JAVA利用HttpClient进行POST和GET请求（HTTPS）

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

 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

 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

 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

/**
	 * 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;
	}

httpClient4.2的jar包下载路径：http://download.csdn.net/detail/hqmryang/4582440#comment