java中壓縮文件並下載的實例詳解

//定義壓縮包存在服務器的路徑
String path = request.getSession().getServletContext().getRealPath("/WEB-INF/fileTemp");
//創建路徑
File FilePath = new File(path + "/file");
if (!FilePath.exists()) {
FilePath.mkdir();
}
String path = FilePath.getPath() + "/";
//定義導出壓縮包的名稱
String title ="問價壓縮包";
//壓縮包格式
String fileNamezip = title + ".zip";
String zipPath = path + fileNamezip;
//創建一個ZIP輸出流並實例化緩沖區域
ZipOutputStream out = new ZipOutputStream(new BufferedOutputStream(new FileOutputStream(zipPath)));
//設置編碼格式(解決linux出現亂碼)
out.setEncoding("gbk");
//定義字節數組
byte data[] = new byte[2048];
//獲取文件記錄(獲取文件記錄代碼省略)
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){//存在文件類型
     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) + "\"");
//讀取文件流輸出到到另一個位置
fileVo.getFileIo(fileOutputStream);
fileOutputStream.close(); 
} catch (Exception e) {
logger.error("異常：原因如下"+e.getMessage(), e);
} finally {
try {
if (fileOutputStream != null) {
fileOutputStream.close();
}
} catch (IOException e1) {
// TODO Auto-generated catch block
logger.error("異常：原因如下"+e1.getMessage(), e1);
}
}
}

util.entdZip(FilePath.getPath());

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import org.apache.tools.zip.ZipEntry;
import org.apache.tools.zip.ZipOutputStream;
/** 
 * @project: Test 
 * @author chenssy
 * @date 2013-7-28 
 * @Description: 文件壓縮工具類
 *                   將指定文件/文件夾壓縮成zip、rar壓縮文件
 */
public class CompressedFileUtil {
    /**
     * 默認構造函數
     */
    public CompressedFileUtil(){

    }
    /**
     * @desc 將源文件/文件夾生成指定格式的壓縮文件,格式zip
     * @param resourePath 源文件/文件夾
     * @param targetPath  目的壓縮文件保存路徑
     * @return void
     * @throws Exception 
     */
    public void compressedFile(String resourcesPath,String targetPath) throws Exception{
        File resourcesFile = new File(resourcesPath);     //源文件
        File targetFile = new File(targetPath);           //目的
        //如果目的路徑不存在，則新建
        if(!targetFile.exists()){     
            targetFile.mkdirs();  
        }

        String targetName = resourcesFile.getName()+".zip";   //目的壓縮文件名
        FileOutputStream outputStream = new FileOutputStream(targetPath+"\\"+targetName);
        ZipOutputStream out = new ZipOutputStream(new BufferedOutputStream(outputStream));

        createCompressedFile(out, resourcesFile, "");

        out.close();  
    }

    /**
     * @desc 生成壓縮文件。
     *                  如果是文件夾，則使用遞歸，進行文件遍歷、壓縮
     *       如果是文件，直接壓縮
     * @param out  輸出流
     * @param file  目標文件
     * @return void
     * @throws Exception 
     */
    public void createCompressedFile(ZipOutputStream out,File file,String dir) throws Exception{
        //如果當前的是文件夾，則進行進一步處理
        if(file.isDirectory()){
            //得到文件列表信息
            File[] files = file.listFiles();
            //將文件夾添加到下一級打包目錄
            out.putNextEntry(new ZipEntry(dir+"/"));

            dir = dir.length() == 0 ? "" : dir +"/";

            //循環將文件夾中的文件打包
            for(int i = 0 ; i < files.length ; i++){
                createCompressedFile(out, files[i], dir + files[i].getName());         //遞歸處理
            }
        }
        else{   //當前的是文件，打包處理
            //文件輸入流
            FileInputStream fis = new FileInputStream(file);

            out.putNextEntry(new ZipEntry(dir));
            //進行寫操作
            int j =  0;
            byte[] buffer = new byte[1024];
            while((j = fis.read(buffer)) > 0){
                out.write(buffer,0,j);
            }
            //關閉輸入流
            fis.close();
        }
    }

    public static void main(String[] args){
        CompressedFileUtil compressedFileUtil = new CompressedFileUtil();

        try {
            compressedFileUtil.compressedFile("G:\\zip", "F:\\zip");
            System.out.println("壓縮文件已經生成...");
        } catch (Exception e) {
            System.out.println("壓縮文件生成失敗...");
            e.printStackTrace();
        }
    }
}