HTTP接口客户端开发

工作中为第三方厂商提供HTTP接口，第三方传送请求报文给我们，我们自己进行相应的业务处理之后返回给第三方相应报文。

自己编写完服务端之后，还需要写个客户端进行模拟测试，以下用POST方式向HTTP接口发送数据。

编写客户端需要用到以下两个包，专门用于java客户端的开发：

传递相应的参数，通过POST方式调用HTTP接口：

<span style="font-family:Microsoft YaHei;"><span style="white-space:pre"></span><span style="font-size:14px;">public static void main(String[] args) throws Exception {</span></span><pre><span style="font-family:Microsoft YaHei;"><span style="font-size:14px;">TestHttpPost test = new TestHttpPost();</span></span><span style="font-family:Microsoft YaHei;"><span style="font-size:14px;">String xmlFilePath1 = "C:\\Users\\test.xml";</span></span><span style="font-family:Microsoft YaHei;"><span style="font-size:14px;">String url = "http://localhost:8001/servlet";</span></span><span style="font-family:Microsoft YaHei;"><span style="font-size:14px;">test.postHttpRequest(xmlFilePath1,url);</span></span><span style="font-family:Microsoft YaHei;"><span style="font-size:14px;">}</span></span>

<span style="font-family:Microsoft YaHei;">/**<span style="font-size:14px;"> * 发送POST请求 * @param xmlFilePath 请求文件路径 * @param url  接口访问地址 * @throws Exception */public void postHttpRequest(String xmlFilePath,String url) throws Exception{SAXReader saxReader = new SAXReader();Document document = saxReader.read(new FileInputStream(new File(xmlFilePath)));String requestXml = document.asXML();        HttpPost httpPost = null;        try {            // 定义HttpPost请求            httpPost = new HttpPost(url);            // 定义请求实体            HttpEntity requestEntity = new StringEntity(requestXml, "UTF-8");            httpPost.setEntity(requestEntity);            // 定义HttpClient           HttpClient httpClient = new DefaultHttpClient();                        HttpParams httpParams = httpClient.getParams();            // 设置Http协议的版本            httpParams.setParameter(CoreProtocolPNames.PROTOCOL_VERSION, HttpVersion.HTTP_1_1);            // 设置请求连接超时时间            httpParams.setParameter(CoreConnectionPNames.CONNECTION_TIMEOUT, 1000);            // 设置请求响应超时时间            httpParams.setParameter(CoreConnectionPNames.SO_TIMEOUT, 50000);            // 以post方式发送Http请求            HttpResponse httpResponse = httpClient.execute(httpPost);            // 获取响应实体            HttpEntity responsetEntity = httpResponse.getEntity();            InputStream inputStream = responsetEntity.getContent();            StringBuilder reponseXml = new StringBuilder();            byte[] b = new byte[2048];            int length = 0;            while ((length = inputStream.read(b)) != -1) {                reponseXml.append(new String(b, 0, length));            }            //将返回的报文打印出来            System.out.println(URLDecoder.decode(reponseXml.toString(), "UTF-8") );        } catch (Exception e) {            if(SocketTimeoutException.class.isInstance(e)){                throw new RuntimeException("Http请求响应超时",e);            }            else if(ConnectException.class.isInstance(e)){                throw new RuntimeException("Http请求异常", e);            }else{                throw new RuntimeException("其他异常", e);            }        } finally{      //释放请求的连接            if(httpPost!=null){                httpPost.abort();            }        }    }</span></span>