Java批量文件打包下载

转载自：http://superseven.iteye.com/blog/1187578

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。 

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);
}
}

}

没有找到这个方法

 //设置压缩文件内的字符编码，不然会变成乱码  

                out.setEncoding("GBK");  

我没有设置也没有乱码也就没有去管