spring mvc(注解)上传文件的简单例子

本文提供了一个使用Spring MVC实现文件上传的简单示例,包括配置文件和代码解析。

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        spring mvc(注解)上传文件的简单例子       

        分类:            springmvc 30998人阅读 评论(7) 收藏 举报

spring mvc(注解)上传文件的简单例子,这有几个需要注意的地方
1.form的enctype=”multipart/form-data” 这个是上传文件必须的
2.applicationContext.xml中 <bean id=”multipartResolver” class=”org.springframework.web.multipart.commons.CommonsMultipartResolver”/> 关于文件上传的配置不能少

大家可以看具体代码如下:

web.xml

  1. <?xml version="1.0" encoding="UTF-8"?> 
  2. <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" 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"> 
  3.   <display-name>webtest</display-name> 
  4.  
  5.   <listener> 
  6.         <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> 
  7.     </listener> 
  8.     <context-param> 
  9.         <param-name>contextConfigLocation</param-name> 
  10.         <param-value> 
  11.             /WEB-INF/config/applicationContext.xml 
  12.             /WEB-INF/config/codeifAction.xml 
  13.         </param-value> 
  14.     </context-param> 
  15.  
  16.     <servlet> 
  17.         <servlet-name>dispatcherServlet</servlet-name> 
  18.         <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> 
  19.         <init-param> 
  20.             <param-name>contextConfigLocation</param-name> 
  21.             <param-value>/WEB-INF/config/codeifAction.xml</param-value> 
  22.         </init-param> 
  23.         <load-on-startup>1</load-on-startup> 
  24.     </servlet> 
  25.     <!-- 拦截所有以do结尾的请求 --> 
  26.     <servlet-mapping> 
  27.         <servlet-name>dispatcherServlet</servlet-name> 
  28.         <url-pattern>*.do</url-pattern> 
  29.     </servlet-mapping> 
  30.  
  31.   <welcome-file-list> 
  32.     <welcome-file>index.do</welcome-file> 
  33.   </welcome-file-list> 
  34. </web-app> 
<?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" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" 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>webtest</display-name>

  <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>
            /WEB-INF/config/applicationContext.xml
            /WEB-INF/config/codeifAction.xml
        </param-value>
    </context-param>

    <servlet>
        <servlet-name>dispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>/WEB-INF/config/codeifAction.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <!-- 拦截所有以do结尾的请求 -->
    <servlet-mapping>
        <servlet-name>dispatcherServlet</servlet-name>
        <url-pattern>*.do</url-pattern>
    </servlet-mapping>

  <welcome-file-list>
    <welcome-file>index.do</welcome-file>
  </welcome-file-list>
</web-app>


applicationContext.xml

  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" xmlns:p="http://www.springframework.org/schema/p" 
  4.     xmlns:context="http://www.springframework.org/schema/context" 
  5.     xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd 
  6.     http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd" 
  7.     default-lazy-init="true"> 
  8.  
  9.     <!-- 启动Spring MVC的注解功能,完成请求和注解POJO的映射 --> 
  10.     <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" lazy-init="false" /> 
  11.  
  12.     <!-- 另外最好还要加入DefaultAnnotationHandlerMapping,不然会被 XML或其它的映射覆盖! --> 
  13.     <bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" /> 
  14.  
  15.     <!-- 对模型视图名称的解析,即在模型视图名称添加前后缀 --> 
  16.     <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" p:prefix="/WEB-INF/jsp/" p:suffix=".jsp" /> 
  17.  
  18.     <!-- 支持上传文件 --> 
  19.     <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"/> 
  20.  
  21. </beans> 
<?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"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
    http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd"
    default-lazy-init="true">

    <!-- 启动Spring MVC的注解功能,完成请求和注解POJO的映射 -->
    <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" lazy-init="false" />

    <!-- 另外最好还要加入DefaultAnnotationHandlerMapping,不然会被 XML或其它的映射覆盖! -->
    <bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" />

    <!-- 对模型视图名称的解析,即在模型视图名称添加前后缀 -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" p:prefix="/WEB-INF/jsp/" p:suffix=".jsp" />

