Java String Format formatJson(String json)

Description

format Json

License

Apache License

Declaration

public static String formatJson(String json) 

Method Source Code

//package com.java2s;
//License from project: Apache License 

import java.util.ArrayList;

public class Main {

    public static String formatJson(String json) {
        if (json == null || json.trim().length() == 0) {
            return null;
        }/*  w  w  w . j  a va2 s. c  o  m*/
        int fixedLenth = 0;
        ArrayList<String> tokenList = new ArrayList<String>();
        {
            String jsonTemp = json;
            while (jsonTemp.length() > 0) {
                String token = getToken(jsonTemp);
                jsonTemp = jsonTemp.substring(token.length());
                token = token.trim();
                tokenList.add(token);
            }
        }

        for (int i = 0; i < tokenList.size(); i++) {
            String token = tokenList.get(i);
            int length = token.getBytes().length;
            if (length > fixedLenth && i < tokenList.size() - 1 && tokenList.get(i + 1).equals(":")) {
                fixedLenth = length;
            }
        }

        StringBuilder buf = new StringBuilder();
        int count = 0;
        for (int i = 0; i < tokenList.size(); i++) {

            String token = tokenList.get(i);

            if (token.equals(",")) {
                buf.append(token);
                doFill(buf, count);
                continue;
            }
            if (token.equals(":")) {
                buf.append(token);
                continue;
            }
            if (token.equals("{")) {
                String nextToken = tokenList.get(i + 1);
                if (nextToken.equals("}")) {
                    i++;
                    buf.append("{ }");
                } else {
                    count++;
                    buf.append(token);
                    doFill(buf, count);
                }
                continue;
            }
            if (token.equals("}")) {
                count--;
                doFill(buf, count);
                buf.append(token);
                continue;
            }
            if (token.equals("[")) {
                String nextToken = tokenList.get(i + 1);
                if (nextToken.equals("]")) {
                    i++;
                    buf.append("[ ]");
                } else {
                    count++;
                    buf.append(token);
                    doFill(buf, count);
                }
                continue;
            }
            if (token.equals("]")) {
                count--;
                doFill(buf, count);
                buf.append(token);
                continue;
            }

            buf.append(token);
        }
        return buf.toString();
    }

    /**
     * @param json
     * @return
     */
    private static String getToken(String json) {
        StringBuilder buf = new StringBuilder();
        boolean isInYinHao = false;
        while (json.length() > 0) {
            String token = json.substring(0, 1);
            System.err.println(token);
            json = json.substring(1);
            System.err.println(json);

            if (!isInYinHao && (token.equals(":") || token.equals("{") || token.equals("}") || token.equals("[")
                    || token.equals("]") || token.equals(","))) {
                if (buf.toString().trim().length() == 0) {
                    buf.append(token);
                }
                break;
            }
            if (token.equals("\\")) {
                buf.append(token);
                buf.append(json.substring(0, 1));
                json = json.substring(1);
                continue;
            }
            if (token.equals("\"")) {
                buf.append(token);
                if (isInYinHao) {
                    break;
                } else {
                    isInYinHao = true;
                    continue;
                }
            }
            buf.append(token);
        }
        return buf.toString();
    }

    private static void doFill(StringBuilder buf, int count) {
        buf.append("\n");
    }
}

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