/**
 *
 * 格式化核心邏輯來源於JSON格式化 @link {http://www.bejson.com/}
 * @author joker.yyc
 */
public class JsonFormatUtils {

    /**
     * 對json字串進行格式化
     * @param content 要格式化的json字串
     * @param indent 是否進行縮排(false時壓縮為一行)
     * @param colonWithSpace key冒號後是否加入空格
     * @return
     */
    public static String toFormat
 
(String content, boolean indent, boolean colonWithSpace) {
        if (content == null) return null;
        StringBuilder sb = new StringBuilder();
        int count = 0;
        boolean inString = false;
        String tab = "\t";
        for (int i = 0; i < content.length(); i ++) {
            char
 
 ch = content.charAt(i);
            switch (ch) {
                case '{':
                case '[':
                    sb.append(ch);
                    if (!inString) {
                        if (indent) {
                            sb.append("\n");
                            count ++;
                            for
 
 (int j = 0; j < count; j ++) {
                                sb.append(tab);
                            }
                        }

                    }
                    break;
                case '\uFEFF': //非法字元
                    if (inString) sb.append(ch);
                    break;
                case '}':
                case ']':
                    if (!inString) {
                        if (indent) {
                            count --;
                            sb.append("\n");
                            for (int j = 0; j < count; j ++) {
                                sb.append(tab);
                            }
                        }

                        sb.append(ch);
                    } else {
                        sb.append(ch);
                    }
                    break;
                case ',':
                    sb.append(ch);
                    if (!inString) {
                        if (indent) {
                            sb.append("\n");
                            for (int j = 0; j < count; j ++) {
                                sb.append(tab);
                            }
                        } else {
                            if (colonWithSpace) {
                                sb.append(' ');
                            }
                        }
                    }
                    break;
                case ':':
                    sb.append(ch);

                    if (!inString) {
                        if (colonWithSpace) {  //key名稱冒號後加空格
                            sb.append(' ');
                        }
                    }
                    break;
                case ' ':
                case '\n':
                case '\t':
                    if (inString) {
                        sb.append(ch);
                    }
                    break;
                case '"':
                    if (i > 0 && content.charAt(i - 1) != '\\') {
                        inString = !inString;
                    }
                    sb.append(ch);
                    break;
                default:
                    sb.append(ch);
                    break;
            }
        }
        return sb.toString();
    }

    public static void main(String[] args) {
        String str = "{\"name\": \"張 三 \", \"remark\": \",: {}[]啦啦啦\", \"data\": [\"1\", \"2\"]}";
        System.out.println(toFormat(str, false, true));
        System.out.println(toFormat(str, false, false));
        System.out.println(toFormat(str, true, false));
        System.out.println(toFormat(str, true, true));
    }
}

main方法執行結果如下

{"name": "張 三 ", "remark": ",: {}[]啦啦啦", "data": ["1", "2"]}
{"name":"張 三 ","remark":",: {}[]啦啦啦","data":["1","2"]}
{
    "name":"張 三 ",
    "remark":",: {}[]啦啦啦",
    "data":[
        "1",
        "2"
    ]
}
{
    "name": "張 三 ",
    "remark": ",: {}[]啦啦啦",
    "data": [
        "1",
        "2"
    ]
}