zTree异步加载简单demo

这几天花了些时间,试了试zTree自带的异步加载方式 还不错.

有个奇怪的问题:

无论我在服务器设置 setContentType("text/plain;charset=UTF-8")或是 setContentType("application/json;charset=UTF-8"),zTree都会把接收到的数据当json格式,除非不符合json格式.

(另:JSONBuilder是个简单的json处理类,适用于不复杂的数据格式)

以下是简单的demo

 

test2.html

 

test2Action.jsp

<%@ page language="java" contentType="text/html; charset=utf-8" %>
<%@ page pageEncoding="utf-8"%>
<%@ page import="java.util.List" %>
<%@ page import="java.util.LinkedList" %>
<%@ page import="java.io.PrintWriter" %>
<%@ page import="org.sl.json.JSONBuilder" %>
<%@ page import="java.util.Random" %>





<%
// String json = "{\"count\":\"3\",\"id[0]\":\"id_0\",\"id[1]\":\"id_1\",\"id[2]\":\"id_2\"}";
//String json = "{\"count\":\"2\",\"id[0]\":\"id_0\",\"id[1]\":\"id_1\",\"name[0]\":\"name_0\",\"name[1]\":\"name_1\",}";
String json = null;
Random rand = new Random(System.currentTimeMillis());
int count = rand.nextInt(8)+2;
JSONBuilder js = new JSONBuilder();

js.put("count", ""+count);
for(int i=0; i application/json text/x-json 

// response.setContentType("text/plain;charset=UTF-8");
response.setContentType("application/json;charset=UTF-8");
response.setCharacterEncoding("UTF-8"); 
PrintWriter pw = response.getWriter(); 
pw.write(json); 
pw.flush(); 
pw.close();
%>

JSONBuilder.java

package org.sl.json;

import java.util.Enumeration;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Properties;

/**
 * 可以用来处理格式比较简单的json字符串
 * @author shanl
 *
 */
public class JSONBuilder {
//	private Properties dict = new Properties();
	private Map dict = new LinkedHashMap(20);
	
	/**
	 * 写入一个键/值对
	 * @param key
	 * @param value
	 */
	public void put(String key, String value){		
		this.dict.put(replaceJsonChar(key), replaceJsonChar(value));
	}
	
	private String replaceJsonChar(String str){
		StringBuilder sb = new StringBuilder();		
		char[] chs = str.toCharArray();
		
		for(char c: chs){
			switch (c) { 
	        case '\"': 
	            sb.append("\\\""); 
	            break; 
	        case '\\': 
	            sb.append("\\\\"); 
	            break; 
	        case '/': 
	            sb.append("\\/"); 
	            break; 
	        case '\b': 
	            sb.append("\\b"); 
	            break; 
	        case '\f': 
	            sb.append("\\f"); 
	            break; 
	        case '\n': 
	            sb.append("\\n"); 
	            break; 
	        case '\r': 
	            sb.append("\\r"); 
	            break; 
	        case '\t': 
	            sb.append("\\t"); 
	            break; 
	        default: 
	            sb.append(c); 
	        } 
		}
		
		return sb.toString();
	}
	
	/**
	 * 返回键/值对列表
	 * @return
	 */
	public Map getDict(){
		return dict;
	}
	
	/**
	 * 返回键所对应的值
	 * @param key
	 * @return
	 */
	public String getValue(String key){
		return dict.get(key);
	}
	
	/**
	 * 解析json格式字符串
	 * @param json
	 */
	public void parseJsonString(String json){
		String _json = json;
		String[] ss = null;
		String[] tmp = null;		
		
		_json = _json.trim(); //去掉两端空格
		_json = _json.substring(2); //去掉 {"
		_json = _json.substring(0, _json.length()-2); //去掉 }"
		
		ss = _json.split("\",\"");
		for(String s: ss){
			tmp = s.split("\":\"");
			put(tmp[0], tmp[1]);
		}
	}
	
	/**
	 * 将数据转换成json格式字符串
	 * @return
	 */
	public String toJsonString(){
		String sb = "";
		String key = null;
		String value = null;
		Iterator keys = dict.keySet().iterator();
//		Enumeration keys = dict.propertyNames(); 
		
		sb += "{";
		
		while(keys.hasNext()){
			key = keys.next();
			value = dict.get(key);
			
			sb += "\""+ key +"\":";
			sb += "\""+ value +"\",";
		}
		
		if(sb.endsWith(",") ){
			sb = sb.substring(0, sb.length()-1);
		}
		
		sb += "}";
		
		return sb.toString();
	}
	
	public String toString(){
		return toJsonString();
	}
}

JSONBuilder测试类, Test2.java:

package test1;

import org.sl.json.JSONBuilder;

public class Test2 {
	public static void main(String[] args){
		t7();		
//		t1();
	}
	
	static void t7(){
		String str = "{\"count\":\"3\",\"id[0]\":\"id_0\",\"id[1]\":\"id_1\",\"id[2]\":\"id_2\"}";
		JSONBuilder js = new JSONBuilder();
		js.parseJsonString(str);
		
		System.out.println(js.getValue("id[1]"));
	}
	
	static void t6(){
		JSONBuilder js = new JSONBuilder();
		js.put("abc\"sasas", "sasjajsas\"saas");
		
		System.out.println(js.toJsonString());
	}
	
	static void t5(){
		String str = "{\"count\":\"3\",\"id[0]\":\"id_0\",\"id[1]\":\"id_1\",\"id[2]\":\"id_2\"}";
		JSONBuilder js = new JSONBuilder();
		
		js.parseJsonString(str);
		System.out.println(js.getValue("count"));
		System.out.println(js.getValue("id[0]"));
	}
	
	static void t4(){
		String str = "'{\"count\":\"3\",\"id[0]\":\"id_0\",\"id[1]\":\"id_1\",\"id[2]\":\"id_2\"}'";
		JSONBuilder js = new JSONBuilder();
		
		js.parseJsonString(str);
		System.out.println(js.getValue("count"));
	}
	
	static void t3(){
		String str = "'{\"count\":\"3\",\"id[0]\":\"id_0\",\"id[1]\":\"id_1\",\"id[2]\":\"id_2\"}'";
		String[] ss = str.split("\",\"");
		
		for(String s: ss){
			System.out.println(s);
		}
	}
	
	static void t2(){
		JSONBuilder js = new JSONBuilder();
		String str = "'{\"count\":\"3\",\"id[0]\":\"id_0\",\"id[1]\":\"id_1\",\"id[2]\":\"id_2\"}'";
		str = str.trim();
		str = str.substring(3);
		str = str.substring(0, str.length()-3);
		
		System.out.println(str);
		System.out.println();
		
		String[] tmp = null;
		String[] ss = str.split("\",\"");
		
		for(String s: ss){
			tmp = s.split("\":\"");
			js.put(tmp[0], tmp[1]);
		}
		
		System.out.println(js.getValue("count"));
	}
	
	static public void t1(){
		JSONBuilder js = new JSONBuilder();
		int c = 3;
		
		js.put("count", c+"");
		
		for(int i=0; i