如何使用spring Hibernate將DTO的值（實體類的對象）設置爲通用列表<實體類>

請幫助我解決使用DTO將值從DAO傳遞到服務層時遇到的問題。這是我的DAO課程。如何使用spring Hibernate將DTO的值（實體類的對象）設置爲通用列表<實體類>

@Repository 
public class ProductDaoImpl implements ProductDAO { 

    @Autowired 
    private SessionFactory sessionFactory; 

    @Autowired 
    private ProductDTO productDTO; 
    //ProductDTO productDTO=new ProductDTO(); 

     @SuppressWarnings("unchecked") 
     @Override 
     public ProductDTO getAllProduct(){ 
     //public List<Product_Catalog> getAllProduct(){ 
      //return this.sessionFactory.getCurrentSession().getNamedQuery("findAllProduct").list(); 


      Session session = sessionFactory.getCurrentSession(); 
       Query query=(Query) session.getNamedQuery("findAllProduct"); 
       // query.setInteger("productCatalogId", id); 
       List<Product_Catalog> product=query.list(); 

       for (Iterator iterator = product.iterator(); iterator.hasNext();) { 
        Product_Catalog products = (Product_Catalog) iterator.next(); 
        productDTO.setMaxPrice(products.getMaxPrice()); 
        productDTO.setMinPrice(products.getMinPrice()); 
        System.out.println("Max Price " + products.getMaxPrice()); 
        System.out.println("Max Price " + productDTO.getMaxPrice()); 

       } 

      return productDTO; 
} 
}

DTO類：

public class ProductDTO implements java.io.Serializable { 

     private int pincode; 
     private int productCatalogId ; 
     private Requirement_type requirementTypeId ; 
     private Boolean isActive ; 
     private Boolean isRequesterProduct ; 
     private float maxPrice ; 
     private float minPrice; 
//getter ,setter 
}

ServiceImpl類： -

@Service 
public class ProductServiceImpl implements ProductService { 

    @Autowired 
    private ProductDAO productDAO; 

    List<Product_Catalog> product=new ArrayList<Product_Catalog>(); 

    @SuppressWarnings("unchecked") 
    @Override 
    @Transactional 
    public List<Product_Catalog> getAllProduct(){ 

     ProductDTO productDTO= productDAO.getAllProduct(); 

      /*product.addAll(productDTO.getMaxPrice()); 
      product.addAll(0, Collection<Product_Catalog>c); 
      product.add(productDTO.getMinPrice());*/ 



     // return productDAO.getAllProduct(); 
     return product; 
    } 
}

控制器類： -

@Controller 
public class ProductController { 

    @Autowired 
    private ProductService productService; 

    @RequestMapping(value = "/", method = RequestMethod.GET) 
     public String listProducts(ModelMap map) 
     { 
      map.addAttribute("product", new Product_Catalog()); 
      map.addAttribute("productList", productService.getAllProduct()); 

      return "productList"; 
     } 
}

實體類： -

@NamedQueries({ 
    @NamedQuery(
    name = "findAllProduct", 
    query = "from Product_Catalog" 

    ) 
}) 

@Entity 
public class Product_Catalog extends baseEntity.Entity { 
    @Id 
    @Column(name="Product_Catalog_Id") 
    private int productCatalogId ; 


}

JSP： -

<html> 
<head> 
    <title>Spring 3 Hibernate integration </title> 
</head> 
<body> 

<h2>Product List</h2> 


<h3>Products</h3> 
<c:if test="${!empty productList}"> 
<table class="data"> 
<tr> 
    <!-- <th>Product_Catalog_Id</th> --> 
    <!-- <th>Requirement_Type_Id</th> --> 
    <th>Max Price</th> 
    <th>Min_Price</th> 
    <th>&nbsp;</th> 
</tr> 
<c:forEach items="${productList}" var="product"> 
    <tr> 

     <%-- <td>${product.productCatalogId}</td> --%> 
     <%-- <td>${product.requirementTypeId}</td> --%> 
     <td>${product.maxPrice}</td> 
     <td>${product.minPrice}</td> 
     <%-- <td><a href="delete/${prd.id}">delete</a></td> --%> 
    </tr> 
</c:forEach> 
</table> 
</c:if> 

</body> 
</html>

我的代碼運行良好，使用DTO出來，但在服務類從DTO所獲得的價值，當我收到的問題。請告訴我如何設置從dto到列表中的值以顯示jsp頁面上的列表。以下堆棧跟蹤： -

