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Servlet 实现文件上传需要先接收request 发送请求的文件域,然后获取需要上传文件的名字,之后设置文件的存放地址,然后通过
注意事项
Servlet:
import javax.servlet.ServletException;import javax.servlet.annotation.MultipartConfig;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.Part;import java.io.File;import java.io.IOException;@WebServlet("/FileUploadServlet")@MultipartConfigpublic class FileUploadServlet extends HttpServlet { @Override protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { req.setCharacterEncoding("utf-8"); resp.setContentType("text/html;charset=UTF-8"); //创建文件域 Part part = req.getPart("pic"); //获取文件名字 String fileName = part.getSubmittedFileName(); //重命名文件 String newFilename = System.currentTimeMillis()+fileName.substring(fileName.lastIndexOf(".")); //设置文件存取路径 String filePath = this.getServletContext().getRealPath("/"); filePath = filePath.substring(0,filePath.lastIndexOf("w"))+"upload/"; this.getServletContext().log("上传路径为:" + filePath); //创建目录 File f = new File(filePath); //上传文件 if (!f.exists()) f.mkdirs(); part.write(filePath + "/" + newFilename); }}
前端:
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