一个自己编写的应用jfreechart生成piechart的类。注意在调用genPicture()之前首先要设置title,data,remoteAddr的值。genPicture()返回生成的图片的路径，可在前台页面中调用此图片显示chart。-an own applications written jfreechart generation piechart class. Calling attention to the genPicture () to be installed before the first title, data, remoteAddr value. GenPicture () returns generated pictures of trails the prospects call this page pictures chart.