SpringMVC入门 bug集锦X2

 package cn.itcast.converter;

 import org.springframework.core.convert.converter.Converter;

 import java.text.ParseException;

 import java.text.SimpleDateFormat;

 import java.util.Date;

 public class DateConverter implements Converter<String, Date> {

     @Override

     public Date convert(String source) {

         SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

         Date date = null;

         try {

             date = sdf.parse(source);

         } catch (ParseException e) {

             e.printStackTrace();

         }

         return date;

     }

 }

DateConverter

 package cn.itcast.domain;

 public class User {

     private String name;

     private int age;

     public User(){}

     public String getName() {

         return name;

     }

     public void setName(String name) {

         this.name = name;

     }

     public int getAge() {

         return age;

     }

     public void setAge(int age) {

         this.age = age;

     }

     @Override

     public String toString() {

         return "User{" +

                 "name='" + name + '\'' +

                 ", age=" + age +

                 '}';

     }

 }

User

 package cn.itcast.vo;

 import cn.itcast.domain.User;

 public class VO {

     private User[] userList;

     public VO(){}

     public User[] getUserList() {

         return userList;

     }

     public void setUserList(User[] userList) {

         this.userList = userList;

     }

 }

 package cn.itcast.web.controller;

 import cn.itcast.domain.User;

 import cn.itcast.vo.VO;

 import org.springframework.stereotype.Component;

 import org.springframework.stereotype.Controller;

 import org.springframework.ui.Model;

 import org.springframework.validation.support.BindingAwareModelMap;

 import org.springframework.web.bind.annotation.RequestBody;

 import org.springframework.web.bind.annotation.RequestMapping;

 import org.springframework.web.bind.annotation.RequestParam;

 import org.springframework.web.bind.annotation.ResponseBody;

 import org.springframework.web.servlet.ModelAndView;

 import java.util.ArrayList;

 import java.util.Arrays;

 import java.util.Date;

 import java.util.List;

 @Controller

 //@Component

 public class UserController {

     /*

         响应处理，跳转

      */

     @RequestMapping("/quick1")

     public String quick1(){

         //视图字符串，可以使用绝对路径和相对路径

         return "/mvc.jsp";

     }

     @RequestMapping("/quick2")

     public ModelAndView quick2(){

         ModelAndView modelAndView = new ModelAndView();

         //ViewName即视图字符串

         modelAndView.setViewName("/mvc.jsp");

         //SpringMVC会自动将ModelAndView中存入的数据，存入request域

         modelAndView.addObject("name", "刘备");

         return modelAndView;

     }

     @RequestMapping("/quick3")

     //由SpringMVC创建ModelAndView

     public ModelAndView quick3(ModelAndView modelAndView){

         //ViewName即视图字符串

         modelAndView.setViewName("/mvc.jsp");

         //SpringMVC会自动将ModelAndView中存入的数据，存入request域

         modelAndView.addObject("name", "孙权");

         return modelAndView;

     }

     //使用Model+视图字符串，则Model必须由SpringMVC创建。

     @RequestMapping("/quick4")

     public String quick4(Model model){

         //SpringMVC会自动将ModelAndView中存入的数据，存入request域

         model.addAttribute("name", "曹操");

         return "/mvc.jsp";

     }

     //错误示例: 返回视图字符串，自己创建Model的话无法交给SpringMVC。

     @RequestMapping("/quick5")

     public String quick5(){

         Model model = new BindingAwareModelMap();

         //SpringMVC会自动将ModelAndView中存入的数据，存入request域

         model.addAttribute("name", "小乔");

         return "/mvc.jsp";

     }

     /*

         直接响应数据

      */

     @RequestMapping("/quick6")

     @ResponseBody

     public String quick6(){

         return "你好 mvc";//?? mvc

     }

     @RequestMapping("/quick7")

     @ResponseBody

     public User quick7(){

         User user = new User();

         user.setName("刘备");

         user.setAge(20);

         return user;

     }

     @RequestMapping("/quick8")

     @ResponseBody

     public List<User> quick8(){

         User user = new User();

         user.setName("刘备");

         user.setAge(20);

         User user2 = new User();

         user2.setName("孙权");

         user2.setAge(20);

         List<User> userList = new ArrayList<>();

         userList.add(user);

         userList.add(user2);

         return userList;

     }

     @RequestMapping("/quick9")

     public String quick9(){

         return "mvc";

     }

     /*

         请求处理

      */

     @RequestMapping("/quick10")

     @ResponseBody

     public void quick10(String name, Integer age){

         System.out.println(name + ":" + age);

     }

     @RequestMapping("/quick11")

     @ResponseBody

     public void quick11(User user){

         System.out.println(user);

     }

     @RequestMapping("/quick12")

     @ResponseBody

     public void quick12(String[] strs){

         System.out.println(Arrays.toString(strs));

     }

     @RequestMapping("/quick13")

     @ResponseBody

     public void quick13(VO vo){

         System.out.println(Arrays.toString(vo.getUserList()));

     }

 /*    @RequestMapping("/quick14")

     @ResponseBody

     public void quick14(@RequestBody List<User> userList){

         System.out.println(userList);

