文本，文件，图片的上传与下载

来源：互联网发布：体脂称知乎编辑：程序博客网时间：2024/05/16 08:20

<%@ 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>
<form action="FileServlet1" method="post" enctype="multipart/form-data">
用户名：<input type="text" name="username"/>
文件：<input type="file" name="filename"/><br>
<input type="submit" value="上传"/>
</form>
</body>

</html>

package com.zhao.servlet;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.util.List;
import java.util.UUID;

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.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
public class FileServlet1 extends HttpServlet {
public static String subStringnum(String filename){
if(filename!=null&&!"".equals(filename)){
return UUID.randomUUID()+"_"+filename;
}

return null;
}

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
this.doPost(request, response);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
try {
String path=this.getServletContext().getRealPath("/file");
//创建DiskFileItemFactory工厂类的方法
DiskFileItemFactory disk=new DiskFileItemFactory();
//创建ServletFileUpload对象
ServletFileUpload se=new ServletFileUpload(disk);
//处理保存的文件名，防止中文乱码
se.setHeaderEncoding("utf-8");
//解析request对象，将请求对象的TEXT文本域和文件域生成FileItem(form提交过来的所有数据)
List<FileItem> lists=se.parseRequest(request);
for(FileItem fileitem:lists){
//isFormField()区分是文本还是文件
if(fileitem.isFormField()){
String username=fileitem.getFieldName();
//得到提交过来的数据值，并解决乱码问题
String usernamevalue=fileitem.getString("utf-8");
System.out.println(username+":"+usernamevalue);
}else{
//得到传进来文件的名字
String filename=subStringnum(fileitem.getFieldName());
//得到字节流
InputStream inputStream=request.getInputStream();
//将字节流转换成字符流
InputStreamReader inputStreamReader=new InputStreamReader(inputStream);
//将字符流转换成缓冲流，目的使用readLine（）方法
BufferedReader bufferedReader=new BufferedReader(inputStreamReader);
//创建输出文件的地址
File file =new File(path,"mysql.txt");
//创建输出文件的字符流
FileWriter fileWriter=new FileWriter(file);
//将字符流转换成缓冲流，调用write()方法
BufferedWriter bufferedWriter=new BufferedWriter(fileWriter);
String string=null;
//每次读一行输出
while((string=bufferedReader.readLine())!=null){
System.out.println(string);
//写出到指定的路径中
bufferedWriter.write(string);
}
bufferedWriter.flush();
bufferedWriter.close();
inputStream.close();
fileWriter.close();
}
}
} catch (FileUploadException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

}

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