java發(fā)送HttpClient請求及接收請求結果過程的簡單實例
一.
1、寫一個HttpRequestUtils工具類,包括post請求和get請求
package com.brainlong.framework.util.httpclient; import net.sf.json.JSONObject; import org.apache.commons.httpclient.HttpStatus; import org.apache.http.HttpResponse; import org.apache.http.client.methods.HttpGet; import org.apache.http.client.methods.HttpPost; import org.apache.http.entity.StringEntity; import org.apache.http.impl.client.DefaultHttpClient;import org.apache.http.util.EntityUtils; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import java.io.IOException;import java.net.URLDecoder; public class HttpRequestUtils { private static Logger logger = LoggerFactory.getLogger(HttpRequestUtils.class); //日志記錄 /** * httpPost * @param url 路徑 * @param jsonParam 參數(shù) * @return */ public static JSONObject httpPost(String url,JSONObject jsonParam){ return httpPost(url, jsonParam, false); } /** * post請求 * @param url url地址 * @param jsonParam 參數(shù) * @param noNeedResponse 不需要返回結果 * @return */ public static JSONObject httpPost(String url,JSONObject jsonParam, boolean noNeedResponse){ //post請求返回結果 DefaultHttpClient httpClient = new DefaultHttpClient(); JSONObject jsonResult = null; HttpPost method = new HttpPost(url); try { if (null != jsonParam) { //解決中文亂碼問題 StringEntity entity = new StringEntity(jsonParam.toString(), "utf-8"); entity.setContentEncoding("UTF-8"); entity.setContentType("application/json"); method.setEntity(entity); } HttpResponse result = httpClient.execute(method); url = URLDecoder.decode(url, "UTF-8"); /**請求發(fā)送成功,并得到響應**/ if (result.getStatusLine().getStatusCode() == 200) { String str = ""; try { /**讀取服務器返回過來的json字符串數(shù)據(jù)**/ str = EntityUtils.toString(result.getEntity()); if (noNeedResponse) { return null; } /**把json字符串轉換成json對象**/ jsonResult = JSONObject.fromObject(str); } catch (Exception e) { logger.error("post請求提交失敗:" + url, e); } } } catch (IOException e) { logger.error("post請求提交失敗:" + url, e); } return jsonResult; } /** * 發(fā)送get請求 * @param url 路徑 * @return */ public static JSONObject httpGet(String url){ //get請求返回結果 JSONObject jsonResult = null; try { DefaultHttpClient client = new DefaultHttpClient(); //發(fā)送get請求 HttpGet request = new HttpGet(url); HttpResponse response = client.execute(request); /**請求發(fā)送成功,并得到響應**/ if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) { /**讀取服務器返回過來的json字符串數(shù)據(jù)**/ String strResult = EntityUtils.toString(response.getEntity()); /**把json字符串轉換成json對象**/ jsonResult = JSONObject.fromObject(strResult); url = URLDecoder.decode(url, "UTF-8"); } else { logger.error("get請求提交失敗:" + url); } } catch (IOException e) { logger.error("get請求提交失敗:" + url, e); } return jsonResult; }}
2、寫業(yè)務代碼發(fā)送Http請求
3、MVC配置文件設置Controller掃描目錄
<!-- 自動掃描且只掃描@Controller --> <context:component-scan base-package="com.wiselong.multichannel" use-default-filters="false"> <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller" /> </context:component-scan>
4、接收Http請求
接收post請求
@Controller @RequestMapping(value = "/api/platform/exceptioncenter/exceptioninfo") public class ExceptionInfoController { //注入 @Autowired private ExceptionInfoBiz exceptionInfoBiz; /** * 創(chuàng)建異常信息請求 * @param requestBody 請求消息內容 * @param request 請求消息頭 * @return jsonObject */ @RequestMapping( value="/create", method = RequestMethod.POST ) public ModelAndView createExceptionInfo(@RequestBody String requestBody, HttpServletRequest request) { JSONObject jsonObject = JSONObject.fromObject(requestBody); ComExceptionInfo comExceptionInfo = new ComExceptionInfo(); comExceptionInfo.setProjectName(jsonObject.getString("projectName")); comExceptionInfo.setTagName(jsonObject.getString("tagName")); exceptionInfoBiz.insert(comExceptionInfo); //返回請求結果 JSONObject result= new JSONObject(); result.put("success", "true"); return new ModelAndView("", ResponseUtilsHelper.jsonSuccess(result.toString())); } }
