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>	

压缩下载的action代码

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