import java.io.*; import java.util.*; public class ReadProperties { public static void main(String[] args) throws IOException { if(args.length <= 0) { System.out.println("No file provided."); return; } File f = new File(args[0]); if(!f.exists()) { System.out.println("File not found: " + args[0]); return; } Properties prop = new Properties(); prop.load(new FileInputStream(f)); boolean isFirst = true; // I fucking hate java, why don't they have a native string join function? System.out.print("{"); for (Map.Entry item : prop.entrySet()) { String key = (String) item.getKey(); String value = (String) item.getValue(); if(isFirst) { isFirst = false; } else { System.out.print(","); } System.out.print("\"" + escape(key) + "\":\"" + escape(value) + "\""); } System.out.print("}"); } static String escape(String s) { // Taken from http://code.google.com/p/json-simple/ StringBuffer sb = new StringBuffer(); for(int i = 0; i < s.length(); i++) { char ch = s.charAt(i); switch(ch) { case '"': sb.append("\\\""); break; case '\\': sb.append("\\\\"); break; case '\b': sb.append("\\b"); break; case '\f': sb.append("\\f"); break; case '\n': sb.append("\\n"); break; case '\r': sb.append("\\r"); break; case '\t': sb.append("\\t"); break; case '/': sb.append("\\/"); break; default: //Reference: http://www.unicode.org/versions/Unicode5.1.0/ if (('\u0000' <= ch && ch <= '\u001F') || ('\u007F' <= ch && ch <= '\u009F') || ('\u2000' <= ch && ch <= '\u20FF')) { String ss = Integer.toHexString(ch); sb.append("\\u"); for(int k = ss.length(); k < 4; k++) { sb.append('0'); } sb.append(ss.toUpperCase()); } else { sb.append(ch); } } } return sb.toString(); } }