上传：
- 导入需要的jar包：Spring MVC类库 + 文件上传下载需要的JAR包，图中A处为文件上传下载需要的JAR包,其余为Spring MVC类库。
- 构建领域模层：model层和control层、view层
FileController:
1 package com.controller.system;
2
3 import java.io.FileOutputStream;
4 import java.io.OutputStream;
5 import java.text.SimpleDateFormat;
6 import java.util.Date;
7
8 import javax.servlet.http.HttpServletRequest;
9 import javax.servlet.http.HttpServletResponse;
10 import javax.servlet.http.HttpSession;
11
12 import org.springframework.stereotype.Controller;
13 import org.springframework.ui.Model;
14 import org.springframework.web.bind.annotation.RequestMapping;
15 import org.springframework.web.bind.annotation.RequestMethod;
16 import org.springframework.web.multipart.MultipartHttpServletRequest;
17 import org.springframework.web.multipart.commons.CommonsMultipartFile;
18
19 import com.model.system.MyFile;
20
21 @Controller
22 @RequestMapping("fileController")
23 public class FileController {
24
25 @RequestMapping(value = "/upload.do", method = RequestMethod.POST)
26 public String upload(HttpServletRequest request, HttpServletResponse response, HttpSession session, Model model,MyFile myFile) {
27
28 try {
29 // 1. 转化request
30 MultipartHttpServletRequest rm = (MultipartHttpServletRequest) request;
31 // 2. /获得文件
32 CommonsMultipartFile cfile = (CommonsMultipartFile) rm.getFile("myUpFile");//myUpFile前端页面输入附件处input的name
33 // 3. 获得文件的字节数组
34 byte[] bytefile = cfile.getBytes();
35 // 4. 获得文件后缀名
36 String oldName = cfile.getOriginalFilename();
37 // 截取后缀名
38 String suffix = oldName.substring(oldName.lastIndexOf("."));
39 // 5. 获取项目的路径
40 String path = request.getSession().getServletContext().getRealPath("/");
41 // 6. 定义OutputStream
42 // 设置文件名：取当前时间
43 Date date = new Date();
44 SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmssSSS");
45 String filename = sdf.format(date);
46
47 String url = "\\G:\\upanddown\\upfile\\" + filename + suffix;
48 System.out.println(url);
49 OutputStream os = new FileOutputStream(url);
50
51 os.write(bytefile);
52 // 7.关闭资源
53 os.flush();
54 os.close();
55 } catch (Exception e) {
56 e.printStackTrace();
57 }
58 return "upload";
59
60 }
61 }
MyFile
1 package com.model.system;
2
3 public class MyFile {
4
5 private String fileUserName;
6 private String url;
7
8
9 public MyFile() {}
10
11 public MyFile(String fileUserName, String url) {
12 super();
13 this.fileUserName = fileUserName;
14 this.url = url;
15 }
16
17 public String getFileUserName() {
18 return fileUserName;
19 }
20
21 public void setFileUserName(String fileUserName) {
22 this.fileUserName = fileUserName;
23 }
24
25 public String getUrl() {
26 return url;
27 }
28
29 public void setUrl(String url) {
30 this.url = url;
31 }
32
33 @Override
34 public String toString() {
35 return "MyFile [fileUserName=" + fileUserName + ", url=" + url + "]";
36 }
37
38
39 }
- 设置上传页面upload的表单
- 配置web.xml和dispatcher-servlet.xml
web.xml:
1 <?xml version="1.0" encoding="UTF-8"?> 2 <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1"> 3 <display-name>springMvc_upload</display-name> 4 <servlet> 5 <servlet-name>dispatcher</servlet-name> 6 <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> 7 </servlet> 8 <servlet-mapping> 9 <servlet-name>dispatcher</servlet-name> 10 <url-pattern>*.do</url-pattern> 11 </servlet-mapping> 12 <filter> 13 <filter-name>CharacterEncodingFilter</filter-name> 14 <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> 15 <init-param> 16 <param-name>encoding</param-name> 17 <param-value>UTF-8</param-value> 18 </init-param> 19 </filter> 20 <filter-mapping> 21 <filter-name>CharacterEncodingFilter</filter-name> 22 <url-pattern>/*</url-pattern> 23 </filter-mapping> 24 <welcome-file-list> 25 <welcome-file>upload.jsp</welcome-file> 26 </welcome-file-list> 27 </web-app>