接收get請求
@Controller @RequestMapping(value="/api/platform/messagecenter/messages/sms") public class SmsController { @Autowired SmsSendBiz smsSendBiz; /** * 接收手機號碼和內容往短信發(fā)送表插入一條記錄 * @param requestbody 請求消息內容 * @param request 請求消息頭 * @return jsonObject */ @RequestMapping( value="/send", method= RequestMethod.GET ) public ModelAndView sendSms(@RequestBody String requestbody, HttpServletRequest request) { //獲取請求URL及url后面?zhèn)鬏數(shù)膮?shù) String url = request.getRequestURL() + "?" + request.getQueryString(); url = BuildRequestUrl.decodeUrl(url); String telePhone = RequestUtils.getStringValue(request, "telePhone"); String content = RequestUtils.getStringValue(request, "content"); smsSendBiz.insertTtMsQuequ(telePhone,content); return new ModelAndView("", ResponseUtilsHelper.jsonResult("", true)); } }
二.
get
import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import org.apache.commons.httpclient.HttpClient; import org.apache.commons.httpclient.HttpMethod; import org.apache.commons.httpclient.methods.GetMethod; public class H_client_get { public static void main(String[] args) throws IOException { // new類對象 HttpClient client = new HttpClient(); // 使用 GET 方法 與URL服務器進行交互 // HttpMethod method = new GetMethod("http://192.168.111.128/bak/regist.php?email=admin@admin.com&password=1234567&re_password=1234567&username=admin&nickname=管理員"); HttpMethod method = new GetMethod("http://192.168.111.128/bak/login.php?username="); // 使用 GET 方法 ,實行與url服務器連接 client.executeMethod(method); // 數(shù)據(jù)流輸出 // method.getResponseBodyAsStream 創(chuàng)建字節(jié)流對象為inputStream InputStream inputStream = method.getResponseBodyAsStream(); // InputStreamReader(inputStream)字節(jié)流轉換成字符流 BufferedReader封裝成帶有緩沖的字符流對象了 BufferedReader br = new BufferedReader(new InputStreamReader(inputStream,"UTF-8")); // StringBuffer是字符串變量,它的對象是可以擴充和修改的 創(chuàng)建一個空的StringBuffer類的對象 StringBuffer stringBuffer = new StringBuffer(); // 定義字符串常量 String str= ""; // br字符流賦值給str字符串常量 str不等于空 按行輸出 while((str = br.readLine()) != null){ // StringBuffer 是字符串變量,它的對象是可以擴充和修改的 將str數(shù)據(jù)賦予 stringBuffer stringBuffer .append(str ); } // 按照字符串循環(huán)輸出stringBuffer System.out.println(stringBuffer.toString()); // 關閉method 的 httpclient連接 method.releaseConnection(); } }
post
import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import org.apache.commons.httpclient.methods.PostMethod; import org.apache.commons.httpclient.*; public class H_client_post { public static void main(String[] args) throws IOException { HttpClient client = new HttpClient(); PostMethod method = new PostMethod("http://192.168.111.128/bak/login_post.php"); //表單域的值,既post傳入的key=value NameValuePair[] date = { new NameValuePair("username","admin"),new NameValuePair("password","123457")}; //method使用表單閾值 method.setRequestBody(date); //提交表單 client.executeMethod(method); //字符流轉字節(jié)流 循環(huán)輸出,同get解釋 InputStream inputStream = method.getResponseBodyAsStream(); BufferedReader br = new BufferedReader(new InputStreamReader(inputStream,"UTF-8")); StringBuffer stringBuffer = new StringBuffer(); String str= ""; while((str = br.readLine()) != null){ stringBuffer .append(str ); } System.out.println(stringBuffer.toString()); method.releaseConnection(); } }
三.