     }*/

     @RequestMapping("/quick14")

     @ResponseBody

     public void quick14(@RequestBody User[] users){

         System.out.println(Arrays.toString(users));

     }

     @RequestMapping("/quick15")

     @ResponseBody

     public void quick15(@RequestParam("name") String username){

         System.out.println(username);

     }

     @RequestMapping("/quick16")

     @ResponseBody

     public void quick16(Date date){

         System.out.println(date);

     }

 }

UserController

 <?xml version="1.0" encoding="UTF-8"?>

 <beans xmlns="http://www.springframework.org/schema/beans"

        xmlns:mvc="http://www.springframework.org/schema/mvc"

        xmlns:context="http://www.springframework.org/schema/context"

        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

        xsi:schemaLocation="

        http://www.springframework.org/schema/beans

        http://www.springframework.org/schema/beans/spring-beans.xsd

        http://www.springframework.org/schema/mvc

        http://www.springframework.org/schema/mvc/spring-mvc.xsd

        http://www.springframework.org/schema/context

        http://www.springframework.org/schema/context/spring-context.xsd

 ">

     <!--组件扫描-->

     <context:component-scan base-package="cn.itcast.web.controller"></context:component-scan>

     <!--启用jackson-->

     <!--<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">

         <property name="messageConverters">

             <list>

                 <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"></bean>

             </list>

         </property>

     </bean>-->

     <!--设置视图字符串前后缀-->

     <!--<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">

         <property name="prefix" value="/"></property>

         <property name="suffix" value=".jsp"></property>

     </bean>-->

     <!--当SpringMVC没有匹配成功使用的Servlet处理器-->

     <!--<mvc:default-servlet-handler></mvc:default-servlet-handler>-->

     <mvc:resources mapping="/js/**" location="/js/"></mvc:resources>

     <!--注入自定义类型转换器-->

     <bean id="conversionService" class="org.springframework.context.support.ConversionServiceFactoryBean">

         <property name="converters">

             <list>

                 <bean class="cn.itcast.converter.DateConverter"></bean>

             </list>

         </property>

     </bean>

     <!--mvc注解驱动，默认启用jackson，使用类型转换服务-->

     <mvc:annotation-driven conversion-service="conversionService"></mvc:annotation-driven>

 </beans>

spring-mvc.xml

 <?xml version="1.0" encoding="UTF-8"?>

 <project xmlns="http://maven.apache.org/POM/4.0.0"

          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

     <modelVersion>4.0.0</modelVersion>

     <groupId>cn.itcast</groupId>

     <artifactId>spring_mvc_day2</artifactId>

     <version>1.0-SNAPSHOT</version>

     <dependencies>

         <!--springmvc-->

         <dependency>

             <groupId>org.springframework</groupId>

             <artifactId>spring-webmvc</artifactId>

             <version>5.0.5.RELEASE</version>

         </dependency>

         <!--jackson-->

         <dependency>

             <groupId>com.fasterxml.jackson.core</groupId>

             <artifactId>jackson-databind</artifactId>

             <version>2.9.8</version>

         </dependency>

     </dependencies>

 </project>

pom.xml

 <?xml version="1.0" encoding="UTF-8"?>

 <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"

          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

          xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"

          version="3.1">

     <!--SpringMVC核心控制器-->

     <servlet>

         <servlet-name>DispatcherServlet</servlet-name>

         <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

         <init-param>

             <param-name>contextConfigLocation</param-name>

             <param-value>classpath:spring-mvc.xml</param-value>

         </init-param>

         <load-on-startup>1</load-on-startup>

     </servlet>

     <servlet-mapping>

         <servlet-name>DispatcherServlet</servlet-name>

         <url-pattern>/</url-pattern>

     </servlet-mapping>

     <!--编码过滤器-->

     <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>

 </web-app>

web.xml

<%@ page contentType="text/html;charset=UTF-8" language="java" %>

<html>

<head>

    <title>Title</title>

</head>

<body>

    <h1>你好 mvc ${name}</h1>

</body>

</html>

mvc.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>

<html>

<head>

    <title></title>

    <script src="/js/jquery-3.3.1.js"></script>

    <script>

        $(function () {

            var users = new Array();

            users.push({"name": "刘备"});

            users.push({"name": "孙权", age: 20});

            //发送异步请求，携带对象数据

            $.ajax({

                type: "POST",

                url: "/quick14",

                data: JSON.stringify(users),

                contentType: "application/json;charset=utf-8"

            });

        });

    </script>

</head>

<body>

</body>

</html>

ajax.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>

<html>

<head>

    <title>Title</title>

</head>

<body>

    <form action="/quick13" method="post">

        <input type="text" name="userList[0].name">

        <input type="text" name="userList[0].age">

        <input type="text" name="userList[1].name">

        <input type="text" name="userList[1].age">

        <input type="submit" value="提交">

    </form>

</body>

</html>

array.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>

<html>

<head>

    <title>Title</title>

</head>

<body>

    <form action="/quick15" method="post">

        <input type="text" name="name">

        <input type="submit" name="提交">

    </form>

</body>

</html>

encode.jsp

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