common-fileupload实现文件上传功能

1.要实现common-fileupload实现文件上传功能，要在项目下面导入common-fileupload和common-io两个jar包。

2.upload.jsp

代码如下：

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Insert title here</title>
<script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.min.js"></script>
</head>
<script type="text/javascript">
	function uploadmethod(){
		var formData=new FormData();
		formData.append('file',$('#file')[0].files[0]);
		$.ajax({
		    url: 'uploadServlet.do',
		    type: 'POST',
		    cache: false,
		    data: formData,
		    dataType:"json",
		    processData: false,
		    contentType: false
		}).done(function(res) {console.log(res);}).fail(function(res) {});
	
	}
</script>
<body>
<form id="uploadForm" enctype="multipart/form-data">
    <input id="file" type="file" name="file"/>
    <img alt="" src="">
    <button onclick="uploadmethod()" id="upload" type="button">upload</button>
</form>
</body>
</html>

3.UploadServlet.java

代码如下：

package com.dfrz.servlet;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.List;

import javax.servlet.ServletException;
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.FileItemFactory;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

public class UploadServlet extends HttpServlet {
	protected void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		response.setContentType("text/html;charset=UTF-8");
		PrintWriter out = response.getWriter();
		// 使用common-filepload进行处理上传内容
		FileItemFactory factory = new DiskFileItemFactory();
		ServletFileUpload fileUpload = new ServletFileUpload(factory);
		// factory工厂 ， FileItem是单个文件
		System.out.println(111);
		try {
			//parseRequest(request)需要导入带有common的包，不然会报错
			List<FileItem> files = fileUpload.parseRequest(request);
			for (FileItem fileItem : files) {
				// 文件名
				System.out.println(fileItem.getName());
				System.out.println(fileItem.getSize());
				System.out.println(fileItem.getContentType());
				// 进行文件写到服务器磁盘

				// 获取服务器路径
				String parentDir = this.getServletContext().getRealPath("/upload");
				// 如果服务器没有upload路径，要创建文件夹
				File file = new File(parentDir, fileItem.getName());
				if (!file.getParentFile().exists()) {
					file.getParentFile().mkdir();
				}
				// 进行文件写到服务器磁盘 IO读写
				InputStream is = fileItem.getInputStream();

				OutputStream os = new FileOutputStream(file);
				byte[] buf = new byte[1024];
				int len = -1;
				while ((len = is.read(buf)) != -1) {
					os.write(buf, 0, len);
				}
				// 关闭流
				os.close();
				is.close();
				out.println("{\"status\":\"1\",\"fpath\":\"" + fileItem.getName() + "\"}");
			}
		} catch (FileUploadException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

	}
}

4.其中，文件保存在自己设置的根目录下。实在找不到的话，可以在String parentDir = this.getServletContext().getRealPath("/upload");处设置一个断点，然后查看文件所保存在哪里。

common-fileupload实现文件上传功能

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