springboot文件下载

1.创建springboot项目，结构如下：

    注意：为测试我们需要在webapp下download中自己添加一些文件

      

 

2. 代码部分

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import org.apache.tomcat.util.http.fileupload.IOUtils; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping;   import javax.servlet.ServletOutputStream; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.net.URLEncoder;   @Controller @RequestMapping("download") public class DownController {       @RequestMapping("text")     public String down(String fileName, HttpServletRequest request, HttpServletResponse response) throws IOException {         System.out.println("表单传来的名"+fileName);           //获取文件地址         String realPath = request.getSession(true).getServletContext().getRealPath("download");           //把服务器中文件读取到内存中         FileInputStream fis = new FileInputStream(new File(realPath,fileName));         //设置下载的类型         response.setHeader("content-disposition","attachment;fileName="+ URLEncoder.encode(fileName,"UTF-8"));         //获取输出流         ServletOutputStream os = response.getOutputStream();         //复制         IOUtils.copy(fis,os);         //关闭资源         fis.close();         os.close();           return null;     }   }

3. index.jsp

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<%@ page pageEncoding="UTF-8" isELIgnored="false"  %>   <a href="${pageContext.request.contextPath}/download/text?fileName=a.txt">a.txt</a> </br> <a href="${pageContext.request.contextPath}/download/text?fileName=aa唐三.docx">aa唐三.docx</a>

4. pom.xml

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<!--父级项目依赖--> <parent>   <groupId>org.springframework.boot</groupId>   <artifactId>spring-boot-starter-parent</artifactId>   <version>2.2.5.RELEASE</version> </parent>   <dependencies>     <!--web支持的jar springboot的启动器-->   <dependency>     <groupId>org.springframework.boot</groupId>     <artifactId>spring-boot-starter-web</artifactId>   </dependency>   <!--JSP解析依赖-->   <dependency>     <groupId>org.apache.tomcat.embed</groupId>     <artifactId>tomcat-embed-jasper</artifactId>   </dependency>       <!--war包-->   <!--去掉内嵌tomcat-->   <dependency>     <groupId>org.springframework.boot</groupId>     <artifactId>spring-boot-starter-tomcat</artifactId>     <scope>provided</scope>   </dependency>     <!--去掉使用内嵌tomcat解析jsp-->   <dependency>     <groupId>org.apache.tomcat.embed</groupId>     <artifactId>tomcat-embed-jasper</artifactId>     <scope>provided</scope>   </dependency>   </dependencies>

5. application.properties

spring.mvc.view.prefix=/
spring.mvc.view.suffix=.jsp

6.启动项目，访问项目接口 会跳转到 jsp页面