SpringMVC入門 bug集錦X2

時間 2020-06-03

標籤 springmvc 入門 bug 集錦 x2 欄目 Spring 简体版

原文原文鏈接

 1 package cn.itcast.converter;
 2 
 3 import org.springframework.core.convert.converter.Converter;
 4 
 5 import java.text.ParseException;
 6 import java.text.SimpleDateFormat;
 7 import java.util.Date;
 8 
 9 public class DateConverter implements Converter<String, Date> {
10     @Override
11     public Date convert(String source) {
12         SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
13         Date date = null;
14         try {
15             date = sdf.parse(source);
16         } catch (ParseException e) {
17             e.printStackTrace();
18         }
19         return date;
20     }
21 }

DateConverter

 1 package cn.itcast.domain;
 2 
 3 public class User {
 4     private String name;
 5     private int age;
 6 
 7     public User(){}
 8 
 9     public String getName() {
10         return name;
11     }
12 
13     public void setName(String name) {
14         this.name = name;
15     }
16 
17     public int getAge() {
18         return age;
19     }
20 
21     public void setAge(int age) {
22         this.age = age;
23     }
24 
25     @Override
26     public String toString() {
27         return "User{" +
28                 "name='" + name + '\'' +
29                 ", age=" + age +
30                 '}';
31     }
32 }

User

 1 package cn.itcast.vo;
 2 
 3 import cn.itcast.domain.User;
 4 
 5 public class VO {
 6     private User[] userList;
 7 
 8     public VO(){}
 9 
10     public User[] getUserList() {
11         return userList;
12     }
13 
14     public void setUserList(User[] userList) {
15         this.userList = userList;
16     }
17 }

  1 package cn.itcast.web.controller;
  2 
  3 import cn.itcast.domain.User;
  4 import cn.itcast.vo.VO;
  5 import org.springframework.stereotype.Component;
  6 import org.springframework.stereotype.Controller;
  7 import org.springframework.ui.Model;
  8 import org.springframework.validation.support.BindingAwareModelMap;
  9 import org.springframework.web.bind.annotation.RequestBody;
 10 import org.springframework.web.bind.annotation.RequestMapping;
 11 import org.springframework.web.bind.annotation.RequestParam;
 12 import org.springframework.web.bind.annotation.ResponseBody;
 13 import org.springframework.web.servlet.ModelAndView;
 14 
 15 import java.util.ArrayList;
 16 import java.util.Arrays;
 17 import java.util.Date;
 18 import java.util.List;
 19 
 20 @Controller
 21 //@Component
 22 public class UserController {
 23     /*
 24         響應處理，跳轉
 25      */
 26     @RequestMapping("/quick1")
 27     public String quick1(){
 28         //視圖字符串，可使用絕對路徑和相對路徑
 29         return "/mvc.jsp";
 30     }
 31 
 32     @RequestMapping("/quick2")
 33     public ModelAndView quick2(){
 34         ModelAndView modelAndView = new ModelAndView();
 35 
 36         //ViewName即視圖字符串
 37         modelAndView.setViewName("/mvc.jsp");
 38 
 39         //SpringMVC會自動將ModelAndView中存入的數據，存入request域
 40         modelAndView.addObject("name", "劉備");
 41 
 42         return modelAndView;
 43     }
 44 
 45     @RequestMapping("/quick3")
 46     //由SpringMVC建立ModelAndView
 47     public ModelAndView quick3(ModelAndView modelAndView){
 48         //ViewName即視圖字符串
 49         modelAndView.setViewName("/mvc.jsp");
 50 
 51         //SpringMVC會自動將ModelAndView中存入的數據，存入request域
 52         modelAndView.addObject("name", "孫權");
 53 
 54         return modelAndView;
 55     }
 56 
 57     //使用Model+視圖字符串，則Model必須由SpringMVC建立。
 58     @RequestMapping("/quick4")
 59     public String quick4(Model model){
 60         //SpringMVC會自動將ModelAndView中存入的數據，存入request域
 61         model.addAttribute("name", "曹操");
 62         return "/mvc.jsp";
 63     }
 64 
 65     //錯誤示例: 返回視圖字符串，本身建立Model的話沒法交給SpringMVC。
 66     @RequestMapping("/quick5")
 67     public String quick5(){
 68         Model model = new BindingAwareModelMap();
 69         //SpringMVC會自動將ModelAndView中存入的數據，存入request域
 70         model.addAttribute("name", "小喬");
 71         return "/mvc.jsp";
 72     }
 73 
 74     /*
 75         直接響應數據
 76      */
 77     @RequestMapping("/quick6")
 78     @ResponseBody
 79     public String quick6(){
 80         return "你好 mvc";//?? mvc
 81     }
 82 
 83     @RequestMapping("/quick7")
 84     @ResponseBody
 85     public User quick7(){
 86         User user = new User();
 87         user.setName("劉備");
 88         user.setAge(20);
 89 
 90         return user;
 91     }
 92 
 93     @RequestMapping("/quick8")
 94     @ResponseBody
 95     public List<User> quick8(){
 96         User user = new User();
 97         user.setName("劉備");
 98         user.setAge(20);
 99 
100         User user2 = new User();
101         user2.setName("孫權");
102         user2.setAge(20);
103 
104         List<User> userList = new ArrayList<>();
105         userList.add(user);
106         userList.add(user2);
107 
108         return userList;
109     }
110 
111     @RequestMapping("/quick9")
112     public String quick9(){
113         return "mvc";
114     }
115 
116     /*
117         請求處理
118      */
119     @RequestMapping("/quick10")
120     @ResponseBody
121     public void quick10(String name, Integer age){
122         System.out.println(name + ":" + age);
123     }
124 
125     @RequestMapping("/quick11")
126     @ResponseBody
127     public void quick11(User user){
128         System.out.println(user);
129     }
130 
131     @RequestMapping("/quick12")
132     @ResponseBody
133     public void quick12(String[] strs){
134         System.out.println(Arrays.toString(strs));
135     }
136 
137     @RequestMapping("/quick13")
138     @ResponseBody
139     public void quick13(VO vo){
140         System.out.println(Arrays.toString(vo.getUserList()));
141     }
142 
143 /*    @RequestMapping("/quick14")
144     @ResponseBody
145     public void quick14(@RequestBody List<User> userList){
146         System.out.println(userList);
147     }*/
148 
149     @RequestMapping("/quick14")
150     @ResponseBody
151     public void quick14(@RequestBody User[] users){
152         System.out.println(Arrays.toString(users));
153     }
154 
155     @RequestMapping("/quick15")
156     @ResponseBody
157     public void quick15(@RequestParam("name") String username){
158         System.out.println(username);
159     }
160 
161     @RequestMapping("/quick16")
162     @ResponseBody
163     public void quick16(Date date){
164         System.out.println(date);
165     }
166 }

