java图片生成

标题，列头，背景颜色，合并单元格，先看图片效果：

package cn.com.alerts.util;
 
import sun.misc.BASE64Encoder;
 
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.text.SimpleDateFormat;
import java.util.Date;
 
 
public class BuildImgsUtil {
 
    public final static BuildImgsUtil pictureUtil = new BuildImgsUtil();
 
    private BuildImgsUtil() {
    }
 
    public static BuildImgsUtil getInstance() {
        return pictureUtil;
    }
 
 
 
    /**
     * 通过传入的数据，进行图片生成。
     * @param
     * @return
     */
    public void createImagesByDefineData(double[] colWidthPercent, String firstTitle, String twoTitle, String[][] tableData, String filePath, String fileName) throws Exception{
        myGraphicsGenerationDefineData(colWidthPercent, firstTitle, twoTitle, tableData, filePath, fileName);
    }
 
    public void myGraphicsGenerationDefineData(double[] colWidthPercent, String firstTitle, String twoTitle, String cellsValue[][], String path, String fileName) throws Exception{
 
        // 字体大小
        int fontTitileSize = 15;
        // 横线的行数
        int totalrow = cellsValue.length + 1;
        // 竖线的行数
        int totalcol = 0;
        if (cellsValue[0] != null) {
            totalcol = cellsValue[0].length;
        }
        // 图片宽度
        int imageWidth = totalcol *260;
        // 行高
        int rowheight = 40;
        // 图片高度
        int imageHeight = totalrow * rowheight + 30;
        // 起始高度
        int startHeight = 20;
        // 起始宽度
        int startWidth = 10;
        // 单元格宽度
        int colwidth = (int) ((imageWidth - 20) / totalcol);
        BufferedImage image = new BufferedImage(imageWidth, imageHeight, BufferedImage.TYPE_INT_RGB);
        Graphics graphics = image.getGraphics();
        graphics.setColor(Color.WHITE);
        graphics.fillRect(0, 0, imageWidth, imageHeight);
        graphics.setColor(new Color(220, 240, 240));
 
        // 表头标题，背景填充
        int rowWidth = imageWidth;
        graphics.setColor(new Color(241, 239, 242));
        graphics.fillRect(startWidth+1, 60, rowWidth-20, rowheight);
 
 
        graphics.setColor(Color.black);
        //画顶部的横线
        graphics.drawLine(startWidth,1 , startWidth + colwidth * totalcol, 1 );
        //画顶部左边的坚线
        graphics.drawLine(startWidth,  1, startWidth, startHeight + rowheight );
        //画顶部右边的坚线
        graphics.drawLine(startWidth+ colwidth * totalcol,  1, startWidth+ colwidth * totalcol, startHeight + rowheight );
 
        //画横线
        for (int j = 0; j < totalrow; j++) {
            graphics.setColor(Color.black);
            graphics.drawLine(startWidth,
                    startHeight + (j + 1) * rowheight,
                    startWidth + colwidth * totalcol,
                    startHeight + (j + 1) * rowheight);
        }
 
        // 竖线位置坐标
        int[] colLineWidth = new int[colWidthPercent.length];
        int startWidthInt = startWidth;
        for(int i = 1; i < colWidthPercent.length + 1; i++){
            startWidthInt += (int)(imageWidth * colWidthPercent[i - 1]);
            // 防止超出
            if(startWidthInt > imageWidth){
                startWidthInt = imageWidth - startWidth;
            }
            colLineWidth[i-1] = startWidthInt;
        }
 
        //画竖线
        for (int k = 0; k < colWidthPercent.length; k++) {
            graphics.setColor(Color.black);
            graphics.drawLine(colLineWidth[k], startHeight + rowheight, colLineWidth[k], startHeight + rowheight * totalrow);
        }
 
        graphics.setColor(Color.black);
 
        //设置字体
        Font font = new Font("微软雅黑", Font.BOLD, fontTitileSize);
        graphics.setFont(font);
 
        //写标题
//        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
//        String title02 = "生成时间：" + simpleDateFormat.format(new Date());
        graphics.drawString(twoTitle, startWidth+5, startHeight + rowheight - 18);
 
        Font fonttile = new Font("微软雅黑", Font.BOLD, 18);
        graphics.setFont(fonttile);
 
