一、文件复制

package file;import org.apache.commons.io.FileUtils;import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;/*** @Author:张金贺* @Date：2022/7/23 13:29* @Version 1.0*/
public class finder {public static void main(String[] args) {
//        File file =new File();
//        file.isDirectory();
//        File[] files = file.listFiles();
//        file.getAbsolutePath();finder finder=new finder();String fileType= args[0];String sourcePath= args[1];String desPath= args[2];finder.copyAllFileToDestDir(fileType,sourcePath,desPath);}public void copyAllFileToDestDir(String fileType,String sourcePath,String desPath){
//        搜索指定类型文件List<File> fileList= searchFiles(fileType,sourcePath);
//       复制文件copyFiles(fileList,desPath);}/***   搜索指定类型的文件* @param fileType   文件类型* @param sourcePath  源路径* @return*/private List<File> searchFiles(String fileType, String sourcePath) {
//        返回结果集List<File> fileList=new ArrayList<>();
//        源文件夹对象File file=new File(sourcePath);if (file.isDirectory()){
//            加载文件夹中的文件loadFiles(fileType,file,fileList);}return fileList;}/***   加载file对象中的所有指定类型的文件，并放入fileList中* @param fileType   文件类型* @param file   源文件夹* @param fileList   返回结果集*/private void loadFiles(String fileType, File file, List<File> fileList) {File[] files = file.listFiles();if (files==null||files.length<=0){return;}for (File f : files) {if (f.isFile()&&f.getName().endsWith(fileType)){fileList.add(f);}else if (f.isFile()&& !f.getName().endsWith(fileType)){continue;}else {loadFiles(fileType,f,fileList);}}}/**** @param fileList  需要复制的文件夹列表* @param desPath  复制到哪个目录*/private void copyFiles(List<File> fileList, String desPath) {if (fileList==null ||fileList.isEmpty()){return;}File desFile =new File(desPath);for (File file : fileList) {try {FileUtils.copyFileToDirectory(file,desFile);} catch (IOException e) {e.printStackTrace();}}}
}

二、文件读写与图像处理

1.文档读

package file.manager;import java.io.*;/*** @Author:张金贺* @Date：2022/7/23 14:44* @Version 1.0*/
public class MyFileReader {public static void main(String[] args) {MyFileReader myFileReader =new MyFileReader();File file =new File("./test.txt");
//        myFileReader.readFileByLine(new File("./test.txt"));
//        myFileReader.readFileBySize(file,5);myFileReader.readTotalFile(file);}//按行读取文件public void readFileByLine(File file){try {BufferedReader bufferedReader =new BufferedReader(new FileReader(file)) ;String line =null;while ((line =bufferedReader.readLine())!=null){System.out.println(line);}
//            bufferedReader.readLine();} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}
//按指定长度读取文件public void readFileBySize(File file,int size){try {BufferedReader bufferedReader =new BufferedReader(new FileReader(file)) ;char[] chars =new char[size];while (-1!= bufferedReader.read(chars)){System.out.println(new String(chars));}bufferedReader.read(chars);} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}
//读取整个文件public void readTotalFile(File file){try (FileInputStream fileInputStream = new FileInputStream(file)) {byte[] bytes=new byte[(int) file.length()];//建议1024，防止文件过大带来的影响while (-1!=fileInputStream.read(bytes)){System.out.println(new String(bytes));}} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}
}

2.文档写

package file.manager;import java.io.*;
import java.nio.charset.StandardCharsets;/*** @Author:张金贺* @Date：2022/7/23 15:05* @Version 1.0*/
public class MyFileWriter {//   文档写入：追加写入、清空写入public static void main(String[] args) {File file=new File("./test.txt");MyFileWriter myFileWriter=new MyFileWriter();myFileWriter.writeContentToFile(file,false);}public void writeContentToFile(File file,boolean isAppend){try {BufferedOutputStream bufferedOutputStream=new BufferedOutputStream(new FileOutputStream(file,isAppend));bufferedOutputStream.write("123".getBytes());} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}
}

3.图像处理---缩放图片

package net.csdn.image;import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;/*** @Author:张金贺* @Date：2022/7/23 15:17* @Version 1.0*/
public class imageScale {public static void main(String[] args) throws IOException {imageScale imageScale=new imageScale();imageScale.scaleImage(new File("boy.png"),new File("boy1.png"),0.8);}/*** 缩放图片* @param sourceImageFile   源文件对象* @param destImageFile   目标文件对象* @param scale   缩放比例*/public void scaleImage(File sourceImageFile,File destImageFile,double scale) throws IOException {BufferedImage bufferedImage= ImageIO.read(sourceImageFile);int width = bufferedImage.getWidth();int height = bufferedImage.getHeight();Image scaledInstance = bufferedImage.getScaledInstance(Double.valueOf(width * scale).intValue(), Double.valueOf(height * scale).intValue(), Image.SCALE_DEFAULT);BufferedImage newImage=new BufferedImage(Double.valueOf(width * scale).intValue(), Double.valueOf(height * scale).intValue(),BufferedImage.TYPE_INT_ARGB);Graphics g = newImage.getGraphics();g.drawImage(scaledInstance,0,0,null);g.dispose();ImageIO.write(newImage,"png",destImageFile);}
}

4.图像处理---添加水印

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;/*** @Author:张金贺* @Date：2022/7/23 15:38* @Version 1.0*/
public class WaterMark {public static void main(String[] args) throws IOException {File file=new File("LOGO.png");WaterMark waterMark=new WaterMark();waterMark.addWaterMark(file);}/*** 加水印* @param file   需要加水印的图片对象*/public void addWaterMark(File file) throws IOException {//1读取图片文件BufferedImage bufferedImage = ImageIO.read(file);//2加水印Graphics g = bufferedImage.getGraphics();g.setColor(Color.BLUE);g.setFont(new Font("SimHei",Font.BOLD,50));g.drawString("hello word",100,200);//3输出加水印之后的图片ImageIO.write(bufferedImage,"png",new File("watermark.png"));}
}

5.图像处理---图片添加滤镜

package image;import com.jhlabs.image.InvertFilter;
import com.jhlabs.image.PointFilter;import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;/*** @Author:张金贺* @Date：2022/7/23 16:07* @Version 1.0*/
//jar包地址：jhlabs.com/ip/filters/index.html
public class filterr {public static void main(String[] args) throws IOException {filterr filterr=new filterr();filterr.addImageFilter(new File("LOGO.png"),new File("filter.png"),new InvertFilter());}public void addImageFilter(File sourceImageFile, File destFile, PointFilter pointFilter) throws IOException {BufferedImage sourceImage = ImageIO.read(sourceImageFile);Image scaledInstance = sourceImage.getScaledInstance(sourceImage.getWidth(), sourceImage.getHeight(), Image.SCALE_DEFAULT);BufferedImage bufferedImage=new BufferedImage(sourceImage.getWidth(),sourceImage.getHeight(),BufferedImage.TYPE_INT_ARGB);Graphics graphics = bufferedImage.getGraphics();graphics.drawImage(scaledInstance,0,0,null);graphics.dispose();pointFilter.filter(sourceImage,bufferedImage);ImageIO.write(bufferedImage,"png",destFile);}
}

三、自动化电子表格处理

1.添加jar包

网盘文件CSDN文件夹内

2.使用步骤

（1）创建表格类文件

package csdn;/*** @Author:张金贺* @Date：2022/7/28 14:53* @Version 1.0*/
public class Person {private String name;private String city;private String cellPhone;public String getName() {return name;}public Person(String name, String city, String cellPhone) {this.name = name;this.city = city;this.cellPhone = cellPhone;}public void setName(String name) {this.name = name;}public String getCity() {return city;}public void setCity(String city) {this.city = city;}public String getCellPhone() {return cellPhone;}public void setCellPhone(String cellPhone) {this.cellPhone = cellPhone;}@Overridepublic String toString() {return "Person{" +"name='" + name + '\'' +", city='" + city + '\'' +", cellPhone='" + cellPhone + '\'' +'}';}
}

