SpringMVC:上传与下载

桃扇骨 2022-09-25 04:17 181阅读 0赞

注意事项:   
1 springmvc.xml必须配置:

Java代码   [![收藏代码][icon_star.png]][icon_star.png 1]

1.  <bean id="multipartResolver"  
2.          class="org.springframework.web.multipart.commons.CommonsMultipartResolver" p:defaultEncoding="utf-8"/>

2 WEB-INF/lib下必加入:commons-fileupload.jar与commons-io-1.4.jar二个文件   
3 表单属性为: enctype="multipart/form-data"   
工程项目图片如下:   
![6744da1e-56fe-3b9c-96e3-265038d7e80f.jpg][]  
具体代码如下:   
FileUploadBean.java

Java代码   [![收藏代码][icon_star.png]][icon_star.png 1]

1.  public class FileUploadBean \{     
2.      private byte\[\] file;  
3.    
4.      public void setFile(byte\[\] file) \{  
5.          this.file = file;  
6.      \}  
7.    
8.      public byte\[\] getFile() \{  
9.          return file;  
10.     \}  
11. \}

Java代码   [![收藏代码][icon_star.png]][icon_star.png 1]

1.  package net.liuzd.web;  
2.    
3.  import java.io.BufferedInputStream;  
4.  import java.io.BufferedOutputStream;  
5.  import java.io.File;  
6.  import java.io.FileInputStream;  
7.  import java.io.IOException;  
8.  import java.net.BindException;  
9.  import java.util.ArrayList;  
10.   
11. import java.util.List;  
12. import java.util.Map;  
13.   
14. import javax.servlet.http.HttpServletRequest;  
15. import javax.servlet.http.HttpServletResponse;  
16.   
17. import org.springframework.stereotype.Controller;  
18. import org.springframework.util.FileCopyUtils;  
19. import org.springframework.web.bind.annotation.PathVariable;  
20. import org.springframework.web.bind.annotation.RequestMapping;  
21. import org.springframework.web.bind.annotation.RequestMethod;  
22. import org.springframework.web.bind.annotation.RequestParam;  
23. import org.springframework.web.multipart.MultipartFile;  
24. import org.springframework.web.multipart.MultipartHttpServletRequest;  
25. import org.springframework.web.multipart.commons.CommonsMultipartFile;  
26. import org.springframework.web.servlet.ModelAndView;  
27.   
28. /\*\* 
29.  \* Title: Description: Copyright: Copyright (c) 2011 
30.  \* Company:http://liuzidong.iteye.com/ Makedate:2011-5-27 下午01:52:17 
31.  \*  
32.  \* @author liuzidong 
33.  \* @version 1.0 
34.  \* @since 1.0 
35.  \*  
36.  \*/  
37. @Controller  
38. public class FileUploadController \{  
39.   
40.     @RequestMapping(value = "/upload", method = RequestMethod.POST)  
41.     public ModelAndView onSubmit(HttpServletRequest request,  
42.             HttpServletResponse response, BindException errors)  
43.             throws Exception \{  
44.   
45.         MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;  
46.         CommonsMultipartFile file = (CommonsMultipartFile) multipartRequest  
47.                 .getFile("file");  
48.   
49.         String name = multipartRequest.getParameter("name");  
50.         System.out.println("name: " + name);  
51.         // 获得文件名：  
52.         String realFileName = file.getOriginalFilename();  
53.         System.out.println("获得文件名：" + realFileName);  
54.         // 获取路径  
55.         String ctxPath = request.getSession().getServletContext().getRealPath(  
56.                 "/")  
57.                 + "images/";  
58.         // 创建文件  
59.         File dirPath = new File(ctxPath);  
60.         if (!dirPath.exists()) \{  
61.             dirPath.mkdir();  
62.         \}  
63.         File uploadFile = new File(ctxPath + realFileName);  
64.         FileCopyUtils.copy(file.getBytes(), uploadFile);  
65.         request.setAttribute("files", loadFiles(request));  
66.         return new ModelAndView("success");  
67.     \}  
68.   
69.     @RequestMapping(value = "/upload2", method = RequestMethod.POST)  
70.     public ModelAndView onSubmit2(HttpServletRequest request,  
71.             HttpServletResponse response, BindException errors)  
72.             throws Exception \{  
73.   
74.         // 转型为MultipartHttpRequest  
75.         MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;  
76.         // 根据前台的name名称得到上传的文件  
77.         MultipartFile file = multipartRequest.getFile("file");  
78.         // 获得文件名：  
79.         String realFileName = file.getOriginalFilename();  
80.         // 获取路径  
81.         String ctxPath = request.getSession().getServletContext().getRealPath(  
82.                 "/")  
83.                 + "\\\\" + "images\\\\";  
84.         // 创建文件  
85.         File dirPath = new File(ctxPath);  
86.         if (!dirPath.exists()) \{  
87.             dirPath.mkdir();  
88.         \}  
89.         File uploadFile = new File(ctxPath + realFileName);  
90.         FileCopyUtils.copy(file.getBytes(), uploadFile);  
91.         request.setAttribute("files", loadFiles(request));  
92.         return new ModelAndView("success");  
93.     \}  
94.   
95.     @RequestMapping(value = "/upload3", method = RequestMethod.POST)  
96.     public String upload(@RequestParam("file")  
97.     MultipartFile image, HttpServletRequest request) throws IOException \{  
