在机器人需要发表格图片需求，我搜索了一些第三方包，最终使用了java内置的Graphics2D来画表格生成jpg图片，再通过cq语句发送。
表格图片，需要有标题，表格头，表格内容，将表格头和表格前三名设置背景色。
使用Graphics2D画图，需要画横线，竖线，还有字体，其中选择位置进行渲染比较繁琐。所以我将画表格分为几部分来画
1、先定图片大小
图片的高度，等于标题加表格头加表格内容所有高度再加上余留边角部分大概20个像素
图片的宽度，等于表格头的项数加上余留边角部分大概20个像素
int rows = 0;
int maxfont = 0;
if (allValue != null && allValue.size() > 0) {
rows += (2+allValue.size());
}
for (List<String> strings : allValue) {
maxfont = strings.get(0).length()>maxfont?strings.get(0).length():maxfont;
}
// 实际数据行数+标题+备注
//初始化宽度
int numwidth = 50;//序号宽度
int totalrow = 1+rows;//总行数
int namewidth = maxfont * 22;//名字列宽度
int otherwidth = 80;//其他列宽度
int imageWidth = numwidth + namewidth +
otherwidth*(headers.length-2) + 20;//图片总宽度
//初始化高度
int imageHeight = totalrow * 30 + 20;//图片总高度
int rowheight = 30;//行高
//图片边框留白
int startHeight = 10;//余留上方10像素
int startWidth = 10;//余留左方10像素
//创建Graphics2D对象,用图片缓存流
BufferedImage image = new BufferedImage(imageWidth, imageHeight, BufferedImage.TYPE_INT_RGB);
Graphics2D graphics = image.createGraphics();
2、画背景
通过刚刚计算的图片的高度和宽度，画一张白色的画补作为图片总背景
graphics.setColor(Color.WHITE);
graphics.fillRect(0, 0, imageWidth, imageHeight);
再将表格头和前三名的背景画上，通过计算再使用fillRect画上
//画表头背景
graphics.setColor(new Color(150,0,0));
if (allValue != null && allValue.size() > 0) {
graphics.fillRect(startWidth + 1, startHeight + rowheight + 1, imageWidth - startWidth - 6, rowheight - 1);
}
//画前三名背景
int redstartH = 2;
graphics.setColor(new Color(190,25,0));
for (int temp = 0; temp < allValue.size(); temp++) {
List strings = allValue.get(temp);
if (strings != null) {
graphics.fillRect(startWidth + 1,startHeight + redstartH*rowheight +1 , imageWidth - startWidth - 6,rowheight - 1);
}
redstartH++;
if(temp==2)break;
}
3、画表格体
画表格体，先画横线再画竖线，通过上方留白高度+行高*n来画横线，通过左方留白宽度+各列宽度来画竖线。
// 画横线
for (int j = 0; j < totalrow - 1; j++) {
graphics.setColor(Color.gray);
graphics.drawLine(startWidth, startHeight + (j + 1) * rowheight, imageWidth - 5,
startHeight + (j + 1) * rowheight);
}
int rightLine;
// 画竖线
graphics.setColor(Color.gray);
if (allValue != null && allValue.size() > 0) {
for (int k = 0; k < headers.length+1; k++) {
rightLine = getRightMargin(k,startWidth, namewidth,otherwidth,imageWidth);
graphics.drawLine(rightLine, startHeight + rowheight, rightLine,
startHeight + (allValue.size()+2)*rowheight);
}
}
4、写标题，表头
已计算出每行的高度，把标题写在第一行，表头写在第二行。通过累加行高得出些的位置。
因为标题从第一行开始，表格头从第二行开始，内容从第三行开始，所以设置了startH来控制画图位置
// 设置字体，准备写入文字
Font font = new Font("宋体", Font.BOLD, 20);
graphics.setFont(font);
graphics.setColor(Color.black);
// 写标题
if (allValue != null && allValue.size() > 0) {
graphics.drawString(titles, imageWidth / 3 + startWidth+30, startHeight + rowheight - 10);
}
// 写入表头
int startH = 2;
graphics.setColor(Color.WHITE);
font = new Font("宋体", Font.BOLD, 20);
graphics.setFont(font);
if (allValue != null && allValue.size() > 0) {
for (int m = 0; m < headers.length; m++) {
int strWidth = graphics.getFontMetrics().stringWidth(headers[m]);
rightLine = getRightMargin(m,startWidth, namewidth,otherwidth,imageWidth);
if(m==0)
rightLine = rightLine + (numwidth-strWidth)/2;
else if(m==1)
rightLine = rightLine + (namewidth-strWidth)/2;
else
rightLine = rightLine + (otherwidth-strWidth)/2;
graphics.drawString(headers[m], rightLine,
startHeight + startH*rowheight - 10);
}
}
// 写入内容
startH = 3;
graphics.setColor(Color.white);
graphics.setFont(new Font("宋体", Font.BOLD, 20));
if (allValue != null && allValue.size() > 0) {
for (int n = 0; n < allValue.size(); n++) {
if (n == 3) {
graphics.setColor(Color.black);
graphics.setFont(new Font("宋体", Font.PLAIN, 20));
}
List<String> arr = allValue.get(n);
