springmvc框架的几个基本内容

最新推荐文章于 2022-03-03 22:26:41 发布

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最新推荐文章于 2022-03-03 22:26:41 发布

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原文链接：http://www.cnblogs.com/a791551107/p/7424798.html

本文介绍SpringMVC框架的配置过程及其实现的功能，包括视图展示、数据格式化、数据类型转换、文件上传及拦截器使用等关键操作。

配置springmvc.xml文件

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <beans xmlns="http://www.springframework.org/schema/beans"
 3     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4     xmlns:context="http://www.springframework.org/schema/context"
 5     xmlns:mvc="http://www.springframework.org/schema/mvc"
 6     xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
 7         http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
 8         http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">
 9     
10     <context:component-scan base-package="com.neuedu"></context:component-scan>
11     
12     <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
13         <property name="prefix" value="/WEB-INF/views/"></property>
14         <property name="suffix" value=".jsp"></property>
15     </bean>
16     
17     <!-- 数据格式化配置 -->
18     <bean class="org.springframework.web.servlet.view.BeanNameViewResolver">
19         <property name="order" value="100"></property>
20     </bean>
21     <!-- 上传配置 -->
22     <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver" >
23         <property name="defaultEncoding" value="utf-8"></property>
24         <property name="maxInMemorySize" value="102400"></property>
25     </bean>
26     
27     <mvc:default-servlet-handler/>    
28     <mvc:annotation-driven conversion-service="ConversionService"></mvc:annotation-driven>
29     
30     <!-- 数据类型转换器 -->
31     <bean id="ConversionService" class="org.springframework.format.support.FormattingConversionServiceFactoryBean">
32         <property name="converters">
33             <set>
34                 <ref bean="myConverter"/>
35             </set>
36         </property>
37     </bean>
38     <!-- 自定义拦截器 -->
39     <mvc:interceptors>
40         <bean class="com.neuedu.interceptor.MyInterceptor"></bean>
41     </mvc:interceptors>
42 </beans>

controller代码

 1 package com.neuedu.controller;
 2 
 3 import java.io.File;
 4 import java.io.FileInputStream;
 5 import java.io.FileOutputStream;
 6 import java.io.IOException;
 7 import java.io.InputStream;
 8 import java.io.OutputStream;
 9 import java.util.UUID;
10 
11 import javax.servlet.ServletContext;
12 import javax.servlet.http.HttpServletRequest;
13 
14 import org.springframework.stereotype.Controller;
15 import org.springframework.web.bind.annotation.RequestMapping;
16 import org.springframework.web.bind.annotation.RequestMethod;
17 import org.springframework.web.bind.annotation.RequestParam;
18 import org.springframework.web.multipart.commons.CommonsMultipartFile;
19 
20 import com.neuedu.bean.Student;
21 
22 import jdk.nashorn.internal.ir.RuntimeNode.Request;
23 
24 @Controller
25 public class AController {
26     //测试View    
27     @RequestMapping(value="/testView")
28     public String testView(){
29         System.out.println("handler方法执行了");
30         return "myView";
31     }
32     
33     //数据格式化
34     @RequestMapping(value="/addStu",method=RequestMethod.POST)
35     public String addStu(Student student){
36         System.out.println("addStu方法执行了");        
37         return "success";
38     }
39     
40     //数据类型转换
41     @RequestMapping(value="/testConverter",method=RequestMethod.POST)
42     public String testConverter(@RequestParam(value="stu") Student stu)  {
43         System.out.println(stu);
44         return "success";
45     }
46     
47     //上传
48     @RequestMapping(value="/testUpload",method=RequestMethod.POST)
49     public String  testUpload(HttpServletRequest request,@RequestParam(value="desc") String desc, @RequestParam(value="photo") CommonsMultipartFile file){
50         ServletContext servletContext=request.getServletContext();
51         String realPath=servletContext.getRealPath("/upload");
52         File file2=new File(realPath);
53         System.out.println(realPath);
54         if(!file2.exists()){
55             file2.mkdir();
56         }
57         InputStream in=null;
58         OutputStream out=null;
59         String perfix=UUID.randomUUID().toString();
60         perfix=perfix.replace("-", "");
61         String fileName=perfix+"_"+file.getOriginalFilename();
62         try {
63             in=file.getInputStream();
64             out=new FileOutputStream(new File(realPath+"\\"+fileName));
65             byte[] buffer=new byte[10240];
66             int len=0;
67             while((len=in.read(buffer))!=-1){
68                 out.write(buffer, 0, len);
69             }
70             out.close();
71             in.close();
72         } catch (IOException e) {
73             // TODO Auto-generated catch block
74             e.printStackTrace();
75         }    
76         System.out.println(desc);
77         System.out.println(file.getOriginalFilename());
78         return "success";
79     }
80     
81     @RequestMapping(value="/testInterceptor")
82     public String testInterceptor(){
83         System.out.println("到达testInterceptor");
84         return "success";
85     }
86 }

数据类型转换器converter

 1 package com.neuedu.converter;
 2 
 3 import org.springframework.core.convert.converter.Converter;
 4 import org.springframework.stereotype.Component;
 5 
 6 import com.neuedu.bean.Student;
 7 
10 @Component
11 public class MyConverter implements Converter<String,Student>{
12 
13     
14     @Override
15     public Student convert(String stu) {
16         if(stu!=null){
17             String[] split=stu.split("-");
18             if(split.length==2){
19                 String name=split[0];
20                 Integer age=Integer.parseInt(split[1]);
21                 Student student=new Student();
22                 student.setName(name);
23                 student.setAge(age);
24                 return student;
25             }
26         }
27         return null;
28     }
32 }

拦截器interceptor代码

package com.neuedu.interceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;


public class MyInterceptor implements HandlerInterceptor{

    @Override
    public void afterCompletion(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, Exception arg3){
        System.out.println("afterCompletion方法");
        
    }

    @Override
    public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, ModelAndView arg3){
        System.out.println("postHandle方法");
        
    }

    @Override
    public boolean preHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2) throws Exception {
        System.out.println("preHandle方法");
        return true;
    }

}

jsp代码

<%@ 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>
<script type="text/javascript" src="${pageContext.request.contextPath}/script/jquery-1.9.1.min.js"></script>
</head>
<body>

    <!-- 测试View -->
    <a href="${pageContext.request.contextPath}/testView">测试View</a>
    <br>
    <br>
    <!-- 数据格式化 -->
    <form action="${pageContext.request.contextPath}/addStu" method="post" >
        姓名:<input type="text" name="name">
        <br>
        年龄:<input type="text" name="age">
        <br>
        生日:<input type="text" name="brith">
        <br>
        薪水:<input type="text" name="salary">
        <br>
        <input type="submit" value="提交">
    </form>
    <br>
    <!-- 数据类型转换 -->
    <form action="${pageContext.request.contextPath}/testConverter" method="post">
        学生:<input type="text" name="stu">
        <br>
        <input type="submit" value="测试converter">
    </form>
    <br>
    <!-- 文件上传 -->
    <form action="${pageContext.request.contextPath}/testUpload" method="post" enctype="multipart/form-data">
        file:<input type="file" name="photo">
        <br>
        desc:<input type="text" name="desc">
        <br>
        <input type="submit" value="提交">
    </form>
    <br>
    <a href="${pageContext.request.contextPath}/testInterceptor">测试Interceptor</a>
</body>
</html>