Question

我已经在servlet中使用此代码保存了图像。 productSubType和Product是我数据库中的表。 ProductSubType的foriegn键包含在Product表中。

    try (PrintWriter out = response.getWriter()) {

        Session s = connection.NewHibernateUtil.getSessionFactory().openSession();


        String name=request.getParameter("fupload");
        File f= new File(getServletContext().getRealPath("/")+""+name);
        ProductSubType p_Stype = new ProductSubType();
        p_Stype=(ProductSubType) s.load(ProductSubType.class, Integer.parseInt(request.getParameter("p_combo")));

        Product p = new Product();
        p.setPName(request.getParameter("p_name"));           
        p.setKeyWords(request.getParameter("keywords"));           
        p.setQuality(request.getParameter("width")+","+request.getParameter("height"));           
        p.setProductSubType(p_Stype);           
        p.setProduct(f.getPath());           
        p.setPrice(request.getParameter("price"));

        s.save(p);
        s.beginTransaction().commit();
        response.sendRedirect("add_image.jsp");

    }

这是我的产品类

    public class Product  implements java.io.Serializable {


 private Integer idproduct;
 private ProductSubType productSubType;
 private String PName;
 private String quality;
 private String product;
 private String price;
 private String keyWords;
 private Set<Upload> uploads = new HashSet<Upload>(0);
 private Set<InvoiceHasProduct> invoiceHasProducts = new HashSet<InvoiceHasProduct>(0);
 private Set<CartHasProduct> cartHasProducts = new HashSet<CartHasProduct>(0);
 private Set<Download> downloads = new HashSet<Download>(0);

public Product() {
}


public Product(ProductSubType productSubType) {
    this.productSubType = productSubType;
}
public Product(ProductSubType productSubType, String PName, String quality, String product, String price, String keyWords, Set<Upload> uploads, Set<InvoiceHasProduct> invoiceHasProducts, Set<CartHasProduct> cartHasProducts, Set<Download> downloads) {
   this.productSubType = productSubType;
   this.PName = PName;
   this.quality = quality;
   this.product = product;
   this.price = price;
   this.keyWords = keyWords;
   this.uploads = uploads;
   this.invoiceHasProducts = invoiceHasProducts;
   this.cartHasProducts = cartHasProducts;
   this.downloads = downloads;
}

public Integer getIdproduct() {
    return this.idproduct;
}

public void setIdproduct(Integer idproduct) {
    this.idproduct = idproduct;
}
public ProductSubType getProductSubType() {
    return this.productSubType;
}

public void setProductSubType(ProductSubType productSubType) {
    this.productSubType = productSubType;
}
public String getPName() {
    return this.PName;
}

public void setPName(String PName) {
    this.PName = PName;
}
public String getQuality() {
    return this.quality;
}

public void setQuality(String quality) {
    this.quality = quality;
}
public String getProduct() {
    return this.product;
}

public void setProduct(String product) {
    this.product = product;
}
public String getPrice() {
    return this.price;
}

public void setPrice(String price) {
    this.price = price;
}
public String getKeyWords() {
    return this.keyWords;
}

public void setKeyWords(String keyWords) {
    this.keyWords = keyWords;
}
public Set<Upload> getUploads() {
    return this.uploads;
}

public void setUploads(Set<Upload> uploads) {
    this.uploads = uploads;
}
public Set<InvoiceHasProduct> getInvoiceHasProducts() {
    return this.invoiceHasProducts;
}

public void setInvoiceHasProducts(Set<InvoiceHasProduct> invoiceHasProducts) {
    this.invoiceHasProducts = invoiceHasProducts;
}
public Set<CartHasProduct> getCartHasProducts() {
    return this.cartHasProducts;
}

public void setCartHasProducts(Set<CartHasProduct> cartHasProducts) {
    this.cartHasProducts = cartHasProducts;
}
public Set<Download> getDownloads() {
    return this.downloads;
}

public void setDownloads(Set<Download> downloads) {
    this.downloads = downloads;
}

}

保存图像。保存没有错误。但图像的路径将保存到数据库中 - ＆gt; E：... \ ProjectName \ build \ web \ 190847.png

这是对的吗？如果是这样，我如何检索图像并在页面中显示它们？

Answer 1

每次在服务器上上传图像文件时。我们应该在数据库中存储图像的相对路径或虚拟路径，以便可以从html页面查看这些路径或虚拟路径。就像你需要存储图像的路径一样，如下所示：

http://yourserverdomain/web/image_name.png

还要确保服务器上的Web文件夹是公用文件夹。

如何使用netbeans中的hibernate将图像保存到mysql数据库以及如何和退出它并显示

1 个答案: