JAVA利用HttpClient进行POST和GET请求（HTTPS）-阿里云开发者社区

JAVA利用HttpClient进行POST和GET请求（HTTPS）

2018-02-04 5733

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简介： JAVA利用HttpClient进行POST和GET请求（HTTPS），原文地址http://www.bieryun.com/902.html 目前，要为另一个项目提供接口，接口是用HTTP URL实现的，最初的想法是另一个项目用JQuery post进行请求。

JAVA利用HttpClient进行POST和GET请求（HTTPS），原文地址http://www.bieryun.com/902.html

目前，要为另一个项目提供接口，接口是用HTTP URL实现的，最初的想法是另一个项目用JQuery post进行请求。

但是，很可能另一个项目是部署在别的机器上，那么就存在跨域问题，而JQuery的post请求是不允许跨域的。

这时，就只能够用HttpClient包进行请求了，同时由于请求的URL是HTTPS的，为了避免需要证书，所以用一个类继承DefaultHttpClient类，忽略校验过程。

1.写一个SSLClient类，继承至HttpClient

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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));
}
}

2.写一个利用HttpClient发送post请求的类

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import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
/*
* 利用HttpClient进行post请求的工具类
*/
public class HttpClientUtil {
public String doPost(String url,Map<String,String> map,String charset){
HttpClient httpClient = null;
HttpPost httpPost = null;
String result = null;
try{
httpClient = new SSLClient();
httpPost = new HttpPost(url);
//设置参数
List<NameValuePair> list = new ArrayList<NameValuePair>();
Iterator iterator = map.entrySet().iterator();
while(iterator.hasNext()){
Entry<String,String> elem = (Entry<String, String>) iterator.next();
list.add(new BasicNameValuePair(elem.getKey(),elem.getValue()));
}
if(list.size() > 0){
UrlEncodedFormEntity entity = new UrlEncodedFormEntity(list,charset);
httpPost.setEntity(entity);
}
HttpResponse response = httpClient.execute(httpPost);
if(response != null){
HttpEntity resEntity = response.getEntity();
if(resEntity != null){
result = EntityUtils.toString(resEntity,charset);
}
}
}catch(Exception ex){
ex.printStackTrace();
}
return result;
}
}

3.调用post请求的测试代码

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import java.util.HashMap;
import java.util.Map;
//对接口进行测试
public class TestMain {
private String url = "https://192.168.1.101/";
private String charset = "utf-8";
private HttpClientUtil httpClientUtil = null;
public TestMain(){
httpClientUtil = new HttpClientUtil();
}
public void test(){
String httpOrgCreateTest = url + "httpOrg/create";
Map<String,String> createMap = new HashMap<String,String>();
createMap.put("authuser","*****");
createMap.put("authpass","*****");
createMap.put("orgkey","****");
createMap.put("orgname","****");
String httpOrgCreateTestRtn = httpClientUtil.doPost(httpOrgCreateTest,createMap,charset);
System.out.println("result:"+httpOrgCreateTestRtn);
}
public static void main(String[] args){
TestMain main = new TestMain();
main.test();
}
}

4.GET的请求方式

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/**
* 发送get请求
* @param url 链接地址
* @param charset 字符编码，若为null则默认utf-8
* @return
*/
public String doGet(String url,String charset){
if(null == charset){
charset = "utf-8";
}
HttpClient httpClient = null;
HttpGet httpGet= null;
String result = null;
try {
httpClient = new SSLClient();
httpGet = new HttpGet(url);
HttpResponse response = httpClient.execute(httpGet);
if(response != null){
HttpEntity resEntity = response.getEntity();
if(resEntity != null){
result = EntityUtils.toString(resEntity,charset);
}
}
} catch (Exception e) {
e.printStackTrace();
}
return result;
}

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