commons-fileupload文件上传
@WebServlet("/upload")
public class FileUploadServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
req.getRequestDispatcher("upload.jsp").forward(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//文件保存路径
File saveDir = new File("D:/upload");
if (!saveDir.exists()) {
saveDir.mkdir();
}
//文件缓存路径
File tempDir = new File("D:/tp");
if (!tempDir.exists()) {
tempDir.mkdir();
}
//判断表单是否有entype属性
if (ServletFileUpload.isMultipartContent(req)) {
DiskFileItemFactory itemFactory = new DiskFileItemFactory();
itemFactory.setSizeThreshold(1024);//设置缓冲区大小
itemFactory.setRepository(tempDir);//设置临时文件路径
//获取ServletFileUpload对象，设置文件最大上传大小
ServletFileUpload servletFileUpload = new ServletFileUpload(itemFactory);
servletFileUpload.setFileSizeMax(1024 * 1024 * 10);
try {
//获取所有表单元素（普通元素+文件元素）返回值为FileItem对象数组
List<FileItem> fileItemList = servletFileUpload.parseRequest(req);
for (FileItem fileItem : fileItemList) {
if (fileItem.isFormField()) {
//普通元素
System.out.println("getFieldName ->" + fileItem.getFieldName());//获取普通元素name属性的值
System.out.println("getString ->" + fileItem.getString("UTF-8"));//获取普通元素文本框输入的值
} else {
//文件元素
System.out.println("getFieldName ->" + fileItem.getFieldName());//获取文件元素name属性的值
System.out.println("getName ->" + fileItem.getName());//获取文件的初始名
String uuid = UUID.randomUUID().toString();
String name = uuid + fileItem.getName().substring(fileItem.getName().lastIndexOf("."));
//获取文件输入流
InputStream inputStream = fileItem.getInputStream();
FileOutputStream outputStream = new FileOutputStream(new File(saveDir, name));
IOUtils.copy(inputStream, outputStream);
/* byte[] buffer = new byte[1024];
int len = -1;
while ((len = inputStream.read(buffer))!=-1){
outputStream.write(buffer,0,len);
}*/
outputStream.flush();
outputStream.close();
inputStream.close();
System.out.println("上传成功");
}
}
} catch (FileUploadException e) {
e.printStackTrace();
}
} else {
System.out.println("文件上传失败");
}
}
}
jsp代码
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<%--文件上传method方法必须为post
enctype属性值必须为multipart/form-data--%>
<form action="/upload" method="post" enctype="multipart/form-data">
<input type="text" name="desc"> <br>
<input type="file" name="file"> <br>
<button>上传</button>
</form>
</body>
</html>
Servlet3文件上传
@WebServlet("/upload2")
@MultipartConfig
public class FileUploadServlet2 extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
req.getRequestDispatcher("upload2.jsp").forward(req,resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
req.setCharacterEncoding("UTF-8");
String desc = req.getParameter("dasc");
//通过name属性获取Part对象
Part part = req.getPart("file");
System.out.println("getname ->"+part.getName());//name属性值
System.out.println("ContentType ->"+part.getContentType());//文件的MIME类型
System.out.println("Size ->"+part.getSize());//文件大小（字节）
System.out.println("SubmittedFileName ->"+part.getSubmittedFileName());//文件上传名字
FileUtils.byteCountToDisplaySize(part.getSize());
File saveDir = new File("D:/upload");
if(saveDir.exists()){
saveDir.mkdir();
}
String fileName = part.getSubmittedFileName();
String uuid = UUID.randomUUID().toString();
String name = uuid + fileName.substring(fileName.lastIndexOf("."));
InputStream inputStream = part.getInputStream();
FileOutputStream outputStream = new FileOutputStream(new File(saveDir,name));
IOUtils.copy(inputStream,outputStream);
outputStream.flush();
outputStream.close();
inputStream.close();
System.out.println("成功");
}
}
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