解析json

在网络上找了下解析json格式文件的源代码，好久都没找到。 比如得到一个json格式的任意文件，便可以知道其内部的格式和内容。于是便写了一个。下面是自己写的解析内容。
（
1.如果有不对的地方，还希望大家能帮忙指正。
2.如果有更好的解析json格式的代码，希望能分享下，给下链接，多谢。^_^
）

注：在代码中需要json源文件的支持，是为了来判断提供的字符串是否是json格式的字符串，下载地址是：http://www.json.org/java/index.html。

package com.utils;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.util.ArrayList;
import java.util.List;
import java.util.Stack;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * 
 * 1. what are in the stack:
 * 		two parts: 	the name of jsonObject or jsonArray, the sign after: [ or {. Such as: data[, observation{.
 * 					the reason for the sign after put into the stack  is to know it is a jsonObject or jsonArray.
 * 					what are in the stack are the parent jsonItem that the children will be put into.
 * 2. the result.
 * 		you will get one JSONItem object. It is the "outest" JSONObject.
 * 		you can get others by its children and its children's children.
 * @author yuanbo han
 *
 */
public class JSONParser {
	public static final String icons_regex = "[\\{\\}\\[\\]]";
	public static final String signs_split_regex = "[:,\\{\\}\\[\\]]";
	public static final String all_sign_regex_for_remove = "[:,\"\\{\\}\\[\\]]";
	public static final String attribute_regex = "[,\\{\\}\\[\\]]";
	
	private String jsonString;
	private Object container;

	public JSONParser(String jsonString) {
		super();
		this.jsonString = jsonString;
	}
	
	public JSONItem getOutestJSONItem(){
		if(!this.isJsonFormat(jsonString)){
			JSONItem item = new JSONItem();
			item.setName("format error");
			item.setType(null);
			item.setChildren(null);
			item.setAttributes(null);
			return item;
		}
		
		List<JSONItem> items = new ArrayList<JSONItem>();
		JSONItem outest = new JSONItem();
		outest.setName("outest");
		outest.setType(JSONItem.OBJECT);
		items.add(outest);//put a outest JSONItem. No name for it, so I set outest.
		
		Stack<String> stack = new Stack<String>();
		Matcher matcher = Pattern.compile(signs_split_regex).matcher(jsonString);
		
		
		int last_sign_index = 0;// in order to find what I want, two indexes help to locate where it is. This is the first one.
		JSONItem current = outest;
		while(matcher.find()){
			int sign_index = matcher.start();// in order to find what I want, two indexes help to locate where it is. This is the second one.
			String sign = matcher.group();
			if(!sign.trim().equals(",")){
				if(sign.trim().equals(":")){//the outer jsonObject or jsonArray. The string before the colon is the name. Or the attributes.
					if(getCodeBefore(jsonString,sign_index).equals("\"")){
						String code_after = getCodeAfter(jsonString,sign_index);//{ , [ or other things.
						if(code_after.matches(icons_regex)){//{ or [. jsonArray or jsonObject
							String name_origin = jsonString.substring(last_sign_index, sign_index).trim();
							String name = removeSigns(name_origin);
							JSONItem item = new JSONItem();
							item.setName(name);
							if(isJsonObjectItem(code_after)){
								item.setType(JSONItem.OBJECT);
							}else{
								item.setType(JSONItem.ARRAY);
							}
							items.add(item);
							current = item;// current jsonItem. This is for the attribute part. to get whose attribute it is.
							
							String parentName = removeSigns(stack.peek());
							JSONItem parent = getJSONItem(items,parentName);
							if(parent != null){
								parent.addChild(item);
							}
							
							stack.push(name+code_after);
						}else if(isAttribute(jsonString,sign_index)){// attributes
							String key_origin = jsonString.substring(last_sign_index, sign_index);
							String key = removeSigns(key_origin);
							String value = getAttributeValueAfter(jsonString,sign_index);
							current.addAttribute(key,value);
						}
					}
				}else{// "[" or "]" or "{" or "}".
					if(!stack.empty()){
						String header = stack.peek();
						if(isPair(header,sign)){
							stack.pop();
						}else{
							if(!getCodeBefore(jsonString,sign_index).equals(":")){// inner child or array. no name.
								JSONItem item = new JSONItem();
								if(isJsonObjectItem(sign)){
									item.setType(JSONItem.OBJECT);
								}else{
									item.setType(JSONItem.ARRAY);
								}
								items.add(item);
								current = item;
								
