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如何解析json中map数据

2020-08-30 教育 131阅读
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.json.JSONArray;
import org.json.JSONObject;
import org.json.JSONStringer;
import org.json.JSONTokener;
import cc.util.android.core.LogUtil;
import android.util.Log;

/**
* 解析多层次Json字符串,封装多层Json，避免字符串中有特殊字符而出现的错误
* @author wangcccong
* @version 1.140122
* create at： Fri, 13 Jun 2014
* update at: Mon, 1 Sep 2014
*/
public class JsonUtil {

private final static String regex = "\"([^\\\" ]+?)\":";

/**
* 一个方法解析多层json数据 json + 正则 + 递归
* @see {@link java.util.regex.Matcher}, {@link java.util.regex.Pattern}
* @param jsonStr
* @return {@link java.util.Map} or {@link java.util.List} or {@link java.lang.String}
*/
public static Object jsonParse(final String jsonStr) {
if (jsonStr == null) throw new NullPointerException("JsonString shouldn't be null");
try {
if (isJsonObject(jsonStr)) {
final Pattern pattern = Pattern.compile(regex);
final Matcher matcher = pattern.matcher(jsonStr);
final Map map = new HashMap();
final JSONObject jsonObject = new JSONObject(jsonStr);
try {
for (; matcher.find(); ) {
String groupName = matcher.group(1);
Object obj = jsonObject.opt(groupName);
//Log.e(groupName, obj+"");
if (isJsonObject(obj+"") || isJsonArray(obj+"")) {
matcher.region(matcher.end() + (obj+"").replace("\\", "").length(), matcher.regionEnd());
map.put(groupName, jsonParse(obj+""));
} else {
map.put(groupName, obj+"");
}
}
} catch (Exception e) {
// TODO: handle exception
Log.e("object---error", e.getMessage()+"--"+e.getLocalizedMessage());
}

return map;
} else if (isJsonArray(jsonStr)) {
List list = new ArrayList();
try {
JSONArray jsonArray = new JSONArray(jsonStr);
for (int i = 0; i < jsonArray.length(); i++) {
Object object = jsonArray.opt(i);
list.add(jsonParse(object+""));
}
} catch (Exception e) {
// TODO: handle exception
Log.e("array---error", e.getMessage()+"--"+e.getLocalizedMessage());
}
return list;
}
} catch (Exception e) {
// TODO: handle exception
Log.e("RegexUtil--regexJson", e.getMessage()+"");
}
return jsonStr;
}

/**
* To determine whether a string is JsonObject {@link org.json.JSONObject}
* @param jsonStr {@link java.lang.String}
* @return boolean
*/
private static boolean isJsonObject(final String jsonStr) {
if (jsonStr == null) return false;
return Pattern.matches("^\\{.*\\}$", jsonStr.trim());
}

/**
* To determine whether a string is JsonArray {@link org.json.JSONArray};
* @param jsonStr {@link java.lang.String}
* @return boolean
*/
private static boolean isJsonArray(final String jsonStr) {
if (jsonStr == null) return false;
return Pattern.matches("^\\[.*\\]$", jsonStr.trim());
}

/**
* 将对象分装为json字符串 (json + 递归)
* @param obj 参数应为{@link java.util.Map} 或者 {@link java.util.List}
* @return
*/
@SuppressWarnings("unchecked")
public static www.hnnedu.com Object jsonEnclose(Object obj) {
try {
if (obj instanceof Map) { //如果是Map则转换为JsonObject
Map map = (Map)obj;
Iterator> iterator = map.entrySet().iterator();
JSONStringer jsonStringer = new JSONStringer().object();
while (iterator.hasNext()) {
Entry entry = iterator.next();
jsonStringer.key(entry.getKey()).value(jsonEnclose(entry.getValue()));
}
JSONObject jsonObject = new JSONObject(new JSONTokener(jsonStringer.endObject().toString()));
return jsonObject;
} else if (obj instanceof List) { //如果是List则转换为JsonArray
List list = (List)obj;
JSONStringer jsonStringer = new JSONStringer().array();
for (int i = 0; i < list.size(); i++) {
jsonStringer.value(jsonEnclose(list.get(i)));
}
JSONArray jsonArray = new JSONArray(new JSONTokener(jsonStringer.endArray().toString()));
return jsonArray;
} else {
return obj;
}
} catch (Exception e) {
// TODO: handle exception
LogUtil.e("jsonUtil--Enclose", e.getMessage());
return e.getMessage();
}
}

}
//解析时使用示例
Object object = JsonUtil.jsonParse(RegexPolicy.Json, jsonStr.substring(jsonStr.indexOf("{"),
jsonStr.lastIndexOf("}")+1));
if (object instanceof String) {
Log.e("string", object.toString());
} else if (object instanceof Map) {
@SuppressWarnings("unchecked")
HashMap map = (HashMap)object;
Iterator> iterator = map.entrySet().iterator();
while (iterator.hasNext()) {
Entry entry = iterator.next();
if (entry.getValue() instanceof List) {
Log.e(entry.getKey(), entry.getValue().toString());
} else {
Log.e(entry.getKey(), entry.getValue().toString());
}
}
} else if (object instanceof List) {
Log.e("list", object.toString());
}
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