基于SOAP协议的WEB服务调用方式：

import org.apache.commons.lang.StringEscapeUtils;

import org.apache.log4j.Logger;

/**
     * webservice请求
     * @param xmlStr
     * @return
     * @throws Exception
     */
    public static String callXml(String xmlStr, String soapAddress) throws IOException {
        //地址
        URL url = new URL(soapAddress);
        //调用的方法
        String soapActionString = "";
        logger.info("请求SOAP地址："+soapAddress);
        logger.info("请求SOAPAction："+soapActionString);
        //打开链接
        HttpURLConnection con = (HttpURLConnection) url.openConnection();
        logger.info("请求报文："+xmlStr);
        //设置好header信息
        con.setRequestMethod("POST");
        con.setRequestProperty("Content-Type", "text/xml;charset=UTF-8");
        con.setRequestProperty("Content-Length", String.valueOf(xmlStr.getBytes().length));
        con.setRequestProperty("SOAPAction", soapActionString);
        //post请求需要设置
        con.setDoOutput(true);
        con.setDoInput(true);
        //对请求body 往里写xml 设置请求参数.
        PrintWriter out = null;
        byte[] responseData = null;
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        try {
            out = new PrintWriter(new OutputStreamWriter(con.getOutputStream(),"utf-8"));
            // 发送请求参数
            out.print(xmlStr);
            out.flush();
            //设置响应回来的信息
            InputStream ips = con.getInputStream();
            byte[] buf = new byte[1024];
            int length = 0;
            while( (length = ips.read(buf)) != -1){
                baos.write(buf, 0, length);
                baos.flush();
            }
            responseData = baos.toByteArray();
        } catch (IOException e) {
            throw new IOException(e);
        } finally {
            if (out != null) {
                out.close();
            }
            try {
                baos.close();
            } catch (IOException e) {
                throw new IOException(e);
            }
            con.disconnect();
        }
        //处理写响应信息
        String responseMess = new String(responseData,"utf-8");
        responseMess = StringEscapeUtils.unescapeHtml(responseMess);
        logger.info("响应码："+con.getResponseCode());
        logger.info("响应报文："+responseMess);
        return responseMess;
    }