java中怎么生成表格图表

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项目有个需求是生成上图的表格图表，本来excel很容易生成上边的表格图，但是java poi不支持在服务器端把excel表格导出成图片，在没有找到合适的工具库下，用java 2d实现同样图表。
这个表格图分成标题、表头、表中、表尾4个部分，
背景填充用:graphics.fillRect()
画线条用:graphics.drawLine()
画文字用:graphics.drawString()
主要用上边三个java 2d方法实现，剩下的就是各种坐标位置的计算。
实现代码：

package com.penngo.test;import javax.imageio.ImageIO;import java.awt.*;import java.awt.image.BufferedImage;import java.io.File;import java.util.Arrays;import java.util.List;public class ExcelChart {    private Font titleFont = new Font("宋体",Font.BOLD,20);    private Font headFont = new Font("宋体",Font.BOLD,16);    private Font rowFont = new Font("宋体",Font.PLAIN,14);    private Font bottomFont = new Font("宋体",Font.PLAIN,14);    private Color titleBackgroup = new Color(237, 125, 49);  // 标题背景色    private Color headBackgroup = new Color(252, 228, 214);  // 表头背景色    private Color lineColor = new Color(237, 125,49);        // 线条颜色    private int titleMargin = 8;    private int headMargin = 8;    private int rowMargin = 5;    private int bottomMargin = 5;    private int width;    private int height;    private int widthMargin = 10;   // x横轴边距    private int heightMargin = 10;  // y轴边框    /**     * 将图片保存到指定位置     * @param image 缓冲文件类     * @param fileLocation 文件位置     */    public void createImage(BufferedImage image, File fileLocation) {        try {            ImageIO.write(image, "png", fileLocation);        } catch (Exception e) {            e.printStackTrace();        }    }    /**     * 字符串总宽度     * @param g     * @param str     * @return     */    private int  getStringWidth(Graphics g,String str) {        char[]  strcha=str.toCharArray();        int strWidth = g.getFontMetrics().charsWidth(strcha, 0, str.length());        return strWidth;    }    //字符高度    private int  getStringHeight(Graphics g) {        int height = g.getFontMetrics().getHeight();        return height;    }    private int calculateImageHeight(int rowCount){        BufferedImage image = new BufferedImage(100, 100,BufferedImage.TYPE_INT_RGB);        Graphics graphics = image.getGraphics();        graphics.setFont(titleFont);        int titleRowHeight = getStringHeight(graphics) + titleMargin * 2;        graphics.setFont(headFont);        int headRowHeight = getStringHeight(graphics) + headMargin * 2;        graphics.setFont(rowFont);        int rowHeight = getStringHeight(graphics) + rowMargin * 2;        graphics.setFont(bottomFont);        int bottomRowHeight = getStringHeight(graphics) + bottomMargin * 2;        int height = widthMargin * 2 + titleRowHeight + headRowHeight + rowHeight * rowCount + bottomRowHeight;        return height;    }    public void createTableChart(File img, String title, String bottomTitle, List headList, List> rows, int width){        widthMargin = 10;        heightMargin = 10;        this.width = width;        this.height = calculateImageHeight(rows.size());        BufferedImage image = new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB);        Graphics graphics = image.getGraphics();        ((Graphics2D)graphics).setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);        ((Graphics2D)graphics).setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);        graphics.setColor(Color.WHITE);        graphics.fillRect(0,0, width, height);        int rowWidth = (width - widthMargin * 2) / headList.size();        // 线条颜色        Color lineColor = new Color(237, 125,49);        // 创建标题背景        int xTitle = widthMargin;        int yTitle = heightMargin;        graphics.setFont(getTitleFont());        int titleHeight = getStringHeight(graphics);        writeTitle(xTitle, yTitle, titleHeight, title, graphics);        // 创建表头        int xHead = widthMargin;        int yHead = yTitle + titleHeight + titleMargin * 2;        graphics.setFont(getHeadFont());        int headHeight = getStringHeight(graphics);        writeHead(xHead, yHead,rowWidth, headHeight, headList,graphics);        // 表格内容        int xRow = widthMargin;        