![]()
步驟![]()
1、寫一個頁面（和前面文件下載的頁面寫在一起jsp文件下載）
<%@ 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>
<a href="download?fileName=a.txt">下載</a>
<form action="upload" enctype="multipart/form-data" method="post">
姓名:<input type="text" name="name"/><br/>
文件:<input type="file" name="file"/><br/>
<input type="submit" value="提交"/>
</form>
</body>
</html>
2、配置web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
<!-- 配置前端控制器 -->
<!-- 配置前端控制器 -->
<servlet>
<servlet-name>jqk</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applictionContext.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>jqk</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
3、導入jar包。由於我用的是springmvc。利用maven注入
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.nfha.wyz</groupId>
<artifactId>wyz</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>war</packaging>
<name>wyz Maven Webapp</name>
<!-- FIXME change it to the project's website -->
<url>http://www.example.com</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.7</maven.compiler.source>
<maven.compiler.target>1.7</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
<!--文件下載包-->
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>2.6</version>
</dependency>
<!--spring-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>4.1.7.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
<version>4.1.7.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>4.1.7.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>4.1.7.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context-support</artifactId>
<version>4.1.7.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>4.1.7.RELEASE</version>
</dependency>
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.3.1</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>4.1.7.RELEASE</version>
</dependency>
</dependencies>
<build>
<finalName>wyz</finalName>
<pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
<plugins>
<plugin>
<artifactId>maven-clean-plugin</artifactId>
<version>3.1.0</version>
</plugin>
<!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging -->
<plugin>
<artifactId>maven-resources-plugin</artifactId>
<version>3.0.2</version>
</plugin>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.0</version>
</plugin>
<plugin>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.22.1</version>
</plugin>
<plugin>
<artifactId>maven-war-plugin</artifactId>
<version>3.2.2</version>
</plugin>
<plugin>
<artifactId>maven-install-plugin</artifactId>
<version>2.5.2</version>
</plugin>
<plugin>
<artifactId>maven-deploy-plugin</artifactId>
<version>2.8.2</version>
</plugin>
</plugins>
</pluginManagement>
</build>
</project>
4、配置applicationContext.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:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
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.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd">
<!--掃描註解-->
<context:component-scan base-package="com.nfha.controller"></context:component-scan>
<!--註解驅動-->
<mvc:annotation-driven></mvc:annotation-driven>
<!--靜態資源-->
<mvc:resources location="/files/" mapping="/files/**"></mvc:resources>
<!-- MultipartResovler解析器 -->
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<property name="maxUploadSize" value="10000000"></property>
</bean>
</beans>
5、寫controller
package com.nfha.controller;
import org.apache.commons.io.FileUtils;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.multipart.MultipartFile;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.UUID;
@Controller
public class DemoController {
@RequestMapping("download")
public void downlode(String fileName, HttpServletResponse res, HttpServletRequest req)throws IOException {
System.out.print("進入後臺");
//設置響應流中文件進行下載
res.setHeader("Content-Disposition", "attachment;filename="+fileName);
//把二進制流放入到響應體中.
ServletOutputStream out=res.getOutputStream();
String path = req.getServletContext().getRealPath("files");
System.out.println(path);
File file = new File(path, fileName);
byte []bytes= FileUtils.readFileToByteArray(file);
out.write(bytes);
out.flush();
out.close();
}
@RequestMapping("upload")
public String upload(MultipartFile file, String name) throws IOException{
String fileName = file.getOriginalFilename();
String suffix = fileName.substring(fileName.lastIndexOf("."));
//判斷上傳文件類型
if(suffix.equalsIgnoreCase(".png")||0==0){
String uuid = UUID.randomUUID().toString();
System.out.print("值爲："+uuid);
FileUtils.copyInputStreamToFile(file.getInputStream(), new File("d:/"+uuid+suffix));
return "/index.jsp";
}else{
return "error.jsp";
}
}
}
ok 結束了。此項目包含了文件下載和上傳。
來看看上傳完成的截圖吧。
over，有什麼不懂可以email我：[email protected]