dispatcher-servlet.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:mvc="http://www.springframework.org/schema/mvc" 4 xmlns:context="http://www.springframework.org/schema/context" 5 xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" 6 xsi:schemaLocation="http://www.springframework.org/schema/beans 7 http://www.springframework.org/schema/beans/spring-beans-3.0.xsd 8 http://www.springframework.org/schema/mvc 9 http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd 10 http://www.springframework.org/schema/context 11 http://www.springframework.org/schema/context/spring-context-3.0.xsd 12 http://www.springframework.org/schema/aop 13 http://www.springframework.org/schema/aop/spring-aop-3.0.xsd 14 http://www.springframework.org/schema/tx 15 http://www.springframework.org/schema/tx/spring-tx-3.0.xsd "> 16 17 <!-- 注解驱动 --> 18 <mvc:annotation-driven /> 19 <!-- springMVC扫描驱动 --> 20 <context:component-scan base-package="com.controller.*"></context:component-scan> 21 22 <!-- 配置试图解析器 --> 23 <bean 24 class="org.springframework.web.servlet.view.InternalResourceViewResolver"> 25 <property name="prefix" value="/"></property> 26 <property name="suffix" value=".jsp"></property> 27 </bean> 28 29 <!-- 从请求和响应读取/编写字符串 --> 30 <bean id="stringConverter" 31 class="org.springframework.http.converter.StringHttpMessageConverter"> 32 <property name="supportedMediaTypes"> 33 <list> 34 <value>text/plain;charset=UTF-8</value> 35 </list> 36 </property> 37 </bean> 38 39 <!-- 用于将对象转换为 JSON --> 40 <bean id="jsonConverter" 41 class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"></bean> 42 <bean 43 class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"> 44 <property name="messageConverters"> 45 <list> 46 <ref bean="stringConverter" /> 47 <ref bean="jsonConverter" /> 48 </list> 49 </property> 50 </bean> 51 52 <!-- 上传下载配置 --> 53 <bean id="multipartResolver" 54 class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> 55 <!-- maxUploadSize:文件上传的最大值以byte为单位 --> 56 <property name="maxUploadSize" value="1024000"></property> 57 </bean> 58 59 60 </beans>
下载：
配置和上面的一样（用同一个项目），在view层中编码如下，用来下载：
1 <body>
2 <h1>文件中心</h1>
3 ${myFile}
4 <a href="<%=basePath%>fileController/download.do?url=${myFile.url}" >下载</a>
5 </body>
FileController:中添加下载方法：
1 /**
2 * 下载文件
3 * @throws IOException
4 */
5
6 @RequestMapping(value = "/download.do")
7 public void download(HttpServletRequest request,HttpServletResponse response, String url) throws IOException {
8 String strUrl = url;
9
10 // 截取字符串
11 int i = 29;
12 String urlstr = url.substring(i);
13 System.out.println("#########################___" + urlstr);
14
15 // 获取输入流
16 InputStream bis = new BufferedInputStream(new FileInputStream(new File(
17 strUrl)));
18 // 假如以中文名下载的话
19 String filename = urlstr;
20 // 转码，免得文件名中文乱码
21 filename = URLEncoder.encode(filename, "UTF-8");
22 // 设置文件下载头
23 response.addHeader("Content-Disposition", "attachment;filename="
24 + filename);
25 // 1.设置文件ContentType类型，这样设置，会自动判断下载文件类型
26 response.setContentType("multipart/form-data");
27 BufferedOutputStream out = new BufferedOutputStream(
28 response.getOutputStream());
29 int len = 0;
30 while ((len = bis.read()) != -1) {
31 out.write(len);
32 out.flush();
33 }
34 out.close();
35 }
原文地址：https://www.cnblogs.com/ynhwl/p/9649472.html
时间： 2024-07-31 13:49:13