springmvc复习笔记----springmvc姓名年龄例子：RequestParam 试水

时间：2025-04-06 13:33:13

继续

继上节http://www.cnblogs.com/tk55/p/6652394.html

重要部分颜色突出

结构

springmvc复习笔记----springmvc姓名年龄例子：RequestParam 试水

包

springmvc复习笔记----springmvc姓名年龄例子：RequestParam 试水

web.xml

乱码处理方面设置 <url-pattern>*</url-pattern>对所有对象起作用

<?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>springmvc01</display-name>

  <welcome-file-list>

<welcome-file>index.jsp</welcome-file>

  </welcome-file-list>

  <servlet>

    <servlet-name>springDispatcherServlet</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>springDispatcherServlet</servlet-name>

    <url-pattern>/</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>utf8</param-value>

    </init-param>

  </filter>

  <filter-mapping>

  <filter-name>characterEncodingfilter</filter-name>

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

  </filter-mapping>

</web-app>

spring-mvc.xml

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

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

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

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

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

    xsi:schemaLocation="http://www.springframework.org/schema/beans

    http://www.springframework.org/schema/beans/spring-beans-4.3.xsd

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

    http://www.springframework.org/schema/context/spring-context-4.3.xsd">

<!--   自动扫描加载注解的包 -->

<context:component-scan base-package="com.ij34.bean"/>

<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">

<property name="prefix" value="/WEB-INF/view/"></property>

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

</bean>

</beans>

index.jsp

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

    pageEncoding="UTF-8"%>

<% response.sendRedirect("students/list"); %>

list.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8" import="java.util.*"

    pageEncoding="UTF-8"%>

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

<title>Insert title here</title>

</head>

<body>

<a href="${pageContext.request.contextPath}/students/preSave">添加学生</a>

<table>

<tr>

<th>编号</th>

<th>姓名</th>

<th>年龄</th>

<th>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="${pageContext.request.contextPath }/students/preSave?id=${student.id}">修改</a>

&nbsp;

<a href="${pageContext.request.contextPath }/students/delete?id=${student.id}">删除</a>

</td>

</tr>

</c:forEach>

</table>

</body>

</html>

add.jsp

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

    pageEncoding="UTF-8"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

<title>Insert title here</title>

</head>

<body>

<form action="${pageContext.request.contextPath }/students/save"method="post">

<table>

<tr>

<th colspan="2">学生添加</th>

</tr>

<tr>

<td>姓名</td>

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

</tr>

<tr>

<td>年龄</td>

<td><input type="text" name="age"/></td>

</tr>

<tr>

<td colspan="2"><input value="提交" type="submit"/></td>

</tr>

</table>

</form>

</body>

</html>

update.jsp

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

    pageEncoding="UTF-8"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

<title>Insert title here</title>

</head>

<body>

<form action="${pageContext.request.contextPath }/students/save"method="post">

<table>

<tr>

<th colspan="2">学生修改</th>

</tr>

<tr>

<td>姓名</td>

<td><input type="text" name="name" value="${students.name }"/></td>

</tr>

<tr>

<td>年龄</td>

<td><input type="text" name="age" value="${students.age }"/></td>

</tr>

<tr>

<td><input type="hidden" name="id" value="${students.id }"/> </td>

<td colspan="2"><input value="提交" type="submit"/></td>

</tr>

</table>

</form>

</body>

</html>

Students.java

package com.ij34.model;

public class Students {

   private int id;

   private String name;

   private int age;

   public Students() {

    // TODO Auto-generated constructor stub

}

   public Students(int id,String name,int age) {

    this.id=id;

    this.name=name;

    this.age=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;

}

}

Testhello.java

package com.ij34.bean;

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.ij34.model.Students;

@Controller

@RequestMapping("/students")  //外部请求的 包括update.jsp里${students.name }

public class Testhello {

  private static List<Students> studentlist=new ArrayList<Students>();

  static{

      studentlist.add(new Students(1, "林肯", 39));

      studentlist.add(new Students(2, "奥巴马", 42));

      studentlist.add(new Students(3, "川普", 66));

      studentlist.add(new Students(4, "布什", 56));

  }

  @RequestMapping("/list")   //@RequestMapping  请求映射

  public ModelAndView list() {

    ModelAndView mav=new ModelAndView();  //ModelAndView  返回模型和视图

    mav.addObject("studentlist", studentlist);

    mav.setViewName("students/list");

   return mav;

 }

  @RequestMapping("/preSave")

  public ModelAndView preSave(@RequestParam(value="id",required=false)String id ){//@RequestParam  请求参数

    ModelAndView mav=new ModelAndView();

    if(id!=null){

        mav.addObject("students", studentlist.get(Integer.parseInt(id)-1));

        mav.setViewName("students/update");

    }else {

        mav.setViewName("students/add");

    }

    return mav;

  }

  @RequestMapping("/save")

  public String save(Students student){

      if(student.getId()!=0){

         Students s=studentlist.get(student.getId()-1);

         s.setName(student.getName());

         s.setAge(student.getAge());

      }else{

          studentlist.add(student);

      }

      return "redirect:/students/list";

  }

  @RequestMapping("/delete")

  public String delete(@RequestParam("id")int id){//@RequestParam  请求参数

       studentlist.remove(id-1);

      return "redirect:/students/list";  //重定向redirect或者forward转发

  }

}

springmvc复习笔记----springmvc姓名年龄例子：RequestParam 试水

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