package com.huawei.esdk.fusioncompute.demo.servlet;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.log4j.Logger;import com.google.gson.Gson;import com.huawei.esdk.fusioncompute.demo.factory.ServiceManageFactory;import com.huawei.esdk.fusioncompute.demo.utils.ParametersUtils;import com.huawei.esdk.fusioncompute.local.model.FCSDKResponse;import com.huawei.esdk.fusioncompute.local.model.common.LoginResp;import com.huawei.esdk.fusioncompute.local.model.vm.QueryOsVersionsResp;/** * “查询VDC”请求处理类 * @author dWX213051 * @see * @since eSDK Cloud V100R003C30 */public class QueryOsVersionsServlet extends HttpServlet{    /**     * 序列化版本标识     */    private static final long serialVersionUID = 190954570327110271L;    /**     * log日志对象     */    private static final Logger LOGGER = Logger            .getLogger(QueryOsVersionsServlet.class);    /**     * gson，用于转换String和json之间的转换     */    private Gson gson = new Gson();    @Override    protected void doPost(        HttpServletRequest request, HttpServletResponse response)        throws ServletException, IOException    {        doGet(request, response);    }    @Override    protected void doGet(        HttpServletRequest request, HttpServletResponse response)        throws ServletException, IOException    {        // 设置request的编码        request.setCharacterEncoding("UTF-8");                // 获取需要调用的方法名        String methodName = request.getParameter("method");        String resp = "";        if ("queryOsVersions".equals(methodName))        {            // 查询VDC            resp = queryOsVersions(request);        }        // 设置response的编码        response.setContentType("application/json;charset=UTF-8");        // 输出流        PrintWriter pw = response.getWriter();        // 将结果放到浏览器中        // BUG: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')// pw.print(resp);// FIXED:         // 关闭输出流        pw.close();    }    /**     * 查VDC信息     *      * @param request     *            HttpServletRequest对象     * @return json格式的字符串     * @see     * @since eSDK Cloud V100R003C50     */    public String queryOsVersions(HttpServletRequest request)    {        // 定义返回结果        String response = null;        // 获取用户名        String userName = ParametersUtils.userName;        // 获取密码        String password = ParametersUtils.password;                // 调用鉴权接口        FCSDKResponse<LoginResp> loginResp = ServiceManageFactory.getUserService().login(userName, password);                if (!"00000000".equals(loginResp.getErrorCode()))        {        	// 鉴权失败        	LOGGER.error("Failed to Login FC System!");        	return gson.toJson(loginResp);        }                LOGGER.info("Login Success!");        LOGGER.info("Begin to query OsVersions information.");                // 获取站点Uri        String siteUri = request.getParameter("siteUri");                // 调用“查询指定站点支持创建虚拟机操作系统的版本”接口        FCSDKResponse<QueryOsVersionsResp> resp = ServiceManageFactory.getVmResource().queryOsVersions(siteUri);                        // 根据接口返回数据生成JSON字符串，以便于页面展示        response = gson.toJson(resp);                LOGGER.info("Finish to query OsVersions, response is : " + response);        return response;    }}