								String parentName = removeSigns(header);
								JSONItem parent = getJSONItem(items,parentName);
								if(parent != null){
									parent.addChild(item);
								}
								
								stack.push(sign);
							}
						}
					}else{// the first time
						stack.push("outest" + sign);
					}
				}
			}
			
			last_sign_index = sign_index;// if the sign is ",", just remember its position. It is the meaning of the sign "," in the process. To ensure that the String between the last_sign_index and the sign_index does not contain ",".
		}
		JSONItem result = getJSONItem(items,"outest");;
		processJSONItem(result);
		return result;
	}
	
	/**
	 * to give a name to each child of jsonArray.
	 * @param item
	 */
	private void processJSONItem(JSONItem item){
		if(item.getChildren() != null && item.getChildren().size() > 0){
			int count = 0;
			for(JSONItem child : item.getChildren()){
				if(child.getName().trim().equals("")){
					child.setName(item.getName() + "_" +count + "");
					count++;
				}
				processJSONItem(child);
			}
		}
	}
	
	public static String removeSigns(String origin_name){
		if(origin_name != null){
			String name = origin_name.replaceAll(all_sign_regex_for_remove, "").trim();
			return name;
		}
		return null;
	}
	
	/**
	 * to find the jsonItem of the give name.
	 * null if not exist.
	 * @param JSONItems
	 * @param name
	 * @return
	 */
	public static JSONItem getJSONItem(List<JSONItem> JSONItems, String name){
		if(JSONItems != null && name != null && !name.trim().equals("")){
			for(JSONItem item : JSONItems){
				if(item.getName().trim().equals(name.trim())){
					return item;
				}
			}
		}
		return null;
	}
	
	public static boolean isJsonObjectItem(String sign){
		if(sign.trim().equals("{")){
			return true;
		}
		return false;
	}

	public static boolean isPair(String former, String latter){
		if(former.contains("{") && latter.contains("}") 
				|| former.contains("}") && latter.contains("{") 
				|| former.contains("[") && latter.contains("]") 
				|| former.contains("]") && latter.contains("[")){
			return true;
		}
		return false;
	}
	
	/**
	 * Get the one char just right before the index in the content. But the one char does not match "\\s". 
	 * @param content
	 * @param index
	 * @return
	 */
	public static String getCodeBefore(String content, int index){
		for(int i=index-1;i>=0;i--){
			String sign = String.valueOf(content.charAt(i));
			if(!sign.matches("\\s")){
				return sign;
			}
		}
		return null;
	}
	

	/**
	 * Get the one char just right after the index in the content. But the one char does not match "\\s".
	 * @param content
	 * @param index
	 * @return
	 */
	public static String getCodeAfter(String content, int index){
		for(int i=index+1;i<content.length();i++){
			String sign = String.valueOf(content.charAt(i));
			if(!sign.matches("\\s")){
				return sign;
			}
		}
		return null;
	}
	
	/**
	 * Get the one char just right before the index in the content. But the one char does not match "\\w" and the one char is not blank.
	 * @param content
	 * @param index
	 * @return
	 */
	public static String getSignBefore(String content, int index){
		for(int i=index-1;i>=0;i--){
			String sign = String.valueOf(content.charAt(i));
			if(!sign.equals(" ") && !sign.matches("\\w")){
				return sign;
			}
		}
		return null;
	}
	
	/**
	 * Get the one char just right after the index in the content. But the one char does not match "\\w" and the one char is not blank.
	 * @param content
	 * @param index
	 * @return
	 */
	public static String getSignAfter(String content, int index){
		for(int i=index+1;i<content.length();i++){
			String sign = String.valueOf(content.charAt(i));
			if(!sign.equals(" ") && !sign.matches("\\w")){
				return sign;
			}
		}
		return null;
	}
	