15:05:44,073 INFO [stdout] (http--127.0.0.1-8080-1) Max Price 20000.0 

15:05:44,073 INFO [stdout] (http--127.0.0.1-8080-1) Max Price 20000.0 

15:05:44,073 INFO [stdout] (http--127.0.0.1-8080-1) Max Price 50000.0 

15:05:44,073 INFO [stdout] (http--127.0.0.1-8080-1) Max Price 50000.0 

15:05:44,619 ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[default-host].[/usermanagement].[jsp]] (http--127.0.0.1-8080-1) Servlet.service() for servlet jsp threw exception: javax.el.PropertyNotFoundException: The class 'java.lang.Float' does not have the property 'maxPrice'. 
    at javax.el.BeanELResolver.getBeanProperty(BeanELResolver.java:661) [jboss-el-api_2.2_spec-1.0.0.Final.jar:1.0.0.Final] 
    at javax.el.BeanELResolver.getValue(BeanELResolver.java:290) [jboss-el-api_2.2_spec-1.0.0.Final.jar:1.0.0.Final] 
    at javax.el.CompositeELResolver.getValue(CompositeELResolver.java:175) [jboss-el-api_2.2_spec-1.0.0.Final.jar:1.0.0.Final] 
    at org.apache.el.parser.AstValue.getValue(AstValue.java:134) [jbossweb-7.0.1.Final.jar:7.0.2.Final] 
    at org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:187) [jbossweb-7.0.1.Final.jar:7.0.2.Final] 
    at org.apache.jasper.runtime.PageContextImpl.proprietaryEvaluate(PageContextImpl.java:935) [jbossweb-7.0.1.Final.jar:7.0.2.Final] 
    at org.apache.jsp.WEB_002dINF.views.productList_jsp._jspx_meth_c_005fforEach_005f0(productList_jsp.java:158) 
    at org.apache.jsp.WEB_002dINF.views.productList_jsp._jspx_meth_c_005fif_005f0(productList_jsp.java:116) 
    at org.apache.jsp.WEB_002dINF.views.productList_jsp._jspService(productList_jsp.java:76) 
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) [jbossweb-7.0.1.Final.jar:7.0.2.Final] 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:847) [jboss-servlet-api_3.0_spec-1.0.0.Final.jar:1.0.0.Final] 
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:369) [jbossweb-7.0.1.Final.jar:7.0.2.Final] 
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:326) [jbossweb-7.0.1.Final.jar:7.0.2.Final] 
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:253) [jbossweb-7.0.1.Final.jar:7.0.2.Final] 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:847) [jboss-servlet-api_3.0_spec-1.0.0.Final.jar:1.0.0.Final] 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:329) [jbossweb-7.0.1.Final.jar:7.0.2.Final] 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248) [jbossweb-7.0.1.Final.jar:7.0.2.Final] 
    at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:734) [jbossweb-7.0.1.Final.jar:7.0.2.Final] 
    at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:541) [jbossweb-7.0.1.Final.jar:7.0.2.Final] 
    at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:479) [jbossweb-7.0.1.Final.jar:7.0.2.Final] 
    at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:407) [jbossweb-7.0.1.Final.jar:7.0.2.Final] 
    at org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:238) [spring-webmvc-3.2.2.RELEASE.jar:] 
    at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:264) [spring-webmvc-3.2.2.RELEASE.jar:] 
    at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1208) [spring-webmvc-3.2.2.RELEASE.jar:] 
    at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:992) [spring-webmvc-3.2.2.RELEASE.jar:] 
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:939) [spring-webmvc-3.2.2.RELEASE.jar:] 
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856) [spring-webmvc-3.2.2.RELEASE.jar:] 
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:936) [spring-webmvc-3.2.2.RELEASE.jar:] 
    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:827) [spring-webmvc-3.2.2.RELEASE.jar:] 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:734) [jboss-servlet-api_3.0_spec-1.0.0.Final.jar:1.0.0.Final] 
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:812) [spring-webmvc-3.2.2.RELEASE.jar:] 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:847) [jboss-servlet-api_3.0_spec-1.0.0.Final.jar:1.0.0.Final] 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:329) [jbossweb-7.0.1.Final.jar:7.0.2.Final] 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248) [jbossweb-7.0.1.Final.jar:7.0.2.Final] 
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:275) [jbossweb-7.0.1.Final.jar:7.0.2.Final] 
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:161) [jbossweb-7.0.1.Final.jar:7.0.2.Final] 
    at org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:139) [jboss-as-web-7.0.2.Final.jar:7.0.2.Final] 
    at org.jboss.as.web.NamingValve.invoke(NamingValve.java:57) [jboss-as-web-7.0.2.Final.jar:7.0.2.Final] 
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:154) [jbossweb-7.0.1.Final.jar:7.0.2.Final] 
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) [jbossweb-7.0.1.Final.jar:7.0.2.Final] 
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) [jbossweb-7.0.1.Final.jar:7.0.2.Final] 
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:362) [jbossweb-7.0.1.Final.jar:7.0.2.Final] 
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:877) [jbossweb-7.0.1.Final.jar:7.0.2.Final] 
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:667) [jbossweb-7.0.1.Final.jar:7.0.2.Final] 
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:952) [jbossweb-7.0.1.Final.jar:7.0.2.Final] 
    at java.lang.Thread.run(Thread.java:662) [:1.6.0_43]

來源

2013-08-02 AskSharma

ProductDTO是一個簡單的POJO你爲什麼自動裝配它？您應該使用ProductDaoImpl.getAllProduct（）方法中的新運算符來實例化它。 – Ammar

你的代碼@Autowired private ProductDAO productDAO;件作品是在Web應用中的災難，你怎麼能保證線程安全對於這樣的自動裝配Autowired場。正確的方法是使用new運算符實例化ProductDTO並簡單地返回它。

錯誤的原因可能是您的Product_Catalog類似乎沒有設置者和獲取者。

來源

2013-08-02 11:30:26 varun

寒意:)春天來拯救！我敢打賭春天保證線程安全。 – WeMakeSoftware

嗯，我不同意。默認情況下所有的bean都是單例，它如何保證線程安全。 – varun

，你的代碼失敗的原因是在這裏：

product.addAll(0, Collection<Product_Catalog>c); 
product.add(productDTO.getMinPrice());

你的評論此代碼，但你試圖做的是一個Float插入到產品列表。 JSP從列表中獲取Float並嘗試調用Float.getMinPrice().

爲了避免這種情況，請將產品放入List。

來源

2013-08-02 14:28:03 WeMakeSoftware

如何使用spring Hibernate將DTO的值（實體類的對象）設置爲通用列表<實體類>

回答

相關問題