But I don't think it's useful for me to organize TAPESTRY application effectlly. That books just represent basic programming Philosophy . Jesse Kuhnert 写道: > +1 I picked it up after seeing Howard mentioned it and loved it. :) > > On 5/22/07, Howard Lewis Ship <[EMAIL PROTECTED]> wrote: >> >> The book "The Pragmatic Programmer" is an excellent start on learning >> how >> to >> organize your code and your mind and work effectively, >> professionally, and >> pragmatically. >> >> http://www.powells.com/biblio/65-9780201616224-0 >> >> On 5/21/07, Allen Guo <[EMAIL PROTECTED]> wrote: >> > >> > Thanks , It's running now >> > But suppose there is five properties of Product is relative with image >> > Product class looks like >> > class Product{ >> > private String _img1; >> > private String _img2; >> > private String _img3; >> > private String _img4; >> > private String _img5; >> > .... >> > } >> > >> > So for show the img, I have to define the corresponding Img url in >> > ProductDetai.java like >> > // ProductDetail.java >> > class ProductDetail{ >> > private String _imgUrl1; >> > private String _imgUrl2; >> > private String _imgUrl3; >> > private String _imgUrl4; >> > private String _imgUrl5; >> > public String getProductImageURL1() { >> > return "http://static.myco.com/product-images/"; + _imgUrl1 + ".gif"; >> > } >> > public String getProductImageURL2() { >> > return "http://static.myco.com/product-images/"; + _imgUrl2 + ".gif"; >> > } >> > public String getProductImageURL3() { >> > return "http://static.myco.com/product-images/"; + _imgUrl3 + ".gif"; >> > } >> > public String getProductImageURL4() { >> > return "http://static.myco.com/product-images/"; + _imgUrl4 + ".gif"; >> > } >> > public String getProductImageURL5() { >> > return "http://static.myco.com/product-images/"; + _imgUrl5 + ".gif"; >> > } >> > } >> > Imagine another simple page like ProductList, >> > I have to define another list to show the image even there is only a >> > dynamic image for every product >> > The ProductList may look like >> > // ProductList.java >> > class ProductList{ >> > private List _productList; >> > private List _imgList; >> > ...... >> > } >> > Oh god , so terrible codes. >> > There are a lot of similar require my project. >> > Can you give me more suggestion? >> > >> > Howard Lewis Ship 写道: >> > >> > > In order to answer this question, some background is needed. >> > > >> > > If you know the product's id (whatever you use, where it's SKU >> number >> > > or a >> > > surrogate key) ... what is the exact process from going from that >> to a >> > > URL >> > > suitable for an <img> tag? >> > > >> > > That is ... are the images stored in the database? Or are they on >> the >> > > file >> > > system somewhere? If they are files on the file system, are those >> files >> > > mapped to a client-visible URL? >> > > >> > > In the latter case, you can do something like: >> > > >> > > <img t:id="productImage" src="prop:productImageURL"/> >> > > >> > > public String getProductImageURL() { >> > > return "http://static.myco.com/product-images/"; + _productId + >> ".gif"; >> > > } >> > > >> > > >> > > >> > > Assigning a t:id to a tag without specifying a component type >> creates >> > > an Any >> > > component, a component that just renders whatever tag and informal >> > > parameters you provide it. Here wer'e linking that to some Java code >> > > in the >> > > corresponding page or component that computes the URL of the product >> > > based >> > > on an instance variable. Probably your example is more complicated, >> > > but you >> > > get the idea. >> > > >> > > There's another approach used when the data is inside the database, >> > > but we >> > > can dive into that if the above solution is insufficient. >> > > >> > > Assets are useful for accessing resources inside the web application >> > > context, or on the classpath, and includes logic related to >> > > localization ... >> > > but it is not always appropriate when accessing resources that are >> well >> > > outside the web application itself. >> > > >> > > On 5/19/07, Allen Guo <[EMAIL PROTECTED]> wrote: >> > >> >> > >> Hi All, >> > >> >> > >> I want to show the ProductDetail page with product image. It looks >> like >> > >> <img src="p_001.jpg" />. >> > >> You know, every product has different image name,so I need to pass >> the >> > >> string 'p_001.jpg' to the corresponding page. >> > >> As result the img tag should look like <img >> src="${product.image}"/> >> or >> > >> I can use Asset to do it. >> > >> >> > >> But I tried to do it using the first approach, exception occured. >> > >> And I don't know how to the second approach. >> > >> Can anyone give me an idea? >> > >> >> > >> Thank in advance >> > >> Allen Guo >> > >> >> > >> >> > >> >> --------------------------------------------------------------------- >> > >> To unsubscribe, e-mail: [EMAIL PROTECTED] >> > >> For additional commands, e-mail: [EMAIL PROTECTED] >> > >> >> > >> >> > > >> > > >> > >> > >> > --------------------------------------------------------------------- >> > To unsubscribe, e-mail: [EMAIL PROTECTED] >> > For additional commands, e-mail: [EMAIL PROTECTED] >> > >> > >> >> >> -- >> Howard M. Lewis Ship >> TWD Consulting, Inc. >> Independent J2EE / Open-Source Java Consultant >> Creator and PMC Chair, Apache Tapestry >> Creator, Apache HiveMind >> >> Professional Tapestry training, mentoring, support >> and project work. http://howardlewisship.com >> > > >
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