看到一篇好用的excel转图片的代码,封装和改动了一部分
原文https://www.cnblogs.com/newflydd/p/4912662.html#top
用到jar包,POI3.17
不多说了,直接上代码
package com.example.excel;
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.text.DecimalFormat;
import java.text.NumberFormat;
import java.util.ArrayList;
import java.util.List;
import javax.imageio.ImageIO;
import org.apache.commons.lang3.time.DateFormatUtils;
import org.apache.poi.hssf.usermodel.HSSFDateUtil;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.xssf.usermodel.XSSFFont;
import sun.awt.SunHints;
/**
* width:pix=getColumnWidthInPixels*1.15
* height:pix=getHeightInPoints*96/72
* <p>
* 本示例用来读取Excel报表文件,并力图将报表无差别转化成PNG图片
* 使用POI读取Excel各项数据
* 使用JAVA 2D绘制PNG
* TODO 本示例基本实现了常见Excel的所有样式输出,但Office2007以后的版本添加了条件样式功能,,所以无法实现
* 今后可以通过关键字标注等方法,在Excel中需要加入条件样式的单元格用注解标明,使用JAVA计算得出样因为POI的API无法读取条件样式式再绘制出来
*/
public class DrawFromExcel {
/**
*
* @param excelUrl excel路径
* @param path 图片存储路径
* @param filename 文件名
* @return 返回一个图片路径 path+System.currentTimeMillis()+filename+".png"
* @throws Exception 异常
*/
public static String excelTOImage(String excelUrl,String path,String filename) throws Exception {
//excel是否存在
File file=new File(excelUrl);
if(!file.exists()){
throw new Exception("file does not exist!");
}
int imageWidth = 0;
int imageHeight = 0;
Workbook wb = WorkbookFactory.create(file);
Sheet sheet = wb.getSheetAt(0);//第一个工作表
List<CellRangeAddress> rangeAddress = sheet.getMergedRegions(); // 获取整个sheet中合并单元格组合的集合
//检查区域内是否存在数据
int rowSize = sheet.getPhysicalNumberOfRows();
int colSize = sheet.getRow(0).getPhysicalNumberOfCells();
if (rowSize == 0 || colSize == 0) {
throw new Exception("the row or col of the area is wrong!");
}
// 遍历需要扫描的区域
UserCell[][] cells = new UserCell[rowSize][colSize];
int[] rowPixPos = new int[rowSize + 1];
rowPixPos[0] = 0;
int[] colPixPos = new int[colSize + 1];
colPixPos[0] = 0;
for (int i = 0; i < rowSize; i++) {
for (int j = 0; j < colSize; j++) {
cells[i][j] = new UserCell();
cells[i][j].setCell(sheet.getRow(i).getCell(j));
cells[i][j].setRow(i);
cells[i][j].setCol(j);
boolean ifShow = !(sheet.isColumnHidden(j) || sheet.getRow(i).getZeroHeight());//行列不可以隐藏
cells[i][j].setShow(ifShow);
// 计算所求区域宽度
float widthPix = !ifShow ? 0 : sheet.getColumnWidthInPixels(j);//如果该单元格是隐藏的,则置宽度为0
if (i == 0) {
imageWidth += widthPix;
}
colPixPos[j + 1] = (int) (widthPix * 1.15 + colPixPos[j]);
}
// 计算所求区域高度
boolean ifShow = !sheet.getRow(i).getZeroHeight(); //行序列不能隐藏
float heightPoint = !ifShow ? 0 : sheet.getRow(i).getHeightInPoints(); // 如果该单元格是隐藏的,则置高度为0
imageHeight += heightPoint;
rowPixPos[i + 1] = (int) (heightPoint * 96 / 72) + rowPixPos[i];
}
imageHeight = imageHeight * 96 / 72;
imageWidth = imageWidth * 115 / 100;
wb.close();
List<Grid> grids = new ArrayList<>();
for (int i = 0; i < rowSize; i++) {
for (int j = 0; j < colSize; j++) {
Cell cell = cells[i][j].getCell();//当前表格
Grid grid = new Grid();
// 设置坐标和宽高
grid.setX(colPixPos[j]);
grid.setY(rowPixPos[i]);
grid.setWidth(colPixPos[j + 1] - colPixPos[j]);
grid.setHeight(rowPixPos[i + 1] - rowPixPos[i]);
grid.setRow(cells[i][j].getRow());
grid.setCol(cells[i][j].getCol());
grid.setShow(cells[i][j].isShow());
// 判断是否为合并单元格
int[] isInMergedStatus = isInMerged(grid.getRow(), grid.getCol(), rangeAddress);
if (isInMergedStatus[0] == 0 && isInMergedStatus[1] == 0) {
// 此单元格是合并单元格,并且不是第一个单元格,需要跳过本次循环,不进行绘制
continue;
} else if (isInMergedStatus[0] != -1 && isInMergedStatus[1] != -1) {
// 此单元格是合并单元格,并且属于第一个单元格,则需要调整网格大小
int lastRowPos = Math.min(isInMergedStatus[0], rowSize - 1);
int lastColPos = Math.min(isInMergedStatus[1], colSize - 1);
grid.setWidth(colPixPos[lastColPos + 1] - colPixPos[j]);
grid.setHeight(rowPixPos[lastRowPos + 1] - rowPixPos[i]);
