io.github.whimthen.kits.json.MyJson Maven / Gradle / Ivy
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Easy to use java tool library.
package io.github.whimthen.kits.json;
import io.github.whimthen.kits.DateTimeKit;
import io.github.whimthen.kits.MapKit;
import io.github.whimthen.kits.ReflectKit;
import io.github.whimthen.kits.StringKit;
import io.github.whimthen.kits.log.Logger;
import java.lang.reflect.Array;
import java.lang.reflect.Field;
import java.math.BigDecimal;
import java.util.*;
/**
* @project: kits
* @created: with IDEA
* @author: nzlong
* @Date: 2019 01 24 10:13 | January. Thursday
*/
public class MyJson {
private final static String NULL = "null";
/**
* 将对象转换为json字符串
*
* @param object 资源对象
* @return 转换后的结果
*/
public static String toJSON(Object object) {
StringBuilder jsonString = new StringBuilder();
try {
if (Objects.isNull(object)) {
jsonString.append(NULL);
} else if (object instanceof BigDecimal) {
jsonString.append(((BigDecimal) object).toPlainString());
} else if (object instanceof Date) {
jsonString.append(DateTimeKit.formatToDefaultPattern((Date) object));
} else if (object instanceof Map) {
jsonString.append(MapKit.toJSON((Map) object));
} else if (object instanceof Collection) {
jsonString.append(collectionJson((Collection) object));
} else if (object.getClass().isArray()) {
Object[] arrayObject;
if (object.getClass().getComponentType().isPrimitive()) {
int length = Array.getLength(object);
arrayObject = new Object[length];
for (int i = 0; i < length; ++i) {
arrayObject[i] = Array.get(object, i);
}
} else {
arrayObject = (Object[]) object;
}
jsonString.append(arrayJson(arrayObject));
} else if (object instanceof Integer || object instanceof Double || object instanceof Float || object instanceof Boolean || object instanceof Long || object instanceof Short) {
jsonString.append(object);
} else if (object instanceof String || object instanceof StringBuilder) {
jsonString.append(object.toString());
} else if (object instanceof Class) {
jsonString.append(((Class) object).getName());
} else {
jsonString.append("{").append(complexObject(object)).append("}");
}
} catch (Exception ex) {
Logger.errorf("JSON formart error", ex);
}
return jsonString.toString();
}
/**
* 将对象属性转换为json
*
* @param object 对象
* @return 转换后的结果
* @throws IllegalAccessException 处理异常
*/
private static String complexObject(Object object) throws IllegalAccessException {
if (Objects.isNull(object)) {
return NULL;
}
StringBuilder json = new StringBuilder();
List fields = ReflectKit.getFields(object.getClass());
for (Field field : fields) {
field.setAccessible(true);
Class type = field.getType();
if (Objects.nonNull(type)) {
String name = field.getName();
Object value = field.get(object);
json.append("\"").append(name).append("\": ");
if (BigDecimal.class.isAssignableFrom(type) || Integer.class.isAssignableFrom(type) || int.class == type || Double.class.isAssignableFrom(type) || double.class == type || Float.class.isAssignableFrom(type) || float.class == type
|| Long.class.isAssignableFrom(type) || long.class == type || Short.class.isAssignableFrom(type) || short.class == type || Boolean.class.isAssignableFrom(type) || boolean.class == type) {
json.append(value);
} else if (Date.class == type || String.class == type || Byte.class == type || byte.class == type || char.class == type || Character.class == type) {
if (value == null) {
json.append(NULL);
} else {
json.append("\"").append(value).append("\"");
}
} else if (Map.class.isAssignableFrom(type)) {
json.append(MapKit.toJSON((Map) value));
} else if (Collection.class.isAssignableFrom(type)) {
json.append(Objects.isNull(value) ? NULL : collectionJson((Collection) value));
} else if (type.isArray()) {
json.append(arrayJson((Object[]) value));
} else {
String obj = complexObject(value);
if (StringKit.isNullOrEmpty(obj) || obj.equals(NULL)) {
json.append(obj);
} else {
json.append("{").append(obj).append("}");
}
}
json.append(", ");
}
}
return json.deleteCharAt(json.lastIndexOf(",")).deleteCharAt(json.lastIndexOf(" ")).toString();
}
/**
* 将集合转换为json
*
* @param collection 任意集合对象
* @return 转换后的结果
*/
private static String collectionJson(Collection collection) {
return arrayJson(collection.toArray());
}
/**
* 将数组转换为json
*
* @param objects 任意数组
* @return 转换后的结果
*/
