SpringMvc第二讲

系统管理员 2022-03-15 01:10 219阅读 0赞

[SpringMvc第一讲——helloWorld][SpringMvc_helloWorld]

**目录**

工程目录:

SpringMvc的自动封装对象功能：

乱码问题：

SpringMvc对servlet API的支持：

--------------------

# 工程目录: #

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lvbmdidXRpbmd4aWRl_size_16_color_FFFFFF_t_70][]

web.xml

spring-mvc.xml

<?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xmlns:p="http://www.springframework.org/schema/p"
        xmlns:context="http://www.springframework.org/schema/context"
        xmlns:mvc="http://www.springframework.org/schema/mvc"
        xsi:schemaLocation="
            http://www.springframework.org/schema/beans
            http://www.springframework.org/schema/beans/spring-beans-4.1.xsd
            http://www.springframework.org/schema/mvc
            http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd
            http://www.springframework.org/schema/context
            http://www.springframework.org/schema/context/spring-context-4.1.xsd ">
    
    	
        <context:component-scan base-package="com.java1234"/>
    
    
         
        <mvc:annotation-driven />  
        
    	<bean id="viewResolver"
    		class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    		<property name="prefix" value="/WEB-INF/jsp/" />
    		<property name="suffix" value=".jsp"></property>
    	</bean>
    
    </beans>

Student.java

package com.java1234.model;
    
    public class Student {
    
    	private int id;
    	private String name;
    	private int age;
    	public int getId() {
    		return id;
    	}
    	public void setId(int id) {
    		this.id = id;
    	}
    	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;
    	}
    	public Student() {
    		super();
    		// TODO Auto-generated constructor stub
    	}
    	public Student(int id, String name, int age) {
    		super();
    		this.id = id;
    		this.name = name;
    		this.age = age;
    	}
    	
    	
    }

StudentController.java

package com.java1234.controller;
    
    import java.util.ArrayList;
    import java.util.List;
    
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestParam;
    import org.springframework.web.servlet.ModelAndView;
    
    import com.java1234.model.Student;
    
    @Controller
    @RequestMapping("/student")
    public class StudentController {
    
    	private static List<Student> studentList=new ArrayList<Student>();
    	static {
    		studentList.add(new Student(1,"张飞",88));
    		studentList.add(new Student(2,"关羽",67));
    		studentList.add(new Student(3,"赵云",44));
    	}
    	@RequestMapping("/list")
    	public ModelAndView list() {
    		ModelAndView mav=new ModelAndView();
    		mav.addObject("studentList", studentList);
    		mav.setViewName("student/list");
    		return mav;
    	}
    	
    	@RequestMapping("/preSave")
    	public ModelAndView preSave(@RequestParam(value="id",required=false) String hh) {
    		ModelAndView mav=new ModelAndView();
    		if(hh!=null) {
    			mav.addObject("stu",studentList.get(Integer.parseInt(hh)-1));
    			mav.setViewName("student/update");
    		}else {
    			mav.setViewName("student/add");
    			
    		}
    		return mav;
    	}
    	
    }

![20190228144058812.png][]

![20190228144109187.png][]

add.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>
    <form action="${pageContext.request.contextPath}/student/save.do" method="post">
    	<table>
    	<tr>
    	<td>姓名:<input type="text" name="name"/></td>
    	</tr>
    	<tr>
    	<td>年龄：<input type="text" name="age"/></td>
    	</tr>
    	<tr>
    	<td><input type="submit" value="提交"/></td>
    	</tr>
    	</table>
    </form>
    </body>
    </html>

list.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
        pageEncoding="UTF-8"%>
    <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
    <!DOCTYPE html>
    <html>
    <head>
    <meta charset="UTF-8">
    <title>Insert title here</title>
    </head>
    <body>
    <a href="${pageContext.request.contextPath}/student/preSave.do">学生添加</a>
    <table>
    <tr><th>编号</th><th>姓名</th><th>年龄</th><th colspan="2">操作</th></tr>
    <c:forEach var="student" items="${studentList }">
    <tr>
    <td>${student.id }</td>
    <td>${student.name }</td>
    <td>${student.age }</td>
    <td><a href="${pageContext.request.contextPath}/student/preSave.do?id=${student.id}">修改</a></td>
    </tr>
    </c:forEach>
    </table>
    
    </body>
    </html>

update.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>
    <form action="${pageContext.request.contextPath}/student/save.do" method="post">
    	<table>
    	<tr>
    	<td>姓名:<input type="text" name="name" value="${stu.name }"></td>
    	</tr>
    	<tr>
    	<td>年龄：<input type="text" name="age" value="${stu.age }"/></td>
    	</tr>
    	<tr>
    	<td><input type="hidden" name="id" value="${stu.id }"/></td>
    	</tr>
    	<tr>
    	<td><input type="submit" value="提交"/></td>
    	</tr>
    	</table>
    </form>
    </body>
    </html>

index.jsp

运行：

![20190228144757236.png][]

![20190228144858134.png][]

点击学生添加：

![20190228144907712.png][]

点击修改：

![20190228144917661.png][]

改进StudentController.java

#  SpringMvc的自动封装对象功能：![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lvbmdidXRpbmd4aWRl_size_16_color_FFFFFF_t_70 1][] #

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lvbmdidXRpbmd4aWRl_size_16_color_FFFFFF_t_70 2][]

#  乱码问题： #

在web.xml中添加编码相关的过滤器，解决乱码问题

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lvbmdidXRpbmd4aWRl_size_16_color_FFFFFF_t_70 3][]

web.xml

<?xml version="1.0" encoding="UTF-8"?>
    <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
      <display-name>SpringMvc-01</display-name>
      <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
      </welcome-file-list>
      
      <servlet>
    		<servlet-name>springmvc</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>
    	</servlet>
    	<servlet-mapping>
    		<servlet-name>springmvc</servlet-name>
    		<url-pattern>*.do</url-pattern>
    	</servlet-mapping>
    	
    	<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>*.do</url-pattern>
    	</filter-mapping>
    	
    </web-app>

# SpringMvc对servlet API的支持： #

SpringMvc可以直接引用servelet中的相关对象，比如request，response，session等

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lvbmdidXRpbmd4aWRl_size_16_color_FFFFFF_t_70 4][]

[SpringMvc_helloWorld]: https://blog.csdn.net/yongbutingxide/article/details/88014382
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[20190228144058812.png]: /images/20220315/4ae613d971584c6da9c68ea20498955e.png
[20190228144109187.png]: /images/20220315/93f0e419612b4f6dae8873c6fa7b1ac9.png
[20190228144757236.png]: /images/20220315/9fd0357a197f43389e2ca29fb6a485c8.png
[20190228144858134.png]: /images/20220315/f889656082c844de9ff9f0185b2c7391.png
[20190228144907712.png]: /images/20220315/578190901f214cc78e7baa1c6f0c6703.png
[20190228144917661.png]: /images/20220315/ef897716ed574c3fb55d923a34590896.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lvbmdidXRpbmd4aWRl_size_16_color_FFFFFF_t_70 1]: /images/20220315/2a9f93605bd94e11af08f2aa21bab841.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lvbmdidXRpbmd4aWRl_size_16_color_FFFFFF_t_70 2]: /images/20220315/a99acb0f13124c3bb8715826078447cf.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lvbmdidXRpbmd4aWRl_size_16_color_FFFFFF_t_70 3]: /images/20220315/d8bf785d08a84c4493983570b6664d0d.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lvbmdidXRpbmd4aWRl_size_16_color_FFFFFF_t_70 4]: /images/20220315/262d8a4a4827492e89d9e1dd10a49a50.png