（2）表格写入

package csdn;import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;/*** @Author:张金贺* @Date：2022/7/28 14:48* @Version 1.0*/
public class ExcelWriter {public static void main(String[] args) throws IOException {ExcelWriter excelWriter = new ExcelWriter();
//        excelWriter.fillExcel(null,new File("D:\\Person.xls"));List<Person> personList = new ArrayList<>();personList.add(new Person("张金贺","北京","13888888888"));excelWriter.fillExcel(personList,new File("D:\\Person.xls"));}/*** 写入Excel文件** @param data   用户数据* @param dataFile   目标文件*/public void fillExcel(List<Person> data, File dataFile) throws IOException {XSSFWorkbook xssWorkbook = new XSSFWorkbook();XSSFSheet sheet = xssWorkbook.createSheet("用户");XSSFRow row = sheet.createRow(0);row.createCell(0).setCellValue("姓名");row.createCell(1).setCellValue("城市");row.createCell(2).setCellValue("手机号");for (int i = 0; i < data.size(); i++) {XSSFRow r = sheet.createRow(i + 1);r.createCell(0).setCellValue(data.get(i).getName());r.createCell(1).setCellValue(data.get(i).getCity());r.createCell(2).setCellValue(data.get(i).getCellPhone());}FileOutputStream fileOutputStream = new FileOutputStream(dataFile);xssWorkbook.write(fileOutputStream);fileOutputStream.close();xssWorkbook.close();}
}

（3）表格读取

package csdn;import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.Iterator;/*** @Author:张金贺* @Date：2022/7/28 15:18* @Version 1.0*/
public class ExcelReader {public static void main(String[] args) throws IOException {ExcelReader excelReader = new ExcelReader();excelReader.readExcel(new File("D:\\Person.xls"));}/*** 读取Excel文件* @param dataFile   源文件对象*/public void readExcel(File dataFile) throws IOException {XSSFWorkbook xssWorkbook = new XSSFWorkbook(new FileInputStream(dataFile));XSSFSheet sheet = xssWorkbook.getSheetAt(0);Iterator<Row> rowIterator = sheet.rowIterator();while (rowIterator.hasNext()) {org.apache.poi.ss.usermodel.Row row = rowIterator.next();System.out.println(row.getCell(0).getStringCellValue() + " " + row.getCell(1).getStringCellValue() + " " + row.getCell(2).getStringCellValue());}xssWorkbook.close();
//        for (int i = 0; i < sheet.getPhysicalNumberOfRows(); i++) {
//            XSSRow row = sheet.getRow(i);
//            System.out.println(row.getCell(0).getStringCellValue() + " " + row.getCell(1).getStringCellValue() + " " + row.getCell(2).getStringCellValue());
//        }
//        xssWorkbook.close();}
}

3.案例

package csdn;import com.github.javafaker.Faker;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.List;
import java.util.Locale;
import java.util.stream.Collectors;
import java.util.stream.Stream;/*** @Author:张金贺* @Date：2022/7/29 13:28* @Version 1.0*/
public class PoiDemo {public static void main(String[] args) throws IOException {//创建一个工作薄XSSFWorkbook xssfWorkbook = new XSSFWorkbook();//创建一个sheet，名字为personxssfWorkbook.createSheet("person");XSSFSheet sheet = xssfWorkbook.getSheet("person");//创建第一行，行的下标从0开始XSSFRow row = sheet.createRow(0);//设置第一行的第一列为姓名，也就是设置表头的内容row.createCell(0).setCellValue("姓名");//设置第一行的第二列为城市row.createCell(1).setCellValue("城市");//设置第一行的第三列为手机号row.createCell(2).setCellValue("手机号");Faker faker = new Faker(Locale.CHINA);//生成10个随机人物信息List<Person> personList = Stream.generate(() -> new Person(faker.name().fullName(), faker.address().city(), faker.phoneNumber().cellPhone())).limit(10).collect(Collectors.toList());//将人物数据写入表格for (int i = 0; i < personList.size() ; i++) {XSSFRow sheetRow = sheet.createRow(i+1);Person person = personList.get(i);sheetRow.createCell(0).setCellValue(person.getName());sheetRow.createCell(1).setCellValue(person.getCity());sheetRow.createCell(2).setCellValue(person.getCellPhone());}//创建一个文件，用于将表格内容输出到该文件中File file = new File("person.xlsx");xssfWorkbook.write(new FileOutputStream(file));}}

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Java操作磁盘文件

一、文件复制

二、文件读写与图像处理

1.文档读

2.文档写

3.图像处理---缩放图片

4.图像处理---添加水印

5.图像处理---图片添加滤镜

三、自动化电子表格处理

1.添加jar包

2.使用步骤

（1）创建表格类文件

（2）表格写入

（3）表格读取

3.案例

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