图片上传

图片的保存路径是在运行项目中.即WebContent/attachment

update.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%
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%>">
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">

.navbar-inverse {
border-radius: 0;
margin-bottom: 0;
}

.navbar-inverse .navbar-header {
180px;
text-align: center;
border-right: 1px solid rgba(255, 255, 255, 0.4);
}

.navbar-inverse .navbar-header .navbar-brand {
float: none;
display: inline-block;
}

.slider {
180px;
min- 180px;
top: 52px;
bottom: 0;
position: absolute;
background-color: rgba(0, 0, 0, 0.00);
box-shadow: 3px 0 6px rgba(0, 0, 0, 0.3)
}

.slider .nav li a:hover,.slider .nav li.active>a {
background-color: rgba(0, 0, 0, 0.2) !important;
}

.slider .sub-menu li a {
padding-left: 40px;
}

.slider .sub-menu { /* border-bottom:1px solid #e5e5e5; */
border-top: 1px solid #e5e5e5;
}

#wrap {
margin: 0 0 0 180px;
}

#wrap .wrap {
padding: 5px 10px;
}

.panel .panel-footer {
background-color: #ffffff;
padding: 0 15px;
}

.panel-footer .pagination {
margin: 5px;
}
</style>
</head>

<ul class="nav navbar-nav">
<li class="active"><a href="#">首页 <span class="sr-only">(current)</span></a></li>
<li><a href="views/login.jsp">登录</a></li>
<li class="dropdown"><a href="#" class="dropdown-toggle"
data-toggle="dropdown" role="button" aria-haspopup="true"
aria-expanded="false">更多 <span class="caret"></span></a>
<ul class="dropdown-menu">
<li><a href="#">注册</a></li>
<li><a href="#">Another action</a></li>
<li><a href="#">Something else here</a></li>
<li role="separator" class="divider"></li>
<li><a href="#">Separated link</a></li>
<li role="separator" class="divider"></li>
<li><a href="#">One more separated link</a></li>
</ul></li>
</ul>
<ul class="nav navbar-nav pull-right">
<li><a href="logout" title="安全退出">安全退出</a></li>
</ul>
</nav>
<div class="slider">
<ul class="nav">
<li class="active"><a href="javascript:void(0);"
onclick="openOrClose(this)"><i class="glyphicon glyphicon-user"></i>
用户管理 <i class="glyphicon glyphicon-chevron-down pull-right"></i></a>
<ul class="nav sub-menu">
<li><a href="users/usersController?_method=findAll"><i
class="glyphicon glyphicon-list"></i> 用户列表</a></li>
<li class="active"><a href="#"><i
class="glyphicon glyphicon-plus"></i> 用户添加</a></li>
</ul></li>
<li><a href="javascript:void(0);" onclick="openOrClose(this)"><i
class="glyphicon glyphicon-th-list"></i> 地址管理 <i
class="glyphicon glyphicon-chevron-left pull-right"></i></a>
<ul class="nav sub-menu hidden">
<li><a href="#"><i class="glyphicon glyphicon-list"></i>
地址列表</a></li>
<li><a href="#"><i class="glyphicon glyphicon-plus"></i>
地址添加</a></li>
</ul></li>

</ul>
</div>

</div>
</body>
<script type="text/javascript" src="assets/js/jquery-1.11.3.min.js"></script>
<script type="text/javascript" src="assets/js/bootstrap.min.js"></script>
<script type="text/javascript">
//打开或是关闭菜单
function openOrClose(_dom) {
var sub_menu = getNextSilbing(_dom);
var flag = _dom.querySelector(".pull-right");
//如果包含某些样式则做一些事情
if (hasClass(sub_menu, "hidden")) {
//去掉关于隐藏的class
removeClass(sub_menu, "hidden");
//去掉菜单上的向左的箭头
removeClass(flag, "glyphicon-chevron-left");
//添加上向下的箭头
addClass(flag, "glyphicon-chevron-down");
} else {
//添加是隐藏的class
addClass(sub_menu, "hidden");
//移除向下的箭头
removeClass(flag, "glyphicon-chevron-down");
//添加上向左的箭头
addClass(flag, "glyphicon-chevron-left");
}
//console.log();

}
//得到下一个兄弟节点
function getNextSilbing(_dom) {
_dom = _dom.nextSibling;
while (_dom.nodeType != 1) {
_dom = _dom.nextSibling;
}
return _dom;
}
//判断是否包含没有个class样式
function hasClass(_dom, _className) {
if (_dom.className.indexOf(_className) != -1) {
return true;
}
return false;
}
//给指定的元素添加指定的样式
function addClass(_dom, _className) {
_dom.className = _dom.className + " " + _className;
}
//给指定的元素移除指定的样式
function removeClass(_dom, _className) {
_dom.className = _dom.className.replace(_className, "");
//将每次添加上的多余的空格去掉
_dom.className = _dom.className.replace(/s+/ig, " ");
}
</script>
</html>

UsersController.java

package com.huawei.controller;

import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

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.cdsxt.common.Page;
import com.cdsxt.po.Users;
import com.cdsxt.service.UsersService;

