文件上传 commons-fileupload

最新推荐文章于 2021-06-20 21:55:00 发布

最新推荐文章于 2021-06-20 21:55:00 发布 · 389 阅读

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#文件上传

commons fileupload 实现文件上传专栏收录该内容

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本文介绍了一个使用Java实现的文件上传示例，包括前端表单设计及后端处理流程。通过commons-fileupload和commons-io库，实现了多文件上传功能，并记录了上传者的姓名和日期。

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导入两个jarcommons-fileupload.jar,和commons-io.jar

首先是上传页面

fileupload.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP 'fileUpload.jsp' starting page</title>
</head>

<body>
<form action="../servlet/FileUpload" method="post" enctype="multipart/form-data">
<br>
文件一：<input type="file" name="file1" /> <br>
文件二：<input type="file" name="file2" /> <br>
上传者: <input type="text" name="uploader"/> <br>
日期: <input type="text" name="date"/> <br>
<input type="submit" value="提交"/>

</form>
</body>
</html>

传如servlet 处理

public class FileUpload extends HttpServlet {

private static final long serialVersionUID = 1L;
private static final String fileDir = "F:/";

/**
* Constructor of the object.
*/
public FileUpload() {
super();
}

/**
* Destruction of the servlet. <br>
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}

public void doGet(HttpServletRequest request, HttpServletResponse response)
doPost();

}

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

//设置编码
response.setContentType("text/html");
request.setCharacterEncoding("UTF-8");
response.setCharacterEncoding("UTF-8");

//核心代码
try {
DiskFileItemFactory fileFactory = new DiskFileItemFactory(); //产生工厂
ServletFileUpload fu = new ServletFileUpload(fileFactory); //调用工具
fu.setFileSizeMax(30*1024*1024); //设置文件大小限制

List fileItems = fu.parseRequest(request);    // 获取请求项
Iterator iter = fileItems.iterator();
String uploader = null;
String date = null;
List<String> fileNames = new ArrayList<String>();
while (iter.hasNext()) {
FileItem item = (FileItem) iter.next();

if (!item.isFormField()) { // 判断文件
String oldFileName = item.getName();
String fieldName = item.getFieldName();
String content = item.getString();
String type = item.getContentType();

String newFileName = null;
// System.out.println("fileName :" +oldFileName +" and fileName : "+ fieldName + " and content :" + content + " and type "+ type);
int delimiter = oldFileName.lastIndexOf("/");
// System.out.println(delimiter);

if (delimiter == -1) {
newFileName = oldFileName.substring(delimiter + 1);
System.out.println(newFileName);
}else{
newFileName = oldFileName;
}
if(newFileName != null && !newFileName.trim().equals("")){
fileNames.add(newFileName);
item.write(new File(fileDir + "first.txt"));    // 设置写入地址，自己设定
}
} else { // 表单
String fieldName = item.getFieldName();
if ("uploader".equals(fieldName)) {
uploader = item.getString();
} else if ("date".equals(fieldName)) {
date = item.getString();
}
}
}

System.out.println("forword");
// request.setAttribute("fileNames",fileNames);
// request.getRequestDispatcher("../admin/fileUploadResult.jsp").forward(request, response); // 后续处理
} catch (Exception e) {

}
}

/**
* Initialization of the servlet. <br>
*
* @throws ServletException if an error occurs
*/
public void init() throws ServletException {
// Put your code here
}

}