如何在java中压缩文件并下载？

[local file header + file data + data descriptor]{1,n} + central directory + end of central directory record

即

[文件头+文件数据+数据描述符]{此处可重复n次}+核心目录+目录结束标识

当压缩包中有多个文件时，就会有多个[文件头+文件数据+数据描述符]

//定义压缩包存在服务器的路径

String path = request.getSession().getServletContext().getRealPath("/WEB-INF/fileTemp");

//创建路径

File FilePath = new File(path + "/file");

if (!FilePath.exists()) {

FilePath.mkdir();

}

String path = FilePath.getPath() + "/";

//定义导出压缩包的名称

String title ="问价压缩包";

//压缩包格式

String fileNamezip = title + ".zip";

String zipPath = path + fileNamezip;

//创建一个ZIP输出流并实例化缓冲区域

ZipOutputStream out = new ZipOutputStream(new BufferedOutputStream(new FileOutputStream(zipPath)));

//设置编码格式(解决linux出现乱码)

out.setEncoding("gbk");

//定义字节数组

byte data[] = new byte[2048];

//获取文件记录(获取文件记录代码省略)

List FileList =。。。;

if (!FileList.isEmpty()) {

ExportUtil util = new ExportUtil(title,title,

request, response, FilePath.getPath());

}

util.startZip(FilePath.getPath());

for (int i = 0; i < FileList.size(); i++) {

fileVo fileVo=FileList.get(i);

export(fileVo,request,response,title,FilePath.getPath(),fileName);

}

------

public void export(fileVo fileVo, HttpServletRequest request,

HttpServletResponse response, String title,String path, String fileName) {

FileOutputStream fileOutputStream = null;

try {

File dirFile = null; 

int i = fileVo.getName().lastIndexOf(".");

        if(i!=-1){//存在文件类型

         fileName1 = fileName1 + "." +  (fileVo.getName()).substring(i+1);

        }

boolean bFile = false;

String mkdirName = path + File.separatorChar + title;

dirFile = new File(mkdirName);

if(!dirFile.exists()) {

dirFile.getParentFile().mkdirs();

}

if (dirFile.isDirectory()) {

path = mkdirName + File.separatorChar + fileName1;

} else {

bFile = dirFile.mkdirs();

}

if (bFile) {

path = mkdirName + File.separatorChar + fileName1;

} 

fileOutputStream = new FileOutputStream(path.replace("*", "")); 

String fileName = URLEncoder.encode(fileName1, "UTF-8");

if (fileName.length() > 110) {

fileName = new String(fileName1.getBytes("gb2312"), "ISO8859-1");

}

response.setHeader("Connection", "close");

response.setHeader("Content-Type", "application/octet-stream");

response.setContentType("application/x-msdownload");

response.setHeader("Content-Disposition", "attachment; filename=\""

+ Utf8Util.toUtf8String(fileName) + "\"");

//读取文件流输出到到另一个位置

fileVo.getFileIo(fileOutputStream);

fileOutputStream.close(); 

} catch (Exception e) {

logger.error("异常：原因如下"+e.getMessage(), e);

} finally {

try {

if (fileOutputStream != null) {

fileOutputStream.close();

}

} catch (IOException e1) {

// TODO Auto-generated catch block

logger.error("异常：原因如下"+e1.getMessage(), e1);

}

}

}

------

util.entdZip(FilePath.getPath());