMethod.addRequestHeader("Content-Type", "application/x-www-form-urlencoded"); //必須設置下面這個Header //添加請求參數(shù) Map paraMap = new HashMap(); paraMap.put("type", "wx"); paraMap.put("mchid", "10101"); postMethod.addParameter("consumerAppId", "test"); postMethod.addParameter("serviceName", "queryMerchantService"); postMethod.addParameter("params", JSON.toJSONString(paraMap)); String result = ""; try { int code = httpClient.executeMethod(postMethod); if (code == 200){ result = postMethod.getResponseBodyAsString(); System.out.println("result:" + result); } } catch (IOException e) { e.printStackTrace(); } } }
需要用到httpclient-4.5.6.jar,maven依賴如下:
<dependency> <groupId>org.apache.httpcomponents</groupId> <artifactId>httpclient</artifactId> <version>4.5.6</version> </dependency>
代碼如下:
import com.alibaba.fastjson.JSON; import org.apache.http.Consts; import org.apache.http.HttpEntity; import org.apache.http.NameValuePair; import org.apache.http.client.config.RequestConfig; import org.apache.http.client.entity.UrlEncodedFormEntity; import org.apache.http.client.methods.CloseableHttpResponse; import org.apache.http.client.methods.HttpPost; import org.apache.http.impl.client.CloseableHttpClient; import org.apache.http.impl.client.HttpClients; import org.apache.http.message.BasicNameValuePair; import org.apache.http.util.EntityUtils; import java.io.IOException; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; public class HttpTest3 { public static void main(String[] args) { int timeout = 120000; CloseableHttpClient httpClient = HttpClients.createDefault(); RequestConfig defaultRequestConfig = RequestConfig.custom().setConnectTimeout(timeout) .setConnectionRequestTimeout(timeout).setSocketTimeout(timeout).build(); HttpPost httpPost = null; List<NameValuePair> nvps = null; CloseableHttpResponse responses = null;// 命名沖突,換一個名字,response HttpEntity resEntity = null; String result; try { httpPost = new HttpPost("http://10.30.10.151:8012/gateway.do"); httpPost.setConfig(defaultRequestConfig); Map paraMap = new HashMap(); paraMap.put("type", "wx"); paraMap.put("mchid", "10101"); nvps = new ArrayList<NameValuePair>(); nvps.add(new BasicNameValuePair("consumerAppId", "test")); nvps.add(new BasicNameValuePair("serviceName", "queryMerchantService")); nvps.add(new BasicNameValuePair("params", JSON.toJSONString(paraMap))); httpPost.setEntity(new UrlEncodedFormEntity(nvps, Consts.UTF_8)); responses = httpClient.execute(httpPost); resEntity = responses.getEntity(); result = EntityUtils.toString(resEntity, Consts.UTF_8); EntityUtils.consume(resEntity); System.out.println("result:" + result); } catch (Exception e) { e.printStackTrace(); } finally { try { responses.close(); httpClient.close(); } catch (IOException e) { e.printStackTrace(); } } } }
需要用到okhttp-3.10.0.jar,maven依賴如下:
<dependency> <groupId>com.squareup.okhttp3</groupId> <artifactId>okhttp</artifactId> <version>3.10.0</version> </dependency>
代碼如下:
import com.alibaba.fastjson.JSON; import okhttp3.*; import java.io.IOException; import java.util.HashMap; import java.util.Map; public class HttpTest4 { public static void main(String[] args) throws IOException { String url = "http://10.30.10.151:8012/gateway.do"; OkHttpClient client = new OkHttpClient(); Map paraMap = new HashMap(); paraMap.put("yybh", "1231231"); RequestBody requestBody = new MultipartBody.Builder() .addFormDataPart("consumerAppId", "tst") .addFormDataPart("serviceName", "queryCipher") .addFormDataPart("params", JSON.toJSONString(paraMap)) .build(); Request request = new Request.Builder() .url(url) .post(requestBody) .addHeader("Content-Type", "application/x-www-form-urlencoded") .build(); Response response = client .newCall(request) .execute(); if (response.isSuccessful()) { System.out.println("result:" + response.body().string()); } else { throw new IOException("Unexpected code " + response); } } }
使用JDK原生提供的net,無需其他jar包
代碼如下:
