我的网页上有一个下载按钮，当我点击它时，它会下载一个zip文件。现在我希望有一个功能，当我点击下载按钮时，zip文件应该自动提取并保存在用户定义的文件夹中。
我知道如果我们可以创建一个exe文件并将其添加到下载按钮，那么它应该自动提取zip文件并保存在文件夹中
%>
<td align="center">
<img onclick="pullReport('<%=reportPath.toString()%>');" title="Click to download this Report" src="./images/down-bt.gif"/>
</td>
</tr>
<%} %>
这是创建zip文件的方法
public ActionForward pullReport(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response)throws SQLException{
Connection connection=null;
boolean cont=false;
failureList.clear();
logger.info("dispatch = pullReport");
String filePaths=null;
String filePath = null;
String fileName = null;
String srcFileName = null;
String directory = null;
try{
Properties props = Application.getProperties();
String basePath = props.getProperty("std.report_location");
logger.info(" basepath " + basePath);
connection=ConnectionManager.getConnection();
StandardReportsForm standardReportsForm=(StandardReportsForm)form;
filePaths=standardReportsForm.getFilePath();
logger.info("filepaths " + filePaths);
ServletOutputStream fos = null;
InputStream is = null;
String [] filePathArr = filePaths.split(",");
FileIO fio = null;
FileIO srcFio = null;
if (filePathArr.length > 1) {
filePath = filePathArr[0].substring(0,filePathArr[0].lastIndexOf("."))+".zip";
logger.info(filePath + " creating zip file ......");
directory = basePath+filePath.substring(0,filePath.lastIndexOf('/'));
logger.info( " Direcory Name :" +directory);
fileName = filePath.substring(filePath.lastIndexOf('/')+1);
logger.info( " File Name :" +fileName);
fio = new FileIO(directory,fileName);
fio.mkDir();
byte[] buffer = new byte[1024];
OutputStream fosForZip = fio.createOutputStream();
ZipOutputStream zos = new ZipOutputStream(fosForZip);
InputStream fis = null;
for (int i=0; i < filePathArr.length; i++) {
srcFileName = filePathArr[i].substring(filePathArr[i].lastIndexOf('/')+1);
srcFio = new FileIO(directory,srcFileName);
if (srcFio.isFileExist()) {
cont=true;
logger.info(" adding into zip file " +srcFileName);
fis = srcFio.createInputStream();
BufferedInputStream bis = new BufferedInputStream(fis);
zos.putNextEntry(new ZipEntry(srcFileName));
int length;
while ((length = bis.read(buffer)) != -1) {
zos.write(buffer, 0, length);
}
zos.closeEntry();
// close the InputStream
bis.close();
srcFio.closeInputStream(fis);
} else {
logger.info(srcFileName + " file does not exist on shared drive");
cont =false;
break;
}
}
FileIO.closeOutputStream(zos);
if (!cont){
standardReportsForm.setMissingFileName(srcFileName);
request.getSession().getAttribute("fetchReports");
standardReportsForm.setFetchedReports((List<ReportDetails>)request.getSession().getAttribute("fetchReports"));
return mapping.findForward("fetchReport");
}
} else {
filePath = filePathArr[0];
fileName = filePath.substring(filePath.lastIndexOf('/')+1);
}
if (basePath.startsWith("smb")) {
SmbFile smbFile = new SmbFile(basePath+filePath,SMBHelper.getInstance().createAuthFromSmbLocation(basePath));
if(smbFile.exists())
{
is = new SmbFileInputStream(smbFile);
cont=true;
}
} else {
File file=new File(basePath+filePath);
if(file.exists())
{
is = new FileInputStream(file);
cont=true;
}
}
if(cont)
{
fos=response.getOutputStream();
setContentType(response, fileName);
//fos.write (baos.toByteArray());
ByteArrayOutputStream bos = new ByteArrayOutputStream();
byte[] buf = new byte[1024];
for (int readNum; (readNum = is.read(buf)) != -1;) {
bos.write(buf, 0, readNum);
}
byte[] bytes = bos.toByteArray();
fos.write(bytes);
fos.flush();
fos.close();
} else {
standardReportsForm.setMissingFileName(fileName);
request.getSession().getAttribute("fetchReports");
standardReportsForm.setFetchedReports((List<ReportDetails>)request.getSession().getAttribute("fetchReports"));
return mapping.findForward("fetchReport");
}
}catch(SQLException sx) {
logger.error(" error log SQLException " ,sx);
failureList.add(new UROCException(UROCMessages.getMessage("ERR_CONN_EXEC"), sx));
} catch(NamingException ne) {
logger.info("RMI error is "+ne);
failureList.add(new UROCException(UROCMessages.getMessage("ERR_NAMING_EXEC"), ne));
} catch(Exception e) {
logger.error(" error log Exception " ,e);
failureList.add(new UROCException(UROCMessages.getMessage("ERR_GEN_EXEC", new String[] {"General Exception"}), e));
} finally {
SQLHelper.closeConnection(connection, failureList, logger);
}
return null;
}
答案 0 :(得分：0)
是的，您可以使用java代码解压缩文件。这是示例
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
public class UnzipUtility {
public String zipFilePath= "D:/javatut/corejava/src/zipfile.zip";
public String destDir = "D:/javatut/corejava";
private static final int BUFFER_SIZE = 4096;
/**
* @param args
* @throws IOException
*/
public static void main(String[] args) throws IOException {
UnzipUtility uu = new UnzipUtility();
uu.unzip(uu.zipFilePath, uu.destDir);
}
public void unzip(String zipFilePath,String destDir)throws IOException{
File destDirectory = new File(destDir);
if(!destDirectory.exists()){
destDirectory.mkdir();
}
ZipInputStream zipIn = new ZipInputStream(new FileInputStream(zipFilePath));
ZipEntry zipEntry = zipIn.getNextEntry();
while(zipEntry!=null){
String filePath=destDir+File.separator+zipEntry.getName();
if(!zipEntry.isDirectory()){
extractFile(zipIn,filePath);
}
else{
File dir = new File(filePath);
dir.mkdir();
}
zipIn.closeEntry();
zipEntry = zipIn.getNextEntry();
}
zipIn.close();
}
private void extractFile(ZipInputStream zipIn, String filePath) throws FileNotFoundException {
BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(filePath));
byte[] bytesIn = new byte[BUFFER_SIZE];
int read = 0;
try {
while ((read = zipIn.read(bytesIn)) != -1) {
bos.write(bytesIn, 0, read);
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
bos.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}