UserController

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <beans xmlns="http://www.springframework.org/schema/beans"
 3        xmlns:mvc="http://www.springframework.org/schema/mvc"
 4        xmlns:context="http://www.springframework.org/schema/context"
 5        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 6        xsi:schemaLocation="
 7        http://www.springframework.org/schema/beans
 8        http://www.springframework.org/schema/beans/spring-beans.xsd
 9        http://www.springframework.org/schema/mvc
10        http://www.springframework.org/schema/mvc/spring-mvc.xsd
11        http://www.springframework.org/schema/context
12        http://www.springframework.org/schema/context/spring-context.xsd
13 ">
14 
15     <!--組件掃描-->
16     <context:component-scan base-package="cn.itcast.web.controller"></context:component-scan>
17 
18     <!--啓用jackson-->
19     <!--<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
20         <property name="messageConverters">
21             <list>
22                 <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"></bean>
23             </list>
24         </property>
25     </bean>-->
26 
27     <!--設置視圖字符串先後綴-->
28     <!--<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
29         <property name="prefix" value="/"></property>
30         <property name="suffix" value=".jsp"></property>
31     </bean>-->
32 
33     <!--當SpringMVC沒有匹配成功使用的Servlet處理器-->
34     <!--<mvc:default-servlet-handler></mvc:default-servlet-handler>-->
35 
36     <mvc:resources mapping="/js/**" location="/js/"></mvc:resources>
37 
38     <!--注入自定義類型轉換器-->
39     <bean id="conversionService" class="org.springframework.context.support.ConversionServiceFactoryBean">
40         <property name="converters">
41             <list>
42                 <bean class="cn.itcast.converter.DateConverter"></bean>
43             </list>
44         </property>
45     </bean>
46 
47     <!--mvc註解驅動，默認啓用jackson，使用類型轉換服務-->
48     <mvc:annotation-driven conversion-service="conversionService"></mvc:annotation-driven>
49 
50 </beans>

spring-mvc.xml

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <project xmlns="http://maven.apache.org/POM/4.0.0"
 3          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 5     <modelVersion>4.0.0</modelVersion>
 6 
 7     <groupId>cn.itcast</groupId>
 8     <artifactId>spring_mvc_day2</artifactId>
 9     <version>1.0-SNAPSHOT</version>
10 
11     <dependencies>
12         <!--springmvc-->
13         <dependency>
14             <groupId>org.springframework</groupId>
15             <artifactId>spring-webmvc</artifactId>
16             <version>5.0.5.RELEASE</version>
17         </dependency>
18 
19         <!--jackson-->
20         <dependency>
21             <groupId>com.fasterxml.jackson.core</groupId>
22             <artifactId>jackson-databind</artifactId>
23             <version>2.9.8</version>
24         </dependency>
25     </dependencies>
26 
27 </project>

pom.xml

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
 3          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4          xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
 5          version="3.1">
 6 
 7     <!--SpringMVC核心控制器-->
 8     <servlet>
 9         <servlet-name>DispatcherServlet</servlet-name>
10         <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
11         <init-param>
12             <param-name>contextConfigLocation</param-name>
13             <param-value>classpath:spring-mvc.xml</param-value>
14         </init-param>
15         <load-on-startup>1</load-on-startup>
16     </servlet>
17     <servlet-mapping>
18         <servlet-name>DispatcherServlet</servlet-name>
19         <url-pattern>/</url-pattern>
20     </servlet-mapping>
21 
22     <!--編碼過濾器-->
23     <filter>
24         <filter-name>CharacterEncodingFilter</filter-name>
25         <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
26         <init-param>
27             <param-name>encoding</param-name>
28             <param-value>UTF-8</param-value>
29         </init-param>
30     </filter>
31     <filter-mapping>
32         <filter-name>CharacterEncodingFilter</filter-name>
33         <url-pattern>/*</url-pattern>
34     </filter-mapping>
35 
36 </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": "劉備"});
            users.push({"name": "孫權", age: 20});
            //發送異步請求，攜帶對象數據
            $.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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