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
<dependency> <groupId>ant</groupId> <artifactId>ant</artifactId> <version>1.6.5</version></dependency>
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.zipString 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.txtFile[] 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);}}}