我正在研究rfid，我正在从mysql数据库中的tableView中接收与我的rfid标签的UID相匹配的数据。 但是，当我点击另一个RFid标签时，以前的数据将被新的RFid标签覆盖。 但是我想要新数据在tableview的下一行中。 这是我的控制器代码：
public class detectController {
@FXML
private ResourceBundle resources;
@FXML
private URL location;
@FXML
private TableView<detectBean> tableView;
@FXML
private TextField txtSTID;
ObservableList<detectBean> list;
public static SerialPort s1;
static String temp="";
static String temp1="";
static void doAlert(String msg)
{
Alert alert=new Alert(AlertType.INFORMATION);
alert.setTitle("Alert..");
alert.setContentText(msg);
alert.show();
}
ObservableList<detectBean> getRecordsFromTableSome(String sID) throws FileNotFoundException
{
list=FXCollections.observableArrayList();
try {
pst=con.prepareStatement("select * from stuRegis where studentID=?");
pst.setString(1, sID);
ResultSet rs= pst.executeQuery();
while(rs.next())
{
String studentID=rs.getString("studentID");
String name=rs.getString("name");
String sroll=rs.getString("sroll");
String clas=rs.getString("clas");
String fname=rs.getString("fname");
String contact=rs.getString("contact");
String pic = rs.getString("pic");
FileInputStream photo=new FileInputStream(pic);
Image image1 = new Image(photo, 100, 100, false, false);
detectBean bean=new detectBean(studentID, name, sroll, clas, fname, contact, new ImageView(image1));
list.add(bean);
}
}
catch (SQLException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
return list;
}
/////////////////////////////////////////////////////
@FXML
void doFetch(ActionEvent event) throws IOException{
String a = recall();
txtSTID.setText(a);
ObservableList<detectBean> list=getRecordsFromTableSome(a);
tableView.setItems(list);
}
@FXML
void doComClose(ActionEvent event) {
if(s1.closePort()){
doAlert("Port Closed");
System.out.println("Port closed successFully");
}else{
doAlert("Failed to Close Port");
System.out.println("Failed to close port");
}
}
@FXML
void doOpenCom(ActionEvent event) {
port();
}
/////////////////////////////////////////////////////
public static void port()
{
SerialPort[] s=SerialPort.getCommPorts();
for(SerialPort port:s){
System.out.println(""+port.getSystemPortName());
s1=SerialPort.getCommPort(port.getSystemPortName());
if(s1.openPort()){
doAlert("Port Opened");
System.out.println("Port opened successFully ");
}else{
doAlert("Failed to Open Port");
System.out.println("Failed to open port");
}
}
s1.setBaudRate(9600);
}
public static String recall() throws IOException
{
InputStream is=s1.getInputStream();
StringBuilder st = new StringBuilder();
for(int i=0,x=0;true;i++){
//for (int i =0;i<11;i++){
st=st.append((char)is.read());
temp1=st.toString();
if(temp1.length()==13)
{ System.out.print(temp1);
//System.out.print(temp);
//System.out.print(temp1.length());
break;
}
System.out.print(temp1);
}
//System.out.print(""+(char)is.read());
temp=temp1.substring(0,11);
System.out.print(temp.length());
System.gc();
return temp;
}
//////////////////////////////////////////////////////
PreparedStatement pst;
Connection con;
@FXML
void initialize() throws IOException, FileNotFoundException {
con=MysqlConnection.doConnect();
TableColumn<detectBean, String> studentID=new TableColumn<detectBean, String>("Student ID");//Dikhava Title
studentID.setCellValueFactory(new PropertyValueFactory<>("studentID"));//bean field name
studentID.setMinWidth(90);
TableColumn<detectBean, String> name=new TableColumn<detectBean, String>("Name");//Dikhava Title
name.setCellValueFactory(new PropertyValueFactory<>("name"));//bean field name
TableColumn<detectBean, String> sroll=new TableColumn<detectBean, String>("Roll No.");//Dikhava Title
sroll.setCellValueFactory(new PropertyValueFactory<>("sroll"));//bean field name
TableColumn<detectBean, String> clas=new TableColumn<detectBean, String>("Class");//Dikhava Title
clas.setCellValueFactory(new PropertyValueFactory<>("clas"));//bean field name
TableColumn<detectBean, String> fname=new TableColumn<detectBean, String>("Father's Name");//Dikhava Title
fname.setCellValueFactory(new PropertyValueFactory<>("fname"));//bean field name
TableColumn<detectBean, String> contact=new TableColumn<detectBean, String>("Contact No.");//Dikhava Title
contact.setCellValueFactory(new PropertyValueFactory<>("contact"));//bean field name
contact.setMinWidth(90);
TableColumn<detectBean, Image> pic=new TableColumn<detectBean, Image>("Image");//Dikhava Title
pic.setCellValueFactory(new PropertyValueFactory<>("pic"));//bean field name
pic.setMinWidth(110);
tableView.getColumns().clear();
tableView.getColumns().addAll(studentID,name,sroll,clas,fname,contact,pic);
}
}
DetectBean：
public class detectBean {
String studentID;
String name;
String sroll;
String clas;
String fname;
String contact;
ImageView image;
public detectBean(String studentID, String name, String sroll, String clas, String fname, String contact, ImageView image) {
super();
this.studentID = studentID;
this.name = name;
this.sroll = sroll;
this.clas = clas;
this.fname = fname;
this.contact = contact;
this.image = image;
}
public String getsID() {
return studentID;
}
public void setsID(String studentID) {
this.studentID = studentID;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getSroll() {
return sroll;
}
public void setSroll(String sroll) {
this.sroll = sroll;
}
public String getClas() {
return clas;
}
public void setClas(String clas) {
this.clas = clas;
}
public String getFname() {
return fname;
}
public void setFname(String fname) {
this.fname = fname;
}
public String getContact() {
return contact;
}
public void setContact(String contact) {
this.contact = contact;
}
public ImageView getPic() {
return image;
}
public void setPic(String pic) {
this.image = image;
}
}
输出图片：
答案 0 :(得分：2)
我认为问题是：
tableView.setItems(list);
重置列表。
尝试：
tableview.getItems().addAll(list);
或者，仅在initialize方法中设置一个ObservableList，然后直接在查询中更改该列表。
public class detectController {
//....
@FXML
private TableView<detectBean> tableView;
ObservableList<detectBean> list;
///....
/////////////////////////////////////////////////////
@FXML
void doFetch(ActionEvent event) throws IOException{
String a = recall();
txtSTID.setText(a);
ObservableList<detectBean> list=getRecordsFromTableSome(a);
/// here!!!
// tableView.setItems(list);
tableView.getItems().addAll(list);
}