/**
* Servlet implementation class UsersController
*/
public class UsersController extends HttpServlet {
private static final long serialVersionUID = 1L;

private UsersService usersService = new UsersService();

/**
* @see HttpServlet#HttpServlet()
*/
public UsersController() {
super();
// TODO Auto-generated constructor stub
}

/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
this.doPost(request, response);
}

/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
/**
* 将当前的doPost方法当作中专站
*/
String _method = request.getParameter("_method");

if("findAll".equalsIgnoreCase(_method)){
this.findAll(request, response);
}else if("deleteById".equalsIgnoreCase(_method)){
this.deleteById(request, response);
}else if("register".equalsIgnoreCase(_method)){
this.register(request, response);
}else if("findById".equalsIgnoreCase(_method)){
this.findById(request, response);
}else if("update".equalsIgnoreCase(_method)){
this.update(request, response);
}
}

private void update(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{

Users curr = (Users) request.getSession().getAttribute("admin");

if(ServletFileUpload.isMultipartContent(request)){
Map<String, FileItem> map = new HashMap<String, FileItem>();
//创建工厂
DiskFileItemFactory factory = new DiskFileItemFactory();
//得到JVM提供的缓存目录
ServletContext context = this.getServletContext();
File repository = (File)context.getAttribute("javax.servlet.context.tempdir");
factory.setRepository(repository);
//创建ServletFileUpload
ServletFileUpload upload = new ServletFileUpload(factory);

//解析请求
try {
List<FileItem> items = upload.parseRequest(request);
//users = new Users();

for(FileItem item:items){
//form表单里面的每一个字段
map.put(item.getFieldName(), item);
}

Users u = new Users();

u.setId(Integer.parseInt(map.get("id").getString()));
u.setUsername(map.get("username").getString());
u.setPassword(map.get("password").getString());
u.setEmail(map.get("email").getString());
//u.setImage(Integer.parseInt(map.get("id").getString()));
u.setAge(Integer.parseInt(map.get("age").getString()));

//处理前一步的数据没有顺序的问题
//for(String key:map.keySet()){
//FileItem item = map.get(key);

//if(item.isFormField()){

//没有顺序

//}else{
//得到跟路径
String path = context.getRealPath("/");
//得到附件目录
File attachment = new File(path,"attachment/"+map.get("username").getString());
//如果没有就创建目录
System.out.println(attachment.getAbsolutePath());
System.out.println(attachment.exists());
if(!attachment.exists()){
attachment.mkdirs();
}

FileItem image = map.get("image");

File output = new File(attachment,System.currentTimeMillis()+"."+getSuffix(image.getName()));

image.write(output);
u.setImage("attachment/"+map.get("username").getString()+"/"+output.getName());
//System.currentTimeMillis()
this.usersService.update(u);
this.findAll(request, response);
//}
//}
//map.get("id");
} catch (Exception e) {
e.printStackTrace();
}
}

}

private String getSuffix(String name){
if(name!=null){
String[] suffixs = name.split("\.");
if(suffixs.length>1){
return suffixs[suffixs.length-1];
}
}
return "";
}

private void findById(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {
String id = request.getParameter("id");
if(id!=null && id.trim()!=""){
Users users = this.usersService.findById(Integer.parseInt(id));
request.setAttribute("users", users);
request.getRequestDispatcher("/views/update.jsp").forward(request, response);
return ;
}
}

private void register(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
Users users = null;
//判断是否有文件上传
if(ServletFileUpload.isMultipartContent(request)){
//创建工厂
DiskFileItemFactory factory = new DiskFileItemFactory();
//得到JVM提供的缓存目录
ServletContext context = this.getServletContext();
File repository = (File)context.getAttribute("javax.servlet.context.tempdir");
factory.setRepository(repository);
//创建ServletFileUpload
ServletFileUpload upload = new ServletFileUpload(factory);

//解析请求
try {
List<FileItem> items = upload.parseRequest(request);
users = new Users();

for(FileItem item:items){
//form表单里面的每一个字段

}
//得到跟路径
String path = context.getRealPath("/");
//得到附件目录
File attachment = new File(path,"attachment");
//如果没有就创建目录
if(!attachment.exists()){
attachment.mkdirs();
}

} catch (FileUploadException e) {
e.printStackTrace();
}
}

}

protected void deleteById(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
String id = request.getParameter("id");
this.usersService.deleteById(Integer.parseInt(id));
response.sendRedirect("usersController?_method=findAll");

}

protected void findAll(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//List<Users> users = this.usersService.findAll();
//request.setAttribute("users", users);

String keyword = request.getParameter("keyword");

if(keyword==null){
keyword = "";
}

Page page = new Page();
String curr = request.getParameter("curr");
if(curr ==null || curr.trim().equals("")){
curr ="1";
}
page.getKeywords().put("username", keyword);
page.setCurr(Integer.parseInt(curr));
page = this.usersService.find4Page(page);
request.setAttribute("page", page);
request.getRequestDispatcher("/views/index.jsp").forward(request, response);
return;
}

}

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原文地址：https://www.cnblogs.com/hwgok/p/5873935.html