pretty Format JSON - Java JSON

Java examples for JSON:JSON Data

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Description

pretty Format JSON

Demo Code


import java.net.URL;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.transaction.UserTransaction;

public class Main{
    public static String prettyFormatJSON(String jsonString) {
        int level = 0;
        boolean newline = false;
        StringBuilder builder = new StringBuilder();
        char p = '\0';
        for (char c : jsonString.toCharArray()) {
            if (newline
                    && (c != '}' && c != ']' && c != ',' && (c != '{' || p != '['))) {
                builder.append('\n');
                for (int i = 0; i < level; i++)
                    builder.append("  ");
                newline = false;/*from  ww w.ja  v  a 2  s  . c  o m*/
            }
            switch (c) {
            case '{':
            case '[':
                builder.append(c);
                level++;
                newline = true;
                break;
            case ',':
                builder.append(c);
                newline = true;
                break;
            case '}':
            case ']':
                level--;
                if (c != ']' || p != '}') {
                    builder.append('\n');
                    for (int i = 0; i < level; i++)
                        builder.append("  ");
                }
                builder.append(c);
                newline = true;
                break;
            default:
                builder.append(c);
                break;
            }
            p = c;
        }

        return builder.toString();
    }
}

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