springMVC实现文件下载（附带Servlet方式）

拼搏现实的明天。 2022-06-16 13:49 178阅读 0赞

# 一、Servlet实现方式 #

import java.io.File;
    import java.io.IOException;
    import java.io.OutputStream;
    
    import javax.servlet.http.HttpServletResponse;
    
    import org.apache.commons.io.FileUtils;
    
    public class MyController {
        public static void downLoadFile(HttpServletResponse response, File file) {
            if (file == null || !file.exists()) {
                return;
            }
            OutputStream out = null;
            try {
                response.reset();
                response.setContentType("application/octet-stream; charset=utf-8");
                response.setHeader("Content-Disposition", "attachment; filename=" + file.getName());
                out = response.getOutputStream();
                out.write(FileUtils.readFileToByteArray(file));
                out.flush();
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                if (out != null) {
                    try {
                        out.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }
        }
    
    }

# 二、SpringMVC方式 #

public ResponseEntity<byte[]> download(String fileName, File file) throws IOException {
            String dfileName = new String(fileName.getBytes("gb2312"), "iso8859-1");
            HttpHeaders headers = new HttpHeaders();
            headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
            headers.setContentDispositionFormData("attachment", dfileName);
            return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(file), headers, HttpStatus.CREATED);
        }

需要加入乱码配置：

<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"> 
     <property name="messageConverters"> 
      <list>
       <bean class="org.springframework.http.converter.ByteArrayHttpMessageConverter" />
       <bean id="stringHttpMessageConverter" class="org.springframework.http.converter.StringHttpMessageConverter"> 
        <property name="supportedMediaTypes">
             <list>
              <value>text/plain;charset=UTF-8</value>
             </list>
        </property>
       </bean>
      </list>
     </property> 
    </bean>