Java如何使用httpclient检测url状态及链接是否能打开
作者：西凉的悲伤
这篇文章主要介绍了Java如何使用httpclient检测url状态及链接是否能打开，具有很好的参考价值，希望对大家有所帮助。如有错误或未考虑完全的地方，望不吝赐教
使用httpclient检测url状态及链接是否能打开
有时候我们需要检测某个url返回的状态码是不是200或者页面能不能正常打开响应可使用如下代码：
需要使用到的maven
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.5.5</version>
</dependency>
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpcore</artifactId>
<version>4.4.14</version>
</dependency>
<dependency>
<groupId>commons-logging</groupId>
<artifactId>commons-logging</artifactId>
<version>1.2</version>
</dependency>
代码：
public static String checkUrlConnection(String url) {
// 创建http POST请求
HttpGet httpGet = new HttpGet(url);
httpGet.setHeader("Content-Type", "application/json");
RequestConfig requestConfig = RequestConfig.custom().setConnectTimeout(600)// 设置连接主机服务超时时间
.setConnectionRequestTimeout(1000)// 设置连接请求超时时间
.setSocketTimeout(1000)// 设置读取数据连接超时时间
.build();
// 为httpPost实例设置配置
httpGet.setConfig(requestConfig);
// 设置请求头
CloseableHttpClient httpclient = null;
CloseableHttpResponse response = null;
int statusCode = 404;
try {
httpclient = HttpClients.createDefault();// 创建Httpclient对象
response = httpclient.execute(httpGet);// 执行请求
statusCode = response.getStatusLine().getStatusCode();
}catch (SocketException e) {
return "404";
} catch (IOException e) {
System.out.println("报错");
return "404";
}
return String.valueOf(statusCode);
}
HTTPClient调用远程URL实例
案例描述
一次项目中后端服务需要从微信小程序获取扫码关注次数，网上搜各种示例都不太好用（代码冗余且效果不佳），于是自己花功夫做了一套。
public interface CustomerAppointAPIService {
String getApiToken(JSONObject json);
JSONObject getFollowNum(JSONObject SaleId);
void updateFacoriteCountRealitys();
}
package com.faw.xxx.modules.staff.service.impl;
import java.util.List;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.util.EntityUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.faw.xxx.modules.staff.dao.DsCepStaffDAO;
import com.faw.xxx.modules.staff.entity.DsCepStaff;
import com.faw.xxx.modules.staff.service.CustomerAppointAPIService;
import com.faw.xxx.utils.SSLClient;
import cn.hutool.core.codec.Base64;
@Service
public class CustomerAppointAPIServiceImpl implements CustomerAppointAPIService {
@Autowired
private DsCepStaffDAO dsCepStaffDAO;
/**
* 授权接口
* 参数格式：
*{
* "Client":"digital_xxx",//客户端标识
* "Secret":"@-!xxx"//客户端接入秘钥
*}
*/
@Override
public String getApiToken(JSONObject json) {
HttpClient httpClient = null;
HttpPost httpPost = null;
String body = null;
String postData = JSON.toJSONString(json);
String encryptData=Base64.encode(postData);
JSONObject params = new JSONObject();
params.put("request", encryptData);
String url = "https://miniappxxx.xxx.com.cn/api/v1/APIToken/GetApiToken";
try{
httpClient = new SSLClient();
httpPost = new HttpPost(url);
httpPost.addHeader("Content-type", "application/json; charset=utf-8");
// httpPost.addHeader("Authorization", head);
httpPost.setHeader("Accept", "application/json");
httpPost.setEntity(new StringEntity(params.toJSONString(), "UTF-8"));
HttpResponse response = httpClient.execute(httpPost);
if(response != null){
HttpEntity resEntity = response.getEntity();
if(resEntity != null){
body = EntityUtils.toString(resEntity,"utf-8");
}
}
}catch(Exception ex){
ex.printStackTrace();
}
JSONObject result = JSON.parseObject(body);
JSONObject msgData = result.getJSONObject("msg");
//接口直接返回token，以便于下一个接口调用
return msgData.get("Token").toString();
}
/**
* 微信小程序关注次数接口,POST请求
*/
@Override
public JSONObject getFollowNum(JSONObject SaleId) {
HttpClient httpClient = null;
HttpPost httpPost = null;
String body = null;
String postData = JSON.toJSONString(SaleId);
String encryptData = Base64.encode(postData);
JSONObject params = new JSONObject();
params.put("request", encryptData);
String json = "{\"Client\":\"digital_xxx\",\"Secret\":\"@-!6xxx\"}";
String token = this.getApiToken(JSON.parseObject(json));
String url = "https://miniappxxx.xxx.com.cn/api/v2/WechatApi/xxxNum";
try{
httpClient = new SSLClient();
httpPost = new HttpPost(url);
httpPost.addHeader("Content-type", "application/json; charset=utf-8");
httpPost.addHeader("Authorization", "bearer " + token);
httpPost.setHeader("Accept", "application/json");
httpPost.setEntity(new StringEntity(params.toJSONString(), "UTF-8"));
HttpResponse response = httpClient.execute(httpPost);
if(response != null){
HttpEntity resEntity = response.getEntity();
if(resEntity != null){
body = EntityUtils.toString(resEntity,"utf-8");
}
}
}catch(Exception ex){
ex.printStackTrace();
}
JSONObject result = JSON.parseObject(body);
JSONObject resultData = new JSONObject();
resultData.put("code", result.get("code"));
resultData.put("data", result.get("data"));
return resultData;
}
//更新所有在职销售顾问实际被关注数，此接口涉及内部代码，不做详解
@Override
@Transactional
public void updateFacoriteCountRealitys() {
//获取所有在职员工列表
List<DsCepStaff> dsCepStaffs = dsCepStaffDAO.getAllOnPost();
if (dsCepStaffs.size()>0) {
for (DsCepStaff dsCepStaff : dsCepStaffs) {
//更新销售顾问实际被关注数
JSONObject SaleId = new JSONObject();
SaleId.put("SaleId", dsCepStaff.getStaffId());
JSONObject resultData = this.getFollowNum(SaleId);
if (resultData != null) {
Integer facoriteCountReality = Integer.parseInt(resultData.get("data").toString());
dsCepStaffDAO.updateFacoriteCountRealityByStaffId(facoriteCountReality, dsCepStaff.getStaffId());
}
}
}
}
}
package com.faw.xxx.utils;
import org.apache.http.conn.ClientConnectionManager;
import org.apache.http.conn.scheme.Scheme;
import org.apache.http.conn.scheme.SchemeRegistry;
import org.apache.http.conn.ssl.SSLSocketFactory;
import org.apache.http.impl.client.DefaultHttpClient;
import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
/**
* 用于进行Https请求的HttpClient
* @author user
*
*/
public class SSLClient extends DefaultHttpClient {
public SSLClient() throws Exception{
super();
SSLContext ctx = SSLContext.getInstance("TLS");
X509TrustManager tm = new X509TrustManager() {
@Override
public void checkClientTrusted(X509Certificate[] chain,
String authType) throws CertificateException {
}
@Override
public void checkServerTrusted(X509Certificate[] chain,
String authType) throws CertificateException {
}
@Override
public X509Certificate[] getAcceptedIssuers() {
return null;
}
};
ctx.init(null, new TrustManager[]{tm}, null);
SSLSocketFactory ssf = new SSLSocketFactory(ctx,SSLSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER);
ClientConnectionManager ccm = this.getConnectionManager();
SchemeRegistry sr = ccm.getSchemeRegistry();
sr.register(new Scheme("https", 443, ssf));
}
}
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。