Java实现转发基于soap协议的webservice接口调用

由 匿名 (未验证) 提交于 2019-12-02 21:53:52
现在有这么一个需求，我们的系统(M)作为各个系统信息交换中间平台。系统Ａ和系统Ｂ需要交互，但是他们的网络是隔离的。系统Ｂ通过webservice发布了一些接口服务，然后提供WSDL给系统Ａ调用，然而系统A是无法访问系统B的网络，所以数据先要发送中间系统M。其实也就是一个简单的服务转发代理的功能，只是涉及到soap协议的交互。
这里给出一种简单的方式：
系统Ａ使用soapui导入WSDL文件，获取每个方法的请求报文->提交M->原样提交到系统B－>将系统B的处理结果返回
其中主要涉及到soap协议的一些报文头的设置，下边会有调用代码说明。
１，转发的实现
主要是在中间系统Ｍ注册filter来拦截webservice请求，然后将请求数据流构造一个新的http请求发送给系统B。这里请求的发送和转换
采用httpcomponents实现。引入依赖：
　　　　　<dependency>             <groupId>org.apache.httpcomponents</groupId>             <artifactId>httpclient</artifactId>             <version>4.4</version>         </dependency>         <dependency>             <groupId>org.apache.httpcomponents</groupId>             <artifactId>httpcore</artifactId>             <version>4.4</version>         </dependency> 　　　　　<dependency>             <groupId>org.apache.httpcomponents</groupId>             <artifactId>httpclient</artifactId>             <version>4.4</version>         </dependency>         <dependency>             <groupId>org.apache.httpcomponents</groupId>             <artifactId>httpcore</artifactId>             <version>4.4</version>         </dependency>
filter代码如下：
package cn.com.egova.easyshare.web.filter;   /**  * @auth gongxufan  * @Date 2017/9/20  **/   import org.apache.cxf.helpers.IOUtils; import org.apache.http.Header; import org.apache.http.client.methods.CloseableHttpResponse; import org.apache.http.client.methods.HttpPost; import org.apache.http.entity.InputStreamEntity; import org.apache.http.impl.client.CloseableHttpClient; import org.apache.http.impl.client.HttpClients;   import javax.servlet.Filter; import javax.servlet.FilterChain; import javax.servlet.FilterConfig; import javax.servlet.ServletException; import javax.servlet.ServletRequest; import javax.servlet.ServletResponse; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; import java.util.Enumeration; import java.util.ResourceBundle;   /**  * WSDL服务器请求转发  */ public class WebServiceDispatchFilter implements Filter {     private static String WEBSERVICE_URL;     private static String WEBSERVICE_HOST;       static {         ResourceBundle bundler = ResourceBundle.getBundle("config");         // 获取调用接口的路径         WEBSERVICE_URL = bundler.getString("WEBSERVICE_URL");         WEBSERVICE_HOST = bundler.getString("WEBSERVICE_HOST");     }       @Override     public void doFilter(ServletRequest req, ServletResponse resp,                          FilterChain chain) throws IOException, ServletException {         HttpServletRequest request = (HttpServletRequest) req;         HttpServletResponse response = (HttpServletResponse) resp;         try {             CloseableHttpClient httpClient = HttpClients.createDefault();             HttpPost httpPost = new HttpPost(WEBSERVICE_URL);             //构造新的请求数据流             InputStreamEntity entity = new InputStreamEntity(                     request.getInputStream());             httpPost.setEntity(entity);             //复制请求参数             for (Enumeration<String> e = request.getHeaderNames(); e                     .hasMoreElements(); ) {                 String name = e.nextElement().toString();                 //注意这里不要设置，发送请求会抛异常                 if ("Content-Length".equalsIgnoreCase(name)) {                     continue;                 }                 httpPost.setHeader(name, request.getHeader(name));             }             //host参数需要覆盖，设置为webservice服务提供这的主机             httpPost.setHeader("host", WEBSERVICE_HOST);               //提交soap请求             CloseableHttpResponse httpResponse = httpClient.execute(httpPost);             //复制soap相应的消息头             for (Header h : httpResponse.getAllHeaders()) {                 response.setHeader(h.getName(), h.getValue());             }             //讲soap的返回流复制到filter的输出流             IOUtils.copyAndCloseInput(httpResponse.getEntity().getContent(),                     response.getOutputStream());         } catch (Exception e) {             response.setContentType("text/xml;charset=UTF-8");             String result = "<soap:Envelope xmlns:soap=\"http://schemas.xmlsoap.org/soap/envelope/\">"                     + "<soap:Body><soap:Fault><faultcode>"                     + "9999"                     + "</faultcode>"                     + "<faultstring>"                     + "失败:"                     + e.getMessage()                     + "</faultstring></soap:Fault></soap:Body></soap:Envelope>";             response.getWriter().print(result);         }     }       @Override     public void init(FilterConfig filterConfig) throws ServletException {     }       @Override     public void destroy() {     } }
代码实现也很简单：
CloseableHttpClient httpClient = HttpClients.createDefault();
HttpPost httpPost = new HttpPost(WEBSERVICE_URL);
这里构造了一个新的httpPost对象，然后读取请求流构造InputStreamEntity，接着设置httpPost的header这段。
执行CloseableHttpResponse httpResponse = httpClient.execute(httpPost);这样就获取了接口调用的结果

最后将httpResponse原样输出到系统A的调用者。

为了测试方便，我们使用天气预报的webservice接口进行测试，上面代码的主机和服务地址是写在配置文件的，其内容如下：

WEBSERVICE_HOST=www.webxml.com.cn
WEBSERVICE_URL=http://www.webxml.com.cn/WebServices/WeatherWebService.asmx?wsdl

