1、引入相关依赖包
jar包下载：httpcore4.5.5.jar fastjson-1.2.47.jar
maven：
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.5.5</version>
</dependency> <dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.47</version>
</dependency>
2、主要类HttpClientService
package com.sinotn.service; import com.alibaba.fastjson.JSONObject;
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.client.utils.URIBuilder;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicHeader;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.ArrayList;
import java.util.List; /**
* HttpClient发送GET、POST请求
* @Author libin
* @CreateDate 2018.5.28 16:56
*/
public class HttpClientService { private static final Logger LOGGER = LoggerFactory.getLogger(HttpClientService.class);
/**
* 返回成功状态码
*/
private static final int SUCCESS_CODE = 200; /**
* 发送GET请求
* @param url 请求url
* @param nameValuePairList 请求参数
* @return JSON或者字符串
* @throws Exception
*/
public static Object sendGet(String url, List<NameValuePair> nameValuePairList) throws Exception{
JSONObject jsonObject = null;
CloseableHttpClient client = null;
CloseableHttpResponse response = null;
try{
/**
* 创建HttpClient对象
*/
client = HttpClients.createDefault();
/**
* 创建URIBuilder
*/
URIBuilder uriBuilder = new URIBuilder(url);
/**
* 设置参数
*/
uriBuilder.addParameters(nameValuePairList);
/**
* 创建HttpGet
*/
HttpGet httpGet = new HttpGet(uriBuilder.build());
/**
* 设置请求头部编码
*/
httpGet.setHeader(new BasicHeader("Content-Type", "application/x-www-form-urlencoded; charset=utf-8"));
/**
* 设置返回编码
*/
httpGet.setHeader(new BasicHeader("Accept", "text/plain;charset=utf-8"));
/**
* 请求服务
*/
response = client.execute(httpGet);
/**
* 获取响应吗
*/
int statusCode = response.getStatusLine().getStatusCode(); if (SUCCESS_CODE == statusCode){
/**
* 获取返回对象
*/
HttpEntity entity = response.getEntity();
/**
* 通过EntityUitls获取返回内容
*/
String result = EntityUtils.toString(entity,"UTF-8");
/**
* 转换成json,根据合法性返回json或者字符串
*/
try{
jsonObject = JSONObject.parseObject(result);
return jsonObject;
}catch (Exception e){
return result;
}
}else{
LOGGER.error("HttpClientService-line: {}, errorMsg{}", 97, "GET请求失败！");
}
}catch (Exception e){
LOGGER.error("HttpClientService-line: {}, Exception: {}", 100, e);
} finally {
response.close();
client.close();
}
return null;
} /**
* 发送POST请求
* @param url
* @param nameValuePairList
* @return JSON或者字符串
* @throws Exception
*/
public static Object sendPost(String url, List<NameValuePair> nameValuePairList) throws Exception{
JSONObject jsonObject = null;
CloseableHttpClient client = null;
CloseableHttpResponse response = null;
try{
/**
* 创建一个httpclient对象
*/
client = HttpClients.createDefault();
/**
* 创建一个post对象
*/
HttpPost post = new HttpPost(url);
/**
* 包装成一个Entity对象
*/
StringEntity entity = new UrlEncodedFormEntity(nameValuePairList, "UTF-8");
/**
* 设置请求的内容
*/
post.setEntity(entity);
/**
* 设置请求的报文头部的编码
*/
post.setHeader(new BasicHeader("Content-Type", "application/x-www-form-urlencoded; charset=utf-8"));
/**
* 设置请求的报文头部的编码
*/
post.setHeader(new BasicHeader("Accept", "text/plain;charset=utf-8"));
/**
* 执行post请求
*/
response = client.execute(post);
/**
* 获取响应码
*/
int statusCode = response.getStatusLine().getStatusCode();
if (SUCCESS_CODE == statusCode){
/**
* 通过EntityUitls获取返回内容
*/
String result = EntityUtils.toString(response.getEntity(),"UTF-8");
/**
* 转换成json,根据合法性返回json或者字符串
*/
try{
jsonObject = JSONObject.parseObject(result);
return jsonObject;
}catch (Exception e){
return result;
}
}else{
LOGGER.error("HttpClientService-line: {}, errorMsg：{}", 146, "POST请求失败！");
}
}catch (Exception e){
LOGGER.error("HttpClientService-line: {}, Exception：{}", 149, e);
}finally {
response.close();
client.close();
}
return null;
} /**
* 组织请求参数{参数名和参数值下标保持一致}
* @param params 参数名数组
* @param values 参数值数组
* @return 参数对象
*/
public static List<NameValuePair> getParams(Object[] params, Object[] values){
/**
* 校验参数合法性
*/
boolean flag = params.length>0 && values.length>0 && params.length == values.length;
if (flag){
List<NameValuePair> nameValuePairList = new ArrayList<>();
for(int i =0; i<params.length; i++){
nameValuePairList.add(new BasicNameValuePair(params[i].toString(),values[i].toString()));
}
return nameValuePairList;
}else{
LOGGER.error("HttpClientService-line: {}, errorMsg：{}", 197, "请求参数为空且参数长度不一致");
}
return null;
}
}
3、调用方法
package com.sinotn.service.impl; import com.sinotn.service.HttpClientService;
import org.apache.http.NameValuePair; import java.util.List; /**
* 发送post/get 测试类
*/
public class Test { public static void main(String[] args) throws Exception{
String url = "要请求的url地址";
/**
* 参数值
*/
Object [] params = new Object[]{"param1","param2"};
/**
* 参数名
*/
Object [] values = new Object[]{"value1","value2"};
/**
* 获取参数对象
*/
List<NameValuePair> paramsList = HttpClientService.getParams(params, values);
/**
* 发送get
*/
Object result = HttpClientService.sendGet(url, paramsList);
/**
* 发送post
*/
Object result2 = HttpClientService.sendPost(url, paramsList); System.out.println("GET返回信息：" + result);
System.out.println("POST返回信息：" + result2);
}
}
4、对于发送https
为了避免需要证书，所以用一个类继承DefaultHttpClient类，忽略校验过程。
写一个SSLClient类，继承至HttpClient
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;
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;
//用于进行Https请求的HttpClient
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));
}
}