将JPanel Graphics导出为.png或.gif或.jpg [英] Export JPanel Graphics to .png or .gif or .jpg

问题描述

我有一个位于JPanel内的JComponent。

我已经可以在该JComponent中绘制线条和矩形。

现在，如何将此图形导出为图像（png，gif， jpg）？

我尝试过：

  BufferedImage b = new的BufferedImage（1700,1100，BufferedImage.TYPE_INT_RGB）; 
 this.print（getGraphics（））; 
 try {ImageIO.write（b，png，new File（test.png））;} catch（Exception e）{} 
  

但是，这只能创建一个全黑的.png文件。

帮助!!!

RESOLVED !!!

  BufferedImage bi = new BufferedImage this.getSize（）。width，this.getSize（）。height，BufferedImage.TYPE_INT_ARGB）; 
图形g = bi.createGraphics（）; 
 this.paint（g）; // this == JComponent 
 g.dispose（）; 
 try {ImageIO.write（bi，png，new File（test.png））;} catch（Exception e）{} 
  

解决方案

首先， print（）是不正确的方法。
我猜应该工作（尚未测试）是：
获取 BufferedImage 的图形（ b .createGraphics（）），并将该图形对象用于面板/组件 paint（）



（例如 yourPanel.paint（b.createGraphics（））; ）

I'm trying to develop some sort of paint using Java.

I have a JComponent that is located inside of a JPanel.

I already can draw lines and rectangles into that JComponent.

Now, how can I export this drawings as an image (png, gif, jpg)?

I tried this:

BufferedImage b = new BufferedImage(1700,1100,BufferedImage.TYPE_INT_RGB);
this.print(getGraphics());
try{ImageIO.write(b,"png",new File("test.png"));}catch (Exception e) {}

But that only creates a .png file all black.

Help!!!

RESOLVED!!!

BufferedImage bi = new BufferedImage(this.getSize().width, this.getSize().height, BufferedImage.TYPE_INT_ARGB); 
Graphics g = bi.createGraphics();
this.paint(g);  //this == JComponent
g.dispose();
try{ImageIO.write(bi,"png",new File("test.png"));}catch (Exception e) {}

解决方案

First of all, print() is the incorrect method. What I guess should work (haven't tested it yet) is: get the BufferedImage's Graphics (b.createGraphics()) and use that graphics object to paint() your panel/component.

(e.g. yourPanel.paint(b.createGraphics());)

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