I. Review
1.1 If the parameter is received datetime type, need to be processed in the controller.
@InitBinder
Entity type class encapsulates time @DateTimeFormat
1.2 How to save data so that the data acquisition web page.
ModelAndView:
Model: default request scope
Map:
HttpServletRequest:
HttpSession:
@SessionAttributes(name={})
1.3 deal with static resources.
If the request address DispatcherServlet process is /, then it will also deal with static resources.
Used in the configuration file <mvc: default-servlet-handler> does not process the static resources.
1.4 How to use redirection. Redirect
1.5 Springmvc complete ajax function.
Ajax data type of server response time. html, json
The result is html @ResponseBody response but it will be garbled. StringHttpMessageConvert.
The results are Json response type. Jackson need the help of the jar package and @ResponseBody
Second, file upload
1. Import jar package
2. Web page.
Forms must be post submitted code must be multipart / form-data file upload text box must be named.
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <meta 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/> 请选择上传的文件：<input type="file" name="myfile" /><br /> <input type="submit" value="上传"> </form> </body> </html>
3. In springmvc configuration file upload parser.
<-! Upload the configuration file parser ->
<bean the above mentioned id = " the MultipartResolver " class = " org.springframework.web.multipart.commons.CommonsMultipartResolver " >
<! - set the file upload size ->
<Property name = " maxUploadSize " value = " 20971520 " > </ Property>
</ the bean>
4. In the control layer processing code
package com.zhiyou100.klb.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.web.bind.annotation.RequestMapping; import org.springframework.web.multipart.MultipartFile; @Controller public class UploadController { @RequestMapping("upload") public String upload(MultipartFile myfile,HttpServletRequest request) { //1.获取文件上传的真实保存路径 Path = request.getServletContext String () getRealPath (. " / The Upload " ); System. OUT .println (path); // 2. Create a file object File File = new new File (path); IF (! File.Exists ( )) { file.mkdirs (); } // 3. get file name String name = myfile.getOriginalFilename (); the System. OUT .println (name); file targetfile = new new file (path + " / " + name); the try { FileUtils.writeByteArrayToFile(targetFile, myfile.getBytes()); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } return "redirect:index.jsp"; } }
Third, the interceptor (blocking both control layer address filter:.)
1. Create a class that implements the interface HandlerInterceptor
2. The method of rewriting the interface
package com.zhiyou100.klb.interceptor; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.springframework.web.servlet.HandlerInterceptor; import org.springframework.web.servlet.ModelAndView; public class MyInterceptor implements HandlerInterceptor { @Override public void afterCompletion(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, Exception arg3) throws Exception { System.out.println("请求处理完成后执行的方法"); } @Override public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, ModelAndView arg3) throws Exception { System.out.println("=========="); } @Override public boolean preHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2) throws Exception { // TODO Auto-generated method stub System.out.println("起始点"); return true;//如果返回true表示允许通过 } }
3. The class created to springmvc configuration file.
<! - Configuration interceptor ->
<MVC: interceptors>
<! - may be a plurality of interceptors ->
<MVC: Interceptor>
! <- ** represents all subdirectories and user request address - ->
<MVC: Mapping path = " / User / ** " />
<MVC:-Mapping the exclude path = " /user/list.do " />
<the bean class = " com.zhiyou100.klb.interceptor.MyInterceptor " > </ the bean>
</ MVC: Interceptor>
</ MVC: interceptors>
Fourth, data validation
1. Import jar package
2. Add annotations corresponding entity classes
3. In the control parameter receiving layer.
@RequestMapping("register") //requestMapping:表示的就是你的访问地址 public String register(@Valid Users user,BindingResult br,Model model) { if(br.hasErrors()) { List<FieldError> fieldErrors = br.getFieldErrors(); Map<String,Object> errorMsg = new HashMap<>(); for(FieldError f:fieldErrors) { errorMsg.put(f.getField(), f.getDefaultMessage()); } model.addAttribute("errorMsg", errorMsg); return "register"; } else { list.add(user); return "forward:list"; } }
4. Receive error messages file .jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Insert title here</title> </head> <body> 欢迎注册 <form action="/SpringMVC-user/user/register" method="post"> 账号：<input type="text" name="name" >${errorMsg.name }<br/> 密码：<input type="text" name="password">${errorMsg.password }<br/> 电话：<input type="text" name="phone">${errorMsg.phone }<br/> <input type="submit" value="注册"> <input onclick="location.href='javascript:history.go(-1)'" type="button" value="返回"> </form> </body> </html>
5. Common Annotations
