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
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/** * 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 = 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getMethod int 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 = 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!" ); data = "" ; e.printStackTrace(); } catch (IOException e){ //发生网络异常 data = "" ; e.printStackTrace(); } finally { //释放连接 getMethod.releaseConnection(); } return data; } |
2、使用POST方法取得数据
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/** * 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<String ,String> array){ String data = 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<String,String> entry =(Map.Entry) it.next(); String key = entry.getKey(); String value = 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postMethod int 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 = 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!" ); data = "" ; e.printStackTrace(); } catch (IOException e){ //发生网络异常 data = "" ; 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。
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@SuppressWarnings ( "deprecation" ) @RequestMapping (value = "/wechatSigns" , produces = "application/json;charset=utf-8" ) @ResponseBody public String wechatSigns(HttpServletRequest request, String p6, String p13) { Map<String, String> ret = new HashMap<String, String>(); 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, "" ); } } |
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<pre name= "code" class = "java" > 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<NameValuePair> formparams = new ArrayList<NameValuePair>(); 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= new String[ 1 ]; if (valueObj == null ){ value[ 0 ] = "" ; } else { if (valueObj instanceof String[]){ value=(String[])valueObj; } else { value[ 0 ]=valueObj.toString(); } } for ( int k= 0 ;k<value.length;k++){ formparams.add( new BasicNameValuePair(key.toString(),StringUtil.filterSpecialChar(value[k]))); } } UrlEncodedFormEntity uefEntity = new UrlEncodedFormEntity(formparams, "UTF-8" ); httppost.setEntity(uefEntity);
response = httpclient.execute(httppost); if (response.getStatusLine().getStatusCode() == 200 ){ HttpEntity entity = response.getEntity(); String resultInfo = EntityUtils.toString(entity, "UTF-8" ); return resultInfo; } else { return response.getStatusLine().getStatusCode() + "" ; } } catch (Exception e){ e.printStackTrace(); } finally { try { if (httpclient != null ){ httpclient.close(); } } catch (Exception e) { e.printStackTrace(); } try { if (response != null ){ response.close(); } } catch (Exception e) { e.printStackTrace(); } } return "404" ; }
public static String sendPostRequest(String url,Map paramMap){ CloseableHttpClient httpclient= null ; CloseableHttpResponse response= null ;
try { httpclient = HttpClients.createDefault(); HttpPost httppost = new HttpPost(url); List<NameValuePair> formparams = new ArrayList<NameValuePair>(); 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= new String[ 1 ]; if (valueObj == null ){ value[ 0 ] = "" ; } else { if (valueObj instanceof String[]){ value=(String[])valueObj; } else { value[ 0 ]=valueObj.toString(); } } for ( int k= 0 ;k<value.length;k++){ formparams.add( new BasicNameValuePair(key.toString(),StringUtil.filterSpecialChar(value[k]))); } } UrlEncodedFormEntity uefEntity = new UrlEncodedFormEntity(formparams, "UTF-8" ); httppost.setEntity(uefEntity);
response = httpclient.execute(httppost); if (response.getStatusLine().getStatusCode() == 200 ){ HttpEntity entity = response.getEntity(); String resultInfo = EntityUtils.toString(entity, "UTF-8" ); return resultInfo; } else { return response.getStatusLine().getStatusCode() + "" ; } } catch (Exception e){ e.printStackTrace(); } finally { try { if (httpclient != null ){ httpclient.close(); } } catch (Exception e) { e.printStackTrace(); } try { if (response != null ){ response.close(); } } catch (Exception e) { e.printStackTrace(); } } return "404" ; }
