java中用到json，java中用json,最近一个项目要对艺龙,携

java中用到json，java中用json,最近一个项目要对艺龙,携

最近一个项目要对艺龙,携程等酒店预订网站进行价格信息采集.因为这两个网站都不是省油的灯啊,多次提交ajax表单,参数编码,获取特定的城市和酒店代码等等手段,可谓过五关斩六将,总算是把数据采集回来,但是又面临一个难题:采集回来的信息是json格式的,那就涉及到json数据转换成java对象了首先要了解json数据的格式[{"CityType":"hotel","TabList":[{"TabId":"1","Name":"\\u70ED\\u95E8","NameEn":"Hot","CityList":[{"ProvinceId":null,"CityId":"0101","CityCode":"0101","CityNameCn":"\\u5317\\u4EAC","CityNameEn":"Beijing","CityThreeSign":"","CityType":"hotel","OldEnglishName":"peking"},{"ProvinceId":null,"CityId":"0201","CityCode":"0201","CityNameCn":"\\u4E0A\\u6D77","CityNameEn":"Shanghai","CityThreeSign":"","CityType":"hotel","OldEnglishName":""},{"ProvinceId":null,"CityId":"2001","CityCode":"2001","CityNameCn":"\\u5E7F\\u5DDE","CityNameEn":"Guangzhou","CityThreeSign":"","CityType":"hotel","OldEnglishName":"canton"}]}]}];jsonViewer是个好东西,不过HTTPAnalysis直接就集成了jsonViewer,不过还是前者比较轻巧:json和java之间的互换可以使用json-lib, 基本的使用可以看文档就行.网上也有一些集成的类,我建议直接看它的源代码,了解他是如何通过反射和使用临时对象解析json数据,并封装成java对象.这个json数据时list的嵌套,如果要对整个json文件解析,需要使用如下方法,需要构造跟json数据对应的Tab.class 和City.class,而且字段名称必须一致(骆驼首字母小写),提供默认构造方法,这样就可以将json数据作为一个完整的对象,想怎么干都行了.HashMap<String,Class> map = new HashMap<String,Class>();map.put("tabList", Tab.class);map.put("cityList", City.class);        /**         * 从一个JSON数组得到一个java对象集合，其中对象中包含有集合属性         * @param object         * @param clazz         * @param map 集合属性的类型 (key : 集合属性名, value : 集合属性类型class) eg: ("beansList" : Bean.class)         * @return         */        public static List getDTOList(String jsonString, Class clazz, Map map){            setDataFormat2JAVA();            JSONArray array = JSONArray.fromObject(jsonString);            List list = new ArrayList();            for(Iterator iter = array.iterator(); iter.hasNext();){                JSONObject jsonObject = (JSONObject)iter.next();                list.add(JSONObject.toBean(jsonObject, clazz, map));            }            return list;        }     由于我的需求只是需要重json数据中获取特定的信息对象,如上面的cityList,像tabList等对象我没必要去构造和获取,而且在实际使用过程中我发现JSON数据中变量如果不是首字母小写,是无法转换成JAVA对象的.这个确实很坑爹!!!!!于是乎,我就写了个直接读取和解析一个片段json数据的类,有了这个类,加上对象映射,基本上没什么解析不了package com.engine.logic.component.loader.impl.json.utils;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.util.ArrayList;import java.util.Iterator;import java.util.LinkedList;import java.util.List;import java.util.regex.Matcher;import java.util.regex.Pattern;import net.sf.json.JSONArray;import net.sf.json.JSONObject;public class JSonStrUtils {    /**     * json 数据括号自动补全     * **/    public static String autoComplete(String targetJson){        LinkedList<Character> stack = new LinkedList<Character>();        String returnStr ="";        char[] charArray = targetJson.toCharArray();        for(int i = 0;i<charArray.length;i++){            if(charArray[i]=='['||charArray[i]=='{'){//入栈                stack.addFirst(charArray[i]);            }else if(charArray[i]==']'){                //判断是否闭合                char last = stack.peekFirst();                if(last !='['){//不闭合,补 }                    returnStr+='}';                }else//闭合                {                    stack.pollFirst();                }            }else if(charArray[i]=='}'){                //判断是否闭合                char last = stack.peekFirst();                if(last !='{'){//不闭合,补 }                    returnStr+=']';                }else//闭合                {                    stack.pollFirst();                }            }            returnStr+=charArray[i];        }        for(char c:stack){            System.out.println("left in stack:"+c);        }        return returnStr;    }    /***     * 用于处理json数据中出现变量名非首字母小写的情况,利用正则匹配变量,然后把首字母变成小写     * */    public static String dealWithFirstChar(String jsonInput){        String originalInput = jsonInput;        StringBuilder inputStr = new StringBuilder(jsonInput);        String regex = "\\"(\\\\w+)\\":";        Pattern p = Pattern.compile(regex,Pattern.CASE_INSENSITIVE);        Matcher m = p.matcher(inputStr);        List<String> result=new ArrayList<String>();        while(m.find()){            String valueName = m.group(1);            String newValueName = null;            char[] words =valueName.toCharArray();            if(Character.isUpperCase(words[0])){//首字母大写,不符合变量命名规范                