spring mvc(注解)上传文件的简单例子

痛定思痛。 2021-09-26 00:04 285阅读 0赞

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

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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.       
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****>**

applicationContext.xml

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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.        
10.     **<****bean** class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" lazy-init="false" **/>**  
11.   
12.       
13.     **<****bean** class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" **/>**  
14.   
15.       
16.     **<****bean** class="org.springframework.web.servlet.view.InternalResourceViewResolver" p:prefix="/WEB-INF/jsp/" p:suffix=".jsp" **/>**  
17.   
18.       
19.     **<****bean** id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"**/>**  
20.   
21. **</****beans****>**

codeifAction.xml

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UploadAction.java

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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.   
41. \}

index.jsp

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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

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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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