public static String downloadFileToImgService(String remoteUtl,String imgUrl,String tempUrl){ CloseableHttpClient httpclientRemote= null ; CloseableHttpResponse responseRemote= null ; CloseableHttpClient httpclientImg= null ; CloseableHttpResponse responseImg= null ; try { httpclientRemote = HttpClients.createDefault(); HttpGet httpgetRemote = new HttpGet(remoteUtl);
responseRemote = httpclientRemote.execute(httpgetRemote); if (responseRemote.getStatusLine().getStatusCode() != 200 ){ return "" ; } HttpEntity resEntityRemote = responseRemote.getEntity(); InputStream isRemote = resEntityRemote.getContent(); //写入文件 File file = null ;
boolean isDownSuccess = true ; BufferedOutputStream bos = null ; try { BufferedInputStream bif = new BufferedInputStream(isRemote); byte bf[] = new byte [ 28 ]; bif.read(bf); String suffix = FileTypeUtil.getSuffix(bf); file = new File(tempUrl + "/" + UuidUtil.get32Uuid()+suffix); bos = new BufferedOutputStream( new FileOutputStream(file)); if (!file.exists()){ file.createNewFile(); } bos.write(bf, 0 , 28 ); byte b[] = new byte [ 1024 * 3 ]; int len = 0 ; while ((len=bif.read(b)) != - 1 ){ bos.write(b, 0 , len); } } catch (Exception e){ e.printStackTrace(); isDownSuccess = false ; } finally { try { if (bos != null ){ bos.close(); } } catch (Exception e) { e.printStackTrace(); } } if (!isDownSuccess){ return "" ; }
httpclientImg = HttpClients.createDefault(); HttpPost httpPostImg = new HttpPost(imgUrl); MultipartEntityBuilder requestEntity = MultipartEntityBuilder.create(); requestEntity.addBinaryBody( "userFile" , file);
HttpEntity httprequestImgEntity = requestEntity.build(); httpPostImg.setEntity(httprequestImgEntity); responseImg = httpclientImg.execute(httpPostImg); if (responseImg.getStatusLine().getStatusCode() != 200 ){ return "" ; } HttpEntity entity = responseImg.getEntity(); String json = EntityUtils.toString(entity, "UTF-8" ); json = json.replaceAll( "\"" , "" ); String[] jsonMap = json.split( "," ); String resultInfo = "" ; for ( int i = 0 ;i < jsonMap.length;i++){ String str = jsonMap[i]; if (str.startsWith( "url:" )){ resultInfo = str.substring( 4 ); } else if (str.startsWith( "{url:" )){ resultInfo = str.substring( 5 ); } } if (resultInfo.endsWith( "}" )){ resultInfo = resultInfo.substring( 0 ,resultInfo.length()- 1 ); } try { if (file != null ){ file.delete(); } } catch (Exception e){ e.printStackTrace(); } return resultInfo; } catch (Exception e){ e.printStackTrace(); } finally { try { if (httpclientRemote != null ){ httpclientRemote.close(); } } catch (Exception e) { e.printStackTrace(); } try { if (responseRemote != null ){ responseRemote.close(); } } catch (Exception e) { e.printStackTrace(); } try { if (httpclientImg != null ){ httpclientImg.close(); } } catch (Exception e) { e.printStackTrace(); } try { if (responseImg != null ){ responseImg.close(); } } catch (Exception e) { e.printStackTrace(); } } return "" ; }
public static String downloadFileToImgService(File file,String imgUrl){ CloseableHttpClient httpclientImg= null ; CloseableHttpResponse responseImg= null ; try { httpclientImg = HttpClients.createDefault(); HttpPost httpPostImg = new HttpPost(imgUrl); MultipartEntityBuilder requestEntity = MultipartEntityBuilder.create(); requestEntity.addBinaryBody( "userFile" , file);
