1.使用JAR
??????jsp文件上傳主要使用了兩個(gè)jar包，commons-fileupload-1.2.1.jar和commons-io-1.4.jar
2.代碼實(shí)現(xiàn)
???? public class UploadServlet extends HttpServlet {
?/**
? *
? */
?private static final long serialVersionUID = 1L;
?private ServletContext sc;
?private String savePath;
?@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 {
??System.out.println("請(qǐng)求進(jìn)來(lái)了..........");
??// 設(shè)置請(qǐng)求的編碼
??request.setCharacterEncoding("UTF-8");
??DiskFileItemFactory factory = new DiskFileItemFactory();//創(chuàng)建一個(gè)磁盤文件工廠
??ServletFileUpload upload = new ServletFileUpload(factory);
??try {
???List items = upload.parseRequest(request);
???Iterator it = items.iterator();
???while (it.hasNext()) {
????FileItem item = (FileItem) it.next();
????if (item.isFormField()) {
?????System.out.println("表單的參數(shù)名稱：" + item.getFieldName()
???????+ ",對(duì)應(yīng)的參數(shù)值：" + item.getString("UTF-8"));
????} else {
?????// 獲取文件擴(kuò)展名
?????String strtype = item.getName().substring(
???????item.getName().length() - 3,
???????item.getName().length());
?????strtype = strtype.toLowerCase();
?????if (strtype == "jpg" || strtype == "gif"
???????|| strtype == "txt") {
??????if (item.getName() != null
????????&& !item.getName().equals("")) {
???????System.out.println("上傳文件的大小：" + item.getSize());
???????System.out.println("上傳文件的類型："
?????????+ item.getContentType());
???????System.out.println("上傳文件的名稱：" + item.getName());
???????System.out.println("文件的擴(kuò)展名" + strtype);
???????File tempFile = new File(item.getName());
???????File file = new File(
?????????sc.getRealPath("/") + savePath, tempFile
???????????.getName());
???????item.write(file);
???????request.setAttribute("upload.message", "上傳文件成功！");
??????} else {
???????request.setAttribute("upload.message",
?????????"沒有選擇上傳文件獲取格式不支持");
??????}
?????} else {
??????request.setAttribute("upload.message", "上傳文件格式不支持");
?????}
????}
???}
??} catch (Exception e) {
???e.printStackTrace();
???request.setAttribute("upload.message", "上傳文件不成功！");
??}
??// 轉(zhuǎn)發(fā)
??request.getRequestDispatcher("/uploadResult.jsp").forward(request,
????response);
?}
?@Override
?public void init(ServletConfig config) throws ServletException {
??savePath = config.getInitParameter("savePath");
??sc = config.getServletContext();
?}
1.關(guān)聯(lián)映射的本質(zhì)：就是將關(guān)聯(lián)關(guān)系映射到數(shù)據(jù)庫(kù)中，關(guān)聯(lián)關(guān)系指對(duì)象模型中的一個(gè)或多個(gè)引用.
2.下面列舉多對(duì)一的示例：用戶和組(多個(gè)用戶屬于一個(gè)組)多對(duì)一關(guān)聯(lián)映射是最常用的一種關(guān)聯(lián)映射
?? *User 類
???package com.lzy
?? public class User{
?? private int id;
?? private String name;
? private Group group;//持有組的引用
???
?? public User(){};
?? //省略set,get方法
?}
? *Group類
?package com.lzy
?public class Group{
??
?? private int id;
?? private String name;
?? //省略get,set方法
?}
3.對(duì)對(duì)象進(jìn)行關(guān)系映射，這也是Hibernate中比較難的一點(diǎn)。
? (1)User.hbm.xml
??????
??????<?xml version="1.0">
??????<!DOCTYPE?hibernate-mapping PUBLIC? "-//Hibernate/Hibernate Mapping DTD 3.0//EN" http://hibernate.sourceforge.net/hibernate-mapping-3.0
.dtd">
?? ? <hibernate-mapping package="com.lzy">
?????????<class name="User" table="t_user">
???????????????<id name="id" column="id">
?????????????????????<genarator class="native"/>
????????????? </id>
????????????<property name="name" column="user_name" not-null="true"/>
????????????<many-to-one name="group" column="groupid"/>
??????? </calss>
???? </hibernate-mapping>
?? (2)Group.hbm.xml
?????????
??????<?xml version="1.0">
??????<!DOCTYPE?hibernate-mapping PUBLIC? "-//Hibernate/Hibernate Mapping DTD 3.0//EN" http://hibernate.sourceforge.net/hibernate-mapping-3.0
.dtd">
?? ? <hibernate-mapping package="com.lzy">
?????????<class name="Group" table="t_group">
???????????????<id name="id" column="id">
?????????????????????<genarator class="native"/>
????????????? </id>
????????????<property name="name" column="group_name" not-null="true"/>
??????</class>
???</hibernate-mapping>
4.測(cè)試
public class? Test {
???
? public static void main(String args[]){
??????SessionFactory? sessionFactory=null;
????? Session? session=null;
????? Transaction?? transaction=null;
??????
??????sessionFactory = HibernateUtil.getSessionFactory();// 創(chuàng)建一個(gè)會(huì)話工廠
????? session = sessionFactory.openSession();// 創(chuàng)建一個(gè)會(huì)話實(shí)例
????? transaction = session.beginTransaction();// 申明一個(gè)事務(wù)
??User user= new User();
??Group?group = new Group();
??user.setName("龍一");
??group.setName("中南大學(xué)");
? user.setGroup(group);
??try {
???transaction.begin();
???session.save(user);
???transaction.commit();
??} catch (Exception e) {
???e.printStackTrace();
??}
?? }
}