注意事项
- POST请求可以传输二进制数据,而GET只能传输文本信息
- form表单标签中声明属性 enctype="multipart/form-data"
- 给Servlet添加注解@MultipartConfig,开启Servlet3.0文件上传组件开关
Servlet实现
@WebServlet(name = "UploadServlet",value = "/upload")
@MultipartConfig
public class UploadServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doGet(request, response);
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("UTF-8");
String nickname = request.getParameter("nickname");
//文件上传
Part filePart = request.getPart("headIcon");
String header = filePart.getHeader("Content-Disposition");
String fileName = this.getFileName(header);
fileName = new Date().getTime() + fileName;
//获取保存上传文件的文件夹的真实物理路径
String uploadDir = this.getServletContext().getRealPath("/upload");
//构建上传文件的完整路径
String fileFullPath = uploadDir + File.separator + fileName;
//输出文件
filePart.write(fileFullPath);
}
private String getFileName(String headerInfo){
String[] arr = headerInfo.split("\"");
return arr[arr.length - 1];
}
Html示例
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<form action="upload" method="post" enctype="multipart/form-data">
昵称:<input type="text" name="nickname"><br><br>
头像:<input type="file" name="headIcon"><br><br>
<input type="submit" value="提交">
</form>
</body>
</html>
