Filter static resource files
When we add some static resources to the jsp page, an error will occur and an exception will appear in the console.
org.springframework.web.servlet.DispatcherServlet.noHandlerFound No mapping for GET /ssm/static/img/1.png
The following is displayed in the browser:
Root cause : The request configured in web.xml is mapped to all files, as shown in the figure below:
The running result after the modification is completed:
Solution : Make the following configuration in springMVC and use it to intercept and detect .jpg, .css, .js and other suffix files to prevent them from entering the DispatcherServlet.
<mvc:default-servlet-handler/>
Solve the problem of Chinese garbled characters
We found that when submitting a request, if the input is Chinese, the processor method will get garbled characters.
Solution: Just add a filter and set the encoding set for the request object. Just configure it in web.xml.
<!--解决中文乱码-->
<filter>
<filter-name>characterEncodingFilter</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>characterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
Redirect
Case
NewController
package com.ff.ssm.controller;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.servlet.ModelAndView;
@org.springframework.stereotype.Controller
@RequestMapping(path = "/login")
public class Controller {
@RequestMapping(path = "/toLogin")
public ModelAndView toLogin() {
//viewname为视图名，通过视图解析器查找jsp
ModelAndView mv = new ModelAndView("login");
return mv;
}
//ModelAndView默认为请求转发
@PostMapping(path = "login")
public ModelAndView login() {
ModelAndView mv = new ModelAndView("redirect:/login/tosuccess");
return mv;
}
//跳转页面简写方式，只返回视图名称，默认是请求转发
/*
public String login() {
return "redirect:/login/tosuccess";
}
*/
@GetMapping(path = "tosuccess")
public String tosuccess() {
return "success";
}
}
Create a new login page
<%--
Created by IntelliJ IDEA.
User: 云
Date: 2021/5/20
Time: 20:41
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<img src="${path}/static/img/1.png">
<form method="post" action="/ssm/login/login">
<input type="hidden" name="mark" value="save">
账号：<input type="text" name="account">
<br>
密码：<input type="password" name="pwd">
<br>
年龄：<input name="text" name="age">
<br>
出生日期：<input name="text" name="birthday">
<br>
<input type="submit" value="登录">
</form>
</body>
</html>
Create a new login success page
<%--
Created by IntelliJ IDEA.
User: 云
Date: 2021/5/20
Time: 21:35
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<h3>欢迎您登录成功！！！</h3>
</body>
</html>
Running results:
Note that the address visited when you first entered is different from the address where the page jumps after clicking login.
Screenshot of the first visit:
Screenshot after successful login:
Ajax returns json
Case:
New User
package com.ff.ssm.bean;
import org.springframework.format.annotation.DateTimeFormat;
import java.util.Date;
public class User {
private Integer id;
private String name;
private Integer age;
//日期型的不能自动转化为String需要加 @DateTimeFormat转换
@DateTimeFormat
private Date birthday;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
public Date getBirthday() {
return birthday;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}
public User(Integer id, String name, Integer age, Date birthday) {
this.id = id;
this.name = name;
this.age = age;
this.birthday = birthday;
}
@Override
public String toString() {
return "User{" +
"id=" + id +
", name='" + name + '\'' +
", age=" + age +
", birthday=" + birthday +
'}';
}
}
Create new ajaxDemo.jsp
<%--
Created by IntelliJ IDEA.
User: 云
Date: 2021/5/22
Time: 17:15
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
<script type="text/javascript" src="${path}/static/js/jquery.1.8.3.min.js"></script>
<script type="text/javascript">
function save(){
$.post("${path}/login/save",$("#formID").serialize(),function(res){
if(res.code==200){
alert(res.msg)
}else{
alert(res.msg)
}
});
}
</script>
</head>
<body>
<form id="formID">
<input type="text" name="name">
<input type="text" name="age">
<input type="button" value="提交" onclick="save()">
</form>
</body>
</html>
NewController
package com.ff.ssm.controller;
import org.springframework.web.bind.annotation.*;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.Map;
@org.springframework.stereotype.Controller
@RequestMapping(path = "/login")
public class Controller {
@GetMapping(path = "toAjaxDemo")
public String toAjaxDemo() {
return "ajaxDemo";
}
@PostMapping(path = "/save")
@ResponseBody
public Map save(String name, String age) {
Map map = new HashMap();
try{
//System.out.println(10/0);
map.put("code", 200);
map.put("msg", "操作成功");
map.put("data", new LinkedList<>().add("a"));
}catch (Exception e){
map.put("code", 500);
map.put("msg", "操作失败");
}
return map;
}
}
Running results:
When there are no exceptions in the program, the running results
When there are exceptions in the program, the running results