配置filter拦截

    <filter>         <filter-name>WsTransFilter</filter-name>         <filter-class>cn.com.egova.easyshare.web.filter.WebServiceDispatchFilter</filter-class>     </filter>     <filter-mapping>         <filter-name>WsTransFilter</filter-name>         <url-pattern>/webservice/*</url-pattern>     </filter-mapping>
2,使用soapUI进行接口测试

用浏览器访问http://www.webxml.com.cn/WebServices/WeatherWebService.asmx?wsdl，并保存为WeatherWebService.xml。文件内容较多

这里就不展示了。打开soapUI，新建一个soap工程，并导入wsdl文件，这样就可以测试接口了。我们测试下getSupportCity这个方法。
最后测试转发服务只要把地址栏的地址替换成filter的访问地址即可:http://localhost:8080/easyshare-web/

3,使用HttpClient进行接口调用
只要按照soapUI测试接口的头部信息发送请求报文，就可以成功调用接口。因此我们的客户端调用代码按照这个模式就可以执行接口的调用了。只是要注意我们调用的目标是转发服务的地址。
package cn.com.egova.easyshare.test.web;  import cn.com.egova.easyshare.web.utils.HttpUtils;  import java.util.ResourceBundle;  /**  * @auth gongxufan  * @Date 2017/9/27  **/ public class SoapInvokeTest {     public static void main(String[] arg) {         //soap测试         String postUrl = "http://localhost:8080/easyshare-web/webservice";         //采用SOAP1.1调用服务端，这种方式能调用服务端为soap1.1和soap1.2的服务         String orderSoapXml = "<soapenv:Envelope xmlns:soapenv=\"http://schemas.xmlsoap.org/soap/envelope/\" xmlns:web=\"http://WebXml.com.cn/\">\n" +                 "   <soapenv:Header/>\n" +                 "   <soapenv:Body>\n" +                 "      <web:getSupportCity>\n" +                 "         <!--Optional:-->\n" +                 "         <web:byProvinceName>云南</web:byProvinceName>\n" +                 "      </web:getSupportCity>\n" +                 "   </soapenv:Body>\n" +                 "</soapenv:Envelope>";         String soap1_1 = HttpUtils.doPostSoap1_1(postUrl, orderSoapXml, "http://WebXml.com.cn/getSupportCity");         System.out.println(soap1_1);         //soap1.2没有soapAction头，直接设置在content-type         String soap1_2 = HttpUtils.doPostSoap1_2(postUrl, orderSoapXml, "http://WebXml.com.cn/getSupportCity");         System.out.println(soap1_2);         System.out.println("end");      } } 
 public static String doPostSoap1_1(String postUrl, String soapXml,                                        String soapAction) {         LOGGER.info("开始转发webservice：" + postUrl);         String retStr = "";         // 创建HttpClientBuilder         HttpClientBuilder httpClientBuilder = HttpClientBuilder.create();         // HttpClient         CloseableHttpClient closeableHttpClient = httpClientBuilder.build();         HttpPost httpPost = new HttpPost(postUrl);         //  设置请求和传输超时时间        /* RequestConfig requestConfig = RequestConfig.custom()                 .setSocketTimeout(socketTimeout)                 .setConnectTimeout(connectTimeout).build();         httpPost.setConfig(requestConfig);*/         try {             httpPost.setHeader("Content-Type", "text/xml;charset=UTF-8");             httpPost.setHeader("SOAPAction", soapAction);             StringEntity data = new StringEntity(soapXml,                     Charset.forName("UTF-8"));             httpPost.setEntity(data);             CloseableHttpResponse response = closeableHttpClient                     .execute(httpPost);             HttpEntity httpEntity = response.getEntity();             if (httpEntity != null) {                 // 打印响应内容                 retStr = EntityUtils.toString(httpEntity, "UTF-8");                 LOGGER.info("response:" + retStr);             }          } catch (Exception e) {             LOGGER.error("exception in doPostSoap1_1", e);         } finally {             // 释放资源             try {                 closeableHttpClient.close();             } catch (IOException e) {                 e.printStackTrace();             }         }         return retStr;     }      public static String doPostSoap1_2(String postUrl, String soapXml,                                        String soapAction) {         String retStr = "";         // 创建HttpClientBuilder         HttpClientBuilder httpClientBuilder = HttpClientBuilder.create();         // HttpClient         CloseableHttpClient closeableHttpClient = httpClientBuilder.build();         HttpPost httpPost = new HttpPost(postUrl);       /*  // 设置请求和传输超时时间         RequestConfig requestConfig = RequestConfig.custom()                 .setSocketTimeout(socketTimeout)                 .setConnectTimeout(connectTimeout).build();         httpPost.setConfig(requestConfig);*/         try {             httpPost.setHeader("Content-Type",                     "text/xml;charset=UTF-8;action=\"" + soapAction + "\"");             StringEntity data = new StringEntity(soapXml,                     Charset.forName("UTF-8"));             httpPost.setEntity(data);             CloseableHttpResponse response = closeableHttpClient                     .execute(httpPost);             HttpEntity httpEntity = response.getEntity();             if (httpEntity != null) {                 // 打印响应内容                 retStr = EntityUtils.toString(httpEntity, "UTF-8");                 LOGGER.info("response:" + retStr);             }             // 释放资源             closeableHttpClient.close();         } catch (Exception e) {             LOGGER.error("exception in doPostSoap1_2", e);         }         return retStr;     }

上面1.1和1.2方法的区别就是头部设置的差异，这个是按照soapUI调用时自动生成的header来设置的。



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string
soap
webservice接口
soap协议
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