java 写个controller下载文件（word）；两种方式

 java 读取某路径下的文件直接相应到前端页面！

前端请求方式为get请求，只需要写个个按标签点击即可下载

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import java.io.BufferedInputStream; import java.io.BufferedOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse;   import org.harry.dandelion.framework.common.utils.StringUtil; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.beans.factory.annotation.Value; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RestController;   import com.sinosoft.ssi.base.entity.ReportEntity; import com.sinosoft.ssi.base.mappers.ReportMapper; import lombok.extern.slf4j.Slf4j;   @Slf4j @RestController public class ReportOutWord {            @Autowired     private ReportMapper RrportMapper;       @GetMapping("/exp/outWord/1")     public void download(HttpServletRequest request, HttpServletResponse response) {         String path= " ";                          // 开始下载文件             try {                 // path是指欲下载的文件的路径。                 File file = new File(path);                 // 取得文件名。                 String filename = file.getName();                 // 取得文件的后缀名。                 String ext = filename.substring(filename.lastIndexOf(".") + 1).toUpperCase();                 log.debug("下载文件类型为：" + ext);                                              // 以流的形式下载文件。                                            InputStream fis = new BufferedInputStream( new FileInputStream(path));                     byte[] buffer = new byte[fis.available()];                     fis.read(buffer);                     fis.close();                     // 清空response                     response.reset();                     // 设置response的Header //ISO-8859-1可以显示中文的文件名                     response.addHeader("Content-Disposition", "attachment;filename=" + new String(filename.getBytes(),"ISO-8859-1"));                     response.addHeader("Content-Length", "" + file.length());                     OutputStream toClient = new BufferedOutputStream(response.getOutputStream());                     response.setContentType("application/octet-stream");                     toClient.write(buffer);                     toClient.flush();                     toClient.close();                     // 删除临时文件                     //FileUtils.delFile(rootPath + File.separator + filename);                     // TODO Auto-generated catch block             } catch (IOException ex) {                 ex.printStackTrace();             }       } }

　　方式二：

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// 开始下载文件     InputStream in = null;     try {         // 1.设置文件ContentType类型，这样设置，会自动判断下载文件类型         response.setContentType("multipart/form-data");         // 2.设置文件头：最后一个参数是设置下载文件名                    response.addHeader("Content-Disposition",                 "attachment;filename=" + new String("*******.docx".getBytes(), "ISO-8859-1"));           in = new FileInputStream(new File(文件路径));           // 3.通过response获取ServletOutputStream对象(out)         int b = 0;         byte[] buffer = new byte[512];         while (b != -1) {             b = in.read(buffer);             if (b != -1) {                 response.getOutputStream().write(buffer, 0, b);// 4.写到输出流(out)中             }           }     } catch (Exception e) {     } finally {         try {             if (in != null) {                 in.close();             }             response.getOutputStream().flush();                                       } catch (IOException e) {             e.printStackTrace();         }     }