java打包文件 下载

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

public class ZipUtil {

private static Logger logger = LoggerFactory.getLogger(ZipUtil.class);

/**
 * 将文件数据写入文件压缩流
 * @param fileStream 要压缩的文件流
 * @param zipOutputStream 压缩文件流
 * @param index
 * @throws IOException
 */
public static void zipFile(InputStream fileStream, String fileName, ZipOutputStream zipOutputStream, HashMap index) throws IOException {
    logger.info("开始压缩文件--------------------------------------");
    ZipEntry entry = new ZipEntry(fileName);
    if (index.containsKey(fileName)){
    //遇到想同房文件名 重命名
        int i= (Integer) index.get(fileName);
        int i1 = fileName.lastIndexOf('.');
        String name = fileName.substring(0, i1);
        String type = fileName.substring(i1);
        zipOutputStream.putNextEntry(new ZipEntry( name+"(" + i + ")"+type));
        index.put(fileName,i+1);
    } else {
        zipOutputStream.putNextEntry(entry);
        index.put(fileName,1);
    }

    byte [] content=new byte[1024];
    int len;
    while((len=fileStream.read(content))!=-1){
        zipOutputStream.write(content,0,len);
        zipOutputStream.flush();
    }

    // 关闭文件入流
    fileStream.close();
}

}