阅读:66
1、Client处理 选择文件
(1)form表单 选择文件 method="post"
(2)enctype="multipart/form-data"
(3) 准备文件框<input type="file" name="upload">
2、服务端准备存储上传文件的目录 新建文件夹
项目/webapp/upload文件
3、开发文件上传Controller
public String fileUpload(MultipartFile upload){
//接收数据
//调用业务 接收的文件--》服务文件目录中 文件拷贝
upload.transforTo(new File(父目录,当前文件名))
//跳转页面
return "ok" //ok.jsp
}
4、配置文件上传解析器CommonsMultipartResolver id必须为MulyipartResolver
5、commons-fileUpload[引入] Commons-io
<!--集成springboot的父项目-->
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.2.5.RELEASE</version>
</parent>
<dependencies>
<!--引入springboot的web依赖-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!--引入jsp解析相关依赖-->
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-jasper</artifactId>
</dependency>
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.3.1</version>
</dependency>
</dependencies>
server:
port: 8080
servlet:
jsp:
init-parameters.development: true #开启jsp页面的热部署
spring:
mvc:
view:
prefix: /
suffix: .jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<html>
<head>
</head>
<body>
<form action="${pageContext.request.contextPath}/file/upload" method="post" enctype="multipart/form-data">
<input type="file" name="upload">
<input type="submit" value="上传文件">
</form>
</body>
</html>
@Controller
@RequestMapping("file")
public class upload {
@RequestMapping("upload")
public String upload(MultipartFile upload, HttpServletRequest request) throws IOException {
String realPath = request.getSession().getServletContext().getRealPath("upload");
//调用业务 文件拷贝
//处理文件名 UUID拼串=uuid+"."+扩展名
String s = UUID.randomUUID().toString().replace("-", "") + "." + FilenameUtils.getExtension(upload.getOriginalFilename());
//调用业务 文件拷贝
upload.transferTo(new File(realPath,s));
return "index";
}
}
<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<html>
<head>
</head>
<body>
<form action="${pageContext.request.contextPath}/file/upload" method="post" enctype="multipart/form-data">
<input type="file" name="upload"></br>
<input type="file" name="upload"></br>
<input type="file" name="upload">
<input type="submit" value="上传文件">
</form>
</body>
</html>
/**
* @author 王恒杰
* @date 2021/11/26 10:24
* @Description:
*/
@Controller
@RequestMapping("file")
public class upload {
@RequestMapping("upload")
public String upload(MultipartFile[] upload, HttpServletRequest request) throws IOException {
for (int i = 0; i < upload.length; i++) {
//考虑有用户没有上传文件
if(upload[i]!=null){
String realPath = request.getSession().getServletContext().getRealPath("upload");
//处理文件名 UUID拼串=uuid+"."+扩展名 对文件名定义唯一标识
String s = UUID.randomUUID().toString().replace("-", "") + "." + FilenameUtils.getExtension(upload[i].getOriginalFilename());
//调用业务 文件拷贝
upload[i].transferTo(new File(realPath,s));
}
}
return "index";
}
}
application.yml
中对文件大小进行设置#修改文件上传大小的限制
servlet:
multipart:
max-file-size: 209715200 #用来控制文件的上传
max-request-size: 209715200 #用来指定服务端最大文件大小
application.properties
#修改文件上传的大小限制
#设置上传的文件大小
spring.servlet.multipart.max-file-size=100MB
#设置请求携带数据的大小
spring.servlet.multipart.max-request-size=100MB
(1)在服务端文件系统中存储可以供下载的文件
项目/webapp/download
aa.txt
bb.txt
(2)在Client提供可以下载链接
<a href="/项目名/file/download?fileName=aa.txt">下载 aa.txt</a>
(3)开发文件下载Controller
public String downLoad(String fileName,HttpRequest request,HttpResponse response){
//接收数据 要下载的文件名
//调用业务 服务器文件---》Client
a、根据文件名去服务器上加载对应文件 输入流
InputStream is=new FileInputStream(new File(request.getSession().getServletVContext().getRealPath("/download"),fileName));
b、获取响应输出流
PrintWriter out= response.getWriter();
c、文件下载的方式 inline:浏览器尝试打开,默认形式 attachment:附件形式下载
response.setHeader("content-disposition","attachment;filename="+ERLEncoder.encode(fileName,"UTF-8"))
d、拷贝文件
IOutil.copy(加载文件的输入流,响应输出流)
e、关闭资源
IoUtil.
//跳转页面
return null;
}
<!--集成springboot的父项目-->
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.2.5.RELEASE</version>
</parent>
<dependencies>
<!--引入springboot的web依赖-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!--引入jsp解析相关依赖-->
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-jasper</artifactId>
</dependency>
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.3.1</version>
</dependency>
</dependencies>
server:
port: 8080
servlet:
jsp:
init-parameters.development: true #开启jsp页面的热部署
spring:
mvc:
view:
prefix: /
suffix: .jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<html>
<body>
<h1>文件上传</h1>
<a href="${pageContext.request.contextPath}/file/download?fileName=a.txt">下载 a.txt</a>
<a href="${pageContext.request.contextPath}/file/download?fileName=b.txt">下载 b.txt</a>
</body>
</html>
@Controller
@RequestMapping("file")
public class upload {
@RequestMapping("download")
public String download(String fileName, HttpServletRequest request, HttpServletResponse response) throws IOException {
//接收数据 文件名
//文件下载
//1、加载服务器指定名
String realPath = request.getSession().getServletContext().getRealPath("/download");
FileInputStream is = new FileInputStream(new File(realPath, fileName));
//2、设置文件下载方式
response.setHeader("content-disposition","attachment;filename="+ URLEncoder.encode(fileName,"utf-8"));
//3、获取响应输出流
PrintWriter writer = response.getWriter();
//4、流数据交换
IOUtils.copy(is,writer);
//5、关闭资源
IOUtils.closeQuietly(is);
IOUtils.closeQuietly(writer);
return null;
}