        //写第一标题
        graphics.drawString(firstTitle, startWidth, 18);
 
        //写第二个标题
        //graphics.drawString(twoTitle, 790, 60);
        //写入内容
        for (int n = 0; n < cellsValue.length; n++) {
            for (int h = 0; h < cellsValue[n].length; h++) {
 
                if(cellsValue[n] == null || cellsValue[n][h] == null){
                    // 合并单元格(横着的部分)
                    graphics.setColor(Color.white);
                    graphics.drawLine(colLineWidth[h] + 1, startHeight + (n + 1) * rowheight, colLineWidth[h == cellsValue[n].length ? h : (h+1)] - 1, startHeight + (n + 1) * rowheight);
                    continue;
                }
                font = new Font("微软雅黑", Font.PLAIN, fontTitileSize);
                graphics.setFont(font);
                graphics.setColor(Color.BLACK);
                if (h > 0) {
                    if (!cellsValue[n][h].equals(cellsValue[n][h - 1])) {
                        //表头第2列开始
                        if(n==0){
                            font = new Font("微软雅黑", Font.BOLD, fontTitileSize);
                            graphics.setFont(font);
                            // graphics.setColor(Color.BLUE);
                        }
                        graphics.drawString(cellsValue[n][h], colLineWidth[h] + 35, startHeight + rowheight * (n + 2) - 10);
                    }
                } else {
                    //表头第一列
                    if(n==0 && h==0){
                        font = new Font("微软雅黑", Font.BOLD, fontTitileSize);
                        graphics.setFont(font);
                        //graphics.setColor(Color.BLUE);
                    }
                    graphics.drawString(cellsValue[n][h], colLineWidth[h] + 35, startHeight + rowheight * (n + 2) - 10);
                }
 
            }
        }
        // 保存图片
        createImage(image, path, fileName);
    }
 
    /**
     * 将图片保存到指定位置
     *
     * @param image        缓冲文件类
     * @param fileLocation 文件位置
     */
    public static void createImage(BufferedImage image, String fileLocation, String fileName) {
        try {
            File file = new File(fileLocation);
            if (!file.exists()) {
                file.mkdir();
            }
            FileOutputStream fos = new FileOutputStream(fileLocation + fileName);
            BufferedOutputStream bos = new BufferedOutputStream(fos);
            ImageIO.write(image, "jpg", fos);
           /* JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(bos);
            encoder.encode(image);*/
            bos.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
 
    /**
     * 图片转换为string
     *
     * @return
     */
    public static String fileToByteArray(String filePath) throws Exception {
        BASE64Encoder encoder = new sun.misc.BASE64Encoder();
        File file = new File(filePath);
        BufferedImage bi = ImageIO.read(file);
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        ImageIO.write(bi, "jpg", baos);
        byte[] bytes = baos.toByteArray();
        return encoder.encodeBuffer(bytes).trim();
    }
 
    public static void main(String[] args) {
        String firstTitle = "xx系统";
        String twoTitle = "xxx系统";
 
        String[] tableTile = {"序号", "模块", "指标", "结果"};
//        double[] colWidthPercent = {0,0.1, 0.3,  0.3, 0.3};
 
//        String[] tableTile = { "链路","IP",  "指标", "结果"};
        double[] colWidthPercent = {0,  0.25,0.25,  0.25, 0.25};
 
        String[][] tableData2 = new String[5][tableTile.length];
 
        for (int i = 0; i < tableTile.length; i++) {
            tableData2[0][i] = tableTile[i];
        }
        tableData2[1][0] = "1";
        tableData2[2][0] = "2";
        tableData2[3][0] = "3";
        tableData2[4][0] = "4";
 
 
        tableData2[1][1] = "程序";
        tableData2[2][1] = "数据库1";
        tableData2[3][1] = "数据库2";
        tableData2[4][1] = "基础";
 
        tableData2[1][2] = "可用性";
        tableData2[2][2] = "192.168.243.3.11：222";
        tableData2[3][2] = "可用性";
 
 
        tableData2[1][3] = "1000";
        //tableData2[2][3] = "200";
 
        try {
            BuildImgsUtil.getInstance().createImagesByDefineData(colWidthPercent, firstTitle, twoTitle, tableData2, "E:\\", "test.jpg");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
 
}