98.   
99.         String ctxPath = request.getSession().getServletContext().getRealPath(  
100.                 "/")  
101.                 + "\\\\" + "images\\\\";  
102.         System.out.println("路径：" + ctxPath);  
103.         File file = new File(ctxPath + "/" + image.getOriginalFilename());  
104.         // FileCopyUtils.copy(image.getBytes(),new  
105.         // File(ctxPath+"/"+image.getOriginalFilename()));  
106.         try \{  
107.             image.transferTo(file); // 保存上传的文件  
108.         \} catch (IllegalStateException e) \{  
109.             e.printStackTrace();  
110.         \} catch (IOException e) \{  
111.             e.printStackTrace();  
112.         \}  
113.         request.setAttribute("files", loadFiles(request));  
114.         return "success";  
115.     \}  
116.   
117.     // 多文件上传  
118.     @RequestMapping(value = "/upload4", method = RequestMethod.POST)  
119.     public ModelAndView fileUpload(HttpServletRequest request,  
120.             HttpServletResponse response, BindException errors)  
121.             throws Exception \{  
122.   
123.         MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;  
124.         Map<String, MultipartFile> fileMap = multipartRequest.getFileMap();  
125.         String ctxPath = request.getSession().getServletContext().getRealPath(  
126.                 "/")  
127.                 + "\\\\" + "images\\\\";  
128.   
129.         File file = new File(ctxPath);  
130.         if (!file.exists()) \{  
131.             file.mkdir();  
132.         \}  
133.         String fileName = null;  
134.         for (Map.Entry<String, MultipartFile> entity : fileMap.entrySet()) \{  
135.             // 上传文件名  
136.             // System.out.println("key: " + entity.getKey());  
137.             MultipartFile mf = entity.getValue();  
138.             fileName = mf.getOriginalFilename();  
139.             File uploadFile = new File(ctxPath + fileName);  
140.             FileCopyUtils.copy(mf.getBytes(), uploadFile);  
141.         \}  
142.         request.setAttribute("files", loadFiles(request));  
143.         return new ModelAndView("success");  
144.     \}  
145.   
146.     // @ModelAttribute("files")//此属性用于初始类时调用,但上传文件后不能时时反应上传文件个数,不适合动态数据  
147.     public List<String> loadFiles(HttpServletRequest request) \{  
148.         List<String> files = new ArrayList<String>();  
149.         String ctxPath = request.getSession().getServletContext().getRealPath(  
150.                 "/")  
151.                 + "\\\\" + "images\\\\";  
152.         File file = new File(ctxPath);  
153.         if (file.exists()) \{  
154.             File\[\] fs = file.listFiles();  
155.             String fname = null;  
156.             for (File f : fs) \{  
157.                 fname = f.getName();  
158.                 if (f.isFile()) \{  
159.                     files.add(fname);  
160.                 \}  
161.             \}  
162.         \}  
163.         return files;  
164.     \}  
165.   
166.     @RequestMapping("/download/\{fileName\}")  
167.     public ModelAndView download(@PathVariable("fileName")  
168.     String fileName, HttpServletRequest request, HttpServletResponse response)  
169.             throws Exception \{  
170.   
171.         response.setContentType("text/html;charset=utf-8");  
172.         request.setCharacterEncoding("UTF-8");  
173.         java.io.BufferedInputStream bis = null;  
174.         java.io.BufferedOutputStream bos = null;  
175.   
176.         String ctxPath = request.getSession().getServletContext().getRealPath(  
177.                 "/")  
178.                 + "\\\\" + "images\\\\";  
179.         String downLoadPath = ctxPath + fileName;  
180.         System.out.println(downLoadPath);  
181.         try \{  
182.             long fileLength = new File(downLoadPath).length();  
183.             response.setContentType("application/x-msdownload;");  
184.             response.setHeader("Content-disposition", "attachment; filename="  
185.                     + new String(fileName.getBytes("utf-8"), "ISO8859-1"));  
186.             response.setHeader("Content-Length", String.valueOf(fileLength));  
187.             bis = new BufferedInputStream(new FileInputStream(downLoadPath));  
188.             bos = new BufferedOutputStream(response.getOutputStream());  
189.             byte\[\] buff = new byte\[2048\];  
190.             int bytesRead;  
191.             while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) \{  
192.                 bos.write(buff, 0, bytesRead);  
193.             \}  
194.         \} catch (Exception e) \{  
195.             e.printStackTrace();  
196.         \} finally \{  
197.             if (bis != null)  
198.                 bis.close();  
199.             if (bos != null)  
200.                 bos.close();  
201.         \}  
202.         return null;  
203.     \}  
204. \}