HttpEntity httprequestImgEntity = requestEntity.build(); httpPostImg.setEntity(httprequestImgEntity); responseImg = httpclientImg.execute(httpPostImg); if (responseImg.getStatusLine().getStatusCode() != 200 ){ return "" ; } HttpEntity entity = responseImg.getEntity(); String json = EntityUtils.toString(entity, "UTF-8" ); json = json.replaceAll( "\"" , "" ); String[] jsonMap = json.split( "," ); String resultInfo = "" ; for ( int i = 0 ;i < jsonMap.length;i++){ String str = jsonMap[i]; if (str.startsWith( "url:" )){ resultInfo = str.substring( 4 ); } else if (str.startsWith( "{url:" )){ resultInfo = str.substring( 5 ); } } if (resultInfo.endsWith( "}" )){ resultInfo = resultInfo.substring( 0 ,resultInfo.length()- 1 ); } return resultInfo; } catch (Exception e){ e.printStackTrace(); } finally { try { if (httpclientImg != null ){ httpclientImg.close(); } } catch (Exception e) { e.printStackTrace(); } try { if (responseImg != null ){ responseImg.close(); } } catch (Exception e) { e.printStackTrace(); } } return "" ; }
public static String sendGetRequest(String url){ CloseableHttpClient httpclient= null ; CloseableHttpResponse response= null ; try { httpclient = HttpClients.createDefault(); HttpGet httpGet = new HttpGet(url);
response = httpclient.execute(httpGet); if (response.getStatusLine().getStatusCode() == 200 ){ HttpEntity entity = response.getEntity(); String resultInfo = EntityUtils.toString(entity, "UTF-8" ); return resultInfo; } else { return response.getStatusLine().getStatusCode() + "" ; } } catch (Exception e){ e.printStackTrace(); } finally { try { if (httpclient != null ){ httpclient.close(); } } catch (Exception e) { e.printStackTrace(); } try { if (response != null ){ response.close(); } } catch (Exception e) { e.printStackTrace(); } } return "404" ; }
public static String sendHttpsPostRequestUseStream(String url,String param){ CloseableHttpClient httpclient= null ; CloseableHttpResponse response= null ; try { SSLContext ctx = SSLContext.getInstance( "TLS" ); X509TrustManager xtm = new X509TrustManager() { public void checkClientTrusted(X509Certificate[] chain, String authType) throws CertificateException {
}
public void checkServerTrusted(X509Certificate[] chain, String authType) throws CertificateException {
}
public X509Certificate[] getAcceptedIssuers() { return null ; } }; TrustManager[] tm = {xtm}; ctx.init( null ,tm, null ); HostnameVerifier hv = new HostnameVerifier(){ public boolean verify(String arg0, SSLSession arg1) { return true ; } }; httpclient = HttpClients.custom().setSSLHostnameVerifier(hv).setSSLContext(ctx).build(); HttpPost httpPost = new HttpPost(url); StringEntity strEntity = new StringEntity(param, "utf-8" ); httpPost.setEntity(strEntity);
response = httpclient.execute(httpPost); if (response.getStatusLine().getStatusCode() == 200 ){ HttpEntity entity = response.getEntity(); String resultInfo = EntityUtils.toString(entity, "UTF-8" ); return resultInfo; } else { return response.getStatusLine().getStatusCode() + "" ; } } catch (Exception e){ e.printStackTrace(); } finally { try { if (httpclient != null ){ httpclient.close(); } } catch (Exception e) { e.printStackTrace(); } try { if (response != null ){ response.close(); } } catch (Exception e) { e.printStackTrace(); } } return "404" ; }
public static String sendHttpsPostRequestUseStream(String url,Map paramMap){ CloseableHttpClient httpclient= null ; CloseableHttpResponse response= null ; try { SSLContext ctx = SSLContext.getInstance( "TLS" ); X509TrustManager xtm = new X509TrustManager() { public void checkClientTrusted(X509Certificate[] chain, String authType) throws CertificateException {
}
public void checkServerTrusted(X509Certificate[] chain, String authType) throws CertificateException {
}
public X509Certificate[] getAcceptedIssuers() { return null ; } }; TrustManager[] tm = {xtm}; ctx.init( null ,tm, null ); HostnameVerifier hv = new HostnameVerifier(){ public boolean verify(String arg0, SSLSession arg1) { return true ; } }; httpclient = HttpClients.custom().setSSLHostnameVerifier(hv).setSSLContext(ctx).build(); HttpPost httpPost = new HttpPost(url); List<NameValuePair> formparams = new ArrayList<NameValuePair>(); 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= new String[ 1 ]; if (valueObj == null ){ value[ 0 ] = "" ; } else { if (valueObj instanceof String[]){ value=(String[])valueObj; } else { value[ 0 ]=valueObj.toString(); } } for ( int k= 0 ;k<value.length;k++){ formparams.add( new BasicNameValuePair(key.toString(),StringUtil.filterSpecialChar(value[k]))); } } UrlEncodedFormEntity uefEntity = new UrlEncodedFormEntity(formparams, "UTF-8" ); httpPost.setEntity(uefEntity);
