HttpClient的使用

 

有時候咱們須要進行遠程調用，跨域，有不少可選方案，例如 jsonp ，RMI,   HttpClient.

我感受 HttpClient屬於一次寫好，之後只要直接用就能夠了，很方便，節約時間。

/*
 * 利用HttpClient進行post請求的工具類
 */
public class HttpClientUtil {
	
	public static 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);
			//設置參數
			List<NameValuePair> list = new ArrayList<NameValuePair>();
			Iterator<Entry<String, String>> 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;
	}
}

public class SSLClient  extends DefaultHttpClient{
	public SSLClient() throws Exception{
        super();
        SSLContext ctx = SSLContext.getInstance("TLS");
        X509TrustManager tm = new X509TrustManager() {
                public void checkClientTrusted(X509Certificate[] chain,
                        String authType) throws CertificateException {
                }
                public void checkServerTrusted(X509Certificate[] chain,
                        String authType) throws CertificateException {
                }
                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));
    }
}

 

調用：

/**
	 *方法用途：使用
	 *@param args
	 *2017年1月11日
	 */
	public static void main(String[] args) {
		String url="";
		Map<String,String> param=new HashMap<String,String>();
		String charset="utf-8";
		String result=doPost(url,param,charset);
		System.out.println(result);
	}

 

param 的 key 爲參數名稱， value 爲參數的值。對方能夠用過 request.getParameter("");獲得值。