java文件上传功能
//jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
<form action="${pageContext.request.contextPath }/Upload3" method="post" enctype="multipart/form-data">
用户名；<input type="text" name="username"/><br/>
照 片：<input type="file" name="zhaoPian"/><br/>
<input type="submit" value="上传"/>
</form>
</body>
</html>//servlet
package com.kero99.ygc.test;
import java.io.File;
import java.io.IOException;
import java.util.List;
import java.util.UUID;
import javax.servlet.ServletException;
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;
import org.apache.commons.io.FilenameUtils;
public class Upload3 extends HttpServlet {
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//设置编码响应到浏览器的格式
response.setCharacterEncoding("UTF-8");
response.setContentType("text/html;charset=UTF-8");
//设置存的路径 存的文件需要在tomcat项目右键 Browse里找到/WEB-INF/files
String savepath=getServletContext().getRealPath("/WEB-INF/files");
//创建磁盘文件工厂 需要导入上传文件jar包 由工厂接受 解析器处理文件
DiskFileItemFactory diskFileItemFactory=new DiskFileItemFactory();
//创建文件解析器
ServletFileUpload fileUpload=new ServletFileUpload(diskFileItemFactory);
try {
//设置上传文件的编码格式
fileUpload.setHeaderEncoding("UTF-8");
//接受请求 文件解析器解析请求 返回List<FileItem>接口
List<FileItem> list=fileUpload.parseRequest(request);
//迭代 FileItem接口处理文件
for(FileItem item:list){
//如果fileitem中封装的是普通输入项的数据
if(item.isFormField()){
//获取文本内容 eg: <input type="text" name="username"/> getFieldName为文本项内容=username
String name=item.getFieldName();
//获取文本内容 eg:<input type="text" name="username"/> getString=输出的文本
String value=item.getString("UTF-8");
//文本内容设置字符集为utf-8
String value1=new String(name.getBytes("iso8859-1"),"UTF-8");
}else{//else 为上传的是文件
//获取上传文件的名字
String filename1=item.getName();
String filename=UUID.randomUUID().toString().replace("-","")+filename1;
int hCode = filename.hashCode();
String hex = Integer.toHexString(hCode);
File file = new File(savepath,hex.charAt(0)+"/"+hex.charAt(1));
if(!file.exists() && !file.isDirectory() &&!filename1.equals("") && filename1!=null && !filename1.trim().equals("")){
file.mkdirs();
String extension = FilenameUtils.getExtension(filename);
if(!("jsp".equals(extension)||"txt".equals(extension))){
File file1=new File(file,filename);
item.write(file1);
response.getWriter().print("success!");
}else{
response.getWriter().print("文件不能为jsp和exe类型,请从新上传...");
}
}else{
response.getWriter().print("不能是空文件");
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
}//文件上传重构版
package com.kero99.ygc.test;
import java.io.File;
import java.io.IOException;
import java.util.List;
import java.util.UUID;
import javax.servlet.ServletException;
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.commons.io.FilenameUtils;
import com.sun.corba.se.spi.legacy.connection.GetEndPointInfoAgainException;
public class Upload extends HttpServlet{
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request, response);
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
//设置响应浏览器格式
response.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset=utf-8");
String savapath=getServletContext().getRealPath("/WEB-INF/files");
DiskFileItemFactory diskFileItemFactory=new DiskFileItemFactory();
ServletFileUpload fileUpload=new ServletFileUpload(diskFileItemFactory);
try {
fileUpload.setHeaderEncoding("utf-8");
List<FileItem> list=fileUpload.parseRequest(request);
for(FileItem item:list){
if(item.isFormField()){
String name=item.getFieldName();//获取文本项
String value=item.getString("utf-8");//获取文本内容
String value1=new String(name.getBytes("iso8859-1"),"UTF-8");
}else{//为上传的是文件
String filename1=item.getName();
String filename=UUID.randomUUID().toString().replace("-","")+filename1;
//目录打散方法 a/b
String path=getFileChildPath(filename);
File file=new File(savapath,path);
if(!file.exists() && !file.isDirectory()){
file.mkdirs();
String extension=FilenameUtils.getExtension(filename);
if(!("jsp".equals(extension)||"txt".equals(extension))){
File file1=new File(file,filename);
item.write(file1);
response.getWriter().print("success");
}else{
response.getWriter().print("文件不能为jsp和exe类型");
}
}else{
response.getWriter().print("文件不能是空的");
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
//目录打散
public String getFileChildPath(String filename){
int hCode=filename.hashCode();
String hex=Integer.toHexString(hCode);
String path=hex.charAt(0)+"/"+hex.charAt(1);
return path;
}
@Override
public void destroy() {
// TODO Auto-generated method stub
super.destroy();
}
@Override
public void init() throws ServletException {
// TODO Auto-generated method stub
super.init();
}
}
