servlet+jsp实现百度搜索自动补全功能

package com.action; import java.io.IOException; import java.sql.SQLException; import java.util.ArrayList; import java.util.List; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; /** * 执行Ajax的action * * @author Steven * */ public class AjaxAction extends HttpServlet { private String[] str; private static final long serialVersionUID = 1L; @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { doPost(req, resp); } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { // 用来接收获取符合条件的结果 List<String> strList = new ArrayList<String>(); // StringBuffer sb = new StringBuffer(); // 获取前台输入的字符，去空格，转换成小写 String content = req.getParameter("content").trim().toLowerCase(); // 如果输入的字符存在且不为空 if (content != null && !"".equals(content)) { // 将符合条件的结果放进集合中 for (String strTemp : str) { // 以字符串开头 if(strTemp != null){ if (strTemp.toLowerCase().startsWith(content)) { strList.add(strTemp); // sb.append(strTemp); // sb.append("<br/>"); } } } } if (strList.size() > 10) { // 结果集只保存前十个元素 strList = strList.subList(0, 10); } // 存放到request属性范围中 req.setAttribute("strList", strList); // 将结果在页面中输出 req.getRequestDispatcher("WEB-INF/jsp/showAjax.jsp").forward(req, resp); } @Override public void init() throws ServletException { // 初始化初始数据 // 相当于数据库 //test1(); try { str = CRUD.read(); for(int i=0; i<str.length;i++) System.out.println(str[i]); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } public void test1(){ // 初始化初始数据 // 相当于数据库 str = new String[] { "about", "above", "afraid", "after", "afternoon", "again", "age", "ago", "agree", "air", "airplane", "airport", "all", "almost", "along", "already", "also", "always", "American", "and", "angry", "away", "autumn", "aunt", "August", "ask", "as", "art", "arrive", "around", "arm", "April", "apple", "appear", "apartment", "anything", "anyone", "any", "answer", "another", "animal", "boy", "banana", "band", "idiom", "illuminate", "highlight", "heritage", "grief", "grab", "glitter", "legitimate", "likelihood", "media", "mediate", "negligible", "narrative", "offence", "offensive", "overthrow", "periodic", "publicity", "qualification", "qualitative", "reign", "repay", "replacement", "revolve", "scared", "seminar", "token", "transient", "update", "vegetation", "virgin", "zinc", "yell", "yoke", "youngster", "whereby", "ward", "vicious", "versatile", "tuck", "trigger", "transient", "transaction", "theme", "handbook", "grim", "extract", "entity", "edit", "distract", "discount", "differentiate", "destiny", "delegate", "couch" }; } }