java - 如何使用 JAX-WS 从 Web 服务访问 DAO

Question

刚刚开始使用 JAX-WS。我创建了服务类和 DAO 类。我的服务运行良好，但它给出了 NullPointerExeption，因为它无法定位到 DAO；我正在尝试从服务类调用 DAO:

package com.nmmc.works.service.impl;
@WebService(serviceName="MyService")
public class SecurityServiceImpl extends GenericServiceImpl implements ISecurityService
{   
    private ISecurityDAO securityDAO;

....getter setter methods....

@WebMethod
    public Integer getBidAcceptanceIdForSDPayment(Integer tMastNo)
    {   
        InternalResultsResponse<Object> response = getSecurityDAO().getMyMethod(tenderMastNo);
        if(response != null && response.getResultsList().size() > 0){
            return Integer.parseInt(response.getFirstResult().toString());  
        }else{
            return -1;
        }

    }

还有 sun-jaxws.xml......

<b>
<?xml version="1.0" encoding="UTF-8"?>
    <endpoints version="2.0" xmlns="http://java.sun.com/xml/ns/jax-ws/ri/runtime">
      <endpoint 
          implementation="com.nmmc.works.service.impl.SecurityDepositServiceImpl"

          name="MyServices" 
          url-pattern="myPath/SecurityServiceImpl"
          />
    </endpoints></b>

在 web.xml 中......

<b><listener>
      <listener-class>com.sun.xml.ws.transport.http.servlet.WSServletContextListener</listener-class>
    </listener>

    <servlet>
        <servlet-name>WebServices</servlet-name>
        <servlet-class>com.sun.xml.ws.transport.http.servlet.WSServlet</servlet-class>
        <load-on-startup>2</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>WebServices</servlet-name>
        <url-pattern>/ws/*</url-pattern>
    </servlet-mapping></b>

Answer 1

当您运行 SecurityServiceImpl 时，其中没有 DAO。您必须确保正确创建 DAO 并将其注入(inject)/获取。