JAVA struts2框架下zip打包文件下载

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用ant.jar中apache.tools中的ZipOutputStream来作为出入流（可能会有其他外层修饰），以byteArrayInputStream来作为输入流。

上代码：

action代码：

//代理下载public String agentDownload(){int dataSourceId = LoginInfo.getLoginUser().getDataSourceId();adminService = new AdminBLL(dataSourceId);String root = ServletActionContext.getServletContext().getRealPath("\\");String srcPath = root + "softs"+ File.separator+"Chart.js-master.zip";File file = new File(srcPath);input = adminService.downloadAgent(file);setAgentName("agent1.2");setMf("adm_monitor");return "agentDownload";}

业务代码：

public InputStream downloadAgent(File file){InputStream input = null;ByteArrayOutputStream out = new ByteArrayOutputStream();CheckedOutputStream cos = new CheckedOutputStream(out, new CRC32());ZipOutputStream zip = new ZipOutputStream(cos);ZipEntry entry = new ZipEntry(file.getName());InputStream is = null;try {zip.putNextEntry(entry);is = new BufferedInputStream(new FileInputStream(file));int buffer = 2048;byte[] data = new byte[buffer];int k;while( (k = is.read(data, 0, buffer)) != -1){zip.write(data, 0, k);}zip.flush();zip.closeEntry();} catch (IOException e) {e.printStackTrace();}finally{try {if(zip != null){zip.close();//必须要关闭，不然会出错input  = new ByteArrayInputStream(out.toByteArray());}if(is != null){is.close();}} catch (IOException e){e.printStackTrace();}}return input;}

注意点：

1、zip.flush()\zip.closeEntry()\zip.close()；方法一定要调用，在调用close()方法后，才能开始转入输入流。

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