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文件下载/*
* 下载文件
*/
public void downloadFile(String proname, String fileName, HttpServletResponse resp) {
try {
ProjectEntity projectEntity = projectMapping.getProjectByName(proname);
ProductEntity productEntity = productMapping.getProductByProductId(projectEntity.getProProductId());
ProductOutsourceEntity productOutsourceEntity = productOutsourceMapping.getProductOutsourceByOutId(productEntity.getOutId());
//获取文件名
String strUrl = productOutsourceEntity.getFileUrl();
String filename = strUrl.substring(strUrl.lastIndexOf("/")+1);
filename = new String(filename.getBytes("iso8859-1"),"UTF-8");
String path = strUrl;
File file = new File(path);
//如果文件不存在
if(!file.exists()){
log.info("下载文件不存在");
}
//解决下载文件时文件名乱码问题
byte[] fileNameBytes = filename.getBytes(StandardCharsets.UTF_8);
filename = new String(fileNameBytes, 0, fileNameBytes.length, StandardCharsets.ISO_8859_1);
resp.reset();
resp.setContentType("application/octet-stream");
resp.setCharacterEncoding("utf-8");
resp.setContentLength((int) file.length());
//设置响应头，控制浏览器下载该文件
resp.setHeader("content-disposition", "attachment;filename=" + filename);
try{
//读取要下载的文件，保存到文件输入流
BufferedInputStream bis = new BufferedInputStream(new FileInputStream(path));
//创建输出流
OutputStream os = resp.getOutputStream();
//缓存区
byte[] buff = new byte[1024];
int i = 0;
//循环将输入流中的内容读取到缓冲区中
while ((i = bis.read(buff)) != -1) {
os.write(buff, 0, i);
os.flush();
}
//关闭
bis.close();
os.close();
} catch (IOException e) {
log.error("{}",e);
log.info("下载失败");
}
log.info("下载成功");
} catch (Exception e) {
// TODO 自动生成的 catch 块
e.printStackTrace();
}
}
文件夹下载 与文件下载不一样，需要先压缩再下载。本例子的服务器中文件URL已知，所以未用mapping层查询数据库，可根据需要加上。
Service:/*
* 下载文件夹
*/
public void downloadFile(String proname, String fileName, HttpServletResponse resp) {
try {
//下载后的文件
String name=Constants.FILEPATH + Constants.PROJECT + proname + "/product/outsource"+".zip";
zipUtil zc = new zipUtil(name);
List list=new ArrayList();
//服务器存储的URL
list.add(Constants.FILEPATH + Constants.PROJECT + proname + "/product/outsource");
//可继续添加要一起压缩的文件夹或文件
//list.add("");
String[] strings = new String[list.size()];
list.toArray(strings);
File file=null;
try {
zc.compress(strings);//压缩
file=new File(name);
downLoad.downloadZip(file,resp);//下载
} catch (IOException e) {
e.printStackTrace();
}finally {
if(file!=null){
file.delete();//把生成的压缩文件删除
}
}
} catch (Exception e) {
// TODO 自动生成的 catch 块
e.printStackTrace();
}
}
Utile:建立两个工具包
（1）压缩文件夹
public class ZipCompressorUtil {
static final int BUFFER = 8192;
/**
* 压缩的文件夹
*/
private File zipFile1111;
public ZipCompressorUtil(String pathName) {
zipFile1111 = new File(pathName);
}
/**
* 遍历需要压缩文件集合
* @param pathName
* @throws IOException
*/
public void compress(String... pathName) throws IOException {
ZipOutputStream out =null;
FileOutputStream fileOutputStream=null;
CheckedOutputStream cos=null;
try {
fileOutputStream = new FileOutputStream(zipFile1111);
cos = new CheckedOutputStream(fileOutputStream,new CRC32());
out = new ZipOutputStream(cos);
String basedir = "";
for (int i=0;i |