我的mysql数据库中有图像，我希望接收图像，我可以在java中执行此操作但不能在javafx中执行此操作。
我正在使用此代码从数据库接收图像。
byte[] f51 = rs.getBytes(11);
现在我想在Image view中设置它。
我可以在 Java 中执行此操作，例如img.setIcon(new ImageIcon(f51));，但这不适用于 javafx
我使用了代码
private static Image convertToJavaFXImage(byte[] raw, final int width, final int height) {
WritableImage image = new WritableImage(width, height);
try {
ByteArrayInputStream bis = new ByteArrayInputStream(raw);
BufferedImage read = ImageIO.read(bis);
SwingFXUtils.toFXImage(read, image);
} catch (IOException ex) {
Logger.getLogger(App.class.getName()).log(Level.SEVERE, null, ex);
}
return image;
}
由@Patrick提供
现在它给出了错误：
Exception in thread "JavaFX Application Thread" java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1762)
at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1645)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
at javafx.event.Event.fireEvent(Event.java:198)
at javafx.scene.Scene$MouseHandler.process(Scene.java:3724)
at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3452)
at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1728)
at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2461)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:348)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:273)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:382)
at com.sun.glass.ui.View.handleMouseEvent(View.java:553)
at com.sun.glass.ui.View.notifyMouse(View.java:925)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$141(WinApplication.java:102)
at com.sun.glass.ui.win.WinApplication$$Lambda$37/584634336.run(Unknown Source)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)
at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)
at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1757)
... 30 more
Caused by: java.lang.NullPointerException
at javafx.embed.swing.SwingFXUtils.toFXImage(SwingFXUtils.java:85)
at stockmanagement1.RawmaterialAddController.convertToJavaFXImage(RawmaterialAddController.java:340)
at stockmanagement1.RawmaterialAddController.tabmrel(RawmaterialAddController.java:318)
... 40 more
请帮帮我。
更新
等等，我认为有一个令人困惑的是我发布了所有代码：添加：
@FXML
private void add(ActionEvent event) {
String mcode=txt1.getText();
String mname=txt2.getText();
String material=txt3.getText();
String quantity=txt4.getText();
String unit=(String) com1.getSelectionModel().getSelectedItem();
String priceper=txt5.getText();
String godown=(String) com2.getSelectionModel().getSelectedItem();
String desc=txtdexc.getText();
byte[] buf = null; byte[] person_image5=null;
try{
String df = img.getText();
File image=new File (df);
FileInputStream fis=new FileInputStream(image);
ByteArrayOutputStream bos= new ByteArrayOutputStream();
buf=new byte[1024];
for(int readnum;(readnum=fis.read(buf))!=-1; ){
bos.write(buf,0,readnum);
}
person_image5 = bos.toByteArray();
}
catch(Exception e){ }
try{
Connection con1=(Connection)DriverManager.getConnection("jdbc:mysql://localhost:3306/stockmanagement","root","root");
String sql1="INSERT INTO `rawmaterial`(`Name`, `Code`, `DOC`, `Material`, `godown`, `quantity`, `unit`, `cost`, `detail`, `pic`, `user`, `lastupdated`)"
+ " VALUES ('"+mname+"','"+mcode+"','2012-12-12','"+material+"','"+godown+"','"+quantity+"','"+unit+"','"+priceper+"','"+desc+"','"+person_image5+"','','')";
PreparedStatement stm1=(PreparedStatement) con1.prepareStatement(sql1);
stm1.executeUpdate(sql1);
tabdata();
}
catch(Exception e){
System.out.println(e.getMessage());
}
}
现在代码显示图片。
@FXML
void tabmrel(MouseEvent event) throws IOException {
int x0=table.getSelectionModel().getSelectedIndex();
String id=table.getItems().get(x0).getFirstName5();
try{
Class.forName("com.mysql.jdbc.Driver");
Connection con=(Connection)DriverManager.getConnection("jdbc:mysql://localhost:3306/stockmanagement","root","root");
String sql="Select * from rawmaterial where code='"+id+"'";
Statement stm=(Statement) con.createStatement();
ResultSet rs=stm.executeQuery(sql);
if(rs.next()){
txt1.setText(rs.getString(3));
txt2.setText(rs.getString(2));
txt3.setText(rs.getString(5));
txt4.setText(rs.getString(7));
byte[] f51=rs.getBytes(11);
System.out.println(f51);
ByteArrayInputStream bis = new ByteArrayInputStream(f51);
System.out.println(bis);
BufferedImage read = ImageIO.read(bis);
System.out.println(read);
Image image = SwingFXUtils.toFXImage(read, null);
imagego.setImage(image);
com1.getSelectionModel().select(rs.getString(8));
txt5.setText(rs.getString(9));
com1.getSelectionModel().select(rs.getString(6));
txtdexc.setText(rs.getString(10));
}
}
catch (ClassNotFoundException | SQLException e) {
}
}
帮帮我。
答案 0 :(得分：2)
Hej user3829658，
你可以尝试这种方法：
private static Image convertToJavaFXImage(byte[] raw, final int width, final int height) {
WritableImage image = new WritableImage(width, height);
try {
ByteArrayInputStream bis = new ByteArrayInputStream(raw);
BufferedImage read = ImageIO.read(bis);
image = SwingFXUtils.toFXImage(read, null);
} catch (IOException ex) {
Logger.getLogger(App.class.getName()).log(Level.SEVERE, null, ex);
}
return image;
}
<强>更新
一个完整的工作示例，唯一的区别是，我从SSD加载我的图像并从bytes[]方法获取Files.readAllBytes()。
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.logging.Level;
import java.util.logging.Logger;
import javafx.application.Application;
import javafx.embed.swing.SwingFXUtils;
import javafx.scene.Scene;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.image.WritableImage;
import javafx.scene.layout.AnchorPane;
import javafx.stage.Stage;
import javax.imageio.ImageIO;
public class App extends Application {
@Override
public void start(Stage primaryStage) throws FileNotFoundException, IOException {
AnchorPane root = new AnchorPane();
// replace this PATH_TO_YOUR_IMAGE
Path get = Paths.get("<PATH_TO_YOUR_IMAGE>");
byte[] readAllBytes = Files.readAllBytes(get);
Image convertToJavaFXImage = convertToJavaFXImage(readAllBytes, 1024, 768);
ImageView view = new ImageView(convertToJavaFXImage);
root.getChildren().add(view);
Scene scene = new Scene(root, 1024, 768);
primaryStage.setTitle("Hello World!");
primaryStage.setScene(scene);
primaryStage.show();
}
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
launch(args);
}
private static Image convertToJavaFXImage(byte[] raw, final int width, final int height) {
WritableImage image = new WritableImage(width, height);
try {
ByteArrayInputStream bis = new ByteArrayInputStream(raw);
BufferedImage read = ImageIO.read(bis);
image = SwingFXUtils.toFXImage(read, null);
} catch (IOException ex) {
Logger.getLogger(App.class.getName()).log(Level.SEVERE, null, ex);
}
return image;
}
}
帕特里克
答案 1 :(得分：0)
为我们剩下的人
有一种更简单的方法可以做到这一点...
String SQL = "SELECT File from SomeTable WHERE ID = ?"; PreparedStatement pstmt = conn.prepareStatement(SQL); pstmt.setInt(1, fileID); ResultSet rs = pstmt.executeQuery(); while (rs.next()) { InputStream imageFile = rs.getBinaryStream(1); Image image = new Image(imageFile); ImageView iv = new ImageView(image); }
一旦在ImageView对象中填充了图像，就可以根据自己的意愿设置其属性和方法。