Question

我是MVC的新手，关注this link我有一个搜索页面，通过使用Solr得到了pdf元数据。我的if语句和html端的for循环不起作用

模型文件夹中的Searching.java：

public class Searching {

    public String q;

    public String outputTitle;
    public String outputAuthor;
    public String outputContent;
    public String outputPage;
    public String outputPath;

}

Application.java中的搜索功能：

    final static Form<Searching> searchForm = form(Searching.class);
    final static List<Searching> searchList = new ArrayList<Searching>(); 

public static Result search() {
Form<Searching> filledForm = searchForm.bindFromRequest();
        Searching searched = filledForm.get();

....(database connection lines)

QueryResponse response = solr.query(query);
SolrDocumentList results = response.getResults();
    if(results.isEmpty())
                System.out.println("SEARCH NOT FOUND");
    else {
        for (int i = 0; i < results.size(); ++i) {

            searched.outputTitle = (String)results.get(i).getFirstValue("title");
            searched.outputAuthor = (String)results.get(i).getFirstValue("author");
            searched.outputPage =results.get(i).getFirstValue("pageNumber").toString();
            searched.outputContent = (String)results.get(i).getFirstValue("content");
            searched.outputPath =  (String)results.get(i).getFirstValue("path");    
            searchList.add(searched);   
        }
        System.out.println("\nresults.getNumFound(): "+ searched.outputFound);
        System.out.println("results.size(): "+results.size());
        }
    return play.mvc.Results.ok(search.render(searched, searchForm, searchList)); 
    }

search.scala.html

@(searched: Searching, searchForm: Form[Searching], searchList: List[Searching])
.. some buttons,a search bar...
@if(searchList.isEmpty()) {
                <h1>Error</h1>
            } else {
                @for(search <- searchList) {
                <ul>Title: @search.outputTitle</ul> 
                <ul>Author: @search.outputAuthor <a href="@search.outputPath" download>Download PDF</a></ul>
                <ul>Number of Page(s): @search.outputPage</ul>
                }   
            }

Java代码运行良好。我可以看到终端上的输出，但是我的html端有问题，根据searchList的大小，它会多次显示一本书

Answer 1

即使我能够在聊天中帮助OP，我也明确地发布了答案 - 也许其他人遇到了这样的问题，但没有检查聊天：

问题是，即使你在for循环中有一行，你仍然使用相同的searched变量。您需要做的是在进入循环时重新初始化变量。类似的东西：

for (...) {
    searched = new Searching();
    searched.outputTitle = (String)results.get(i).getFirstValue("title");
    ....
    searchList.add(searched);
}

这解决了重复的问题，现在一切都很好。

Play Framework IF语句和FOR循环

1 个答案: