工具类收集

左手的ㄟ右手 2023-01-17 09:22 85阅读 0赞

## 图片处理工具类： ##

package org.springblade.common.utils;
    
    import cn.hutool.core.io.FileUtil;
    import cn.hutool.http.HttpUtil;
    import com.alibaba.fastjson.JSON;
    import com.alibaba.fastjson.JSONObject;
    import lombok.extern.slf4j.Slf4j;
    import org.apache.commons.lang3.StringUtils;
    import org.springblade.common.config.CustomFileConfig;
    import sun.misc.BASE64Decoder;
    import javax.annotation.Resource;
    import javax.imageio.ImageIO;
    import javax.swing.*;
    import java.awt.*;
    import java.awt.geom.Ellipse2D;
    import java.awt.image.BufferedImage;
    import java.io.*;
    import java.util.HashMap;
    import java.util.Map;
    
    /** * 图片处理工具类 * * @author wq * @date 2021/4/27 23:19 */
    @Slf4j
    public class ImageUtil { 
    
    	@Resource
    	private CustomFileConfig customFileConfig;
    
    	/** * 图片转base64 * * @param base64 data:image/jpeg;base64,/9j/4AA... * @return 上传到OSS服务器后返回的结果 */
    	public JSONObject base64ToPicUrl(String base64) { 
    		String targetPath = "";
    		if (System.getProperty("os.name").toLowerCase().startsWith("win")) { 
    			log.info("Windows系统...");
    			targetPath = customFileConfig.getWindows();
    		} else { 
    			log.info("Linux系统...");
    			targetPath = customFileConfig.getLinux();
    		}
    		String currPath = decodeBase64(base64, targetPath, "jpg", false);
    		// 将生成的PDF上传到OSS服务器,保存返回的访问链接到用电信息表
    		Map<String, Object> params = new HashMap<>();
    		params.put("file", FileUtil.file(currPath));
    		String resultData = HttpUtil.post(CustomConst.OSS_URL, params);
    		return (JSONObject) JSON.parse(resultData);
    	}
    
    	public static String decodeBase64(String base64,String filePath,String suffix,boolean isSafe){ 
    		if(StringUtils.isBlank(base64)||StringUtils.isBlank(filePath)||StringUtils.isBlank(suffix)){ 
    			throw new NullPointerException();
    		}
    		OutputStream out=null;
    		String fileName=null;
    		try { 
    			byte[] b=new byte[2048];
    			if(isSafe){ 
    				java.util.Base64.Decoder decoder = java.util.Base64.getUrlDecoder();
    				b = decoder.decode(base64);
    			}else{ 
    				BASE64Decoder decoder = new BASE64Decoder();
    				b = decoder.decodeBuffer(base64.substring(base64.indexOf(",") + 1));
    			}
    			for (int i = 0; i < b.length; ++i) { 
    				if (b[i] < 0) { // 调整异常数据
    					b[i] += 256;
    				}
    			}
    			File file=new File(filePath);
    			if(!file.exists()){ 
    				file.mkdirs();
    			}
    			fileName=filePath+System.currentTimeMillis()+"."+suffix;
    			out = new BufferedOutputStream(new FileOutputStream(fileName));
    			out.write(b);
    			out.flush();
    		}catch (Exception e) { 
    
    		}finally { 
    			if(out!=null){ 
    				try { 
    					out.close();
    				} catch (IOException e) { 
    					e.printStackTrace();
    				}
    
    			}
    		}
    		return fileName;
    	}
    
    	/** * 将图片处理成圆形 * * @param originPath 图片绝对路径 C:/Users/Administrator/Desktop/testImage.png * @param targetPath 图片处理后保存绝对的路径 C:/Users/Administrator/Desktop/pic.png * @return 图片处理后完整路径 */
    	public static String imageToCircle(String originPath, String targetPath) { 
    		log.info("将图片处理成圆形：{}", originPath);
    		BufferedImage bi1 = null;
    		try { 
    			bi1 = ImageIO.read(new File(originPath));
    		} catch (IOException e) { 
    			throw new RuntimeException("读取图片失败！");
    		}
    		// 根据需要是否使用 BufferedImage.TYPE_INT_ARGB
    		BufferedImage bi2 = null;
    		if (bi1 != null) { 
    			bi2 = new BufferedImage(bi1.getWidth(), bi1.getHeight(),
    				BufferedImage.TYPE_INT_RGB);
    
    			Ellipse2D.Double shape = new Ellipse2D.Double(0, 0, bi1.getWidth(), bi1
    				.getHeight());
    
    			Graphics2D g2 = bi2.createGraphics();
    			g2.setBackground(Color.WHITE);
    			g2.fill(new Rectangle(bi2.getWidth(), bi2.getHeight()));
    			g2.setClip(shape);
    			// 使用 setRenderingHint 设置抗锯齿
    			g2.drawImage(bi1, 0, 0, null);
    			g2.dispose();
    
    			try { 
    				ImageIO.write(bi2, "jpg", new File(targetPath));
    			} catch (IOException e) { 
    				// TODO Auto-generated catch block
    				throw new RuntimeException("图片写出失败！");
    			}
    		} else { 
    			throw new RuntimeException("将图片处理成圆形失败！");
    		}
    		return targetPath;
    	}
    
    	/** * 去除图片白色背景 * 注意：要保存为.png格式 * * @param originPath 图片绝对路径 C:/Users/Administrator/Desktop/testImage.png * @param targetPath 图片处理后保存绝对的路径 C:/Users/Administrator/Desktop/pic.png * @return 图片处理后完整路径 */
    	public static String wipeWhiteBackground(String originPath, String targetPath) { 
    		log.info("去除图片白色背景：{}", originPath);
    		File file = new File(originPath);
    		InputStream is;
    		try { 
    			is = new FileInputStream(file);
    			// 如果是MultipartFile类型，那么自身也有转换成流的方法：is = file.getInputStream();
    			BufferedImage bi = ImageIO.read(is);
    			ImageIcon imageIcon = new ImageIcon((Image) bi);
    			BufferedImage bufferedImage = new BufferedImage(imageIcon.getIconWidth(), imageIcon.getIconHeight(),
    				BufferedImage.TYPE_4BYTE_ABGR);
    			Graphics2D g2D = (Graphics2D) bufferedImage.getGraphics();
    			g2D.drawImage(imageIcon.getImage(), 0, 0, imageIcon.getImageObserver());
    			int alpha = 0;
    			for (int j1 = bufferedImage.getMinY(); j1 < bufferedImage.getHeight(); j1++) { 
    				for (int j2 = bufferedImage.getMinX(); j2 < bufferedImage.getWidth(); j2++) { 
    					int rgb = bufferedImage.getRGB(j2, j1);
    					int R = (rgb & 0xff0000) >> 16;
    					int G = (rgb & 0xff00) >> 8;
    					int B = (rgb & 0xff);
    					if (((255 - R) < 30) && ((255 - G) < 30) && ((255 - B) < 30)) { 
    						rgb = ((alpha + 1) << 24) | (rgb & 0x00ffffff);
    					}
    					bufferedImage.setRGB(j2, j1, rgb);
    				}
    			}
    			g2D.drawImage(bufferedImage, 0, 0, imageIcon.getImageObserver());
    			ImageIO.write(bufferedImage, "png", new File(targetPath));
    		} catch (Exception e) { 
    			throw new RuntimeException("去除图片白色背景失败！");
    		}
    		return targetPath;
    	}
    
    }

## 下载 ##

package org.springblade.common.utils;
    
    import lombok.extern.slf4j.Slf4j;
    import javax.servlet.http.HttpServletResponse;
    import java.io.*;
    import java.net.MalformedURLException;
    import java.net.URL;
    
    /** * 文件工具类 * * @author wq * @date 2021/4/27 17:46 */
    @Slf4j
    public class FileUtils { 
    
    	/** * 下载 及 预览 * * @param filePath 需要下载的文件绝对路径 * @param response response * @param isOnLine 下载：false 预览：true * @param fileName 输出的文件名 */
    	public static void download(String filePath, HttpServletResponse response,
    						 boolean isOnLine, String fileName) { 
    		log.info("文件位置：{}", filePath);
    		File f = new File(filePath);
    		if (!f.exists()) { 
    			try { 
    				response.sendError(404, "File not found！");
    			} catch (IOException e) { 
    				throw new RuntimeException("文件不存在！");
    			}
    			return;
    		}
    		BufferedInputStream br = null;
    		try { 
    			br = new BufferedInputStream(new FileInputStream(f));
    		} catch (FileNotFoundException e) { 
    			throw new RuntimeException("文件未找到！");
    		}
    		byte[] bs = new byte[1024];
    		int len = 0;
    		response.reset(); // 非常重要
    		if (isOnLine) {  // 在线打开方式
    			URL u = null;
    			try { 
    				u = new URL("file:///" + filePath);
    			} catch (MalformedURLException e) { 
    				throw new RuntimeException("预览文件路径有误！");
    			}
    			String contentType = null;
    			try { 
    				contentType = u.openConnection().getContentType();
    			} catch (IOException e) { 
    				throw new RuntimeException("预览文件ContentType有误！");
    			}
    			response.setContentType(contentType);
    			response.setHeader("Content-Disposition", "inline;filename="
    				+ fileName);
    			// 文件名应该编码成utf-8，注意：使用时，我们可忽略这句
    		} else { 
    			// 纯下载方式
    // response.setContentType("application/pdf");
    // response.setContentType("application/x-msdownload");
    			response.setContentType("application/octet-stream");
    			response.setHeader("Content-Disposition", "attachment;filename="
    				+ fileName);
    		}
    		OutputStream out = null;
    		try { 
    			out = response.getOutputStream();
    			while ((len = br.read(bs)) > 0) { 
    				out.write(bs, 0, len);
    			}
    			out.flush();
    			out.close();
    			br.close();
    		} catch (IOException e) { 
    			throw new RuntimeException("下载失败，请稍后重试！");
    		}
    	}
    
    }

## base64 ##

package org.springblade.common.utils;
    
    import org.apache.commons.lang3.StringUtils;
    import sun.misc.BASE64Decoder;
    import sun.misc.BASE64Encoder;
    import java.io.*;
    
    /** * Base64工具类 * * @author wq * @date 2021/4/28 10:19 */
    public class Base64Utils { 
    
        /** * 将图片文件转换成base64字符串，参数为该图片的路径 * * @param imageFile * @return java.lang.String */
        public String ImageToBase64(String imageFile) { 
            InputStream in = null;
            byte[] data = null;
    
            // 读取图片字节数组
            try { 
                in = new FileInputStream(imageFile);
                data = new byte[in.available()];
                in.read(data);
                in.close();
            } catch (IOException e) { 
                e.printStackTrace();
            }
            // 对字节数组Base64编码
            BASE64Encoder encoder = new BASE64Encoder();
    
            if (data != null) { 
                return "data:image/jpeg;base64," + encoder.encode(data);// 返回Base64编码过的字节数组字符串
            }
            return null;
        }
    
        /** * 将base64解码成图片并保存在传入的路径下 * 第一个参数为base64 ，第二个参数为路径 * * @param base64, imgFilePath * @return boolean */
        public boolean Base64ToImage(String base64, String imgFilePath) { 
            // 对字节数组字符串进行Base64解码并生成图片
            if (base64 == null) // 图像数据为空
    		{ 
    			return false;
    		}
            BASE64Decoder decoder = new BASE64Decoder();
            try { 
                // Base64解码
                byte[] b = decoder.decodeBuffer(base64);
                for (int i = 0; i < b.length; ++i) { 
                    if (b[i] < 0) { // 调整异常数据
                        b[i] += 256;
                    }
                }
                OutputStream out = new FileOutputStream(imgFilePath);
                out.write(b);
                out.flush();
                out.close();
                return true;
            } catch (Exception e) { 
                return false;
            }
    
        }
    
        /** * 用来测试工具类是否成功 * * @param args * @return void */
        public static void main(String[] args) { 
            String path = "C:/Users/Administrator/Desktop/头像.jpg";
            Base64Utils base64Utils = new Base64Utils();
            String s = base64Utils.ImageToBase64(path);
            System.out.println(s);
    
    
            String newpath = "C:/Users/Administrator/Desktop/";
    		String s1 = decodeBase64(s, newpath, "jpg", false);
    		System.out.println("s1 = " + s1);
        }
    
    	public static String decodeBase64(String base64,String filePath,String suffix,boolean isSafe){ 
    		if(StringUtils.isBlank(base64)||StringUtils.isBlank(filePath)||StringUtils.isBlank(suffix)){ 
    			throw new NullPointerException();
    		}
    		OutputStream out=null;
    		String fileName=null;
    		try { 
    			byte[] b=new byte[2048];
    			if(isSafe){ 
    				java.util.Base64.Decoder decoder = java.util.Base64.getUrlDecoder();
    				b = decoder.decode(base64);
    			}else{ 
    				BASE64Decoder decoder = new BASE64Decoder();
    				b = decoder.decodeBuffer(base64.substring(base64.indexOf(",") + 1));
    			}
    			for (int i = 0; i < b.length; ++i) { 
    				if (b[i] < 0) { // 调整异常数据
    					b[i] += 256;
    				}
    			}
    			File file=new File(filePath);
    			if(!file.exists()){ 
    				file.mkdirs();
    			}
    			fileName=filePath+System.currentTimeMillis()+"."+suffix;
    			out = new BufferedOutputStream(new FileOutputStream(fileName));
    			out.write(b);
    			out.flush();
    		}catch (Exception e) { 
    
    		}finally { 
    			if(out!=null){ 
    				try { 
    					out.close();
    				} catch (IOException e) { 
    					e.printStackTrace();
    				}
    
    			}
    		}
    		return fileName;
    	}
    
    }