    <!-- 支持上传文件 -->
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"/>

</beans>


codeifAction.xml

  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" xmlns:context="http://www.springframework.org/schema/context" 
  4.     xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd 
  5.     http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd" 
  6.     default-lazy-init="true"> 
  7.  
  8.     <bean id="uploadAction" class="com.codeif.action.UploadAction" /> 
  9.  
  10. </beans> 
<?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:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
    http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd"
    default-lazy-init="true">

    <bean id="uploadAction" class="com.codeif.action.UploadAction" />

</beans>


UploadAction.java

  1. package com.codeif.action; 
  2.  
  3. import java.io.File; 
  4. import java.util.Date; 
  5.  
  6. import javax.servlet.http.HttpServletRequest; 
  7.  
  8. import org.springframework.stereotype.Controller; 
  9. import org.springframework.ui.ModelMap; 
  10. import org.springframework.web.bind.annotation.RequestMapping; 
  11. import org.springframework.web.bind.annotation.RequestParam; 
  12. import org.springframework.web.multipart.MultipartFile; 
  13.  
  14. @Controller 
  15. public class UploadAction { 
  16.  
  17.     @RequestMapping(value = "/upload.do"
  18.     public String upload(@RequestParam(value = "file", required = false) MultipartFile file, HttpServletRequest request, ModelMap model) { 
  19.  
  20.         System.out.println("开始"); 
  21.         String path = request.getSession().getServletContext().getRealPath("upload"); 
  22.         String fileName = file.getOriginalFilename(); 
  23. //        String fileName = new Date().getTime()+".jpg"; 
  24.         System.out.println(path); 
  25.         File targetFile = new File(path, fileName); 
  26.         if(!targetFile.exists()){ 
  27.             targetFile.mkdirs(); 
  28.         } 
  29.  
  30.         //保存 
  31.         try
  32.             file.transferTo(targetFile); 
  33.         } catch (Exception e) { 
  34.             e.printStackTrace(); 
  35.         } 
  36.         model.addAttribute("fileUrl", request.getContextPath()+"/upload/"+fileName); 
  37.  
  38.         return "result"
  39.     } 
  40.  
package com.codeif.action;

import java.io.File;
import java.util.Date;

import javax.servlet.http.HttpServletRequest;

import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;

@Controller
public class UploadAction {

    @RequestMapping(value = "/upload.do")
    public String upload(@RequestParam(value = "file", required = false) MultipartFile file, HttpServletRequest request, ModelMap model) {

        System.out.println("开始");
        String path = request.getSession().getServletContext().getRealPath("upload");
        String fileName = file.getOriginalFilename();
//        String fileName = new Date().getTime()+".jpg";
        System.out.println(path);
        File targetFile = new File(path, fileName);
        if(!targetFile.exists()){
            targetFile.mkdirs();
        }

        //保存
        try {
            file.transferTo(targetFile);
        } catch (Exception e) {
            e.printStackTrace();
        }
        model.addAttribute("fileUrl", request.getContextPath()+"/upload/"+fileName);

        return "result";
    }

}


index.jsp

  1. <%@ page pageEncoding="utf-8"%> 
  2. <!DOCTYPE html> 
  3. <html> 
  4. <head> 
  5. <meta charset="utf-8"> 
  6. <title>上传图片</title> 
  7. </head> 
  8. <body> 
  9. <form action="upload.do" method="post" enctype="multipart/form-data"> 
  10. <input type="file" name="file" /> <input type="submit" value="Submit" /></form> 
  11. </body> 
  12. </html> 
<%@ page pageEncoding="utf-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>上传图片</title>
</head>
<body>
<form action="upload.do" method="post" enctype="multipart/form-data">
<input type="file" name="file" /> <input type="submit" value="Submit" /></form>
</body>
</html>


WEB-INF/jsp/下的result.jsp

  1. <%@ page pageEncoding="utf-8"%> 
  2. <!DOCTYPE html> 
  3. <html> 
  4. <head> 
  5. <meta charset="utf-8"> 
  6. <title>上传结果</title> 
  7. </head> 
  8. <body> 
  9. <img alt="" src="${fileUrl }" /> 
  10. </body> 
  11. </html> 
<%@ page pageEncoding="utf-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>上传结果</title>
</head>
<body>
<img alt="" src="${fileUrl }" />
</body>
</html>

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