}
// 单元格背景颜色
CellStyle cs = cell.getCellStyle();
if (cs.getFillPatternEnum() == FillPatternType.SOLID_FOREGROUND)
grid.setBgColor(cell.getCellStyle().getFillForegroundColorColor());
// 设置字体
org.apache.poi.ss.usermodel.Font font = wb.getFontAt(cs.getFontIndex());
grid.setFont(font);
// 设置字体前景色
if (font instanceof XSSFFont) {
XSSFFont xf = (XSSFFont) font;
grid.setFtColor(xf.getXSSFColor());
}
// 设置文本
String strCell;
if(cell.getCellTypeEnum() == CellType.NUMERIC){
if (HSSFDateUtil.isCellDateFormatted(cell)) {
strCell = DateFormatUtils.format(cell.getDateCellValue(), "yyyy-MM-dd");
} else {
NumberFormat nf = NumberFormat.getInstance();
strCell = String.valueOf(nf.format(cell.getNumericCellValue())).replace(",", "");
}
}else if(cell.getCellTypeEnum() == CellType.STRING){
strCell = String.valueOf(cell.getStringCellValue());
}else if(cell.getCellTypeEnum() == CellType.BOOLEAN){
strCell = String.valueOf(cell.getBooleanCellValue());
}else if(cell.getCellTypeEnum() == CellType.ERROR){
strCell = "错误类型";
}else {
strCell = "";
}
if (cell.getCellStyle().getDataFormatString().contains("0.00%")) {
try {
double dbCell = Double.parseDouble(strCell);
strCell = new DecimalFormat("#.00").format(dbCell * 100) + "%";
} catch (NumberFormatException ignored) {
}
}
grid.setText(strCell.matches("\\w*\\.0") ? strCell.substring(0, strCell.length() - 2) : strCell);
grids.add(grid);
}
}
BufferedImage image = new BufferedImage(imageWidth, imageHeight, BufferedImage.TYPE_INT_RGB);
Graphics2D g2d = image.createGraphics();
// 平滑字体
g2d.setRenderingHint(SunHints.KEY_ANTIALIASING, SunHints.VALUE_ANTIALIAS_OFF);
g2d.setRenderingHint(SunHints.KEY_TEXT_ANTIALIASING, SunHints.VALUE_TEXT_ANTIALIAS_DEFAULT);
g2d.setRenderingHint(SunHints.KEY_STROKE_CONTROL, SunHints.VALUE_STROKE_DEFAULT);
g2d.setRenderingHint(SunHints.KEY_TEXT_ANTIALIAS_LCD_CONTRAST, 140);
g2d.setRenderingHint(SunHints.KEY_FRACTIONALMETRICS, SunHints.VALUE_FRACTIONALMETRICS_OFF);
g2d.setRenderingHint(SunHints.KEY_RENDERING, SunHints.VALUE_RENDER_DEFAULT);
g2d.setColor(Color.white);
g2d.fillRect(0, 0, imageWidth, imageHeight);
// 绘制表格
for (Grid g : grids) {
if (!g.isShow())
continue;
// 绘制背景色
g2d.setColor(g.getBgColor() == null ? Color.white : g.getBgColor());
g2d.fillRect(g.getX(), g.getY(), g.getWidth(), g.getHeight());
// 绘制边框
g2d.setColor(Color.black);
g2d.setStroke(new BasicStroke(1));
g2d.drawRect(g.getX(), g.getY(), g.getWidth(), g.getHeight());
// 绘制文字,居中显示
g2d.setColor(g.getFtColor());
Font font = g.getFont();
FontMetrics fm = g2d.getFontMetrics(font);
int strWidth = fm.stringWidth(g.getText());// 获取将要绘制的文字宽度
g2d.setFont(font);
g2d.drawString(g.getText(),
g.getX() + (g.getWidth() - strWidth) / 2,
g.getY() + (g.getHeight() - font.getSize()) / 2 + font.getSize());
}
g2d.dispose();
filename=System.currentTimeMillis()+filename;
String imgUrl = path+filename+".png";
ImageIO.write(image, "png", new File(imgUrl));
System.out.println("Output to PNG file Success!");
return imgUrl;
}
/**
* 判断Excel中的单元格是否为合并单元格
*
* @param row 当前行号
* @param col 当前列号
* @param rangeAddress 整个sheet中合并单元格组合的集合
* @return 如果不是合并单元格返回{-1,-1},如果是合并单元格并且是一个单元格返回{lastRow,lastCol},
* 如果是合并单元格并且不是第一个格子返回{0,0}
*/
private static int[] isInMerged(int row, int col, List<CellRangeAddress> rangeAddress) {
int[] isInMergedStatus = {-1, -1};
for (CellRangeAddress cra : rangeAddress) {
if (row == cra.getFirstRow() && col == cra.getFirstColumn()) {
isInMergedStatus[0] = cra.getLastRow();
isInMergedStatus[1] = cra.getLastColumn();
return isInMergedStatus;
}
if (row >= cra.getFirstRow() && row <= cra.getLastRow()) {
if (col >= cra.getFirstColumn() && col <= cra.getLastColumn()) {
isInMergedStatus[0] = 0;
