Java批量檔案打包下載
阿新 • • 發佈：2019-02-07
經常遇到選擇多個檔案進行批量下載的情況，可以先將選擇的所有的檔案生成一個zip檔案，然後再下載，該zip檔案，即可實現批量下載，但是在打包過程中，常常也會出現下載過來的zip檔案中裡面有亂碼的檔名，通過使用ant.jar中的org.apache.tools.zip裡的ZipOutPutStream為實現編碼的設定。
程式碼如下：
壓縮下載的action程式碼
程式碼如下：
ant包引用
Xml程式碼
<dependency>
<groupId>ant</groupId>
<artifactId>ant</artifactId>
<version>1.6.5</version>
</dependency> 壓縮下載的action程式碼
package demo.action;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URLEncoder;
import javax.servlet.http.HttpServletResponse;
import org.apache.log4j.Logger;
import org.apache.struts2.ServletActionContext;
import org.apache.tools.zip.ZipEntry;
import org.apache.tools.zip.ZipOutputStream;
import com.opensymphony.xwork2.ActionSupport;
/**
* 批量下載檔案：
* 使用ant.jar包中的org.apache.tools.zip.*完成壓縮，
* java原生也有java.util.zip.*但是測試了下無法搞定壓縮
* 檔案內檔名的中文問題
* @author yangcong
*
*/
public class BatchDownloadAction extends ActionSupport {
private Logger Log = Logger.getLogger(BatchDownloadAction.class);
private static final String FilePath = "D:\\";
private static final long serialVersionUID = -8694640030455344419L;
public String execute() {
//生成的ZIP檔名為Demo.zip
String tmpFileName = "Demo.zip";
byte[] buffer = new byte[1024];
String strZipPath = FilePath + tmpFileName;
try {
ZipOutputStream out = new ZipOutputStream(new FileOutputStream(
strZipPath));
// 需要同時下載的兩個檔案result.txt ，source.txt
File[] file1 = { new File(FilePath+"test1.txt"),
new File(FilePath+"測試2.docx") };
for (int i = 0; i < file1.length; i++) {
FileInputStream fis = new FileInputStream(file1[i]);
out.putNextEntry(new ZipEntry(file1[i].getName()));
//設定壓縮檔案內的字元編碼，不然會變成亂碼
out.setEncoding("GBK");
int len;
// 讀入需要下載的檔案的內容，打包到zip檔案
while ((len = fis.read(buffer)) > 0) {
out.write(buffer, 0, len);
}
out.closeEntry();
fis.close();
}
out.close();
this.downFile(getResponse(), tmpFileName);
} catch (Exception e) {
Log.error("檔案下載出錯", e);
}
return null;
}
/**
* 獲取Response
* @return
*/
private HttpServletResponse getResponse() {
return ServletActionContext.getResponse();
}
/**
* 檔案下載
* @param response
* @param str
*/
private void downFile(HttpServletResponse response, String str) {
try {
String path = FilePath + str;
File file = new File(path);
if (file.exists()) {
InputStream ins = new FileInputStream(path);
BufferedInputStream bins = new BufferedInputStream(ins);// 放到緩衝流裡面
OutputStream outs = response.getOutputStream();// 獲取檔案輸出IO流
BufferedOutputStream bouts = new BufferedOutputStream(outs);
response.setContentType("application/x-download");// 設定response內容的型別
response.setHeader(
"Content-disposition",
"attachment;filename="
+ URLEncoder.encode(str, "UTF-8"));// 設定頭部資訊
int bytesRead = 0;
byte[] buffer = new byte[8192];
// 開始向網路傳輸檔案流
while ((bytesRead = bins.read(buffer, 0, 8192)) != -1) {
bouts.write(buffer, 0, bytesRead);
}
bouts.flush();// 這裡一定要呼叫flush()方法
ins.close();
bins.close();
outs.close();
bouts.close();
} else {
response.sendRedirect("../error.jsp");
}
} catch (IOException e) {
Log.error("檔案下載出錯", e);
}
}
}
經過在windows環境下測試通過，使用struts2