words[0] = Character.toLowerCase(words[0]);                newValueName = new String(words);//              System.out.println("orignal value:"+valueName+" new value :"+ newValueName);//              String regexWord = "\\""+valueName+"\\":";                String regx1 = "\\""+valueName+"\\":";                String replace = "\\""+newValueName+"\\":";                originalInput=originalInput.replaceAll(regx1, replace);            }            result.add(valueName);            inputStr.delete(0, m.end(0));            m=p.matcher(inputStr);        }        return originalInput;    }    /***     * 用户将unicode编码转换成汉字     * */    public static String UnicodeToString(String str) {        Pattern pattern = Pattern.compile("(\\\\\\\\u(\\\\p{XDigit}{4}))");        Matcher matcher = pattern.matcher(str);        char ch;        while (matcher.find()) {            ch = (char) Integer.parseInt(matcher.group(2), 16);            str = str.replace(matcher.group(1), ch + "");        }        return str;    }    /***     * 用户将汉字转换成unicode编码     * */    public static String toUNICODE(String s)    {        StringBuilder sb=new StringBuilder();        for(int i=0;i<s.length();i++)        {            if(s.charAt(i)<=256)            {                sb.append("\\\\u00");            }            else            {                sb.append("\\\\u");            }            sb.append(Integer.toHexString(s.charAt(i)).toUpperCase());        }        return sb.toString();    }    /**     * 读取json文件,转换为字符串     * */    public static String readJSonFile(String fileName){        InputStream in = null;        String jsonStr = "";        try {            in = JSonStrUtils.class.getResourceAsStream(fileName);        BufferedReader reader = new BufferedReader(new InputStreamReader(in));            String temp = reader.readLine();            while(temp!=null){                jsonStr+=temp;                temp = reader.readLine();            }            in.close();        } catch (IOException e) {            e.printStackTrace();            System.out.println("read json file failed :"+fileName);        }        return jsonStr;    }    /***     * 在指定的JSONObject 中寻找特定属性的第一个值     * */    public static List<String> findTargetProperty(JSONObject object,String propertyName,boolean isRecursive){        List<String> values = new ArrayList<String>();        for( Iterator entries = object.names().iterator();         entries.hasNext(); ){            String name = (String) entries.next();            Object value = object.get(name);            if(name.equals(propertyName)){//找到目标属性                values.add(value.toString());            }else if(isRecursive){                if(value instanceof JSONObject){                    values.addAll(findTargetProperty((JSONObject)value,propertyName,isRecursive));                }else if(value instanceof JSONArray){                    JSONArray array = (JSONArray)value;                    for(Iterator iter = array.iterator(); iter.hasNext();){                        JSONObject jsonObject = (JSONObject)iter.next();                        values.addAll(findTargetProperty(jsonObject,propertyName,isRecursive));                    }                }            }        }        return values;    }    /***     * 从指定的JSonArray中寻找指定名称的子json数组     * */    public  static List<JSONArray> findTargetJSonArray(JSONArray array,String targetName){        List<JSONArray> arrays = new ArrayList<JSONArray>();        for(Iterator iter = array.iterator(); iter.hasNext();){//遍历数组中的JSONObject            JSONObject jsonObject = (JSONObject)iter.next();            if( jsonObject == null || jsonObject.isNullObject() ){                 continue;            }            for( Iterator entries = jsonObject.names().iterator();             entries.hasNext(); ){                 String name = (String) entries.next();                 Object value = jsonObject.get(name);                 if(value instanceof JSONArray){//属性为数组                     //先判断是否目标数组                     if(name.equals(targetName)){                         arrays.add((JSONArray) value);                     }                     //递归查找                     arrays.addAll(findTargetJSonArray((JSONArray) value,targetName));                 }            }        }        return arrays;    }}//该片段来自于http://byrx.net