本文主要是介绍node.js 读目录.txt文件，用 xml2js 转换为json数据，生成jstree所需的文件，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
请参阅：java : pdfbox 读取 PDF文件内书签
请注意：书的目录.txt 编码：UTF-8，推荐用 Notepad++ 转换编码。
npm install elementtree ;
npm install xml2js ;
node.js 用 elementtree读目录.txt文件，用 xml2js 转换为json数据，ejs 生成 jstree模板所需的文件。
编写 txt_etree_json.js 如下
// 读目录.txt文件，用xml2js 转换为json数据，生成jstree所需的文件
let fs = require('fs');
let process = require('process');
let path = require('path');
let readline = require('readline');
let et = require('elementtree');
let XML = et.XML;
let ElementTree = et.ElementTree;
// element = et.Element;
let subElement = et.SubElement;
let xml2js = require('xml2js');
let ejs = require('ejs');if (process.argv.length <3){console.error("usage: node txt_etree_json.js file1.txt");return 1;
}
let file1 = process.argv[2];
if (! fs.statSync(file1).isFile()) {console.error("it is not File.");return 2;
}
let ext = path.extname(file1);
if (ext.toLowerCase() != '.txt'){console.error(ext +" is not .txt");return 3;
}let file2 = file1.replace('.txt', '.htm');
console.log(file2);
let fRead = fs.createReadStream(file1);
let fWrite = fs.createWriteStream(file2);
// 创建readline接口实例
let rline = readline.createInterface({input: fRead,
// output: fWrite,terminal: true
});// 用缩排表现层级关系，假设最多5个层级
const indent1 =" ";
const indent2 =" ";
const indent3 =" ";
const indent4 =" ";var txt, title, root, edge, p_node, node1, node2, node3, node4, node5;
// line 事件
let ln =1;
rline.on('line', function(line){txt = line.trim();if (ln ==1){// 读取第一行：书名title = txt;// 创建主题节点root = et.Element("node");root.set('id', '1');root.set('text', txt);// 定义状态：state = subElement(root, "state")state.set("opened", 'true')state.set("disabled", 'true')}txt = txt.slice(0,-3); // 去掉行尾的页数if (txt.length ==0 || ln==1) ;else if (txt.length >0 && line.slice(0,1) !=' '){// 创建主题的子节点（1级节点）node1 = subElement(root, "children");node1.set('id', String(ln));node1.set('text', txt);p_node = node1; // 寄存父节点}else if (line.startsWith(indent1) && line.slice(2,3) !=' '){// 创建node1的子节点（2级节点）if (node1) node2 = subElement(node1, "children");else node2 = subElement(root, "children");node2.set('id', String(ln));node2.set('text', txt);p_node = node2;}else if (line.startsWith(indent2) && line.slice(4,5) !=' '){ // 创建node2的子节点（3级节点）if (node2) node3 = subElement(node2, "children");else if(node1) node3 = subElement(node1, "children");else node3 = subElement(root, "children");node3.set('id', String(ln));node3.set('text', txt);p_node = node3;}else if (line.startsWith(indent3) && line.slice(6,7) !=' '){// 创建node3的子节点（4级节点）if (node3) node4 = subElement(node3, "children");else if (node2) node4 = subElement(node2, "children");else if (node1) node4 = subElement(node1, "children");else node4 = subElement(root, "children");node4.set('id', String(ln));node4.set('text', txt);p_node = node4;}else if (line.startsWith(indent4) && line.slice(8,9) !=' '){// 创建node4的子节点（5级节点）if (node4) node5 = subElement(node4, "children");else if (p_node) node5 = subElement(p_node, "children");else node5 = subElement(root, "children");node5.set('id', String(ln));node5.set('text', txt);}else {console.log(txt);}ln++;
});
// 官网 www.npmjs.com/package/xml2js 查找 Options
// Parser 用于解析xml为json对象
let parser = new xml2js.Parser({explicitArray:false, mergeAttrs:true});
var etree, xml, json_str;
let filename ="jstree_template.htm";
rline.on('close', function(){etree = new ElementTree(root);xml = etree.write({'xml_declaration': false});parser.parseString(xml, function(err,res){if (err) throw err;//console.dir(res);json_str = '['+ JSON.stringify(res['node'], null,2) +']';});// 官网 ejs.bootcss.com/#docs <%- 输出非转义的数据到模板 %>//ejs.renderFile(filename, data, options, function(err, str){ejs.renderFile(filename, {title:title, mydir:json_str}, {}, function(err, str){// str => 输出渲染后的 HTML 字符串fWrite.write(str);}); console.log("line number: "+ln);
});
编写 jstree_template.htm 如下
<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=Edge"><meta name="viewport" content="width=device-width, initial-scale=1"><title><%= title%></title><script src="../js/jquery-3.2.1.min.js"></script><link rel="stylesheet" href="../js/jstree/dist/themes/default/style.css" /><script src="../js/jstree/dist/jstree.min.js"></script>
</head>
<body><!-- 搜索框 --><div class="search_input"><input type="text" id="search_a" /><img src="../js/jstree/dist/search.png" /></div><div id="treeview1" class="treeview"></div>
<script type="text/javascript">var mydir = <%- mydir%>;$("#treeview1").jstree({'core' : {"multiple" : false,'data' : mydir,'dblclick_toggle': true},"plugins" : ["search"]});//输入框输入时自动搜索var tout = false;$('#search_a').keyup(function(){if (tout) clearTimeout(tout); tout = setTimeout(function(){$('#treeview1').jstree(true).search($('#search_a').val()); }, 250);});
</script>
</body>
</html>
运行 node txt_etree_json.js your_pdf_dir.txt
生成 your_pdf_dir.htm
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