isInMergedStatus[1] = 0;
return isInMergedStatus;
}
}
}
return isInMergedStatus;
}
}
package com.example.excel;
import java.awt.Color;
import java.awt.Font;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.xssf.usermodel.XSSFColor;
public class Grid {
private boolean show;
private int row; //对应Excel中的row,也可以理解为cells[i][j]的i
private int col; //对应Excel中的col,也可以理解为cells[i][j]的j
private int x; //x坐标
private int y; //y坐标
private int width;
private int height;
private String text;
private Font font;//= new Font("微软雅黑", Font.PLAIN, 12);
private Color bgColor = null;
private Color ftColor = null;
public int getRow() {
return row;
}
public void setRow(int row) {
this.row = row;
}
public int getCol() {
return col;
}
public void setCol(int col) {
this.col = col;
}
public int getX() {
return x;
}
public void setX(int x) {
this.x = x;
}
public int getY() {
return y;
}
public void setY(int y) {
this.y = y;
}
public boolean isShow() {
return show;
}
public void setShow(boolean show) {
this.show = show;
}
public int getWidth() {
return width;
}
public void setWidth(int width) {
this.width = width;
}
public int getHeight() {
return height;
}
public void setHeight(int height) {
this.height = height;
}
public String getText() {
return text;
}
public void setText(String text) {
this.text = text;
}
public Color getBgColor() {
return bgColor;
}
/**
* 将poi.ss.usermodel.Color 转换成 java.awt.Color
* <a href="http://home.cnblogs.com/u/309701/" target="_blank">@param</a> color
*/
public void setBgColor(org.apache.poi.ss.usermodel.Color color) {
this.bgColor = poiColor2awtColor(color);
}
public void setBgColor(java.awt.Color color) {
this.bgColor = color;
}
public Color getFtColor() {
return ftColor;
}
public void setFtColor(org.apache.poi.ss.usermodel.Color color) {
this.ftColor = poiColor2awtColor(color);
}
public Font getFont() {
return font;
}
public void setFont(org.apache.poi.ss.usermodel.Font font) {
if (font != null) {
this.font = new java.awt.Font(font.getFontName(), Font.BOLD, font.getFontHeight() / 20 + 2);
}
}
private java.awt.Color poiColor2awtColor(org.apache.poi.ss.usermodel.Color color) {
java.awt.Color awtColor = null;
if (color instanceof XSSFColor) { //.xlsx
XSSFColor xc = (XSSFColor) color;
String rgbHex = xc.getARGBHex();
if (rgbHex != null) {
awtColor = new Color(Integer.parseInt(rgbHex.substring(2), 16));
}
} else if (color instanceof HSSFColor) { //.xls
HSSFColor hc = (HSSFColor) color;
short[] s = hc.getTriplet();
if (s != null) {
awtColor = new Color(s[0], s[1], s[2]);
}
}
return awtColor;
}
}
package com.example.excel;
import java.awt.Color;
import org.apache.poi.ss.usermodel.Cell;
public class UserCell implements Comparable<UserCell> {
private Cell cell;
private int row;
private int col;
private boolean show;
private String text = "";
private Color color = null;
public Cell getCell() {
return cell;
}
public void setCell(Cell cell) {
this.cell = cell;
}
public int getRow() {
return row;
}
public void setRow(int row) {
this.row = row;
}
public int getCol() {
return col;
}
public void setCol(int col) {
this.col = col;
}
public boolean isShow() {
return show;
}
public void setShow(boolean show) {
this.show = show;
}
public String getText() {
return text;
}
public void setText(String text) {
this.text = text;
}
public Color getColor() {
return color;
}
public void setColor(Color color) {
this.color = color;
}
@Override
public int compareTo(UserCell uc) {
try {
double meDouble = Double.parseDouble(this.getText().replaceAll("%", ""));
double heDouble = Double.parseDouble(uc.getText().replaceAll("%", ""));
if (meDouble < heDouble)
return -1;
else if (meDouble > heDouble)
return 1;
} catch (Exception e) {
}
return 0;
}
}