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我有一个节点 js 服务器实现，我想向 Android (Java) 客户端发送一些值。node js服务器的方法如下：

app.get('/GetValues*', function (request, response) {
    // Request needs to be a GET
    if (request.method == 'GET') {

        var username = request.query.account;
        var time_now = Date.now();

        var db = database('./database.db'); 
        var row_account = db.prepare('SELECT SCORE score, STARTED_STUDY_SERVER_MILLIS timestamp, DAYS_TOTAL days_total FROM ACCOUNTS WHERE NAME = ?').get(username);

        var score = row_account.score;
        var days_total = row_account.days_total;
        var days_count = time_now - row_account.timestamp;
        var minutes_count = time_now - row_account.timestamp;

        var statement = db.prepare("UPDATE ACCOUNTS SET DAYS_COUNT = ?, MINUTES_COUNT = ? WHERE ID = ?");
        statement.run(days_count,minutes_count,getAccountID(db, request.query.account));

        var row_usage = db.prepare('SELECT DURATION_ENABLED duration_enabled, DURATION_DISABLED duration_disabled FROM USAGE WHERE NAME = ?').get(username);
        var duration_enabled = row_usage.duration_enabled;
        var duration_disabled = row_usage.duration_disabled;
    }
});

我想将值score(integer), days_total(integer), days_count(integer), minutes_count(long), duration_enabled (long), duration_disabled (long) 发送给客户端。

我怎样才能将它发送给客户？我认为 response.send() 只接受字符串。收到时如何解析 Java 中的值？

4

1 回答 1

2

由于您需要一次发送所有这些值，因此在这种情况下通常使用 JSON 进行响应。response.send()在 express 中，您可以使用或response.json()像这样发送 JSON 响应：

app.get('/GetValues*', function (request, response) {
  // ... your db operations here, then
  response.json({
    score: score,
    days_total: days_total,
    days_count: days_count,
    minutes_count: minutes_count,
    duration_enabled: duration_enabled,
    duration_disabled: duration_disabled
  });
});

这将在正文中发送一个响应Content-Type: application/json和一个 JSON 字符串，如下所示：

{"score":12,"days_total":12,"days_count":12,"minutes_count":12,"duration_enabled":12,"duration_disabled":12}

然后你只需在你的 Java 代码中解析它。

顺便说一句，这条线

if (request.method == 'GET') {

是不必要的。通过 , express 注册处理程序无论如何app.get()都只会处理请求。GET

于 2020-06-05T18:14:13.683 回答