spring mvc(注解)上传文件的简单例子

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. <listener>
5. <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
6. </listener>
7. <context-param>
8. <param-name>contextConfigLocation</param-name>
9. <param-value>
10. /WEB-INF/config/applicationContext.xml
11. /WEB-INF/config/codeifAction.xml
12. </param-value>
13. </context-param>
14. <servlet>
15. <servlet-name>dispatcherServlet</servlet-name>
16. <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
17. <init-param>
18. <param-name>contextConfigLocation</param-name>
19. <param-value>/WEB-INF/config/codeifAction.xml</param-value>
20. </init-param>
21. <load-on-startup>1</load-on-startup>
22. </servlet>
23. <!-- 拦截所有以do结尾的请求 -->
24. <servlet-mapping>
25. <servlet-name>dispatcherServlet</servlet-name>
26. <url-pattern>*.do</url-pattern>
27. </servlet-mapping>
28. <welcome-file-list>
29. <welcome-file>index.do</welcome-file>
30. </welcome-file-list>
31. </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. <!-- 启动Spring MVC的注解功能，完成请求和注解POJO的映射 -->
9. <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" lazy-init="false" />
10. <!-- 另外最好还要加入DefaultAnnotationHandlerMapping，不然会被 XML或其它的映射覆盖！ -->
11. <bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" />
12. <!-- 对模型视图名称的解析，即在模型视图名称添加前后缀 -->
13. <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" p:prefix="/WEB-INF/jsp/" p:suffix=".jsp" />
14. <!-- 支持上传文件 -->
15. <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"/>
16. </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. <bean id="uploadAction" class="com.codeif.action.UploadAction" />
8. </beans>

UploadAction.java

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

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>

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>