我正在尝试使用google maps api来显示使用折线的用户路径。我从我创建的rest api获取json格式的坐标。 api工作正常，但地图没有显示路径。这是json格式
[{"user":"qwerty","latitude":28.648036,"longitude":77.2326533},{"user":"qwerty","latitude":28.646096,"longitude":77.183385},{"user":"qwerty","latitude":28.640015,"longitude":77.168119},{"user":"qwerty","latitude":28.644299,"longitude":77.162207}]
这是我用于地图的javascript代码
<script async defer
src="https://maps.googleapis.com/maps/api/js?callback=initMap"></script>
<script>
var username = "<%= session.getAttribute("Member").toString() %>";
var flightPlanCoordinates = [];
$(document).ready(function(){
$.ajax({
url: "http://127.0.0.1:8082/letstravel/location/"+username,
dataType: "json",
success: function(data) {
for(var i in data){
flightPlanCoordinates.push({ lat: data[i].latitude, lng: data[i].longitude });
}
}
});
});
function initMap() {
var map = new google.maps.Map(document.getElementById('map'), {
zoom: 3,
center: {lat: 0, lng: -180},
mapTypeId: google.maps.MapTypeId.TERRAIN
});
var flightPath = new google.maps.Polyline({
path: flightPlanCoordinates,
geodesic: true,
strokeColor: '#FF0000',
strokeOpacity: 1.0,
strokeWeight: 2
});
flightPath.setMap(map);
}
</script>
flightPlanCoordinates应采用以下格式：
flightPlanCoordinates = [
{lat: 37.772, lng: -122.214},
{lat: 21.291, lng: -157.821},
{lat: -18.142, lng: 178.431},
{lat: -27.467, lng: 153.027}
];
这似乎不起作用。我想我没有正确处理json。请帮忙。
答案 0 :(得分：2)
试试这种方式
public class A3Q1_40011419 {
//Creating the board for the user input
static char [][] board = {{'1','2','3'}, {'4','5','6'},{'7','8','9'}};
static Scanner keyboard = new Scanner (System.in);
//Keeping track of the turns
public static int turns = 0;
//Drawing the board
public static void drawBoard() {
int row = 0;
int col = 0;
int turn = 0;
for (row = 0; row < board.length; row++){
for (col = 0; col < board[row].length; col++){
System.out.print(board[row][col]);
System.out.print(" ");
}
System.out.println();
}
}
//Asking user for input
public static void getInput (int playerNum) {
char piece;
char location = ' ';
if (playerNum != 1){
System.out.println("Player X - Enter the position you wish to mark.");
location = keyboard.next().charAt(0);
piece = 'X';
}
else{
System.out.println("Player O - Enter the position you wish to mark.");
location = keyboard.next().charAt(0);
piece = 'O';
}
//------------------------
// Your new check
int locationInt = Integer.parseInt("" + location);
int x = (locationInt-1)/3;
int y = ((locationInt-1)%3);
if (board[x][y] == 'X' || board[x][y] == 'O'){
System.out.println("Position not available"); //This is was i tried to do so far to check is the position was available on the board. Not working
getInput(playerNum);
return;
}
//------------------------
if (location == '1')
if (board[0][0]=='1')
board[0][0] = piece;
else getInput(playerNum);
else if (location == '2')
if (board[0][1] == '2')
board[0][1] = piece;
else getInput(playerNum);
else if (location == '3')
if (board[0][2] == '3')
board[0][2] = piece;
else getInput(playerNum);
else if (location == '4')
if (board[1][0] == '4')
board[1][0] = piece;
else getInput(playerNum);
else if (location == '5')
if (board[1][1] == '5')
board[1][1] = piece;
else getInput(playerNum);
else if (location == '6')
if (board[1][2] == '6')
board[1][2] = piece;
else getInput(playerNum);
else if (location == '7')
if (board[2][0] == '7')
board[2][0] = piece;
else getInput(playerNum);
else if (location == '8')
if (board[2][1] == '8')
board[2][1] = piece;
else getInput(playerNum);
else if (location == '9')
if (board[2][2] == '9')
board[2][2] = piece;
else getInput(playerNum);
else if (location != '1' || location !='2' || location !='3' || location != '4' || location !='5' || location !='6' || location != '7' || location != '8'|| location !='9'){
System.out.println("That is not a valid position - must be between 1 and 9 inclusive.");
getInput(playerNum);
}
}
//Checking if position available
public static void isAvailable(){ //This is a method i thought of creating to check if the position was available but I have not used it yet.
char location_1 = ' ';
char location_2 = ' ';
char location_3 = ' ';
char location_4 = ' ';
char location_5 = ' ';
char location_6 = ' ';
char location_7 = ' ';
char location_8 = ' ';
char location_9 = ' ';
}
/*Checking if there is a winner by checking if the cells in the board are equal to each other
*and checking if the cell isn't empty. If one isn't empty and they're all equal, then
none of them is empty.*/
public static char isWinner() {
if (board[0][0] == board[1][1] && board[0][0] == board[2][2] && board[0][0]!='1')
return board[0][0];
else if (board[0][0] == board[1][0] && board[0][0] == board[2][0] && board[0][0]!='1')
return board[0][0];
else if (board[0][0]==board[0][1] && board[0][0]==board[0][2] && board[0][0]!='1')
return board[0][0];
else if (board[0][2] == board[1][1] && board[0][2] == board[2][0] && board[0][2] !='3')
return board[0][2];
else if (board[0][2] == board[1][2] && board[0][2] == board[2][2] && board[0][2] != '3')
return board[0][2];
else if (board[2][0] == board [2][1] && board[2][0] == board[2][2] && board[2][0] != '7')
return board[2][0];
else if (board[1][0] == board [1][1] && board[1][0] == board[1][2] && board[1][0] != '4')
return board[1][0];
else if (board[0][1] == board[1][1] && board[0][1] == board[2][1] && board[0][1] != '2')
return board[0][1];
else
return 'Y';
}
//New board for a new game
public static void newBoard() {
board[0][0] = '1';
board[0][1] = '2';
board[0][2] = '3';
board[1][0] = '4';
board[1][1] = '5';
board[1][2] = '6';
board[2][0] = '7';
board[2][1] = '8';
board[2][2] = '9';
}
//Main method
public static void main(String[] args) {
int game = 0;
int playerNum = 1;
String answer;
do {
turns = 0;
newBoard();
while (isWinner() == 'Y') {
drawBoard();
isWinner();
playerNum *= -1;
getInput(playerNum);
turns++;
System.out.println(turns);
if (turns == 9) {
break;
}
}
drawBoard();
if (isWinner() == 'X')
System.out.println("Player X wins");
else if (isWinner()=='O')
System.out.println("Player O wins");
else
System.out.println("It's a tie!");
System.out.println("Would you like to play another game?");
answer = keyboard.next().toLowerCase();
}
while (answer.equals("yes"));
}
}