package com.pk.web.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;
import org.springframework.web.multipart.commons.CommonsMultipartResolver;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Iterator;
@Controller
@RequestMapping("file")
public class UploadController {
@RequestMapping("/upload.do")
public String upload(HttpServletRequest request,
HttpServletResponse response) throws IOException {
// 這裏我用到了jar包
CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(
request.getSession().getServletContext());
if (multipartResolver.isMultipart(request)) {
MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest) request;
Iterator<String> iter = multiRequest.getFileNames();
while (iter.hasNext()) {
MultipartFile file = multiRequest.getFile((String) iter.next());
if (file != null) {
String fileName = file.getOriginalFilename();
String path1 = Thread.currentThread()
.getContextClassLoader().getResource("").getPath()
+ "download" + File.separator;
// 下面的加的日期是爲了防止上傳的名字一樣
String path = path1
+ new SimpleDateFormat("yyyyMMddHHmmss")
.format(new Date()) + fileName;
File localFile = new File(path);
file.transferTo(localFile);
}
}
}
return "uploadSuccess";
}
@RequestMapping("/toUpload.do")
public String toUpload() {
return "upload";
}
@RequestMapping("/download")
public String download(String fileName, HttpServletRequest request,
HttpServletResponse response) {
response.setCharacterEncoding("utf-8");
response.setContentType("multipart/form-data");
response.setHeader("Content-Disposition", "attachment;fileName="
+ fileName);
try {
String path = Thread.currentThread().getContextClassLoader()
.getResource("").getPath()
+ "download";//這個download目錄爲啥建立在classes下的
InputStream inputStream = new FileInputStream(new File(path
+ File.separator + fileName));
OutputStream os = response.getOutputStream();
byte[] b = new byte[2048];
int length;
while ((length = inputStream.read(b)) > 0) {
os.write(b, 0, length);
}
// 這裏主要關閉。
os.close();
inputStream.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
// 返回值要注意,要不然就出現下面這句錯誤!
//java+getOutputStream() has already been called for this response
return null;
}
}
springmvc配置文件:
<!-- mvc註解驅動 -->
<mvc:annotation-driven/>
<!-- 掃描器已經有了上面這個mvc註解驅動的功能了,所有不需要了 -->
<context:component-scan base-package="com.pk.web.controller" />
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<property name="defaultEncoding" value="utf-8" />
<property name="maxUploadSize" value="104857600"/>
<property name="maxInMemorySize" value="4096"/>
</bean>
<!-- 前綴+ viewName +後綴 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<!-- webroot到某一指定的文件夾的路徑 -->
<property name="prefix" value="/WEB-INF/jsp/"></property>
<!-- 自己在你的 /WEB-INF/jsp下建立給jsp見面吧。或者該我上面的配置 -->
<!-- 視圖名稱的後綴 -->
<property name="suffix" value=".jsp"></property>
</bean>
web.xml配置文件:
<servlet>
<servlet-name>springmvc</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<filter>
<filter-name>encodingFilter</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
<init-param>
<param-name>forceEncoding</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>encodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<!-- struts習慣使用/*,在springmvc不管用 -->
<url-pattern>*.do</url-pattern>
</servlet-mapping>
測試頁面代碼:
這裏是html 點擊下載,這裏就寫死了(你可以修改成你自己放的文件)。可以修改的。
<a href="file/download.do?fileName=map.txt">下載1 </a><br />
下面這裏是上傳代碼
<form action="file/upload.do" method="post" enctype="multipart/form-data">
選擇文件<input type="file" name="file">
<input type="submit" value="上傳">
</form>