spring mvc(注解)上传文件的简单例子

2022-05-25 01:24:36

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>
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