	/**
	 * the first_quote_bofore_index and second_quote_bofore_index is to find the name of the attribute.
	 * code_before is to ensure that the sign before the the attribute name is "," or "[" or "{".
	 * @param content
	 * @param index
	 * @return
	 */
	public static boolean isAttribute(String content, int index){
		int first_quote_bofore_index = content.lastIndexOf("\"", index);
		if(first_quote_bofore_index == -1){
			return false;
		}
		int second_quote_bofore_index = content.lastIndexOf("\"",first_quote_bofore_index - 1);
		if(second_quote_bofore_index == -1){
			return false;
		}
		String code_before = getCodeBefore(content,second_quote_bofore_index);
		
		if(code_before.matches(attribute_regex)){
			return true;
		}
		return false;
	}
	
	/**
	 * the value of the attribute are object, string, or number
	 * so some are quoted, but some are not.
	 * @param content
	 * @param index
	 * @return
	 */
	public static String getAttributeValueAfter(String content, int index){
		String result = "";
		String icon = getSignAfter(content,index);
		if(icon.equals("\"")){
			int former_quote_index = content.indexOf("\"", index);
			int latter_quote_index = content.indexOf("\"", former_quote_index + 1);
			result = content.substring(former_quote_index + 1, latter_quote_index);
		}else{
			int icon_index = content.indexOf(icon, index + 1);
			result = content.substring(index+1, icon_index);
		}
		
		return result;
	}

	public boolean isJsonFormat(String string){
		try {
			new JSONObject(string);
		} catch (JSONException e) {
			return false;
		}
		return true;
	}
	
	/**
	 * from the root jsonItem.
	 * @param root
	 */
	public static void printJSONItem(JSONItem root){
		if(root.getName().trim().equals("")){
			System.out.println("inner child, " + root.getType());
		}else{
			System.out.println(root.getName() + ", " + root.getType());
		}
		if(root.getAttributes().size() > 0){
			for(String key : root.getAttributes().keySet()){
				System.out.println("\t key:" + key + ", value:" + root.getAttributes().get(key));
			}
		}
		if(root.getChildren().size() > 0){
			for(JSONItem item : root.getChildren()){
				printJSONItem(item);
			}
		}
	}
	

	/**
	 * loop to find the container of the given name in the jsonString
	 * @param container
	 * @param outest
	 * @param name
	 * @return
	 */
	private void getContainer(Object container, JSONItem outest, String name){
		if(outest != null && container != null && name != null){
			if(name.trim().equals("")){
				this.container = outest;
			}else if(name.equals(outest.getName())){
				this.container = container;
			}else{
				try {
					List<JSONItem> children = outest.getChildren();
					if(children != null && children.size() > 0){
						for(int i=0;i<children.size();i++){
							
							JSONObject jo = null;
							JSONArray ja = null;
							if(container instanceof JSONObject){
								jo = (JSONObject)container;
							}else if(container instanceof JSONArray){
								ja = (JSONArray)container;
							}
							
							JSONItem child = children.get(i);
							String child_type = child.getType();
							String child_name = child.getName();
							if(jo != null){
								if(child_type.equals(JSONItem.ARRAY)){
									ja = jo.getJSONArray(child_name);
									getContainer(ja,child,name);
								}else if(child_type.equals(JSONItem.OBJECT)){
									jo = jo.getJSONObject(child_name);
									getContainer(jo,child,name);
								}
							}else if(ja != null){
								if(child_type.equals(JSONItem.ARRAY)){
									ja = ja.getJSONArray(i);
									getContainer(ja,child,name);
								}else if(child_type.equals(JSONItem.OBJECT)){
									jo = ja.getJSONObject(i);
									getContainer(jo,child,name);
								}
							}
						}
					}
				} catch (JSONException e) {
					
				}
			}
		}
	}
	

	public Object getContainerObject(Object container, JSONItem outest, String name) {
		this.getContainer(container, outest, name);
		return this.container;
	}

	public void setContainer(Object container) {
		this.container = container;
	}
	
	public String getJsonString() {
		return jsonString;
	}

	public void setJsonString(String jsonString) {
		this.jsonString = jsonString;
	}
	
	public static void main(String[] args) throws Exception{
		String jsonString = FileUtil.getFileContent("c:\\json.txt");
		JSONParser parser = new JSONParser(jsonString);
		
		JSONItem outest = parser.getOutestJSONItem();
		JSONObject jo = new JSONObject(jsonString);
		String name = "data_5";
		
		Object result = parser.getContainerObject(jo, outest, name);
		