spring.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"  
4.      xmlns:p="http://www.springframework.org/schema/p"  
5.      xmlns:context="http://www.springframework.org/schema/context"     
6.      xsi:schemaLocation="  
7.          http://www.springframework.org/schema/beans   
8.          http://www.springframework.org/schema/beans/spring-beans-3.0.xsd  
9.          http://www.springframework.org/schema/context   
10.         http://www.springframework.org/schema/context/spring-context-3.0.xsd">  
11.       
15.     <context:component-scan base-package="net.liuzd.web" />  
16.   
17.       
18.     <bean  
19.         class="org.springframework.web.servlet.view.InternalResourceViewResolver"  
20.         p:prefix="/WEB-INF/jsp/" p:suffix=".jsp" />  
21.   
22.      
23.     <bean id="multipartResolver"  
24.         class="org.springframework.web.multipart.commons.CommonsMultipartResolver" p:defaultEncoding="utf-8">  
25.         <property name="maxUploadSize">  
26.             <value>104857600</value>  
27.         </property>  
28.         <property name="maxInMemorySize">  
29.             <value>4096</value>  
30.         </property>  
31.     </bean>  
32. </beans>

success.jsp

Java代码   [![收藏代码][icon_star.png]][icon_star.png 1]

1.  <%@ taglib  prefix="c" uri="/WEB-INF/c.tld"%>  
2.  <h1>Upload Successful</h1>  
3.      <c:forEach var="month" items="$\{files\}">  
4.          <li><a href="pageContext.request.contextPath/download/ pageContext.request.contextPath/download/\{month\}.do">$\{month\}</a></li>  
5.      </c:forEach>  
6.    <hr><br>  
7.    <a href="$\{pageContext.request.contextPath\}/index.jsp">返回</a>

web.xml

Java代码   [![收藏代码][icon_star.png]][icon_star.png 1]

1.  <?xml version="1.0" encoding="UTF-8"?>  
2.  <web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"  
3.      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
4.      xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee   
5.      http://java.sun.com/xml/ns/j2ee/web-app\_2\_4.xsd">  
6.        
7.      <context-param>  
8.          <param-name>log4jConfigLocation</param-name>  
9.          <param-value>/WEB-INF/classes/log4j.properties</param-value>  
10.     </context-param>  
11.   
12.     <context-param>  
13.         <param-name>log4jRefreshInterval</param-name>  
14.         <param-value>60000</param-value>  
15.     </context-param>  
16.     <context-param>  
17.         <param-name>log4jExposeWebAppRoot</param-name>  
18.         <param-value>false</param-value>  
19.     </context-param>  
20.   
21.     <listener>  
22.         <listener-class>  
23.             org.springframework.web.util.Log4jConfigListener  
24.         </listener-class>  
25.     </listener>  
26.   
27.     <filter>  
28.         <filter-name>encodingFilter</filter-name>  
29.         <filter-class>  
30.             org.springframework.web.filter.CharacterEncodingFilter  
31.         </filter-class>  
32.         <init-param>  
33.             <param-name>encoding</param-name>  
34.             <param-value>UTF-8</param-value>  
35.         </init-param>  
36.         <init-param>  
37.             <param-name>forceEncoding</param-name>  
38.             <param-value>false</param-value>  
39.         </init-param>  
40.     </filter>  
41.   
42.     <filter-mapping>  
43.         <filter-name>encodingFilter</filter-name>  
44.         <url-pattern>\*.do</url-pattern>  
45.     </filter-mapping>  
46.   
47.     <filter-mapping>  
48.         <filter-name>encodingFilter</filter-name>  
49.         <url-pattern>\*.jsp</url-pattern>  
50.     </filter-mapping>  
51.   
52.     <servlet>  
53.         <servlet-name>springmvc</servlet-name>  
54.         <servlet-class>  
55.             org.springframework.web.servlet.DispatcherServlet  
56.         </servlet-class>  
57.         <init-param>  
58.             <param-name>contextConfigLocation</param-name>  
59.             <param-value>classpath:springmvc.xml</param-value>  
60.         </init-param>  
61.         <load-on-startup>1</load-on-startup>  
62.     </servlet>  
63.   
64.     <servlet-mapping>  
65.         <servlet-name>springmvc</servlet-name>  
66.         <url-pattern>\*.do</url-pattern>  
67.     </servlet-mapping>  
68.     <welcome-file-list>  
69.         <welcome-file>index.jsp</welcome-file>  
70.     </welcome-file-list>  
71. </web-app>

[icon_star.png]: http://liuzidong.iteye.com/images/icon_star.png
[icon_star.png 1]: /images/20220718/39eef21e34364adfa07d9ef329a370fa.png
[6744da1e-56fe-3b9c-96e3-265038d7e80f.jpg]: /images/20220718/7e734762f7014ec392ca8f8b46a563d8.png