Http協(xié)議的重要性相信不用我多說了,HttpClient相比傳統(tǒng)JDK自帶的URLConnection,增加了易用性和靈活性(具體區(qū)別,日后我們再討論),它不僅是客戶端發(fā)送Http請求變得容易,而且也方便了開發(fā)人員測試接口(基于Http協(xié)議的),即提高了開發(fā)的效率,也方便提高代碼的健壯性。因此熟練掌握HttpClient是很重要的必修內容,掌握HttpClient后,相信對于Http協(xié)議的了解會更加深入。
一、簡介
HttpClient是Apache Jakarta Common下的子項目,用來提供高效的、最新的、功能豐富的支持HTTP協(xié)議的客戶端編程工具包,并且它支持HTTP協(xié)議最新的版本和建議。HttpClient已經應用在很多的項目中,比如Apache Jakarta上很著名的另外兩個開源項目Cactus和HTMLUnit都使用了HttpClient。
二、特性
1. 基于標準、純凈的java語言。實現(xiàn)了Http1.0和Http1.1
2. 以可擴展的面向對象的結構實現(xiàn)了Http全部的方法(GET, POST, PUT, DELETE, HEAD, OPTIONS, and TRACE)。
3. 支持HTTPS協(xié)議。
4. 通過Http代理建立透明的連接。
5. 利用CONNECT方法通過Http代理建立隧道的https連接。
6. Basic, Digest, NTLMv1, NTLMv2, NTLM2 Session, SNPNEGO/Kerberos認證方案。
7. 插件式的自定義認證方案。
8. 便攜可靠的套接字工廠使它更容易的使用第三方解決方案。
9. 連接管理器支持多線程應用。支持設置最大連接數(shù),同時支持設置每個主機的最大連接數(shù),發(fā)現(xiàn)并關閉過期的連接。
10. 自動處理Set-Cookie中的Cookie。
11. 插件式的自定義Cookie策略。
12. Request的輸出流可以避免流中內容直接緩沖到socket服務器。
13. Response的輸入流可以有效的從socket服務器直接讀取相應內容。
14. 在http1.0和http1.1中利用KeepAlive保持持久連接。
15. 直接獲取服務器發(fā)送的response code和 headers。
16. 設置連接超時的能力。
17. 實驗性的支持http1.1 response caching。
18. 源代碼基于Apache License 可免費獲取。
三、使用方法
使用HttpClient發(fā)送請求、接收響應很簡單,一般需要如下幾步即可。
1. 創(chuàng)建HttpClient對象。
2. 創(chuàng)建請求方法的實例,并指定請求URL。如果需要發(fā)送GET請求,創(chuàng)建HttpGet對象;如果需要發(fā)送POST請求,創(chuàng)建HttpPost對象。
3. 如果需要發(fā)送請求參數(shù),可調用HttpGet、HttpPost共同的setParams(HetpParams params)方法來添加請求參數(shù);對于HttpPost對象而言,也可調用setEntity(HttpEntity entity)方法來設置請求參數(shù)。
4. 調用HttpClient對象的execute(HttpUriRequest request)發(fā)送請求,該方法返回一個HttpResponse。
5. 調用HttpResponse的getAllHeaders()、getHeaders(String name)等方法可獲取服務器的響應頭;調用HttpResponse的getEntity()方法可獲取HttpEntity對象,該對象包裝了服務器的響應內容。程序可通過該對象獲取服務器的響應內容。
6. 釋放連接。無論執(zhí)行方法是否成功,都必須釋放連接
四、實例
package com.test; import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.io.UnsupportedEncodingException; import java.security.KeyManagementException; import java.security.KeyStore; import java.security.KeyStoreException; import java.security.NoSuchAlgorithmException; import java.security.cert.CertificateException; import java.util.ArrayList; import java.util.List; import javax.net.ssl.SSLContext; import org.apache.http.HttpEntity; import org.apache.http.NameValuePair; import org.apache.http.ParseException; import org.apache.http.client.ClientProtocolException; import org.apache.http.client.entity.UrlEncodedFormEntity; import org.apache.http.client.methods.CloseableHttpResponse; import org.apache.http.client.methods.HttpGet; import org.apache.http.client.methods.HttpPost; import org.apache.http.conn.ssl.SSLConnectionSocketFactory; import org.apache.http.conn.ssl.SSLContexts; import org.apache.http.conn.ssl.TrustSelfSignedStrategy; import org.apache.http.entity.ContentType; import org.apache.http.entity.mime.MultipartEntityBuilder; import org.apache.http.entity.mime.content.FileBody; import org.apache.http.entity.mime.content.StringBody; 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 org.junit.Test; public class HttpClientTest { @Test public void jUnitTest() { get(); } /** * HttpClient連接SSL */ public void ssl() { CloseableHttpClient httpclient = null; try { KeyStore trustStore = KeyStore.getInstance(KeyStore.getDefaultType()); FileInputStream instream = new FileInputStream(new