for (int l = 0; l < arr.size() + 1; l++) {
rightLine = getRightMargin(l, startWidth, namewidth, otherwidth, imageWidth) + 5;
if (l == 0) {
int strWidth = graphics.getFontMetrics().stringWidth(String.valueOf(n + 1));
graphics.drawString(String.valueOf(n + 1), rightLine + (numwidth - strWidth) / 2 - 5,
startHeight + rowheight * (n + startH) - 10);
} else {
int strWidth = graphics.getFontMetrics().stringWidth(arr.get(l - 1));
if (l == 1)
graphics.drawString(arr.get(l - 1), rightLine,
startHeight + rowheight * (n + startH) - 10);
else
graphics.drawString(arr.get(l - 1), rightLine + (otherwidth - strWidth) / 2 - 5,
startHeight + rowheight * (n + startH) - 10);
}
}
}
}
5、消除锯齿
因为2D画图画字体会有锯齿，而graphics2D类有抗锯齿和画笔柔顺的开关，设置如下
graphics.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
graphics.setRenderingHint(RenderingHints.KEY_STROKE_CONTROL, RenderingHints.VALUE_STROKE_DEFAULT);
graphics.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
Stroke s = new BasicStroke(imageWidth, BasicStroke.CAP_ROUND, BasicStroke.JOIN_MITER);
graphics.setStroke(s);
6、生成图片
然后创建一个1.jpg将图片的缓存来写出到图片文件中，在项目的相对路径中就有一张图片1.jpg
graphics.drawImage(image.getScaledInstance(imageWidth, imageHeight, Image.SCALE_SMOOTH), 0, 0, null);
String path = "1.jpg";
ImageIO.write(image, "jpg", new File(path));
测试画图效果
List<List<List<String>>> allValue = new ArrayList<>();
List<List<String>> contentArray1 = new ArrayList<>();
for(int i = 0;i<10;i++){
contentArray1.add(Arrays.asList(
new String[]{"谭宇","300","5.00","1.00","1234","1234","1234","100"}));
}
String[] headTitles =
new String[]{"序号","名字","成绩","击键","码长","退格","回改","选重","错字"};
String titles = "跟打成绩";
try {
graphicsGeneration(contentArray1,titles,headTitles);
} catch (Exception e) {
e.printStackTrace();
}
image.png
例子源码
package ImgTest;
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
public class imatest {
public static String graphicsGeneration(List<List<String>> allValue, String titles, String[] headers ) throws Exception {
int rows = 0;
int maxfont = 0;
if (allValue != null && allValue.size() > 0) {
rows += (2+allValue.size());
}
for (List<String> strings : allValue) {
maxfont = strings.get(0).length()>maxfont?strings.get(0).length():maxfont;
}
// 实际数据行数+标题+备注
int numwidth = 50;
int totalrow = 1+rows;
int namewidth = maxfont * 22;
int otherwidth = 80;
int imageWidth = numwidth + namewidth + otherwidth*(headers.length-2) + 20;
int imageHeight = totalrow * 30 + 20;
int rowheight = 30;
int startHeight = 10;
int startWidth = 10;
BufferedImage image = new BufferedImage(imageWidth, imageHeight, BufferedImage.TYPE_INT_RGB);
Graphics2D graphics = image.createGraphics();
graphics.setColor(Color.WHITE);
graphics.fillRect(0, 0, imageWidth, imageHeight);
//画表头背景
graphics.setColor(new Color(150,0,0));
if (allValue != null && allValue.size() > 0) {
graphics.fillRect(startWidth + 1, startHeight + rowheight + 1, imageWidth - startWidth - 6, rowheight - 1);
}
//画前三名背景
int redstartH = 2;
graphics.setColor(new Color(190,25,0));
for (int temp = 0; temp < allValue.size(); temp++) {
List strings = allValue.get(temp);
if (strings != null) {
graphics.fillRect(startWidth + 1,startHeight + redstartH*rowheight +1 , imageWidth - startWidth - 6,rowheight - 1);
}
redstartH++;
if(temp==2)break;
}
// 画横线
for (int j = 0; j < totalrow - 1; j++) {
graphics.setColor(Color.gray);
graphics.drawLine(startWidth, startHeight + (j + 1) * rowheight, imageWidth - 5,
startHeight + (j + 1) * rowheight);
}
int rightLine;
// 画竖线
graphics.setColor(Color.gray);
if (allValue != null && allValue.size() > 0) {
for (int k = 0; k < headers.length+1; k++) {
