Http方式发送Soap报文调用WebService

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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