response = httpclient.execute(httpPost); if (response.getStatusLine().getStatusCode() == 200 ){ HttpEntity entity = response.getEntity(); String resultInfo = EntityUtils.toString(entity, "UTF-8" ); return resultInfo; } else { return response.getStatusLine().getStatusCode() + "" ; } } catch (Exception e){ e.printStackTrace(); } finally { try { if (httpclient != null ){ httpclient.close(); } } catch (Exception e) { e.printStackTrace(); } try { if (response != null ){ response.close(); } } catch (Exception e) { e.printStackTrace(); } } return "404" ; }
public static String sendHttpsGetRequestUseStream(String url){ CloseableHttpClient httpclient= null ; CloseableHttpResponse response= null ; try { SSLContext ctx = SSLContext.getInstance( "TLS" ); X509TrustManager xtm = new X509TrustManager() { public void checkClientTrusted(X509Certificate[] chain, String authType) throws CertificateException {
}
public void checkServerTrusted(X509Certificate[] chain, String authType) throws CertificateException {
}
public X509Certificate[] getAcceptedIssuers() { return null ; } }; TrustManager[] tm = {xtm}; ctx.init( null ,tm, null ); HostnameVerifier hv = new HostnameVerifier(){ public boolean verify(String arg0, SSLSession arg1) { return true ; } }; httpclient = HttpClients.custom().setSSLHostnameVerifier(hv).setSSLContext(ctx).build(); HttpGet httpGet = new HttpGet(url);
response = httpclient.execute(httpGet); if (response.getStatusLine().getStatusCode() == 200 ){ HttpEntity entity = response.getEntity(); String resultInfo = EntityUtils.toString(entity, "UTF-8" ); return resultInfo; } else { return response.getStatusLine().getStatusCode() + "" ; } } catch (Exception e){ e.printStackTrace(); } finally { try { if (httpclient != null ){ httpclient.close(); } } catch (Exception e) { e.printStackTrace(); } try { if (response != null ){ response.close(); } } catch (Exception e) { e.printStackTrace(); } } return "404" ; }
public static String sendHttpsPostRequestUseStreamForYZL(String url,OauthToken param){ CloseableHttpClient httpclient= null ; CloseableHttpResponse response= null ; try { SSLContext ctx = SSLContext.getInstance( "TLS" ); X509TrustManager xtm = new X509TrustManager() { public void checkClientTrusted(X509Certificate[] chain, String authType) throws CertificateException {
}
public void checkServerTrusted(X509Certificate[] chain, String authType) throws CertificateException {
}
public X509Certificate[] getAcceptedIssuers() { return null ; } }; TrustManager[] tm = {xtm}; ctx.init( null ,tm, null ); HostnameVerifier hv = new HostnameVerifier(){ public boolean verify(String arg0, SSLSession arg1) { return true ; } }; httpclient = HttpClients.custom().setSSLHostnameVerifier(hv).setSSLContext(ctx).build(); HttpPost httpPost = new HttpPost(url); StringEntity strEntity = new StringEntity(param.toString(), "utf-8" ); httpPost.setEntity(strEntity); httpPost.addHeader( "Content-Type" , "application/x-www-form-urlencoded" );
response = httpclient.execute(httpPost); if (response.getStatusLine().getStatusCode() == 200 ){ HttpEntity entity = response.getEntity(); String resultInfo = EntityUtils.toString(entity, "UTF-8" ); return resultInfo; } else { return response.getStatusLine().getStatusCode() + "" ; } } catch (Exception e){ e.printStackTrace(); } finally { try { if (httpclient != null ){ httpclient.close(); } } catch (Exception e) { e.printStackTrace(); } try { if (response != null ){ response.close(); } } catch (Exception e) { e.printStackTrace(); } } return "404" ; } } |
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。
原文链接：https://HdhCmsTestiteye测试数据/blog/quainter-2231502
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