org.apache.commons.httpclient 訪問需要驗證的webservice的一些問題

1、httpclient驗證問題

  webservice需要驗證時，直接發送請求會返回 HTTP/1.1 401 Unauthorized 錯誤

 這時候需要設置：

        Credentials defaultcreds = new UsernamePasswordCredentials("username", "password");
        httpClient.getState().setCredentials(AuthScope.ANY, defaultcreds);

注意password爲明文

2、Unsupported xstream 錯誤

這個需要進行設置請求類型，一般請求如下設置，此爲post請求：

        byte[] b = soapRequestData.getBytes("UTF-8");
         InputStream is = new ByteArrayInputStream(b,0,b.length);
        RequestEntity re = new InputStreamRequestEntity(is,b.length,"application/xop+xml; charset=UTF-8; type=\"text/xml\"");
         postMethod.setRequestEntity(re);

3、Unbuffered entity enclosing request can not be repeated.問題

一般來說，webservice需要驗證時，在httpclient請求之前需要加上上面的設置，然後使用上面的訪問進行post訪問時會發生此錯誤

此時需要將設置改爲如下：

 StringRequestEntity requestEntity = new StringRequestEntity(soapRequestData,"application/xop+xml; charset=UTF-8; type=\"text/xml\"","UTF-8");
 postMethod.setRequestEntity(requestEntity);

因此使用httpclient訪問需要驗證的webservice時，具體代碼如下

public static void post() throws Exception {
		HttpClient httpClient = new HttpClient();
		//post請求內容
		String soapRequestData ="postbody";
		// 構造HttpClient的實例
		Credentials defaultcreds = new UsernamePasswordCredentials("username", "password");
        httpClient.getState().setCredentials(AuthScope.ANY, defaultcreds);
        //webservice服務請求路徑
		String url = "";
		PostMethod postMethod = new PostMethod(url);
		//使用系統提供的默認的恢復策略
		postMethod.getParams().setParameter(HttpMethodParams.RETRY_HANDLER,
				new DefaultHttpMethodRetryHandler());
         
         StringRequestEntity requestEntity = new StringRequestEntity(soapRequestData,"application/xop+xml; charset=UTF-8; type=\"text/xml\"","UTF-8");
         postMethod.setRequestEntity(requestEntity);
         
		// 執行postMethod
		int statusCode = httpClient.executeMethod(postMethod);
		// HttpClient對於要求接受後繼服務的請求，
		System.out.println("statusCode is "+statusCode);
		if (statusCode != HttpStatus.SC_OK) {
			System.err.println("Method failed: "
					+ postMethod.getStatusLine());
		}
		// 讀取內容
		byte[] responseBody = postMethod.getResponseBody();
		// 處理內容
		System.out.println(new String(responseBody,"utf-8"));
	}