Java从网络取得图像，学习一下JAVA网络连接操作，增加组件到容器上，设置窗口尺寸和外观，在组件上绘制图像，重绘图像到最后显示图像等小技巧-Java image from the network, learn about JAVA network connection operations, increase component to the container, set the window size and appearance of the image is drawn on the c