1、上传
特别需要的jar:commons-fileupload-1.3.3.jar和commons-io-2.6.jar
步骤:
①配置mvc:annotation-driven
②配置multipartResolver
③创建html页面
④创建handler
2、下载
①创建handler,方法返回值为ResponseEntity类型
②设置ResponseEntity的内容、请求头、请求状态
③把设置好的ResponseEntity对象写到返回给页面即可
3、注意事项
①要在web.xml配置HiddenHttpMethodFilter
②要在springmvc配置文件配置MultipartResolver
③提交页面的form里面需要配置enctype=”multipart/form-data”
4、web.xml
<?xml version="1.0" encoding="UTF-8"?>
<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" version="3.1">
<display-name>SpringMVC_10_UpDownload</display-name>
<servlet>
<servlet-name>springDispatcherServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:springmvc.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>springDispatcherServlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<filter>
<filter-name>HiddenHttpMethodFilter</filter-name>
<filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>HiddenHttpMethodFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
5、springmvc.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd">
<!-- 配置自动扫描包 -->
<context:component-scan base-package="com.test.springmvc"></context:component-scan>
<!-- 配置视图解析器,把handler返回值解析为实际视图 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/"></property>
<property name="suffix" value=".jsp"></property>
</bean>
<mvc:annotation-driven></mvc:annotation-driven>
<!-- 配置MultipartResolver -->
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<property name="defaultEncoding" value="UTF-8"></property>
</bean>
</beans>
6、Handler.java
package com.test.springmvc.handlers;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpSession;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;
@Controller
public class Handler {
@RequestMapping("/testUpload")
public String testUpload(@RequestParam(value="desc",required=false)String desc, @RequestParam("file")MultipartFile file){
System.out.println(desc);
if(file!=null){
BufferedReader in = null;
BufferedWriter bw = null;
try{
String path = "E:/workspace/SpringMVC_10_UpDownload/WebContent/files/";
System.out.println(file.getOriginalFilename());
in = new BufferedReader(new InputStreamReader(file.getInputStream()));
StringBuffer buffer = new StringBuffer();
String line = "";
while ((line = in.readLine()) != null){
buffer.append(line);
}
String filestr = buffer.toString();
System.out.println(filestr);
bw = new BufferedWriter(new FileWriter(path+"new"+file.getOriginalFilename(), true));
bw.write(filestr);
bw.newLine();
bw.flush();
return "redirect:/result?status=success";
}catch(Exception e){
e.getMessage();
try {
bw.close();
in.close();
} catch (IOException e1) {
e1.printStackTrace();
}
return "redirect:/result?status=fail";
}
}else{
return "redirect:/result?status=fail";
}
}
@RequestMapping("/result")
public String toResult(){
return "result";
}
@RequestMapping("/testDownload")
public ResponseEntity<byte[]> testDownload(HttpSession session) throws IOException{
byte[] body = null;
String context = "sdfasdjkahsjdkfhalksdjhfajklhjh";
ServletContext servletContext = session.getServletContext();
body = context.getBytes();
HttpHeaders headers = new HttpHeaders();
headers.add("Content-Disposition", "attachment;filename=test.txt");
HttpStatus status = HttpStatus.OK;
ResponseEntity<byte[]> responseEntity = new ResponseEntity<byte[]>(body,headers,status);
return responseEntity;
}
}
7、index.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="testUpload" method="POST" enctype="multipart/form-data">
File:<input type="file" name="file">
Desc:<input type="text" name="desc">
<input type="submit" value="submit">
</form>
<br><br>
<a href="testDownload" id="testDownload">testDownload</a>
<br><br>
1、上传<br>
特别需要的jar:commons-fileupload-1.3.3.jar和commons-io-2.6.jar<br>
步骤:<br>
①配置mvc:annotation-driven<br>
②配置multipartResolver<br>
③创建html页面<br>
④创建handler<br>
2、下载<br>
①创建handler,方法返回值为ResponseEntity类型<br>
②设置ResponseEntity的内容、请求头、请求状态<br>
③把设置好的ResponseEntity对象写到返回给页面即可<br>
</body>
</html>
8、result.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
RESULT >> <%=request.getParameter("status") %>
</body>
</html>
9、项目目录
10、demo
https://download.csdn.net/download/qq_22778717/10601174