Question

在Java中，有没有办法获得不是.jpeg，.gif，.bmp或.png的文件的BufferedImage？更具体地说，我希望能够创建一个BufferedImage .jpg。我知道的唯一方法是ImageIO.read，如果文件不是任何这些类型，它将返回null。有没有其他方法可以制作BufferedImage？目前我的代码如下所示：

private void sendImage(BufferedImage image){

    try{
        if(output == null){

            showMessage("MAKE SURE THAT YOU ARE CONNECTED TO SOMEONE!\n");

        }

        else{

            if(image == null)System.out.println("image is null in sendImage");

            output.writeObject("CODE - 4");
            output.flush();
            System.out.println("here");
            output.writeObject(image);
            System.out.println("done");
            output.flush();
            System.out.println("Just sent code " + 4);

        }

    }catch(IOException ioException){

        System.out.println("\nERROR! UNABLE TO SEND IMAGE CODE!");
        ioException.printStackTrace();

    }

堆栈跟踪如下所示：

java.io.NotSerializableException: java.awt.image.BufferedImage
    at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1183)
    at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
    at server.Server.sendImage(Server.java:432)
    at server.Server.access$300(Server.java:32)
    at server.Server$2.actionPerformed(Server.java:95)
    at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
    at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)
    at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
    at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
    at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
    at java.awt.Component.processMouseEvent(Component.java:6516)
    at javax.swing.JComponent.processMouseEvent(JComponent.java:3321)
    at java.awt.Component.processEvent(Component.java:6281)
    at java.awt.Container.processEvent(Container.java:2229)
    at java.awt.Component.dispatchEventImpl(Component.java:4872)
    at java.awt.Container.dispatchEventImpl(Container.java:2287)
    at java.awt.Component.dispatchEvent(Component.java:4698)
    at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832)
    at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492)
    at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)
    at java.awt.Container.dispatchEventImpl(Container.java:2273)
    at java.awt.Window.dispatchEventImpl(Window.java:2719)
    at java.awt.Component.dispatchEvent(Component.java:4698)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:747)
    at java.awt.EventQueue.access$300(EventQueue.java:103)
    at java.awt.EventQueue$3.run(EventQueue.java:706)
    at java.awt.EventQueue$3.run(EventQueue.java:704)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
    at java.awt.EventQueue$4.run(EventQueue.java:720)
    at java.awt.EventQueue$4.run(EventQueue.java:718)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:717)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)

是的，程序输出“here”然后与上面的堆栈跟踪崩溃。如果没有以不同的格式获得它，是否有替代品可以来自任何格式的图像（对于超级奖励点，也可以是可序列化的）。

Answer 1

Java中最常见的图像读者/编写者是：

javax.imageio，特别是如果你添加了Twelve Monkeys项目罐。
Java Advanced Imaging，但有时似乎有内存泄漏。
BioFormat，专注于所有显微镜格式，但也是常规格式。

使用imageio和JAI，您可以读取/写入jpg图像。

Answer 2

我认为您不希望将图像直接写入流中。你想要的是ImageIO.write，像这样：

<string name="google_app_id">YOUR_PROJECT_NUMBER</string>

上面的代码会将您的缓冲图像写为png。如果你想要一个jpeg，这应该有效：

import javax.imageio.ImageIO;
.
.
.
.
ImageIO.write(image, "png", output);

如何获取不是.jpeg，.gif，.bmp或.png的文件的BufferedImage

2 个答案: