com.power.common.util.JsonFormatUtil Maven / Gradle / Ivy

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package com.power.common.util;

/**
 * @author yu
 */
public class JsonFormatUtil {

    /**
     * Format Json
     *
     * @param jsonStr json content
     * @return string
     */
    public static String formatJson(String jsonStr) {
        if (null == jsonStr || "".equals(jsonStr)) {
            return "";
        }
        StringBuilder sb = new StringBuilder();
        char last;
        char current = '\0';
        int indent = 0;
        for (int i = 0; i < jsonStr.length(); i++) {
            last = current;
            current = jsonStr.charAt(i);
            switch (current) {
                case '{':
                case '[':
                    sb.append(current);
                    sb.append('\n');
                    indent++;
                    addIndentBlank(sb, indent);
                    break;
                case '}':
                case ']':
                    sb.append('\n');
                    indent--;
                    addIndentBlank(sb, indent);
                    sb.append(current);
                    break;
                case ',':
                    sb.append(current);
                    if (last != '\\') {
                        sb.append('\n');
                        addIndentBlank(sb, indent);
                    }
                    break;
                case ':':
                    if (last != '\\') {
                        sb.append(current).append(" ");
                    } else {
                        sb.append(current);
                    }
                    break;
                default:
                    sb.append(current);
            }
        }

        return sb.toString();
    }

    /**
     * 添加空格
     *
     * @param sb
     * @param indent
     */
    private static void addIndentBlank(StringBuilder sb, int indent) {
        for (int i = 0; i < indent; i++) {
            sb.append('\t');
        }
    }
}