form表单文件上传 servlet文件接收

需要导入jar包

Upload.Jsp代码

复制代码

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
    "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>$title$/title>
</head>
<body>
<form method="post" action="/test/UploadServlet" enctype="multipart/form-data">
    选择一个文件:
    <input type="file" name="uploadFile" />
    <br/><br/>
    <input type="submit" value="上传" />
</form>
</body>
</html>

复制代码

servlet接收文件代码

100

import java.io.File;

import java.io.IOException;

import java.io.PrintWriter;

import java.util.List;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.FileItem;

import org.apache.commons.fileupload.disk.DiskFileItemFactory;

import org.apache.commons.fileupload.servlet.ServletFileUpload;

@WebServlet("/UploadServlet")

public class UploadServlet extends HttpServlet {

private static final long serialVersionUID = 1L;

// 上传文件存储目录

private static final String UPLOAD_DIRECTORY = "upload";

// 上传配置

private static final int MEMORY_THRESHOLD = 1024 * 1024 * 3; // 3MB

private static final int MAX_FILE_SIZE = 1024 * 1024 * 40; // 40MB

private static final int MAX_REQUEST_SIZE = 1024 * 1024 * 50; // 50MB

/**

* 上传数据及保存文件

*/

protected void doPost(HttpServletRequest request,

HttpServletResponse response) throws ServletException, IOException {

// 检测是否为多媒体上传

if (!ServletFileUpload.isMultipartContent(request)) {

// 如果不是则停止

PrintWriter writer = response.getWriter();

writer.println("Error: 表单必须包含 enctype=multipart/form-data");

writer.flush();

return;

}

// 配置上传参数

DiskFileItemFactory factory = new DiskFileItemFactory();

// 设置内存临界值 - 超过后将产生临时文件并存储于临时目录中

factory.setSizeThreshold(MEMORY_THRESHOLD);

// 设置临时存储目录

factory.setRepository(new File(System.getProperty("java.io.tmpdir")));

ServletFileUpload upload = new ServletFileUpload(factory);

// 设置最大文件上传值

upload.setFileSizeMax(MAX_FILE_SIZE);

// 设置最大请求值 (包含文件和表单数据)

upload.setSizeMax(MAX_REQUEST_SIZE);

// 构造临时路径来存储上传的文件

// 这个路径相对当前应用的目录

String uploadPath = getServletContext().getRealPath("./") + File.separator + UPLOAD_DIRECTORY;

// 如果目录不存在则创建

File uploadDir = new File(uploadPath);

if (!uploadDir.exists()) {

uploadDir.mkdir();

}

try {

// 解析请求的内容提取文件数据

@SuppressWarnings("unchecked")

List<FileItem> formItems = upload.parseRequest(request);

if (formItems != null && formItems.size() > 0) {

// 迭代表单数据

for (FileItem item : formItems) {

// 处理不在表单中的字段

if (!item.isFormField()) {

String fileName = new File(item.getName()).getName();

String filePath = uploadPath + File.separator + fileName;

File storeFile = new File(filePath);

// 在控制台输出文件的上传路径

System.out.println(filePath);

// 保存文件到硬盘

item.write(storeFile);

request.setAttribute("message",

"文件上传成功!");

}

} catch (Exception ex) {

request.setAttribute("message",

"错误信息: " + ex.getMessage());

}

// 跳转到 message.jsp

getServletContext().getRequestDispatcher("/message.jsp").forward(

request, response);

}

Servlet3.0新特性：

import org.apache.catalina.core.ApplicationPart;

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.IOException;

import java.io.PrintWriter;

/**

* Created by IMP on 2016/9/9.

*/

@WebServlet("UploadServlet")

@MultipartConfig(location = "D://")

public class UploadServlet extends HttpServlet {

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

doGet(request, response);

}

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

response.setContentType("text/html;charset=UTF-8");

PrintWriter out=response.getWriter();

String path=this.getServletContext().getRealPath("/");

Part p=request.getPart("file1");

if(p.getContentType().contains("image")){

ApplicationPart ap= (ApplicationPart) p;

String fname1=ap.getSubmittedFileName();

int path_idx=fname1.lastIndexOf("\\")+1;

String fname2=fname1.substring(path_idx,fname1.length());

p.write(path+"/upload/"+fname2);

out.write("文件上传成功");

}else{

out.write("请选择图片文件");

}

form表单文件上传 servlet文件接收

猜你喜欢