1.save
private File newsAttach;
private String newsAttachFileName;
private String newsAttachContentType;
if (newsAttach != null) {
String rp = request.getSession().getServletContext()
.getRealPath("/");
String midPath = "uploadsrc/file/" + System.currentTimeMillis();
String realPath = rp.replaceAll("\\\\", "/") + midPath + "/";
FileUtil.savePic(realPath, getNewsAttachFileName(), newsAttach);
}
2.download
String act= request.getParameter("act");
if (act.equals("downFile")) {
String path = request.getParameter("path");
String rp = request.getSession().getServletContext().getRealPath(
"/");
rp = rp.substring(0, rp.length() - 1);
File picFile = new File(rp + path);
if (picFile != null && picFile.exists()) {
response
.setContentType("application/octet-stream; charset=UTF-8");
try {
response.setHeader("Content-Disposition",
"attachment;filename="
+ java.net.URLEncoder.encode(picFile
.getName(), "UTF-8") + "");
OutputStream out = response.getOutputStream();
//need to import apache commons.io.jar pack
org.apache.commons.io.FileUtils.readFileToByteArray(picFile);
out.write(FileUtils.readFileToByteArray(picFile));
response.flushBuffer();
out.flush();
out.close();
} catch (Exception e) {
e.printStackTrace();
}
}
return null;
}
3.文delete
if (act.equals("delFile")) {
String ret = "";
String path = request.getParameter("path");
String realRoot = request.getSession().getServletContext()
.getRealPath("/");
realRoot = realRoot.substring(0, realRoot.length() - 1);
boolean flag = FileUtil.delFile(realRoot+path);
if (flag) {
ret = "OK";
}
try {
response.getWriter().write(ret);
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
tools class
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.List;
public class FileUtil {
public static void saveFile(String RootPath,List<File> file,List<String> fileFileName) throws Exception{
if (file != null) {
int i = 0;
for (; i < file.size(); i++) {
java.io.InputStream is = new java.io.FileInputStream(file
.get(i));
java.io.OutputStream os = new java.io.FileOutputStream(
RootPath + fileFileName.get(i));
byte buffer[] = new byte[8192];
int count = 0;
while ((count = is.read(buffer)) > 0) {
os.write(buffer, 0, count);
}
os.close();
is.close();
}
}
}
public static void savePic(String newsRootPath, String filename, File picFile) {
try {
File newsFileRoot = new File(newsRootPath);
if (!newsFileRoot.exists()) {
newsFileRoot.mkdirs();
}
FileOutputStream fos = new FileOutputStream(newsRootPath + filename);
FileInputStream fis = new FileInputStream(picFile);
byte[] buf = new byte[1024];
int len = 0;
while ((len = fis.read(buf)) > 0) {
fos.write(buf, 0, len);
}
if (fis != null)
fis.close();
if (fos != null)
fos.close();
} catch (Exception ex) {
ex.printStackTrace();
}
}
public static boolean delFile(String fpath) {
boolean flag = false;
File filePath = new File(fpath);
if (filePath.exists()) {
filePath.delete();
flag = true;
}
return flag;
}
}