<%--
@author qiyulin @date 2019 09 22
实现无依赖jar文件上传
可支持windows 和 linux 亲测无错误
--%>
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@page import="java.io.BufferedReader"%>
<%@page import="java.io.StringReader"%>
<%@page import="java.io.IOException"%>
<%@page import="java.io.File"%>
<%@page import="java.io.InputStream"%>
<%@page import="java.io.ByteArrayOutputStream"%>
<%@page import="java.io.FileOutputStream"%>
<%@page import="java.io.PrintWriter"%>
<%@page import="java.text.SimpleDateFormat"%>
<%!
//换行符 文件上传的换行符和系统无关！！！！
public static String LINE_SEPARATOR = "\r\n"; //System.getProperty("line.separator")
//提取上传的文件头信息
private FileHeadInfo extractFileHead(String content) throws IOException {
BufferedReader reader = new BufferedReader(new StringReader(content));
String multipartDelimiter, fileName, contentType,lineRead;
if ((lineRead = reader.readLine()) != null) {
//读取的第一行是一个分割符
multipartDelimiter = lineRead;
//对分隔符分割 获取有用信息
String strs[] = content.split(multipartDelimiter);
String avial = strs[strs.length-2];
reader = new BufferedReader(new StringReader(avial));
StringBuilder sb =new StringBuilder(LINE_SEPARATOR);
reader.readLine();//第一行空白
if ((lineRead = reader.readLine()) != null) {
//读取的第二行为：Content-Disposition: form-data; name="file1"; filename="320_442.png"
fileName = new File(lineRead.split(";")[2].split("=")[1].replace('"', ' ').trim()).getName();
sb.append(lineRead+LINE_SEPARATOR);
//以上为获取filename
if ((lineRead = reader.readLine()) != null) {
//第三行为：Content-Type: image/png
contentType = lineRead.split(":")[1].trim();
sb.append(lineRead+LINE_SEPARATOR);
//空白行
sb.append(LINE_SEPARATOR);
//返回上传文件头的实体类
int start = 0;
for(int i=0;i<(strs.length-2);i++){
String ss = multipartDelimiter+strs[i];
start+=ss.getBytes().length;
}
start+=sb.toString().getBytes().length;
return new FileHeadInfo(multipartDelimiter,fileName, contentType,start);
}
}
}
return null;
}
//根目录URL
private String ROOT(HttpServletRequest request){
String path = request.getRequestURI().substring(0,request.getRequestURI().lastIndexOf("/"));
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
return basePath;
}
//根目录物理路径
private String PATH(HttpServletRequest request){
String s = request.getContextPath();
String uri = request.getRequestURI();
int last = uri.replace(s,"").lastIndexOf("/");
String mid ="";
if(last!=0) mid = uri.replace(s,"").substring(1,last)+File.separator;
String root = request.getSession().getServletContext().getRealPath("/")+mid;
return root;
}
//uuid文件名
private String UUID(){
UUID uuid = UUID.randomUUID();
return uuid.toString().replace("-","").toLowerCase().substring(8,24);
}
//提取的上传文件信息
class FileHeadInfo {
private String multipartDelimiter;
//文件名
private String originalFileName;
//文件的 content type
private String contentType;
//文件的数据 start bytes.length
private int dataStart;
public FileHeadInfo(String _multipartDelimiter,String _original_file_name
,String _content_type,int _data_start) {
multipartDelimiter = _multipartDelimiter;
originalFileName = _original_file_name;
contentType = _content_type;
dataStart = _data_start;
}
}
%>
<%
if(request.getMethod().equals("POST")){
InputStream inputStream = request.getInputStream();
if (inputStream.available()!=-1) {
//判断文件大小
if (request.getContentLength() > 5000000) {//5M
PrintWriter pw = response.getWriter();
pw.print("{\"status\":2,\"info\":\"file length is too large\"}");
pw.close();
return;
}
//建立缓冲区
ByteArrayOutputStream byteOutput = new ByteArrayOutputStream(request.getContentLength());
if (inputStream != null) {
int i =0;
byte [] b = new byte[2048];
while((i = inputStream.read(b))!= -1){
byteOutput.write(b, 0, i);
}
}
//字节数组
byte requestContent [] =byteOutput.toByteArray();
//转为字符串
String requestContentAsString =new String(requestContent);
//获取报头所携带的文件信息
FileHeadInfo headerBean = extractFileHead(requestContentAsString);
//检查文件的扩展名
if (!(headerBean.originalFileName.toLowerCase().indexOf(".jpg") !=-1||
headerBean.originalFileName.toLowerCase().indexOf(".png") !=-1||
headerBean.originalFileName.toLowerCase().indexOf(".gif") !=-1||
headerBean.originalFileName.toLowerCase().indexOf(".bmp") !=-1||
headerBean.originalFileName.toLowerCase().indexOf(".xls") !=-1)
){
PrintWriter pw = response.getWriter();
pw.print("{\"status\":3,\"info\":\"extension not allowed\"}");
pw.close();
return;
}
//检查文件的content type
if (!("application/vnd.ms-excel".equals(headerBean.contentType)||
"image/jpeg".equals(headerBean.contentType)||
"image/png".equals(headerBean.contentType)||
"image/gif".equals(headerBean.contentType)||
"image/bmp".equals(headerBean.contentType)
)){
PrintWriter pw = response.getWriter();
pw.print("{\"status\":4,\"info\":\"content type is invalid\"}");
pw.close();
return;
}
//获取文件内容
String root = PATH(request)+"uploads"+File.separator;
String yyyymm= new SimpleDateFormat("yyyy-MM").format(new Date());
File path = new File(root+yyyymm);
String filename =UUID()+headerBean.originalFileName.substring(headerBean.originalFileName.lastIndexOf("."));
if(!path.exists()) path.mkdir();
//把文件写到本地
FileOutputStream fileOut = new FileOutputStream(new File(path,filename));
//wirte
int end =requestContent.length-headerBean.dataStart-headerBean.multipartDelimiter.getBytes().length-"--".getBytes().length-LINE_SEPARATOR.getBytes().length;
fileOut.write(requestContent,headerBean.dataStart,end);
fileOut.flush();
fileOut.close();
//out
PrintWriter pw = response.getWriter();
pw.print("{\"status\":1,\"info\":\""+ROOT(request)+"uploads/"+yyyymm+"/"+filename+"\"}");
pw.close();
}else{
PrintWriter pw = response.getWriter();
pw.print("{\"status\":0,\"info\":\"file can not be empty\"}");
pw.close();
}
}
%>
