java文件上传（解析request流）

来源：互联网发布：linux和openwrt 编辑：程序博客网时间：2024/04/30 17:01

无聊看nio的socket操作，看到了socket文件传输想到之前做文件上传一直是用apache fileupload的组件，也没有考虑过为什么直接从request里取不出文件，现在想来原来是只有从request中得到io流才能进行解析，现在自己写了一个解析文件上传的过程，代码如下，很好理解，不做解释。

页面

<!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 id = "f" name="f" method="post" enctype="multipart/form-data" action="UploadServerlet"><table><tr><td><input type="file" name="file" id="file">请选择文件<tr><td><button type="submit">提交</button></table></form></body></html>

serverlet

package com.cyj;import java.io.DataInputStream;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.FilterInputStream;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;/** * Servlet implementation class UploadServerlet */@WebServlet("/UploadServerlet")public class UploadServerlet extends HttpServlet {private static final long serialVersionUID = 1L;           /**     * @see HttpServlet#HttpServlet()     */    public UploadServerlet() {        super();        // TODO Auto-generated constructor stub    }/** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {doPost(request, response);}/** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {InputStream is = request.getInputStream();StringBuffer sb = new StringBuffer();int count = 0;while(true){int a = is.read();sb.append((char)a);if(a == '\r')count++;if(count==4){is.read();break;}}String title = sb.toString();System.out.println(title);String[] titles = title.split("\r\n");String fileName = titles[1].split(";")[2].split("=")[1].replace("\"","");System.out.println(fileName);FileOutputStream os = new FileOutputStream(new File("C:\\Users\\Administrator\\Desktop\\"+fileName));byte[] ob = new byte[1024];int length = 0;while((length = is.read(ob, 0, ob.length))>0){os.write(ob,0,length);os.flush();}os.close();is.close();}}

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