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 dr