Question

如何动态地将集合注入spring bean。我所知我的作者类的例子

import java.util.List;
public class Author {
private String name;
private List<String> listOfBooks;

public Author(String name, List<String> listOfBooks) {
    this.name = name;
    this.listOfBooks = listOfBooks;
}
public Author() {
}

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public List<String> getListOfBooks() {
    return listOfBooks;
}

public void setListOfBooks(List<String> listOfBooks) {
    this.listOfBooks = listOfBooks;
}
 }

我的bean id是：

   <bean id="authorID" class="com.test.Author">
   </bean>

以及我用作Authors类的@AutoWired bean的一些地方。如果我想将书籍添加到变量“listOfBooks”。我该如何添加它。是通过使用对Authors对象的引用和访问getListOfBooks（）方法然后添加值。或者这种方法有什么最好的方法。感谢。

Answer 1

 <property name="addressList">
     <list>
        <value>Book1</value>
        <value>Book2</value>
        <value>Book3</value>
        <value>Book4</value>
     </list>
  </property>

在你的上下文文件中：

有关详细信息，请参阅此post

Answer 2

更详细的解释：

url1 <- url2 <- ""

shinyServer(function(input, output, session) {

  values <- reactiveValues(myurl = c(), parent_tab = "")

  observe({
    # make sure this is called on pageload (to look at the query string)
    # and whenever any tab is successfully changed.
    # If you want to stop running this code after the initial load was
    # successful so that further manual tab changes don't run this,
    # maybe just have some boolean flag for that.

    input$someID
    input$tab_sub_tabs
    query <- parseQueryString(session$clientData$url_search)
    url <- query$url
    if (is.null(url)) {
      url <- ""
    }

    # "depth" is how many levels the url in the query string is
    depth <- function(x) length(unlist(strsplit(x,"/")))

    # if we reached the end, done!
    if (length(values$myurl) == depth(url)) {
      return()
    }
    # base case - need to tell it what the first main nav name is
    else if (length(values$myurl) == 0) {
      values$parent_tab <- "someID"
    }
    # if we're waiting for a tab switch but the UI hasn't updated yet
    else if (is.null(input[[values$parent_tab]])) {
      return()
    }
    # same - waiting for a tab switch
    else if (tail(values$myurl, 1) != input[[values$parent_tab]]) {
      return()
    }
    # the UI is on the tab that we last switched to, and there are more
    # tabs to switch inside the current tab
    # make sure the tabs follow the naming scheme
    else {
      values$parent_tab <- paste0(tail(values$myurl, 1), "_tabs")
    }

    # figure out the id/value of the next tab
    new_tab <- unlist(strsplit(url, "/"))[length(values$myurl)+1]

    # easy peasy.
    updateTabsetPanel(session, values$parent_tab, new_tab)
    values$myurl <- c(values$myurl, new_tab)
  })
})

这样我们就是为java.util.List传递bean引用

记住：要使用上面的bean定义，你需要定义你的setter方法，使它们也应该能够处理引用。

 <property name="bookList">
     <list>
        <value>Java</value>
        <value>C++</value>
     </list>
  </property>

你的Getter和Setter将是：

 ApplicationContext context = 
             new ClassPathXmlApplicationContext("YourBeans.xml");

      Author a=(Author)context.getBean("authorID");

      a.getListOfBooks();

也相应改变吸气剂。

谢谢

Answer 3

Spring Injecting Collection在这里，您可以了解注入所有类型的集合[list,set,map]和array，并将其值作为基元/参考

将集合动态注入Spring托管bean

3 个答案: