java zip压缩文件

package com.jcjt.download.utils;
import org.apache.tools.zip.ZipEntry;
import org.apache.tools.zip.ZipOutputStream;

import java.io.*;


/**
  * 压缩文件操作类 <br>
  */
public class ZipUtils {
    private static final int  BUFFER_SIZE = 2 * 1024;

    public static void toZip(String srcDir, OutputStream out) throws RuntimeException{
        ZipOutputStream zos = null;
        try {
            zos = new ZipOutputStream(out);
            File sourceFile = new File(srcDir);
            compress(sourceFile,zos,sourceFile.getName());
        }catch (Exception e){
            e.printStackTrace();
        }finally {
            try {
                if(zos != null){
                    zos.flush();
                    zos.close();
                }
            }catch (Exception e){
                throw new RuntimeException("ZIP流关闭失败");
            }
        }
    }

    private static void compress(File sourceFile, ZipOutputStream zos, String name) throws Exception{
        byte[] buf = new byte[BUFFER_SIZE];
        if(sourceFile.isFile()){
            // 向zip输出流中添加一个zip实体，构造器中name为zip实体的文件的名字
            //一定要设置GBK否则下载后zip内部文件中文乱码
            zos.setEncoding("GBK");
            zos.putNextEntry(new ZipEntry(name));
            // copy文件到zip输出流中
            int len;
            FileInputStream in = new FileInputStream(sourceFile);
            while ((len = in.read(buf)) != -1){
                zos.write(buf, 0, len);
            }
            zos.closeEntry();
            in.close();
        }else{
            File[] listFiles = sourceFile.listFiles();
            for (File file : listFiles){
                compress(file, zos, name + "/" + file.getName());
            }
        }
    }

    //删除源文件 
    public static void deleteSourceFile(File sourceFile){
        if(sourceFile.exists()){
            if(sourceFile.isFile()){
                sourceFile.delete();
            }else {
                File[] files = sourceFile.listFiles();
                for(File file : files){
                    deleteSourceFile(file);
                }
                sourceFile.delete();
            }
        }else {
            System.out.println("文件不存在！");
        }
    }


}