springmvc file upload
1. Import jar package
Download: https://github.com/suyirulan/putao/tree/master/fileupload_jar
jsp page:
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Insert title here</title> </head> <body> <form action="addStudent" method="post" enctype="multipart/form-data"> 姓名：<input type="text" name="name" /><br> 年龄：<input type="text" name="age" /><br> 头像：<input type="file" name="photo" /><br> <input type="submit" value="上传" /> </form> </body> </html>
Note: The properties sheet form tag method = "post" must be submitted by post; enctype = "multipart / form-data" is to be written, and the file name = "" also must write
2. Upload the configuration file parser springmvc
<!-- 配置文件上传解析器 -->
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<property name="maxUploadSize" value="209715200"></property>
</bean>
Note: The value in units of bytes; bytes: 1M = 1024k = 1024 * 1024 = 1048576 bytes
3. Controller layer processing control codes
package com.zhiyou100.xg.controller; import java.io.File; import java.io.IOException; import javax.servlet.http.HttpServletRequest; import org.apache.commons.io.FileUtils; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.multipart.MultipartFile; import com.zhiyou100.xg.bean.Student; @Controller public class StudentController { //文件上传 @RequestMapping("addStudent") public String addStudent(Student stu,MultipartFile photo,HttpServletRequest request,Model model) { String path = request.getServletContext().getRealPath("/photo"); File file = new File(path); if(!file.exists()) { file.mkdirs(); } String filename = System.currentTimeMillis()+ photo.getOriginalFilename(); stu.setPhotos("photo/"+filename); File targetfile = new File(path+"/"+filename); try { FileUtils.writeByteArrayToFile(targetfile, photo.getBytes()); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } model.addAttribute("stu", stu); return "index"; } }
2.springmvc interceptors
1. Create a class that implements the interface Handlerinterceptor
2. The method of rewriting interface
1 public class MyInterceptor implements HandlerInterceptor{ 2 3 @Override 4 public void afterCompletion(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, Exception arg3) 5 throws Exception { 6 // TODO Auto-generated method stub 7 8 } 9 10 @Override 11 public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, ModelAndView arg3) 12 throws Exception { 13 // TODO Auto-generated method stub 14 15 } 16 17 @Override 18 public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object arg2) throws Exception { 19 Object name = request.getSession().getAttribute("name"); 20 if(name!=null) { 21 return true; 22 }else { 23 System.out.println("拦截器"); 24 return false; 25 } 26 } 27 28 }
3. Configure interceptors in springmvc profile
<!-- 配置拦截器 -->
<mvc:interceptors>
<mvc:interceptor>
<mvc:mapping path="/user/**"/>
<mvc:exclude-mapping path="/user/tologin"/><!-- 不过滤login页面 -->
<mvc:exclude-mapping path="/user/login"/>
<mvc:exclude-mapping path="/user/register"/>
<bean class="com.zhiyou100.xg.interceptor.MyInterceptor"></bean>
</mvc:interceptor>
</mvc:interceptors>
4. Controller layer processing control codes
package com.zhiyou100.xg.controller; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.SessionAttributes; @Controller @RequestMapping("/user") @SessionAttributes(names= {"name","address"})//键名叫：name保存的作用域为session public class UsersController { @RequestMapping("tologin") public String tologin(){ return "login"; } @RequestMapping("login") public String login(String name,String password ,Model model) { if("admin".equals(name)&&"admin".equals(password)) { model.addAttribute("name", name); return "list"; }else{ return "login"; } } @RequestMapping("register") public String register() { return "register"; } @RequestMapping("List") //If not logged in, then the access request address is returned to the login page public String List () { System.out.println ( "query all user information" ); return "List" ; } }
Demand: index.jsp; register.jsp; login.jsp do not need to filter and list pages to see the successful landing
jsp page placement
1.index.jsp page
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Insert title here</title> </head> <body> <a href="user/tologin">登录</a> <a href="user/register">注册</a> <a href="user/list">查询</a> <a href="user/delete">删除</a> </body> </html>
2.login.jsp page
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Insert title here</title> </head> <body> <form action="login" method="post"> 用户名：<input type="text" name="name"/><br> 密码：<input type="text" name="password"/><br> <input type="submit" value="登录"> </form> </body> </html>
3.register.jsp page
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Insert title here</title> </head> <body> <form action="users/register" method="post"> 姓名：<input type="text" name="unames"/><br> 密码：<input type="text" name="password"/><br> 手机：<input type="text" name="phone"/><br> <input type="submit" value="提交"/> </form> </body> </html>
4.list.jsp page
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Insert title here</title> </head> <body> ==========list============ </body> </html>
3.springmvc background check
1. introduced jar package
2. Add annotations corresponding entity classes
Detailed notes:
3. When receiving a control parameter layer
4.jsp page
