WebService的实现方式之一就是基于HTTP发送SOAP报文进行调用。
可能由于各种原因，我们不能使用CXF、AXIS等框架调用，此时的解决方案之一就是直接基于HTTP发送SOAP报文，然后将响应报文当作XML进行处理。
废话不多，直接上代码：
需要导入类：
1 import org.apache.commons.httpclient.HttpClient;
2 import org.apache.commons.httpclient.UsernamePasswordCredentials;
3 import org.apache.commons.httpclient.auth.AuthScope;
4 import org.apache.commons.httpclient.methods.PostMethod;
5 import org.apache.commons.httpclient.methods.RequestEntity;
6 import org.apache.commons.httpclient.methods.StringRequestEntity;
7 import org.apache.commons.httpclient.params.HttpClientParams;
核心代码：
private String invokeService(String operationName, BaseRequestModel requestModel) throws Exception {
String url = endpointUrl;
String userName = "beiifeng";
String password = "beiifeng";
int timeOut = 60;
String targetNameSpace = "http://service.ws.beiifeng.com";
// 创建Http客户端
HttpClient httpclient = new HttpClient();
// 权限用户验证
httpclient.getState().setCredentials(AuthScope.ANY, new UsernamePasswordCredentials(userName, password));
PostMethod post = null;
try {
post = new PostMethod(url);
HttpClientParams params = new HttpClientParams();
params.setSoTimeout(timeOut * 1000);
httpclient.setParams(params);
RequestEntity entity = new StringRequestEntity(this.formatSOAPRequest(operationName, targetNameSpace, requestModel), "text/xml", "UTF-8");
post.setRequestEntity(entity);
int result = httpclient.executeMethod(post);
//异常
String res = post.getResponseBodyAsString();
if (result != 200) {
throw new RuntimeException("调用webservice失败：服务器端返回HTTP code " + result + "\n信息：" + res);
}
return res;
} catch (Exception e) {
throw e;
} finally {
if (post != null) {
post.releaseConnection();
}
}
}
private String formatSOAPRequest(String operationName, String targetNameSpace, BaseRequestModel requestModel) {
StringBuffer sb = new StringBuffer();
sb.append("<SOAP-ENV:Envelope xmlns:SOAP-ENC=\"http://schemas.xmlsoap.org/soap/encoding/\" " +
"xmlns:SOAP-ENV=\"http://schemas.xmlsoap.org/soap/envelope/\" xmlns:xsd=\"http://" +
"www.w3.org/2001/XMLSchema\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instanc" +
"e\">\n");
sb.append("<SOAP-ENV:Body>\n");
sb.append("<m:" + operationName + " xmlns:m=\"" + targetNameSpace + "\">\n");
sb.append(requestModel.requestModelToString());
sb.append("</m:" + operationName + ">\n");
sb.append("</SOAP-ENV:Body>\n");
sb.append("</SOAP-ENV:Envelope>\n");
return sb.toString();
}
请求实体类继承自BaseRequestModel，代码如下：
public abstract class BaseRequestModel {
/**
* 将请求实体转换为类似XML字符串
*
* @return soapAction中的XML格式字符串
*/
public abstract String requestModelToString();
}
总结：其中滋味，各位看客自行体会:p
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