import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import com.jfinal.kit.JsonKit; public class JsonToJavaObject {  public static void main(String[] args) {   Object o1 = parse("{\"aa\":123,cc:[1,2,3,4,{cd:f,bb:234}]}");   System.out.println(JsonKit.toJson(o1));  }  public static Object parse(String json){   if(json == null){    return null;   }   json = json.trim();   if("string".equals(typeof(json))){    return json;   }   if("map".equals(typeof(json))){    return parseMap(json);   }   if("list".equals(typeof(json))){    return parseList(json);   }   return null;  }  public static Map parseMap(String json){   if(!"map".equals(typeof(json))){    throw new RuntimeException("json 不是Map类型");   }   Map r = new HashMap();   parseToken(r,json,null);   return r;  }  public static List parseList(String json){   if(!"list".equals(typeof(json))){    throw new RuntimeException("json 不是list类型");   }   List r = new ArrayList();   parseToken(null, json, r);   return r;  }  public static String typeof(String json){   if(json.length() == 0)return "string";   if('{'==json.charAt(0)){    if('}' == json.charAt(json.length()-1)){     return "map";    }   }   if('['==json.charAt(0)){    if(']'==json.charAt(json.length()-1)){     return "list";    }   }   return "string";  }  private static void parseToken(Map r, String json,List r2) {   boolean syh = true; //双引号   boolean dyh = true;//单引号   boolean dkh = true;//大括号   boolean zkh = true;//中括号   boolean isKey = true;   StringBuffer key = new StringBuffer();   StringBuffer value = new StringBuffer();   for(int i=1;i<json.length()-1;i++){    char item = json.charAt(i);    if(dyh&&syh&&zkh)if('{' == item || '}' == item){     dkh = !dkh;    }    if(dyh&&syh&&dkh)if('[' == item || ']' == item){     zkh = !zkh;    }    if(dyh&&dkh&&zkh)if('"' == item){     syh = !syh;     continue;    }    if(syh&&dkh&&zkh)if(syh)if('\'' == item){     dyh = !dyh;     continue;    }    if(dyh&&syh&&dkh&&zkh)if(r2==null)if(dyh)if(':'==item){     isKey = false;     continue;    }    if(dyh&&syh&&dkh&&zkh)if(','==item){     isKey = true;     if(r != null){      r.put(key.toString(), parse(value.toString()));     }     if(r2 != null){      r2.add(parse(key.toString()));     }     key = new StringBuffer();     value = new StringBuffer();     continue;    }    if(isKey){     key.append(item);    }else{     value.append(item);    }   }   if(!key.toString().trim().equals("")){    if(r != null){     if(value.toString().trim().equals(""))throw new RuntimeException("json 格式错误");     r.put(key.toString(), parse(value.toString()));    }    if(r2 != null){     r2.add(parse(key.toString()));    }   }  } }

{"aa":"123","cc":["1","2","3","4",{"bb":"234","cd":"f"}]}