rightLine = getRightMargin(k,startWidth, namewidth,otherwidth,imageWidth);
graphics.drawLine(rightLine, startHeight + rowheight, rightLine,
startHeight + (allValue.size()+2)*rowheight);
}
}
// 设置字体，准备写入文字
Font font = new Font("宋体", Font.BOLD, 20);
graphics.setFont(font);
graphics.setColor(Color.black);
// 写标题
if (allValue != null && allValue.size() > 0) {
graphics.drawString(titles, imageWidth / 3 + startWidth+30, startHeight + rowheight - 10);
}
// 写入表头
int startH = 2;
graphics.setColor(Color.WHITE);
font = new Font("宋体", Font.BOLD, 20);
graphics.setFont(font);
if (allValue != null && allValue.size() > 0) {
for (int m = 0; m < headers.length; m++) {
int strWidth = graphics.getFontMetrics().stringWidth(headers[m]);
rightLine = getRightMargin(m,startWidth, namewidth,otherwidth,imageWidth);
if(m==0)
rightLine = rightLine + (numwidth-strWidth)/2;
else if(m==1)
rightLine = rightLine + (namewidth-strWidth)/2;
else
rightLine = rightLine + (otherwidth-strWidth)/2;
graphics.drawString(headers[m], rightLine,
startHeight + startH*rowheight - 10);
}
}
// 写入内容
startH = 3;
graphics.setColor(Color.white);
graphics.setFont(new Font("宋体", Font.BOLD, 20));
if (allValue != null && allValue.size() > 0) {
for (int n = 0; n < allValue.size(); n++) {
if (n == 3) {
graphics.setColor(Color.black);
graphics.setFont(new Font("宋体", Font.PLAIN, 20));
}
List<String> arr = allValue.get(n);
for (int l = 0; l < arr.size() + 1; l++) {
rightLine = getRightMargin(l, startWidth, namewidth, otherwidth, imageWidth) + 5;
if (l == 0) {
int strWidth = graphics.getFontMetrics().stringWidth(String.valueOf(n + 1));
graphics.drawString(String.valueOf(n + 1), rightLine + (numwidth - strWidth) / 2 - 5,
startHeight + rowheight * (n + startH) - 10);
} else {
int strWidth = graphics.getFontMetrics().stringWidth(arr.get(l - 1));
if (l == 1)
graphics.drawString(arr.get(l - 1), rightLine,
startHeight + rowheight * (n + startH) - 10);
else
graphics.drawString(arr.get(l - 1), rightLine + (otherwidth - strWidth) / 2 - 5,
startHeight + rowheight * (n + startH) - 10);
}
}
}
}
graphics.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
graphics.setRenderingHint(RenderingHints.KEY_STROKE_CONTROL, RenderingHints.VALUE_STROKE_DEFAULT);
graphics.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
Stroke s = new BasicStroke(imageWidth, BasicStroke.CAP_ROUND, BasicStroke.JOIN_MITER);
graphics.setStroke(s);
graphics.drawImage(image.getScaledInstance(imageWidth, imageHeight, Image.SCALE_SMOOTH), 0, 0, null);
String path = "1.jpg";
ImageIO.write(image, "jpg", new File(path));
return path;
}
/**
* 获取竖线和文字的水平位置
* @param k
* @param startWidth
* @param namewidth
* @param otherwidth
* @param imageWidth
* @return
*/
private static int getRightMargin(int k, int startWidth, int namewidth,int otherwidth, int imageWidth) {
int rightLine = 0;
if (k == 0) {
rightLine = startWidth;
} else if (k == 1) {
rightLine = startWidth + 50;
} else if (k == 2) {
rightLine = startWidth + 50 + namewidth;
} else if (k >= 3 &&k<9) {
rightLine = startWidth + +50 + namewidth + (k - 2) * otherwidth;
} else if (k == 9)
rightLine = imageWidth - 5;
return rightLine;
}
public static void initChartData(){
List<List<String>> contentArray1 = new ArrayList<>();
for(int i = 0;i<10;i++){
contentArray1.add(Arrays.asList(new String[]{"谭宇","300","5.00","1.00","1234","1234","1234","100"}));
}
String[] headTitles = new String[]{"序号","名字","成绩","击键","码长","退格","回改","选重","错字"};
String titles = "跟打成绩";
try {
graphicsGeneration(contentArray1,titles,headTitles);
} catch (Exception e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
initChartData();
}
}
