Simple usage of jquery easyui tree asynchronous loading

Simple usage of jquery easyui tree asynchronous loading

Jsp page:

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%>              My JSP 'index.jsp' starting page
 
 
     
 
 
 
     
     
     <script type="text/javascript" src="jquery/easyui/jquery.min.js"></script>    <script type="text/javascript" src="jquery/easyui/jquery.easyui.min.js"></script>    <script type="text/javascript">  function ok(){$("#file_tree").tree({url:'TestTreeServlet',lines:true,onClick:function(node){if(node.type=="file"){ var ps={"id":node.id}; $.post("ReadFileServlet",ps,function(data){ alert(data); $("#info").empty().append(data); });}}});  }    </script>        This is my JSP page. 
     
 
 
                  

Background code:

Tree menu-display the file list by path

Package servlet; import java. io. file; import java. io. IOException; import java. util. arrayList; import java. util. hashMap; import java. util. list; import java. util. map; import javax. servlet. servletException; import javax. servlet. http. httpServlet; import javax. servlet. http. httpServletRequest; import javax. servlet. http. httpServletResponse; import net. sf. json. JSONArray; // import com. google. gson. jsonArray; import util. TreeJson; public class TestTreeServlet extends HttpServlet {@ Overrideprotected void service (HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {request. setCharacterEncoding ("UTF-8"); response. setCharacterEncoding ("UTF-8"); response. setContentType ("text/html"); String id = request. getParameter ("id"); if (id = null | "". equals (id) {id = "E:/test/";} List list = readPath (Id); JSONArray json = JSONArray. fromObject (list); response. getWriter (). write (json. toString ();} public static List readPath (String path) {List list = new ArrayList (); File file = new File (path); if (file. exists () {File [] fs = file. listFiles (); if (fs! = Null & fs. length> 0) {for (int I = 0; I
 
  
0) {// There is a sub-file map. put ("state", "closed");} else {map. put ("state", "open");} map. put ("iconCls", file. isFile () = true? "Icon-file": "icon-folder"); map. put ("type", file. isFile () = true? "File": "folder"); list. add (map) ;}} System. out. println (list. toString (); return list ;}}
 

Read File Content

Package servlet; import java. io. bufferedReader; import java. io. file; import java. io. fileReader; import java. io. IOException; import java. io. inputStream; import javax. servlet. servletException; import javax. servlet. http. httpServlet; import javax. servlet. http. httpServletRequest; import javax. servlet. http. httpServletResponse; public class ReadFileServlet extends HttpServlet {@ Overrideprotected void service (HttpSe RvletRequest request, HttpServletResponse response) throws ServletException, IOException {response. setCharacterEncoding ("UTF-8"); response. setContentType ("text/html"); String fileName = request. getParameter ("id"); File file = new File (fileName); BufferedReader reader = null; StringBuffer text = new StringBuffer (""); try {reader = new BufferedReader (new FileReader (file); int line = 1; String tempString = n Ull; // read a row at a time until null is the end of the file while (tempString = reader. readLine ())! = Null) {// display the row number System. out. println (line + ":" + tempString); text. append (tempString + "\ n"); line ++;} reader. close ();} catch (IOException e) {e. printStackTrace ();} finally {if (reader! = Null) {try {reader. close () ;}catch (IOException e1) {}} response. getWriter (). write (text. toString ());}}

Page effect display: