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我需要从数据库(MySQL)读取数据并传输到客户端。客户端 - 服务器。如何转移到客户端,一个自定义类?
我可以以某种方式将TopickOfVote
类型的对象转移到客户端或仅通过字符串? 作者与读者:
writer = new PrintWriter(new OutputStreamWriter(clientAPP.getWriter()));
reader = new BufferedReader(new InputStreamReader(clientAPP.getReader()));
服务器:
private void LoadOfTopics() throws SQLException {
resultSet = statement.executeQuery("SELECT * FROM kursach.TopicOfVote");
StringBuffer id;
StringBuffer topic;
while(resultSet.next()){
TopicOfVote topicOfVote = new TopicOfVote();
topicOfVote.setId(Integer.parseInt(resultSet.getString("idVote")));
topicOfVote.setTopic(resultSet.getString("topic"));
ResultSet ans = statement.executeQuery("SELECT * FROM kursach.Answers_vote WHERE idVote=" + topicOfVote.getId());
ArrayList<Answer> answers = new ArrayList<>();
while (ans.next()){
Answer answer = new Answer();
answer.setId(Integer.parseInt(ans.getString("idAnswer")));
answer.setAnswer(ans.getString("answer"));
answer.setIdOfTopic(Integer.parseInt(ans.getString("idVote")));
answers.add(answer);
}
topicOfVote.setAnswers(answers);
writer.println(topicOfVote); // ???
writer.flush();
ans.close();
}
}
客户:
private void createPanelTopics(){
try {
writer.println(HandlerQueries.GET_VOTES + "?");
writer.flush();
reader.readLine();//?????
} catch (IOException e) {
e.printStackTrace();
}
}
从被你得到'writer'和'reader'?如果您必须使用它们,那么您需要使用文本序列化(例如,可以使用JSON)。如果你有'InputStream'并且可以创建'TopicOfVote'' Serializable',那么你可以使用'ObjectInputStream'和''ObjectOutputStream''。 – Oleg
谢谢!奇怪。但是,之前,它不适用于'ObjectInputStream'和'ObjectOutputStream' –
'它没有工作'不是一个问题描述。如果这就是你想问的问题,请正确地问。 – EJP