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 

Xml代码  
  
  ant  
  ant  
  1.6.5  
  

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

   资源ant.jar下载地址：http://blog.csdn.net/clare504/article/details/11962263