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Java如何使用HTTPclient访问url获得数据

目录

  • 使用HTTPclient访问url获得数据
    • 1、使用get方法取得数据
    • 2、使用POST方法取得数据
  • 使用httpclient后台调用url方式

    使用HTTPclient访问url获得数据 最近项目上有个小功能需要调用第三方的http接口取数据，用到了HTTPclient，算是做个笔记吧！

    1、使用get方法取得数据
    /** * 根据URL试用get方法取得返回的数据 * @param url *URL地址，参数直接挂在URL后面即可 * @return */public static String getGetDateByUrl(String url){String data = https://www.it610.com/article/null; //构造HttpClient的实例HttpClient httpClient = new HttpClient(); //创建GET方法的实例GetMethod getMethod = new GetMethod(url); //设置头信息：如果不设置User-Agent可能会报405，导致取不到数据getMethod.setRequestHeader("User-Agent", "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:39.0) Gecko/20100101 Firefox/39.0"); //使用系统提供的默认的恢复策略getMethod.getParams().setParameter(HttpMethodParams.RETRY_HANDLER, new DefaultHttpMethodRetryHandler()); try{//开始执行getMethodint statusCode = httpClient.executeMethod(getMethod); if (statusCode != HttpStatus.SC_OK) {System.err.println("Method failed:" + getMethod.getStatusLine()); }//读取内容byte[] responseBody = getMethod.getResponseBody(); //处理内容data = https://www.it610.com/article/new String(responseBody); }catch (HttpException e){//发生异常，可能是协议不对或者返回的内容有问题System.out.println("Please check your provided http address!"); datahttps://www.it610.com/article/= ""; e.printStackTrace(); }catch(IOException e){//发生网络异常datahttps://www.it610.com/article/= ""; e.printStackTrace(); }finally{//释放连接getMethod.releaseConnection(); }return data; }


    2、使用POST方法取得数据
    /** * 根据post方法取得返回数据 * @param url *URL地址 * @param array *需要以post形式提交的参数 * @return */public static String getPostDateByUrl(String url,Map array){String data = https://www.it610.com/article/null; //构造HttpClient的实例HttpClient httpClient = new HttpClient(); //创建post方法的实例PostMethod postMethod = new PostMethod(url); //设置头信息postMethod.setRequestHeader("User-Agent", "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:39.0) Gecko/20100101 Firefox/39.0"); postMethod.addRequestHeader("Content-Type", "application/x-www-form-urlencoded; charset=utf-8"); //遍历设置要提交的参数Iterator it = array.entrySet().iterator(); while (it.hasNext()){Map.Entry entry =(Map.Entry) it.next(); String key = entry.getKey(); String value = https://www.it610.com/article/entry.getValue().trim(); postMethod.setParameter(key,value); }//使用系统提供的默认的恢复策略postMethod.getParams().setParameter(HttpMethodParams.RETRY_HANDLER, new DefaultHttpMethodRetryHandler()); try{//执行postMethodint statusCode = httpClient.executeMethod(postMethod); if (statusCode != HttpStatus.SC_OK) {System.err.println("Method failed:" + postMethod.getStatusLine()); }//读取内容byte[] responseBody = postMethod.getResponseBody(); //处理内容data = https://www.it610.com/article/new String(responseBody); }catch (HttpException e){//发生致命的异常，可能是协议不对或者返回的内容有问题System.out.println("Please check your provided http address!"); datahttps://www.it610.com/article/= ""; e.printStackTrace(); }catch(IOException e){//发生网络异常datahttps://www.it610.com/article/= ""; e.printStackTrace(); }finally{//释放连接postMethod.releaseConnection(); }System.out.println(data); return data; }