		JSONArray ja_container = null;
		JSONObject jo_container = null;
		if(result instanceof JSONObject){
			jo_container = (JSONObject)result;
		}else if(result instanceof JSONArray){
			ja_container = (JSONArray)result;
		}
		
		if(ja_container != null){
			System.out.println(ja_container.length());
		}else if(jo_container != null){
			System.out.println(jo_container.getInt("sort_order"));
		}
		
	}
}

package com.utils;

import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

public class JSONItem {
	public static final String ARRAY = "arr";
	public static final String OBJECT = "obj";
	private String name = "";// name
	private String type = "";// array or object
	private Map<String,String> attributes = new LinkedHashMap<String,String>();
	private List<JSONItem> children = new ArrayList<JSONItem>();
	
	
	public JSONItem() {
		super();
	}

	public JSONItem(String name, String type) {
		super();
		this.name = name;
		this.type = type;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getType() {
		return type;
	}

	public void setType(String type) {
		this.type = type;
	}

	public Map<String, String> getAttributes() {
		return attributes;
	}

	public void setAttributes(Map<String, String> attributes) {
		this.attributes = attributes;
	}
	
	public void addAttribute(String key, String value){
		this.attributes.put(key, value);
	}

	public List<JSONItem> getChildren() {
		return children;
	}

	public void setChildren(List<JSONItem> children) {
		this.children = children;
	}
	
	public void addChild(JSONItem child){
		this.children.add(child);
	}
	
	

	@Override
	public boolean equals(Object obj) {
		if(obj == null){
			return false;
		}
		
		if(obj instanceof JSONItem){
			JSONItem item = (JSONItem)obj;
			if(item.getName().equals(this.name) && item.getType().equals(this.name)){
				return true;
			}
		}
		
		return false;
	}

	@Override
	public String toString() {
		String result = "";
		result += ("name: " + name + ", ");
		result += ("type: " + type + ", ");
		result += ("attributes: " + attributes.toString() + ", ");
		result += ("children size: " + children.size());
		