import com.alibaba.fastjson.JSON; import java.io.IOException; import java.io.InputStream; import java.io.OutputStreamWriter; import java.net.Socket; import java.net.URLEncoder; import java.net.UnknownHostException; import java.util.ArrayList; import java.util.HashMap; import java.util.Map; public class HttpTest6 { private static String encoding = "utf-8"; public static void main(String[] args) { try { Map paraMap = new HashMap(); paraMap.put("yybh", "12312311"); String data = URLEncoder.encode("consumerAppId", "utf-8") + "=" + URLEncoder.encode("test", "utf-8") + "&" + URLEncoder.encode("serviceName", "utf-8") + "=" + URLEncoder.encode("queryCipher", "utf-8") + "&" + URLEncoder.encode("params", "utf-8") + "=" + URLEncoder.encode(JSON.toJSONString(paraMap), "utf-8"); Socket s = new Socket("10.30.10.151", 8012); OutputStreamWriter osw = new OutputStreamWriter(s.getOutputStream()); StringBuffer sb = new StringBuffer(); sb.append("POST /gateway.do HTTP/1.1\r\n"); sb.append("Host: 10.30.10.151:8012\r\n"); sb.append("Content-Length: " + data.length() + "\r\n"); sb.append("Content-Type: application/x-www-form-urlencoded\r\n"); //注,這里很關鍵。這里一定要一個回車換行,表示消息頭完,不然服務器會等待 sb.append("\r\n"); osw.write(sb.toString()); osw.write(data); osw.write("\r\n"); osw.flush(); //--輸出服務器傳回的消息的頭信息 InputStream is = s.getInputStream(); String line = null; int contentLength = 0;//服務器發(fā)送回來的消息長度 // 讀取所有服務器發(fā)送過來的請求參數(shù)頭部信息 do { line = readLine(is, 0); //如果有Content-Length消息頭時取出 if (line.startsWith("Content-Length")) { contentLength = Integer.parseInt(line.split(":")[1].trim()); } //打印請求部信息 System.out.print(line); //如果遇到了一個單獨的回車換行,則表示請求頭結束 } while (!line.equals("\r\n")); //--輸消息的體 System.out.print(readLine(is, contentLength)); //關閉流 is.close(); } catch (UnknownHostException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } /* * 這里我們自己模擬讀取一行,因為如果使用API中的BufferedReader時,它是讀取到一個回車換行后 * 才返回,否則如果沒有讀取,則一直阻塞,直接服務器超時自動關閉為止,如果此時還使用BufferedReader * 來讀時,因為讀到最后一行時,最后一行后不會有回車換行符,所以就會等待。如果使用服務器發(fā)送回來的 * 消息頭里的Content-Length來截取消息體,這樣就不會阻塞 * * contentLe 參數(shù) 如果為0時,表示讀頭,讀時我們還是一行一行的返回;如果不為0,表示讀消息體, * 時我們根據(jù)消息體的長度來讀完消息體后,客戶端自動關閉流,這樣不用先到服務器超時來關閉。 */ private static String readLine(InputStream is, int contentLe) throws IOException { ArrayList lineByteList = new ArrayList(); byte readByte; int total = 0; if (contentLe != 0) { do { readByte = (byte) is.read(); lineByteList.add(Byte.valueOf(readByte)); total++; } while (total < contentLe);//消息體讀還未讀完 } else { do { readByte = (byte) is.read(); lineByteList.add(Byte.valueOf(readByte)); } while (readByte != 10); } byte[] tmpByteArr = new byte[lineByteList.size()]; for (int i = 0; i < lineByteList.size(); i++) { tmpByteArr[i] = ((Byte) lineByteList.get(i)).byteValue(); } lineByteList.clear(); return new String(tmpByteArr, encoding); } }
RestTemplate 是由Spring提供的一個HTTP請求工具。比傳統(tǒng)的Apache和HttpCLient便捷許多,能夠大大提高客戶端的編寫效率。代碼如下:
import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.http.client.ClientHttpRequestFactory; import org.springframework.http.client.SimpleClientHttpRequestFactory; import org.springframework.web.client.RestTemplate; @Configuration public class RestTemplateConfig { @Bean public RestTemplate restTemplate(ClientHttpRequestFactory factory){ return new RestTemplate(factory); } @Bean public ClientHttpRequestFactory simpleClientHttpRequestFactory(){ SimpleClientHttpRequestFactory factory = new SimpleClientHttpRequestFactory(); factory.setConnectTimeout(15000); factory.setReadTimeout(5000); return factory; } } @Autowired RestTemplate restTemplate; @Test public void postTest() throws Exception { MultiValueMap<String, String> requestEntity = new LinkedMultiValueMap<>(); Map paraMap = new HashMap(); paraMap.put("type", "wx"); paraMap.put("mchid", "10101"); requestEntity.add("consumerAppId", "test"); requestEntity.add("serviceName", "queryMerchant"); requestEntity.add("params", JSON.toJSONString(paraMap)); RestTemplate restTemplate = new RestTemplate(); System.out.println(restTemplate.postForObject("http://10.30.10.151:8012/gateway.do", requestEntity, String.class)); }
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