Here you can find the source of quote(String string, boolean escapeHtml)
public static String quote(String string, boolean escapeHtml)
//package com.java2s; //License from project: Apache License public class Main { public static String quote(String string, boolean escapeHtml) { int length = string.length(); if (string == null || length == 0) { return "\"\""; }// w ww . j a va 2 s .c o m if (length > 1) { if (quoted(string)) { return string; } if (parenthesized(string)) { return string; } } char c = 0; int i; int len = string.length(); StringBuilder sb = new StringBuilder(len + 10); String t; sb.append('"'); for (i = 0; i < len; i += 1) { c = string.charAt(i); switch (c) { case '\\': case '"': sb.append('\\'); sb.append(c); break; // case '/': // if (b == '<') { // sb.append('\\'); // } // sb.append(c); // break; case '\b': sb.append("\\b"); break; case '\t': sb.append("\\t"); break; case '\n': sb.append("\\\\n"); break; case '\f': sb.append("\\f"); break; case '\r': sb.append("\\\\r"); break; case ',': sb.append(","); break; case '<': if (escapeHtml) { sb.append("\\u003c"); } else { sb.append(c); } break; case '>': if (escapeHtml) { sb.append("\\u003e"); } else { sb.append(c); } break; case '=': if (escapeHtml) { sb.append("\\u003d"); } else { sb.append(c); } break; case '&': if (escapeHtml) { sb.append("\\u0026"); } else { sb.append(c); } break; case '\'': if (escapeHtml) { sb.append("\\u0027"); } else { sb.append(c); } break; default: if (c < ' ') { t = "000" + Integer.toHexString(c); sb.append("\\u" + t.substring(t.length() - 4)); } else { sb.append(c); } } } sb.append('"'); return sb.toString(); } public static boolean quoted(String str) { if (str.startsWith("\"") && str.endsWith("\"")) { return true; } if (str.startsWith("'") && str.endsWith("'")) { return true; } return false; } public static boolean parenthesized(String str) { if (isArrayOrList(str)) { return true; } if (isObjectOrMap(str)) { return true; } return false; } public static boolean isArrayOrList(String str) { if (str == null) { return false; } if (str.startsWith("[") && str.endsWith("]")) { return true; } return false; } public static boolean isObjectOrMap(String str) { if (str == null) { return false; } if (str.startsWith("{") && str.endsWith("}")) { return true; } return false; } }