直接上代碼了
一、上傳界面
<%@ 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>Insert title here</title>
</head>
<body>
<!-- 文件上傳對錶單的要求
1、表單中的請求和提交的方式必須是post
2、 表單中應該指定提交的請求爲multipart 請求 ,通過在form表單中添加enctype屬性
爲multipart/form-data
3、表單中要有file元素
-->
<!-- ${pageContext.request.contextPath}/registerServlet -->
<form action="${pageContext.request.contextPath }/registerServlet" method="post" enctype="multipart/form-data">
姓名:<input type="text" name="name" /><br>
<hr>
年齡:<input type="text" name="age" /><br>
<hr>
照片 :<input type="file" name="photo"/>
<br>
<hr>
<input type="submit" value="註冊">
<hr>
</form>
</body>
</html>
二、Servlet處理
package com.ui.servlet;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
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;
import org.apache.tomcat.jni.OS;
import com.mysql.jdbc.Field;
/**
* Servlet implementation class RegisterServlet
*/
@WebServlet("/registerServlet")
public class RegisterServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
if(!ServletFileUpload.isMultipartContent(request))
{
throw new RuntimeException("當前不支持文件上傳");
}
try {
DiskFileItemFactory factory=new DiskFileItemFactory();
//設置使用臨時文件的邊界值，大魚該值得文件上傳會先保存在臨時文件中，否則上傳文件會直接寫入到內存當中去
//單位 字節 在這裏設置的爲1m
factory.setSizeThreshold(1024*1024*1);
//設置臨時文件
String temppath=this.getServletContext().getRealPath("/temp");
File file2=new File(temppath);
factory.setRepository(file2);
//創建文件上傳核心組件
ServletFileUpload fileUpload=new ServletFileUpload(factory);
//設置單個文件的大小不超過多少
fileUpload.setFileSizeMax(1024*1024*2);
//上傳多個文件的要求總的大小不超過多少
fileUpload.setSizeMax(1024*1024*5);
fileUpload.setHeaderEncoding("utf-8");
//設置每一個item的字符編碼爲utf-8
List<FileItem> items=fileUpload.parseRequest(request);
for (FileItem fileItem : items) {
if(fileItem.isFormField())
{
String filename=fileItem.getFieldName();
String fileValue=fileItem.getString("utf-8");
System.out.println(filename+"----"+fileValue);
}
else //如果是文件上傳表單項
{
String filename=fileItem.getName();
InputStream inputStream=fileItem.getInputStream();
//獲取表單項的輸入流
String path=this.getServletContext().getRealPath("/fileContents");
File file=new File(path,filename);
OutputStream outputStream=new FileOutputStream(file);
int len=-1;
byte[] bs=new byte[1024];
while((len=inputStream.read(bs))!=-1)
{
outputStream.write(bs,0,len);
}
outputStream.close();
inputStream.close();
//刪除臨時文件
fileItem.delete();
}
}
}
catch (Exception e) {
// TODO: handle exception
System.out.println(e);
}
}
}
三、實現結果
