struts2 doubleselect标签的用法例子

package com.action; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import com.Book; import com.Category; public class DemoAction { private Map<Integer, List<Book>> bookMap; private List<Category> categoryList; public String execute() throws Exception { categoryList = new ArrayList<Category>(); Category category; category = new Category(); category.setId(1); category.setName("Fiction"); categoryList.add(category); category = new Category(); category.setId(2); category.setName("Java"); categoryList.add(category); bookMap = new HashMap<Integer, List<Book>>(); List<Book> bookList = new ArrayList<Book>(); Book book; book = new Book(); book.setId(1); book.setName("Harry Porter"); book.setCategoryId(1); bookList.add(book); book = new Book(); book.setId(2); book.setName("Nightmare"); book.setCategoryId(1); bookList.add(book); bookMap.put(1, bookList); bookList = new ArrayList<Book>(); book = new Book(); book.setId(3); book.setName("Thinking in Java"); book.setCategoryId(2); bookList.add(book); book = new Book(); book.setId(4); book.setName("Head First Design Patterns"); book.setCategoryId(2); bookList.add(book); bookMap.put(2, bookList); return "success"; } public Map<Integer, List<Book>> getBookMap() { return bookMap; } public void setBookMap(Map<Integer, List<Book>> bookMap) { this.bookMap = bookMap; } public List<Category> getCategoryList() { return categoryList; } public void setCategoryList(List<Category> categoryList) { this.categoryList = categoryList; } }