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Java批量文件打包下载
经常遇到选择多个文件进行批量下载的情况,可以先将选择的所有的文件生成一个zip文件,然后再下载,该zip文件,即可实现批量下载,但是在打包过程中,常常也会出现下载过来的zip文件中里面有乱码的文件名,通过使用ant.jar中的org.apache.tools.zip里的ZipOutPutStream为实现编码的设置。
代码如下:
ant包引用
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- <span style="font-size:14px">Xml代码
- <dependency>
- <groupId>ant</groupId>
- <artifactId>ant</artifactId>
- <version>1.6.5</version>
- </dependency> </span>
压缩下载的action代码
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- <span style="font-size:14px">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;
- /**
- * 批量下载文件:
- * 使用ant.jar包中的org.apache.tools.zip.*完成压缩,
- * java原生也有java.util.zip.*但是测试了下无法搞定压缩
- * 文件内文件名的中文问题
- * @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文件名为Demo.zip
- String tmpFileName = "Demo.zip";
- byte[] buffer = new byte[1024];
- String strZipPath = FilePath + tmpFileName;
- try {
- ZipOutputStream out = new ZipOutputStream(new FileOutputStream(
- strZipPath));
- // 需要同时下载的两个文件result.txt ,source.txt
- File[] file1 = { new File(FilePath+"test1.txt"),
- new File(FilePath+"测试2.docx") };
- for (int i = 0; i < file1.length; i++) {
- FileInputStream fis = new FileInputStream(file1[i]);
- out.putNextEntry(new ZipEntry(file1[i].getName()));
- //设置压缩文件内的字符编码,不然会变成乱码
- out.setEncoding("GBK");
- int len;
- // 读入需要下载的文件的内容,打包到zip文件
- 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("文件下载出错", e);
- }
- return null;
- }
- /**
- * 获取Response
- * @return
- */
- private HttpServletResponse getResponse() {
- return ServletActionContext.getResponse();
- }
- /**
- * 文件下载
- * @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);// 放到缓冲流里面
- OutputStream outs = response.getOutputStream();// 获取文件输出IO流
- BufferedOutputStream bouts = new BufferedOutputStream(outs);
- response.setContentType("application/x-download");// 设置response内容的类型
- response.setHeader(
- "Content-disposition",
- "attachment;filename="
- + URLEncoder.encode(str, "UTF-8"));// 设置头部信息
- int bytesRead = 0;
- byte[] buffer = new byte[8192];
- // 开始向网络传输文件流
- while ((bytesRead = bins.read(buffer, 0, 8192)) != -1) {
- bouts.write(buffer, 0, bytesRead);
- }
- bouts.flush();// 这里一定要调用flush()方法
- ins.close();
- bins.close();
- outs.close();
- bouts.close();
- } else {
- response.sendRedirect("../error.jsp");
- }
- } catch (IOException e) {
- Log.error("文件下载出错", e);
- }
- }
- }
- 经过在windows环境下测试通过,使用struts2</span>
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- <span style="font-size:14px"> 资源ant.jar下载地址:<a target="_blank" href=http://www.mamicode.com/"http://blog.csdn.net/clare504/article/details/11962263">http://blog.csdn.net/clare504/article/details/11962263</a></span>
http://blog.csdn.net/clare504/article/details/11962263/
Java批量文件打包下载
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