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 to obtain images from the network, to learn JAVA network connection operation, increasing the tips of the component to the container, set the window size and appearance to draw the image on the component to redraw the image to the last image is displayed