jsp页面：
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html> <head><base href="<%=basePath%>"><title>My JSP 'index.jsp' starting page</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0"><meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><!–<link rel="stylesheet" type="text/css" href="styles.css">–><link rel="stylesheet" type="text/css" href="jquery/easyui/themes/default/easyui.css"><link rel="stylesheet" type="text/css" href="jquery/easyui/themes/icon.css"><link rel="stylesheet" type="text/css" href="jquery/easyui/demo/demo.css"><script type="text/javascript" src="jquery/easyui/jquery.min.js"></script><script type="text/javascript" src="jquery/easyui/jquery.easyui.min.js"></script> </head> <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><body onload="ok()">This is my JSP page. <br><ul id="file_tree"></ul><div id="info"></div> </body></html>
后台代码：
树形菜单—根据路径显示文件列表
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<fs.length;i++){Map map = new HashMap();map.put("id", fs[i].getAbsolutePath());map.put("text", fs[i].getName());if(fs[i].isDirectory()){map.put("type", "folder");if(fs[i].listFiles()==null || fs[i].listFiles().length==0){map.put("iconCls", "icon-folder");map.put("state", "open");}else{map.put("state", "closed");}}else{map.put("type", "file");map.put("state", "open");}list.add(map);}}else{Map map = new HashMap();map.put("id", file.getAbsolutePath());map.put("text", file.getName());if(file.listFiles()!=null && file.listFiles().length>0){//还有子文件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;} }
读取文件内容
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(HttpServletRequest 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=null;// 一次读入一行，，直到读入null为文件结束while ((tempString = reader.readLine()) != null) {// 显示行号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());}}
页面效果展示：别小看任何人，越不起眼的人。往往会做些让人想不到的事。