int yRow = yHead + headHeight + headMargin * 2;        graphics.setFont(rowFont);        int rowHeight = getStringHeight(graphics);        writeRow(xRow, yRow, rowWidth,rowHeight,headList, rows, graphics);        // 表格底部        int xBottom = widthMargin;        int yBottom = yRow + (rowHeight + rowMargin * 2) * rows.size();        graphics.setFont(bottomFont);        int bottomHeight = getStringHeight(graphics);        writeBottom(xBottom, yBottom, bottomHeight, bottomTitle, graphics);        // 保存图片        createImage(image, img);    }    private void writeTitle(int xTitle, int yTitle, int titleHeight, String title, Graphics graphics){        int titleWidth = getStringWidth(graphics, title);        graphics.setColor(getTitleBackgroup());        graphics.fillRect(xTitle,yTitle, width - widthMargin * 2 + 1, titleHeight + titleMargin * 2);        // 标题文字        graphics.setColor(Color.WHITE);        graphics.drawString(title, widthMargin + (width - widthMargin * 2)/2 - titleWidth / 2, heightMargin + titleHeight + titleMargin - 3);    }    private void drawString(Graphics graphics, String txt, int x, int y){        Graphics2D g2d = (Graphics2D)graphics;        g2d.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);//设置抗锯齿        g2d.setPaint(new Color(0, 0, 0, 64));//阴影颜色        g2d.drawString(txt, x, y);//先绘制阴影        g2d.setPaint(Color.BLACK);//正文颜色        g2d.drawString(txt, x, y);//用正文颜色覆盖上去    }    /**     * 写入表头文本     */    private void writeHead(int xHead, int yHead,int rowWidth, int headHeight, List headList,Graphics graphics){        // 背景填充        graphics.setColor(getHeadBackgroup());        graphics.fillRect(xHead, yHead, width - widthMargin * 2,  headHeight + headMargin * 2);        // 表格竖线        graphics.setColor(getLineColor());        for(int i = 0;i < headList.size() + 1; i++){            graphics.drawLine(xHead + i * rowWidth, yHead, xHead + i * rowWidth, yHead + headHeight + headMargin * 2);        }        graphics.setColor(Color.BLACK);        for(int i = 0; i < headList.size(); i++){            String str = headList.get(i);            if(str.length() < 5){                graphics.drawString(str, xHead + i * rowWidth + headMargin, yHead + headHeight + headMargin);            }            else{                String t1 = str.substring(0, 5);                int t1Width = getStringWidth(graphics, t1);                graphics.drawString(t1, xHead + i * rowWidth + headMargin, yHead + headHeight - headMargin/2 + 1);                String t2 = str.substring(5, str.length());                int t2Width = getStringWidth(graphics, t2);                int tdx = (t1Width - t2Width) / 2;                graphics.drawString(t2, xHead + i * rowWidth + headMargin + tdx, yHead + headHeight + headMargin + 3);            }        }    }    /**     * 写入表数据     */    private void writeRow(int xRow, int yRow, int rowWidth,int rowHeight,List headList, List> rows,Graphics graphics){        // 画横线        int rowCount = rows.size() + 1;        graphics.setColor(getLineColor());        for(int i = 0; i< rowCount; i++){            int y = yRow + i * (rowHeight + rowMargin * 2);            graphics.drawLine(xRow, y, width - widthMargin, y);        }        // 画竖线        int colCount = headList.size() + 1;        for(int c = 0; c < colCount; c++){            int x = xRow + c * rowWidth;            int maxY = yRow + rows.size() * (rowHeight + rowMargin * 2);            graphics.drawLine(x, yRow, x, maxY);        }        // 写入行数据        graphics.setColor(Color.BLACK);        for(int r = 0; r < rows.size(); r++){            List row = rows.get(r);            for(int c = 0; c < row.size(); c++){                int x = xRow + rowMargin + c * rowWidth;                int y = yRow + rowHeight + rowMargin+  r * (rowHeight + rowMargin * 2) - 2;//                graphics.drawString(row.get(c), x, y);                drawString(graphics, row.get(c), x, y);            }        }    }    private void writeBottom(int xBottom, int yBottom, int bottomHeight, String