The files generated during the process of java IO stream cutting and file deletion

 1. The java package cannot be misleading, and the misleading is basically cool. This point needs to be paid attention to

2. The streams from new must be closed, otherwise they cannot be deleted.

package text;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.SequenceInputStream;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Enumeration;
import java.util.Properties;

public class GH {
	public static void main(String[] args) throws IOException, InterruptedException {
		File sFile = new File("E:\\test\\放到");
		if (!sFile.exists()) {
			sFile.mkdirs();
		}
		gefile("F:\\图片哦/38449e9e78bc30000006.jpg", "E:\\test\\放到");
		merge("E:\\test\\\\放到", "E:\\test\\新建文件夹");
		Thread.sleep(1000);
		ddelete("E:\\test\\放到");
		sFile.deleteOnExit();
	}

	/**
	 * path1是要割的文件路径，path2是文件割完要放入的路径
	 */
	public static void gefile(String path1, String path2) throws IOException {

		File file = new File(path1);
		FileOutputStream fileOutputStream = null;
		FileInputStream fileInputStream = new FileInputStream(file);
		byte[] d = new byte[1024 * 10];
		int len = 0;
		int count = 1;
		while ((len = fileInputStream.read(d)) != -1) {
			/**
			 * 重点：new 出来的FileOutoutStream都要关闭
			 */
			fileOutputStream = new FileOutputStream(new File(path2, count++ + ".part"));
			fileOutputStream.write(d);
			fileOutputStream.close();
		}
		fileOutputStream.flush();

		Properties properties = new Properties();
		properties.setProperty("num", count + "");// 因为要字符串所以count要+""
		properties.setProperty("filename", file.getName());
		fileOutputStream = new FileOutputStream(new File(path2, count + ".properties"));
		properties.store(fileOutputStream, "name");
		fileInputStream.close();
		fileOutputStream.close();
	}

	public static void merge(String path1, String path2) throws IOException, InterruptedException {
		/**
		 * path1是已割文件的路径 path2是合完文件要放入的路径
		 */
		File p1 = new File(path1);
		File[] part = p1.listFiles(new suffixfilter(".properties"));
		File pFile = part[0];
		Properties properties = new Properties();
		FileInputStream fileInputStream = new FileInputStream(pFile);
		properties.load(fileInputStream);// 把配置文件存到集合============
		int k = Integer.parseInt(properties.getProperty("num"));
		String string = properties.getProperty("filename");
//获取碎片文件
		File[] parts = p1.listFiles(new suffixfilter(".part"));
		ArrayList<FileInputStream> a1 = new ArrayList<FileInputStream>();
		for (int i = 0; i < k - 1; i++) {
			a1.add(new FileInputStream(parts[i]));
		}
		Enumeration<FileInputStream> enumeration = Collections.enumeration(a1);
		SequenceInputStream sis = new SequenceInputStream(enumeration);
		FileOutputStream fileOutputStream = new FileOutputStream((new File(path2, string)));
		int len = -1;
		byte[] s = new byte[1024 * 10];
		int o = 0;

		while ((len = sis.read(s)) != -1) {
			System.out.println(++o);
			fileOutputStream.write(s, 0, len);
		}

		fileOutputStream.flush();
		fileInputStream.close();
		fileOutputStream.close();
		sis.close();
		/**
		 * 删除合好的文件（图片）
		 */
		File d = new File(path2, string);
		Thread.sleep(2000);// 设置图片存在的时间
		d.delete();
	}

//删除新建的文件（放到）
	public static void ddelete(String path) throws IOException {
		File p1 = new File(path);
		File[] part = p1.listFiles(new suffixfilter(".properties"));
		File pFile = part[0];
		Properties properties = new Properties();
		FileInputStream fileInputStream = new FileInputStream(pFile);
		properties.load(fileInputStream);// 把配置文件存到集合============
		int k = Integer.parseInt(properties.getProperty("num"));
		String string = properties.getProperty("filename");
//获取碎片文件
		File[] parts = p1.listFiles(new suffixfilter(".part"));
		fileInputStream.close();
		/**
		 * 删除part文件
		 */
		for (int i = 0; i < k - 1; i++) {
			parts[i].delete();
		}
		/**
		 * 删除properties文件
		 */
		pFile.delete();
	}
}

That's basically it.

Added: filter

package text;

import java.io.File;
import java.io.FilenameFilter;

public class suffixfilter implements FilenameFilter {
private String cString;
	public suffixfilter(String suffix) {
		// TODO Auto-generated constructor stub
		this.cString=suffix;
	}
	@Override
	public boolean accept(File dir, String name) {
		// TODO Auto-generated method stub
		return name.endsWith(cString);
	}

}