spring+springmvc+mybatis整合之登錄+文件上傳

前幾天我寫了一個小demo，遇到了很多小問題，在此感謝我身邊的小夥伴給我的幫助，最終做出來了！雖然我很笨，但是我努力了，青春，不後悔！加油吧，騷年！本人小白一枚，大神勿噴，有什麼交流可以聯繫我的QQ:673467208（檸檬少年心亦暖）！

1.登錄的controller和文件上傳的controller（僅供參考）：

登錄：
@Controller
@RequestMapping("users/")
public class UsersController {
    @Autowired
    private UsersService usersService;
    @RequestMapping("login")
    public String login(Users user,HttpSession session,Model model){
        Users u=usersService.login(user);
        if(u!=null){
            session.setAttribute("u",u);
            return "redirect:/files/findAll.do";
        }else{
            model.addAttribute("msg", "登錄失敗，請重新登錄");
            return "forward:/index.jsp";
        }
    }
    @RequestMapping("logout")
    public String logout(HttpSession session){
        session.removeAttribute("u");
        return "redirect:/index.jsp";
    }
}

文件上傳:
@Controller
@RequestMapping("files/")
public class FilesController{
    @Autowired
    private FilesService filesService;
    @RequestMapping("findAll")
    public String findAll(Model model){
        List<Files> filesList=filesService.findAll();
        model.addAttribute("filesList", filesList);
        return "success";
    }
    @RequestMapping("add")
    public String add(MultipartFile[] fileName,HttpServletRequest request) throws IllegalStateException, IOException {
        //獲取服務器的絕對路徑
        String path=request.getSession().getServletContext().getRealPath("/")+"/upload/";
        for(int i=0;i<fileName.length;i++){
            MultipartFile fileUpload=fileName[i];
            //1.上傳文件
            String filePath=path+fileUpload.getOriginalFilename();//上傳文件的絕對路徑
            File file=new File(filePath);
            if(!file.exists()){
                file.mkdirs();//創建一個空文件
            }fileUpload.transferTo(file);
            //2.把文件信息保存到數據庫
            Files fileInfo=new Files();
            fileInfo.setFilesname(fileUpload.getOriginalFilename());
            fileInfo.setFilessize(fileUpload.getSize());
            fileInfo.setFilestimes(new Date());
            filesService.add(fileInfo);
        }
        return "redirect:/files/findAll.do";
    }
    @RequestMapping("del")
    public String del(int id,HttpServletRequest request){
        String path=request.getSession().getServletContext().getRealPath("/")+"/upload/";
        Files file = filesService.getid(id);
        File files=new File(path+file.getFilesname());
        files.delete();
        filesService.del(id);
        return "redirect:/files/findAll.do";
    }
}

2.配置時間格式convertor:

public class MyDateConvertor implements Converter<String, Date>{

    public Date convert(String str) {
        String[] patterns=new String[]{"yyyy-MM","yyyy/MM",
                "yyyy-MM-dd","yyyy-MM-dd hh:mm:ss",
                "yyyy/MM/dd","yyyy/MM/dd hh:mm:ss"};
        Date date = null;
        try {
            date=DateUtils.parseDate(str, patterns);

        } catch (ParseException e) {
            e.printStackTrace();
        }
        return date;
    }

}

3.攔截器的配置interceptor：

public class MyInterceptor implements HandlerInterceptor{

    public void afterCompletion(HttpServletRequest arg0,
            HttpServletResponse arg1, Object arg2, Exception arg3)
            throws Exception {

    }
    public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1,
            Object arg2, ModelAndView arg3) throws Exception {

    }
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response,
            Object arg2) throws Exception {
        Users users = (Users)request.getSession().getAttribute("u");
        if(users!=null)
        {

            return true;

        }else{
            request.getRequestDispatcher("/index.jsp").forward(request, response);
            return false;
        }
    }

}

這裏需要注意的是
Users users = (Users)request.getSession().getAttribute(“u”)中的參數（u）要與登錄的controller中的session.setAttribute(“u”,u)（U）相同，否則無法傳參;