bottomTitle, Graphics graphics){        // 画横线        graphics.setColor(getLineColor());        graphics.drawLine(xBottom, yBottom + bottomHeight + bottomMargin * 2, width - widthMargin ,yBottom + bottomHeight + bottomMargin * 2);        // 画竖线        graphics.drawLine(xBottom, yBottom, xBottom ,yBottom + bottomHeight + bottomMargin * 2);        graphics.drawLine(width - widthMargin, yBottom, width - widthMargin ,yBottom + bottomHeight + bottomMargin * 2);        graphics.setColor(Color.BLACK);        int bottomTitleWidth = getStringWidth(graphics, bottomTitle);        int x = width / 2 - bottomTitleWidth / 2;        graphics.drawString(bottomTitle, x, yBottom + bottomHeight + bottomMargin);    }    public Font getTitleFont() {        return titleFont;    }    public void setTitleFont(Font titleFont) {        this.titleFont = titleFont;    }    public Font getHeadFont() {        return headFont;    }    public void setHeadFont(Font headFont) {        this.headFont = headFont;    }    public Font getRowFont() {        return rowFont;    }    public void setRowFont(Font rowFont) {        this.rowFont = rowFont;    }    public Font getBottomFont() {        return bottomFont;    }    public void setBottomFont(Font bottomFont) {        this.bottomFont = bottomFont;    }    public int getTitleMargin() {        return titleMargin;    }    public void setTitleMargin(int titleMargin) {        this.titleMargin = titleMargin;    }    public int getHeadMargin() {        return headMargin;    }    public void setHeadMargin(int headMargin) {        this.headMargin = headMargin;    }    public int getRowMargin() {        return rowMargin;    }    public void setRowMargin(int rowMargin) {        this.rowMargin = rowMargin;    }    public int getBottomMargin() {        return bottomMargin;    }    public void setBottomMargin(int bottomMargin) {        this.bottomMargin = bottomMargin;    }    public Color getLineColor() {        return lineColor;    }    public void setLineColor(Color lineColor) {        this.lineColor = lineColor;    }    public Color getTitleBackgroup() {        return titleBackgroup;    }    public void setTitleBackgroup(Color titleBackgroup) {        this.titleBackgroup = titleBackgroup;    }    public Color getHeadBackgroup() {        return headBackgroup;    }    public void setHeadBackgroup(Color headBackgroup) {        this.headBackgroup = headBackgroup;    }    public static void main(String[] args) throws Exception{        ExcelChart tableChart = new ExcelChart();        try {            List titleList = Arrays.asList("名称","增幅","收入","收入净利润","今年收入增幅比例");            List> rows = Arrays.asList(                    Arrays.asList("项目收入1", "6.05%", "9.95亿", "1.83亿", "5.74‰"),                    Arrays.asList("项目收入2", "6.05%", "9.95亿", "1.83亿", "5.74‰"),                    Arrays.asList("项目收入3", "6.05%", "9.95亿", "1.83亿", "5.74‰"),                    Arrays.asList("项目收入4", "6.05%", "9.95亿", "1.83亿", "5.74‰"),                    Arrays.asList("项目收入5", "6.05%", "9.95亿", "1.83亿", "5.74‰"),                    Arrays.asList("项目收入6", "6.05%", "9.95亿", "1.83亿", "5.74‰"),                    Arrays.asList("项目收入7", "6.05%", "9.95亿", "1.83亿", "5.74‰"),                    Arrays.asList("项目收入8", "6.05%", "9.95亿", "1.83亿", "5.74‰"),                    Arrays.asList("项目收入9", "6.05%", "9.95亿", "1.83亿", "5.74‰"),                    Arrays.asList("项目收入10", "6.05%", "9.95亿", "1.83亿", "5.74‰")            );            tableChart.setTitleBackgroup(new Color(237, 125, 49));            tableChart.setHeadBackgroup(new Color(252, 228, 214));            tableChart.setLineColor(new Color(237, 125, 49));            tableChart.createTableChart(new File("logs/tablechart1.png"),                    "我是标题一二三四五六七八九十","日期：9月10日 制图：https://my.oschina.net/penngo",                    titleList,rows,600);        } catch (Exception e) {            e.printStackTrace();        }    }}

以上就是java中怎么生成表格图表，小编相信有部分知识点可能是我们日常工作会见到或用到的。希望你能通过这篇文章学到更多知识。更多详情敬请关注行业资讯频道。