    使用httpclient后台调用url方式 使用httpclient调用后台的时候接收url类型的参数需要使用UrlDecoder解码，调用的时候需要对参数使用UrlEncoder对参数进行编码，然后调用。
    @SuppressWarnings("deprecation") @RequestMapping(value = "https://www.it610.com/wechatSigns", produces = "application/json; charset=utf-8") @ResponseBody public String wechatSigns(HttpServletRequest request, String p6, String p13) {Map ret = new HashMap(); try {System.out.println("*****************************************p6:"+p6); URLDecoder.decode(p13); System.out.println("*****************************************p13:"+p13); String p10 = "{\"p1\":\"1\",\"p2\":\"\",\"p6\":\"" + p6 + "\",\"p13\":\"" + p13 + "\"}"; p10 = URLEncoder.encode(p10, "utf-8"); String url = WebserviceUtil.getGetSignatureUrl() + "?p10=" + p10; String result = WebConnectionUtil.sendGetRequest(url); JSONObject fromObject = JSONObject.fromObject(URLDecoder.decode(result, "utf-8")); System.out.println(fromObject); String resultCode = JSONObject.fromObject(fromObject.getString("meta")).getString("result"); if ("0".equals(resultCode)) {JSONObject fromObject2 = JSONObject.fromObject(fromObject.get("data")); String timestamp = fromObject2.getString("timestamp"); String appId = fromObject2.getString("appId"); String nonceStr = fromObject2.getString("nonceStr"); String signature = fromObject2.getString("signature"); ret.put("timestamp", timestamp); ret.put("appId", appId); ret.put("nonceStr", nonceStr); ret.put("signature", signature); JSONObject jo = JSONObject.fromObject(ret); return ResultJsonBean.success(jo.toString()); } else {String resultMsg = JSONObject.fromObject(fromObject.getString("meta")).getString("errMsg"); return ResultJsonBean.fail(ConnectOauthCodeInfo.REQ_WECHATTOCKEN_CODE, resultMsg, ""); }} catch (Exception e) {logger.error(e, e); return ResultJsonBean.fail(ConnectOauthCodeInfo.REQ_WECHATREQERROE_CODE,ConnectOauthCodeInfo.REQ_WECHATREQERROE_CODE, ""); } }

    package com.dcits.djk.core.util; import java.io.BufferedInputStream; import java.io.BufferedOutputStream; import java.io.File; import java.io.FileOutputStream; import java.io.InputStream; import java.security.cert.CertificateException; import java.security.cert.X509Certificate; import java.util.ArrayList; import java.util.Iterator; import java.util.List; import java.util.Map; import java.util.Set; import javax.net.ssl.HostnameVerifier; import javax.net.ssl.SSLContext; import javax.net.ssl.SSLSession; import javax.net.ssl.TrustManager; import javax.net.ssl.X509TrustManager; import org.apache.http.HttpEntity; import org.apache.http.NameValuePair; 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.entity.StringEntity; import org.apache.http.entity.mime.MultipartEntityBuilder; 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 net.sf.json.JSONObject; public class WebConnectionUtil { public static String sendPostRequest(String url,Map paramMap,String userId){CloseableHttpClient httpclient=null; CloseableHttpResponse response=null; try{httpclient = HttpClients.createDefault(); HttpPost httppost = new HttpPost(url); List formparams = new ArrayList(); if(userId != null || "".equals(userId) ){formparams.add(new BasicNameValuePair("userId",userId)); }Set keSet=paramMap.entrySet(); for(Iterator itr=keSet.iterator(); itr.hasNext(); ){Map.Entry me=(Map.Entry)itr.next(); Object key=me.getKey(); Object valueObj=me.getValue(); String[] value=https://www.it610.com/article/new String[1]; if(valueObj == null){value[0] =""; }else{if(valueObj instanceof String[]){value=https://www.it610.com/article/(String[])valueObj; }else{value[0]=valueObj.toString(); }}for(int k=0; k formparams = new ArrayList(); Set keSet=paramMap.entrySet(); for(Iterator itr=keSet.iterator(); itr.hasNext(); ){Map.Entry me=(Map.Entry)itr.next(); Object key=me.getKey(); Object valueObj=me.getValue(); String[] value=https://www.it610.com/article/new String[1]; if(valueObj == null){value[0] =""; }else{if(valueObj instanceof String[]){value=https://www.it610.com/article/(String[])valueObj; }else{value[0]=valueObj.toString(); }}for(int k=0; k formparams = new ArrayList(); Set keSet=paramMap.entrySet(); for(Iterator itr=keSet.iterator(); itr.hasNext(); ){Map.Entry me=(Map.Entry)itr.next(); Object key=me.getKey(); Object valueObj=me.getValue(); String[] value=https://www.it610.com/article/new String[1]; if(valueObj == null){value[0] =""; }else{if(valueObj instanceof String[]){value=https://www.it610.com/article/(String[])valueObj; }else{value[0]=valueObj.toString(); }}for(int k=0; k
    【Java如何使用HTTPclient访问url获得数据】以上为个人经验，希望能给大家一个参考，也希望大家多多支持脚本之家。

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