private static String arrayJson(Object[] objects) {
if (objects == null || objects.length <= 0) {
return NULL;
}
StringBuilder jsonString = new StringBuilder("[");
for (Object object : objects) {
if (object instanceof Collection || object.getClass().isArray()) {
jsonString.append(arrayJson((Object[]) object));
} else if (object instanceof String || object instanceof Date || object instanceof Boolean) {
jsonString.append("\"").append(toJSON(object)).append("\"").append(", ");
} else {
jsonString.append(toJSON(object)).append(", ");
}
}
return jsonString.deleteCharAt(jsonString.lastIndexOf(",")).deleteCharAt(jsonString.lastIndexOf(" ")).append("]").toString();
}
/**
* 格式化Json字符串
*
* @param jsonStr
* @return
*/
public static String prettyJson(String jsonStr) {
if (StringKit.isNullOrEmpty(jsonStr)) {
return null;
}
StringBuilder prettyJson = new StringBuilder();
if (jsonStr.startsWith("{")) {
prettyJson.append(prettyObj(jsonStr, 1));
} else if (jsonStr.startsWith("[")) {
prettyJson.append(prettyArr(jsonStr, 1));
} else {
prettyJson.append(jsonStr);
}
return prettyJson.toString();
}
/**
* 格式化对象Json
*
* @param json Json字符串
* @param indentCount 缩进
* @return 格式化后的字符串
*/
private static String prettyObj(String json, int indentCount) {
StringBuilder jsonStr = new StringBuilder();
if (StringKit.isNotNullOrEmpty(json)) {
jsonStr.append(json.charAt(0));
json = json.substring(1).trim();
int mCount = 1;
char lastEffective = '#';
for (; StringKit.isNotNullOrEmpty(json) ;) {
char jsonCh = json.charAt(0);
json = json.substring(1);
if ((jsonCh == ' ' && lastEffective == ',')) {
continue;
}
switch (jsonCh) {
case '\"':
if (mCount % 2 != 0 && lastEffective != ':') {
jsonStr.append("\n").append(StringKit.repeat("\t", indentCount)).append(jsonCh);
} else {
jsonStr.append(jsonCh);
}
mCount++;
break;
case ':':
jsonStr.append(jsonCh).append((lastEffective == '\"' && json.length() > 1 && json.charAt(0) != ' ') ? ' ' : "");
break;
case '[':
String substring = json.substring(0, json.indexOf(']') + 1);
Logger.debugf("subString = {}", substring);
jsonStr.append(prettyJson('[' + substring));
json = json.substring(json.indexOf(']') + 1);
break;
case '{':
String obj = json.substring(0, json.indexOf("}") + 1);
json = json.substring(json.indexOf("}") + 1);
int charCount = StringKit.getCharCount(obj, '{');
for (int i = 0; i < charCount; i++) {
obj += json.substring(0, json.indexOf("}") + 1);
json = json.substring(json.indexOf("}") + 1);
}
int leftCount = 0, rightCount = 0;
String jsonArr = null, oldObj = null;
boolean isArr = false;
if (obj.contains("[")) {
isArr = true;
oldObj = obj;
leftCount = StringKit.getCharCount(obj, '[');
rightCount = StringKit.getCharCount(obj, ']');
jsonArr = obj.substring(obj.indexOf("["));
obj = obj.substring(0, obj.indexOf("["));
}
Logger.debugf("obj = {}", obj);
jsonStr.append(prettyObj('{' + obj, indentCount + 1));
if (isArr && StringKit.isNotNullOrEmpty(jsonArr)) {
if (leftCount > rightCount) {
for (int i = 0; i < leftCount - rightCount; i++) {
jsonArr += json.substring(json.indexOf("]") + 1);
json = json.substring(json.indexOf("]") + 1);
}
} else {
jsonArr = oldObj.substring(oldObj.indexOf("["), oldObj.indexOf("]") + 1);
json = oldObj.substring(oldObj.indexOf("]") + 1) + json;
}
Logger.debugf("josn = {}", json);
jsonStr.append(prettyArr(jsonArr, indentCount + 1));
}
break;
case '}':
jsonStr.append("\n").append(indentCount - 1 == 0 ? "" : StringKit.repeat("\t", indentCount - 1)).append(jsonCh);
break;
default:
jsonStr.append(jsonCh);
break;
}
if (jsonCh != ' ') {
lastEffective = jsonCh;
}
}
}
return jsonStr.toString();
}
private static String prettyArr(String resource, int indentCount) {
if (StringKit.isNullOrEmpty(resource)) {
return "";
}
StringBuilder prettyJson = new StringBuilder();
for (char ch : resource.toCharArray()) {
switch (ch) {
case '[':
prettyJson.append(ch).append("\n").append(StringKit.repeat("\t", indentCount + 1));
break;
case '{':
String jsonObj = resource.substring(resource.indexOf("{"), resource.indexOf("}") + 1);
resource = resource.substring(resource.indexOf("}") + 1);
Logger.debugf("jsonObj = {}", jsonObj);
Logger.debugf("resource = {}", resource);
prettyJson.append(prettyObj(jsonObj, indentCount + 1));
break;
// case '\"':
// break;
default:
prettyJson.append(ch);
break;
}
}
return prettyJson.toString();
}
}