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

[java] view plain
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
[java] view plain
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
[java] view plain
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

[java] view plain copy 在CODE上查看代码片派生到我的代码片
/**
     * 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; 
    } 



需要：httpcore-4.3.3.jar，
httpcore-4.0.1.jar 不支持SSLClient()
httpClient4.2的jar包下载路径：http://download.csdn.net/detail/hqmryang/4582440#comment