注册页面头像上传的实现：

1. 注册页面：register.jsp

两种方式实现图片上传:

pageEncoding="UTF-8"%>

register

body{

margin-left:700px;

margin-top:100px;

}

table{

width:500px;

height:320px;

border:1px solid #009999;

}

table tr{

border:1px solid #009999;

}

table tr td{

border:1px solid #009999;

text-align:left;

}

/* var xhr;

//1.创建xmlhttprequest(xhr)对象

function checkuser(){

try{

xhr=new XMLHttpRequest();

}catch(e){

xhr=new ActiveXObject("Microsoft.XMLHTTP");

}

//alert(xhr);

//2.设置状态改变回调函数

xhr.onreadystatechange=cb;

var uname=document.getElementById("uname");

//3.设置请求方式和路径

//xhr.open("GET","CheckUserServlet?un="+uname.value);

xhr.open("POST","CheckUserServlet");

//如果是post请求必须加上请求头

xhr.setRequestHeader("Content-Type","application/x-www-form-urlencoded")

//4.发送请求

xhr.send("un="+uname.value);

}

//5.处理响应内容

function cb(){

//完成响应

if(xhr.readyState==4){

//成功响应

if(xhr.status==200){

var resText=xhr.responseText;

var msg=document.getElementById("msg");

//alert(resText);

if(resText=="t"){

msg.style.color="red";

msg.innerHTML="此用户名太受欢迎，请更换一个";

}else{

msg.style.color="green";

msg.innerHTML="恭喜您:账号可以使用";

}

}

}

//alert(xhr.readyState);

} */

$(function(){

$("#uname").blur(function(){

$.post("CheckUserServlet",{un:this.value},function(resText){

if(resText=="t"){

$("#msg").css("color","red").html("此用户名太受欢迎，请更换一个");

}else{

$("#msg").css("color","green").html("恭喜您:账号可以使用");

}

})

})

})

2.RegisterServlet:

package com.xintouyun.jweb.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 java.util.UUID;

import javax.servlet.ServletContext;

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 com.xintouyun.jweb.entity.User;

import com.xintouyun.jweb.service.UserService;

import com.xintouyun.jweb.service.impl.UserServiceImpl;

public class RegServlet extends HttpServlet{

public void doPost(HttpServletRequest request,HttpServletResponse response) throws IOException,ServletException{

// Create a factory for disk-based file items

DiskFileItemFactory factory = new DiskFileItemFactory();

// Configure a repository (to ensure a secure temp location is used)

ServletContext servletContext = this.getServletConfig().getServletContext();

File repository = (File) servletContext.getAttribute("javax.servlet.context.tempdir");

factory.setRepository(repository);

// Create a new file upload handler

ServletFileUpload upload = new ServletFileUpload(factory);

// Parse the request

try {

User user=new User();

List items = upload.parseRequest(request);

for (FileItem item : items) {

//如果是普通的form元素

if(item.isFormField()) {

String filename=item.getFieldName();

String value=item.getString("utf-8");

//System.out.println("普通form元素"+filename+":"+value);

if(filename.equals("username")) {

user.setUsername(value);

}else if(filename.equals("userpwd")) {

user.setUserpwd(value);

}else if(filename.equals("mail")) {

user.setEmail(value);

}else if(filename.equals("address")) {

user.setAddress(value);

}else if(filename.equals("hobby")) {

user.setHobby(value);

}

}else {

String filename=item.getName();

System.out.println("文件"+filename);

//获取文件名的后缀

String suffix=filename.substring(filename.lastIndexOf('.'));

//为了防止上传到服务器中的文件重名，所以在上传的时候我们可以将文件进行自动生成前缀，只保留后缀，再拼接到一块的方法，来避免文件重名

UUID uuid=UUID.randomUUID();

String prefix=uuid.toString();

//拼接后的文件名

String savefilename=prefix+suffix;

savefilename=savefilename.replace("-", "");

//System.out.println("要保存的文件名为"+savefilename);

String path=servletContext.getRealPath("/Images");

user.setPhoto(savefilename);

System.out.println("path"+path);

InputStream is=item.getInputStream();

OutputStream os=new FileOutputStream(new File(path+File.separator+savefilename));

byte[] b=new byte[1024];

int len;

while((len=is.read(b))!=-1) {

os.write(b, 0, len);

}

is.close();

os.close();

}

}

System.out.println("userpwd"+user.getUserpwd());

UserService userservice=new UserServiceImpl();

boolean result=userservice.saveUser(user);

if(result) {

//request.getRequestDispatcher("LoginPreServlet").forward(request, response);

response.sendRedirect("LoginPreServlet");

}else {

response.sendRedirect("RegisterPreServlet");

}

} catch (FileUploadException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

public void doGet(HttpServletRequest request,HttpServletResponse response) throws IOException,ServletException{

this.doPost(request, response);

}

}

3.配置xml文件

4.重启服务器，浏览器访问