		return result;
	}
	
	
}

下面是最近经常处理的json格式的文件。地址为：http://www.bom.gov.au/fwo/IDS60801/IDS60801.95655.json

{
	"observations": {
		"notice": [
			{
				"copyright": "Copyright Commonwealth of Australia 2010, Bureau of Meteorology. For more information see: http://www.bom.gov.au/other/copyright.shtml http://www.bom.gov.au/other/disclaimer.shtml",
				"copyright_url": "http://www.bom.gov.au/other/copyright.shtml",
				"disclaimer_url": "http://www.bom.gov.au/other/disclaimer.shtml",
				"feedback_url": "http://www.bom.gov.au/other/feedback"
			}
		],
		"header": [
			{
				"refresh_message": "Issued at  6:35 pm CST Wednesday 11 August 2010",
				"ID": "IDS60801",
				"main_ID": "IDS60800",
				"name": "Nonning",
				"state_time_zone": "SA",
				"time_zone": "CST",
				"product_name": "Weather Observations",
				"state": "South Australia"
			}
		],
		"data": [
			{
				"sort_order": 0,
				"wmo": 95655,
				"name": "Nonning",
				"history_product": "IDS60801",
				"local_date_time": "11/03:00pm",
				"local_date_time_full": "20100811150000",
				"air_temp": 15.5,
				"apparent_t": 12.2,
				"cloud": "Partly cloudy",
				"cloud_base_m": null,
				"cloud_oktas": 4,
				"cloud_type": "-",
				"cloud_type_id": 30,
				"delta_t": 4.5,
				"dewpt": 6.3,
				"gust_kmh": null,
				"gust_kt": null,
				"lat": -32.5,
				"lon": 136.5,
				"press_msl": null,
				"press_qnh": null,
				"press_tend": "-",
				"rain_trace": "0.0",
				"rel_hum": 54,
				"sea_state": "-",
				"swell_dir_worded": "-",
				"swell_height": "-",
				"swell_length": "-",
				"vis_km": "50",
				"weather": "Fine",
				"wind_dir": "SW",
				"wind_spd_kmh": 13,
				"wind_spd_kt": 7
			},
			{
				"sort_order": 1,
				"wmo": 95655,
				"name": "Nonning",
				"history_product": "IDS60801",
				"local_date_time": "11/09:00am",
				"local_date_time_full": "20100811090000",
				"air_temp": 9.5,
				"apparent_t": 7.8,
				"cloud": "Clear",
				"cloud_base_m": 2500,
				"cloud_oktas": 0,
				"cloud_type": "-",
				"cloud_type_id": null,
				"delta_t": 1.0,
				"dewpt": 7.4,
				"gust_kmh": null,
				"gust_kt": null,
				"lat": -32.5,
				"lon": 136.5,
				"press_msl": null,
				"press_qnh": null,
				"press_tend": "-",
				"rain_trace": "0.4",
				"rel_hum": 87,
				"sea_state": "-",
				"swell_dir_worded": "-",
				"swell_height": "-",
				"swell_length": "-",
				"vis_km": "40",
				"weather": "Fine",
				"wind_dir": "SW",
				"wind_spd_kmh": 6,
				"wind_spd_kt": 3
			},
			{
				"sort_order": 2,
				"wmo": 95655,
				"name": "Nonning",
				"history_product": "IDS60801",
				"local_date_time": "11/06:00am",
				"local_date_time_full": "20100811060000",
				"air_temp": 7.0,
				"apparent_t": 5.1,
				"cloud": "Clear",
				"cloud_base_m": 2500,
				"cloud_oktas": 0,
				"cloud_type": "-",
				"cloud_type_id": null,
				"delta_t": 1.0,
				"dewpt": 4.7,
				"gust_kmh": null,
				"gust_kt": null,
				"lat": -32.5,
				"lon": 136.5,
				"press_msl": null,
				"press_qnh": null,
				"press_tend": "-",
				"rain_trace": "-",
				"rel_hum": 85,
				"sea_state": "-",
				"swell_dir_worded": "-",
				"swell_height": "-",
				"swell_length": "-",
				"vis_km": "50",
				"weather": "Fine",
				"wind_dir": "SSW",
				"wind_spd_kmh": 4,
				"wind_spd_kt": 2
			},
			{
				"sort_order": 3,
				"wmo": 95655,
				"name": "Nonning",
				"history_product": "IDS60801",
				"local_date_time": "10/03:00pm",
				"local_date_time_full": "20100810150000",
				"air_temp": 12.0,
				"apparent_t": 10.4,
				"cloud": "Mostly cloudy",
				"cloud_base_m": null,
				"cloud_oktas": 7,
				"cloud_type": "-",
				"cloud_type_id": 30,
				"delta_t": 2.0,
				"dewpt": 7.9,
				"gust_kmh": null,
				"gust_kt": null,
				"lat": -32.5,
				"lon": 136.5,
				"press_msl": null,
				"press_qnh": null,
				"press_tend": "-",
				"rain_trace": "0.4",
				"rel_hum": 76,
				"sea_state": "-",
				"swell_dir_worded": "-",
				"swell_height": "-",
				"swell_length": "-",
				"vis_km": "40",
				"weather": "Fine",
				"wind_dir": "SSW",
				"wind_spd_kmh": 6,
				"wind_spd_kt": 3
			},
			{
				"sort_order": 4,
				"wmo": 95655,
				"name": "Nonning",
				"history_product": "IDS60801",
				"local_date_time": "10/09:00am",
				"local_date_time_full": "20100810090000",
				"air_temp": 8.0,
				"apparent_t": 6.9,
				"cloud": "Mostly cloudy",
				"cloud_base_m": null,
				"cloud_oktas": 7,
				"cloud_type": "-",
				"cloud_type_id": 30,
				"delta_t": 0.5,
				"dewpt": 6.9,
				"gust_kmh": null,
				"gust_kt": null,
				"lat": -32.5,
				"lon": 136.5,
				"press_msl": null,
				"press_qnh": null,
				"press_tend": "-",
				"rain_trace": "4.0",
				"rel_hum": 93,
				"sea_state": "-",
				"swell_dir_worded": "-",
				"swell_height": "-",
				"swell_length": "-",
				"vis_km": "50",
				"weather": "Fine",
				"wind_dir": "SW",
				"wind_spd_kmh": 2,
				"wind_spd_kt": 1
			},
			{
				"sort_order": 5,
				"wmo": 95655,
				"name": "Nonning",
				"history_product": "IDS60801",
				"local_date_time": "10/06:00am",
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