The method of splicing the string json

There are two methods for splicing json string,  

1. Direct brute splicing string

One should note that: 

(1)  in a key part of the string concatenation do not have extra spaces.

(2)  To "use \ to escape

(3)  the last value json array no comma, need to be addressed separately

String json = " { \" code\" :    200  ,"+ "\"data\" : [  ";
int i=0;
for (  i  = 0;  i < show.size() - 1 ;   i++  ) {
	String id = show.get(i).get("id");
	String name = show.get(i).get("name");
	String password = show.get(i).get("password");
	json +="{ \"id\" : \" "+ id + " \", ";
	json +="  \"name\"  : \""+ name  +"  \",   ";
	json +="  \"password\"  : \""+ password  +"  \"} ,  ";
}
	json +="{     \"id\" :\" " + show.get(i).get("id") +  "  \", ";
	json +="  \"name\"  :\" "+  show.get(i).get("name")  +" \",   ";
	json +="  \"password\"  : \""+  show.get(i).get("password")  +" \" }] }  ";

 2. Using the map key: value forms the string loop (this is convenient manner, can be abstracted as a tool);

String json = " { \" code\" :    200  ,"+ "\"data\" : [  ";
for (Map<String, String> map : show) {
	System.out.println(map.toString());
			
	json+= "{";
	for (String  key : map.keySet()) {
		json+="\""+key+"\":\""+map.get(key)+"\","  ;
	}
	json=json.substring(0,json.length()-1);
	json+="},";
}
json = json.substring(0,json.length()-1);
json+="]}";