File("d:\\tomcat.keystore")); try { 54. // 加載keyStore d:\\tomcat.keystore trustStore.load(instream, "123456".toCharArray()); } catch (CertificateException e) { e.printStackTrace(); } finally { try { instream.close(); } catch (Exception ignore) { } } // 相信自己的CA和所有自簽名的證書 SSLContext sslcontext = SSLContexts.custom().loadTrustMaterial(trustStore, new TrustSelfSignedStrategy()).build(); // 只允許使用TLSv1協(xié)議 SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(sslcontext, new String[] { "TLSv1" }, null, SSLConnectionSocketFactory.BROWSER_COMPATIBLE_HOSTNAME_VERIFIER); httpclient = HttpClients.custom().setSSLSocketFactory(sslsf).build(); // 創(chuàng)建http請求(get方式) HttpGet httpget = new HttpGet("https://localhost:8443/myDemo/Ajax/serivceJ.action"); System.out.println("executing request" + httpget.getRequestLine()); CloseableHttpResponse response = httpclient.execute(httpget); try { HttpEntity entity = response.getEntity(); System.out.println("----------------------------------------"); System.out.println(response.getStatusLine()); if (entity != null) { System.out.println("Response content length: " + entity.getContentLength()); System.out.println(EntityUtils.toString(entity)); EntityUtils.consume(entity); } } finally { response.close(); } } catch (ParseException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } catch (KeyManagementException e) { e.printStackTrace(); } catch (NoSuchAlgorithmException e) { e.printStackTrace(); } catch (KeyStoreException e) { e.printStackTrace(); } finally { if (httpclient != null) { try { httpclient.close(); } catch (IOException e) { e.printStackTrace(); } } } } /** * post方式提交表單(模擬用戶登錄請求) */ public void postForm() { // 創(chuàng)建默認的httpClient實例. CloseableHttpClient httpclient = HttpClients.createDefault(); // 創(chuàng)建httppost HttpPost httppost = new HttpPost("http://localhost:8080/myDemo/Ajax/serivceJ.action"); // 創(chuàng)建參數(shù)隊列 List<namevaluepair> formparams = new ArrayList<namevaluepair>(); formparams.add(new BasicNameValuePair("username", "admin")); formparams.add(new BasicNameValuePair("password", "123456")); UrlEncodedFormEntity uefEntity; try { uefEntity = new UrlEncodedFormEntity(formparams, "UTF-8"); httppost.setEntity(uefEntity); System.out.println("executing request " + httppost.getURI()); CloseableHttpResponse response = httpclient.execute(httppost); try { HttpEntity entity = response.getEntity(); if (entity != null) { System.out.println("--------------------------------------"); System.out.println("Response content: " + EntityUtils.toString(entity, "UTF-8")); System.out.println("--------------------------------------"); } } finally { response.close(); } } catch (ClientProtocolException e) { e.printStackTrace(); } catch (UnsupportedEncodingException e1) { e1.