struts2整合jfreechart1.0.14 中文显示有关问题

struts2整合jfreechart1.0.14 中文显示问题
由于毕业设计想用jfreechart1.0.14做报表统计，但是图片显示出来后中文无法正常显示，都变成了方框，而且我已经对字体进行了设置，求教各位网友....
Action部分代码：

Java code

HttpServletRequest request=ServletActionContext.getRequest();HttpSession session=request.getSession();CategoryDataset dataset = DatasetUtilities.createCategoryDataset(rowKeys, columnKeys, data);JFreeChart chart = ChartFactory.createBarChart3D(title,        x,        y,        dataset,        PlotOrientation.VERTICAL,        true,        true,        false); CategoryPlot plot = chart.getCategoryPlot();//设置字体，不然会中文乱码Font font = new Font("宋体", Font.BOLD, 16); TextTitle title1 = new TextTitle(title, font);chart.setTitle(title1); //标题        NumberAxis numberaxis = (NumberAxis) plot.getRangeAxis();CategoryAxis domainAxis = plot.getDomainAxis();  domainAxis.setTickLabelFont(new Font("sans-serif", Font.PLAIN, 11));     /*------设置X轴坐标上的文字-------*/ domainAxis.setLabelFont(new Font("宋体", Font.PLAIN, 12));       /*------设置X轴的标题文字------------*/  numberaxis.setTickLabelFont(new Font("sans-serif", Font.PLAIN, 12)); /*------设置Y轴坐标上的文字-----------*/  numberaxis.setLabelFont(new Font("黑体", Font.PLAIN, 12));      /*------设置Y轴的标题文字------------*/chart.getLegend().setItemFont(new Font("宋体", Font.PLAIN, 12));        

HTML code

<%@ page language="java" contentType="text/html;charset=UTF-8" pageEncoding="UTF-8"%>