有关于zip文件流的解压缩操作

/***********************************************************************

*

*@author:chenyong

*@data: 2011-03-05

*

************************************************************************/

 

struts2中实现

一、读取zip文件流并解压读取文件内容：

 

this.request = ServletActionContext.getRequest();
  this.response = ServletActionContext.getResponse();
  System.out.println("==== begin ====");
  BufferedReader br = null;
  ServletInputStream is = null;
  BufferedInputStream bis = null;
  ZipInputStream zis = null;
  try {
   StringBuffer sbContent = new StringBuffer();

   is = request.getInputStream();
   bis = new BufferedInputStream(is, 2048);
   zis = new ZipInputStream(bis);
   ZipEntry ze = null;
   while ((ze = zis.getNextEntry()) != null) {
    long size = ze.getSize();
    if (size > 0) {
     String line;
     br = new BufferedReader(new InputStreamReader(zis, "UTF-8"));
     while ((line = br.readLine()) != null) {
      sbContent.append(line);
     }
    }
   }
   System.out.println(sbContent.toString());

   PrintWriter out = this.response.getWriter();
   out.write(sbContent.toString());
   out.write(new String("数据读取成功！".getBytes(),"UTF-8"));
  } catch (IOException e) {
   e.printStackTrace();
  } finally {
   try {
    if(null!=br)
     br.close();
    zis.close();
    bis.close();
    is.close();
   } catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }
  }
  System.out.println("=== end ===  ");

  return null;

 

 

 

二、下砸压缩文件流（将字符串写入xml中，再压缩后提供下载）：

@SuppressWarnings("deprecation")
 public String GetDelphiFile() {
  this.request = ServletActionContext.getRequest();
  this.response = ServletActionContext.getResponse();
  return SUCCESS;
 }

 final int BUFFER = 1024;

 public InputStream getInputStream() {
  String FILENAME = "gdzc";
  InputStream is=null;
  Document document = DocumentHelper.createDocument();
  Element element = document.addElement("root");
  Element el = element.addElement("record");
  el.addAttribute("id", "1");
  el.addAttribute("name", new String("笔记本电脑"));
  Element record2 = element.addElement("record");
  record2.addAttribute("id", "2");
  record2.addAttribute("name", "办公桌");
  try {   
   byte[] b = document.asXML().getBytes();
   int count;
   
   String url =this.request.getRealPath("");
   //创建xml文件File gdzc = File.createTempFile("gdzc", ".xml");
   url = url.substring(0,url.lastIndexOf("//"));
   String filepath =url.substring(0,url.lastIndexOf("//"));
   File gdzc = new File(filepath+"//temp//"+FILENAME+".xml"); //此临时文件保存路径为服务器tomcat的安装目录下temp 文件夹中
   if(!gdzc.exists()){
    gdzc.createNewFile();
   }
   FileOutputStream fosgdzc = new FileOutputStream(gdzc);
   for (int i = 0; i < b.length; i++) {
    fosgdzc.write(b[i]);//将文本内容写入xml中
   }
   fosgdzc.close();
   
   //创建压缩文件
   File zip = File.createTempFile(FILENAME,".zip");
   FileOutputStream fos = new FileOutputStream(zip);
   ZipOutputStream out = new ZipOutputStream(new BufferedOutputStream(
     fos));
   //创建压缩包内文件
   ZipEntry zEntry = new ZipEntry(gdzc.getName());
   out.putNextEntry(zEntry);
   FileInputStream fis = new FileInputStream(gdzc);
   BufferedInputStream bis = new BufferedInputStream(fis, BUFFER);
   b = new byte[BUFFER];
   while ((count = bis.read(b, 0, BUFFER)) != -1) {
    out.write(b,0,count); //将gdzc.xml写入压缩包中
   }
   is = new FileInputStream(zip);
   bis.close();
   fis.close();
   out.close();
  
   //将zip包写入 inputstream 中
   ServletOutputStream sos = this.response.getOutputStream();
   b= new byte[BUFFER];
   while((count=is.read(b, 0, BUFFER))!=-1){
    sos.write(b,0,BUFFER);
   }
   sos.close();
   //刪除临时文件
   if(gdzc.exists()){
    gdzc.delete();
   }
   if(zip.exists()){
    zip.delete();
   }
   this.response.flushBuffer();
  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
  return is;
 }