4.配置mapper：
登錄的mapper&xml和文件上傳的mapper&xml：

public interface UsersMapper {
    public Users login(Users users);
}
<select id="login" parameterType="Users" resultType="Users">
        select * from users where name=#{name} and pwd=#{pwd}
    </select>


public interface FilesMapper {
    public List<Files> findAll();

    public void add(Files filesInfo);
    public void del(int id);

    public Files getid(int id);
}
<select id="findAll" resultType="files">
        select * from files 
  </select>
  <insert id="add" parameterType="files">
        insert into files values(seq_files.nextval,#{filesname},#{filessize},#{filestimes})
  </insert>
  <delete id="del" parameterType="int">
        delete from files where id=#{id}
  </delete>
  <select id="getid" resultType="files">
        select * from files where id=#{id}
  </select>

5.pojo也就是封裝數據：
（本人使用逆向工程）

 private BigDecimal id;

 private String name;

 private String pwd;


private BigDecimal id;

private String filesname;

private long filessize;

private Date filestimes;

6.實現類service與目標類serviceimpl；

public interface UsersService {
    public Users login(Users users);
}

@Service
public class UsersServiceImpl implements UsersService{
    @Autowired
    private UsersMapper usersMapper;
    public Users login(Users users) {
        return usersMapper.login(users);
    }

}




public interface FilesService {
    public List<Files> findAll();

    public void add(Files fileInfo);

    public void del(int id);

    public Files getid(int id);
}

@Service
public class FilesServiceImpl implements FilesService {
    @Autowired
    private FilesMapper filesMapper;

    public List<Files> findAll() {

        return filesMapper.findAll();
    }

    @Override
    public void add(Files fileInfo) {
        // TODO Auto-generated method stub
        filesMapper.add(fileInfo);
    }

    @Override
    public void del(int id) {
        // TODO Auto-generated method stub
        filesMapper.del(id);
    }

    @Override
    public Files getid(int id) {
        return filesMapper.getid(id);
    }

}

7.登錄頁面：

<center>
  <h1>網絡U盤</h1>
  <form action="users/login.do" method="post">
  <div>${msg }</div>
  <div class="form-group">
    <label for="exampleInputEmail1">用戶名</label>
    <input type="text" class="form-control" name="name" id="exampleInputEmail1" placeholder="用戶名">
  </div>
  <div class="form-group">
    <label for="exampleInputPassword1">密碼</label>
    <input type="password" class="form-control" name="pwd" id="exampleInputPassword1" placeholder="密碼">
  </div>
  <button type="submit" class="btn btn-default">登錄</button>
</form>
    </center>

8.顯示正文：

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt"%>
<%
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 'success.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">
    -->
    <jsp:include page="/common/include.jsp"></jsp:include>
  </head>
  <script type="text/javascript">
        $(function(){
            $("#sel").change(function(){
                $("#files").empty();
                var str=$(this).val();
                for(var i=0;i<str;i++){
                    $("#files").append('<input type="file" name="fileName" id="fileHead">');
                }
            });
        });
  </script>
  <style type="text/css">
    body{
        width:60%;
        margin-left:5%;
    }
  </style>
  <body>
   <h1>網絡U盤</h1>
   <div>歡迎${sessionScope.u.name }登錄<a href="users/logout.do">退出</a></div>
   <table class="table table-bordered table-hover">
        <tr>
        <th>ID</th>
        <th>文件名</th>
        <th>文件大小</th>
        <th>上傳日期</th>
        <th>操作</th>
        </tr>
        <c:forEach items="${filesList}" var="f">
        <tr>
            <td>${f.id }</td>
            <td>${f.filesname }</td>
            <td>${f.filessize }KB</td>
            <td>
                <fmt:formatDate value="${f.filestimes }" pattern="yyyy-MM-dd"/>
            </td>
            <td>
                <a href="files/del.do?id=${f.id }">刪除</a>
            </td>
        </tr>
        </c:forEach>
   </table>
   <h3>上傳文件模塊</h3>
   <form action="files/add.do" method="post" enctype="multipart/form-data">
    <span>上傳文件的數量</span>
    <select id="sel">
        <option value="1">1</option>
        <option value="2">2</option>
        <option value="3">3</option>
    </select>
    <div id="files">
        <input type="file" name="fileName" id="fileHead"/>
    </div>
    <input type="submit" value="上傳"/>
   </form>
  </body>
</html>

這是登錄和上傳的代碼，這些都需要運行於ssm環境，jar包都在一下地址：
環境與jar包