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } finally { // 關閉連接,釋放資源 try { httpclient.close(); } catch (IOException e) { e.printStackTrace(); } } } /** * 發(fā)送 post請求訪問本地應用并根據(jù)傳遞參數(shù)不同返回不同結果 */ public void post() { // 創(chuàng)建默認的httpClient實例. CloseableHttpClient httpclient = HttpClients.createDefault(); // 創(chuàng)建httppost HttpPost httppost = new HttpPost("http://localhost:8080/myDemo/Ajax/serivceJ.action"); // 創(chuàng)建參數(shù)隊列 List<namevaluepair> formparams = new ArrayList<namevaluepair>(); formparams.add(new BasicNameValuePair("type", "house")); UrlEncodedFormEntity uefEntity; try { uefEntity = new UrlEncodedFormEntity(formparams, "UTF-8"); httppost.setEntity(uefEntity); System.out.println("executing request " + httppost.getURI()); CloseableHttpResponse response = httpclient.execute(httppost); try { HttpEntity entity = response.getEntity(); if (entity != null) { System.out.println("--------------------------------------"); System.out.println("Response content: " + EntityUtils.toString(entity, "UTF-8")); System.out.println("--------------------------------------"); } } finally { response.close(); } } catch (ClientProtocolException e) { e.printStackTrace(); } catch (UnsupportedEncodingException e1) { e1.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } finally { // 關閉連接,釋放資源 try { httpclient.close(); } catch (IOException e) { e.printStackTrace(); } } } /** * 發(fā)送 get請求 */ public void get() { CloseableHttpClient httpclient = HttpClients.createDefault(); try { // 創(chuàng)建httpget. HttpGet httpget = new HttpGet("http://www.baidu.com/"); System.out.println("executing request " + httpget.getURI()); // 執(zhí)行get請求. CloseableHttpResponse response = httpclient.execute(httpget); try { // 獲取響應實體 HttpEntity entity = response.getEntity(); System.out.println("--------------------------------------"); // 打印響應狀態(tài) System.out.println(response.getStatusLine()); if (entity != null) { // 打印響應內容長度 System.out.println("Response content length: " + entity.getContentLength()); // 打印響應內容 System.out.println("Response content: " + EntityUtils.toString(entity)); } System.out.println("------------------------------------"); } finally { response.close(); } } catch (ClientProtocolException e) { e.printStackTrace(); } catch (ParseException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } finally { // 關閉連接,釋放資源 try { httpclient.close(); } catch (IOException e) { e.printStackTrace(); } } } /** * 上傳文件 */ public void upload() { CloseableHttpClient httpclient = HttpClients.createDefault(); try { HttpPost httppost = new HttpPost("http://localhost:8080/myDemo/Ajax/serivceFile.action"); FileBody bin = new FileBody(new File("F:\\image\\sendpix0.jpg")); StringBody comment = new StringBody("A binary file of some kind", ContentType.TEXT_PLAIN); HttpEntity reqEntity = MultipartEntityBuilder.create().addPart("bin", bin).addPart("comment", comment).build(); httppost.setEntity(reqEntity); System.out.println("executing request " + httppost.getRequestLine()); CloseableHttpResponse response = httpclient.execute(httppost); try { System.out.println("----------------------------------------"); System.out.println(response.getStatusLine()); HttpEntity resEntity = response.getEntity(); if (resEntity != null) { System.out.println("Response content length: " + resEntity.getContentLength()); } EntityUtils.consume(resEntity); } finally { response.close(); } } catch (ClientProtocolException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } finally { try { httpclient.close(); } catch (IOException e) { e.printStackTrace(); } } } }</namevaluepair></namevaluepair></namevaluepair></namevaluepair>
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