Controller:
@ApiOperation(value="常用接口，dfs文件下载，页面直接调用", notes="null")
@GetMapping(value = "/dfsdownload/{id}")
public ItsResultDto dfsDownload(HttpServletResponse response, @PathVariable("id") String id) {
ItsResultDto result = new ItsResultDto();//返回值
String UserAgent = this.getUserAgent();//浏览器标识，通常为msie
FileDto detildto = BeanMapper.map(fileAS.getDetail(id), FileDto.class);//根据id查询文件信息。不用BeanMapper转换，直接使用也行。此处是为了代码规范，转成了detildto，其实一样的。
if (StringUtils.isEmpty(detildto) || detildto.getIsdeleted().equals(Constant.IS_DELETE)) {
result.setCode(FileResultCodeEnum.NOTEXISTERROR.getCode());
result.setMessage(FileResultCodeEnum.NOTEXISTERROR.getMessage());
return result;
} else {
// 获取IP
InetAddress inetAddress = null;
try {
inetAddress = InetAddress.getLocalHost();
while (StringUtils.isEmpty(inetAddress)) {
inetAddress = InetAddress.getLocalHost();
System.out.println("tr00000+" + inetAddress);
}
} catch (UnknownHostException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
String ip = inetAddress.getHostAddress().toString();
System.out.println("00000000000+" + ip);
System.out.println("00000000000+" + ip);
// int port=request.getServerPort();
detildto.setPath(ip + ":" + "8083");
DownloadDto downloaddto = new DownloadDto();
String fileName = null;
String filePath = null;
if (StringUtils.isEmpty(detildto)) {
} else {
fileAS.addcount(id);//在数据库中，给这条文件下载数+1的业务
downloaddto.setFileName(detildto.getFilename());
downloaddto.setFilePath(detildto.getPath());
fileName = detildto.getFilename();// +"."+detildto.getData().getType();
filePath = detildto.getFakepath();//在dfs中文件的路径，例如：group1/M00/00/04/rBAh2lut3hCAGcOfAABuADP3meg336.xls
}
response.setCharacterEncoding("UTF-8");
response.setContentType("application/force-download");
try {
// fastDFSClient.dfsdownload(response, path, fileName,UserAgent);
fastDFSClient.downloadFile(response, filePath, fileName, UserAgent);//方法在下方给出，直接粘到FastDFSClient中即可用。不知道FastDFSClient的，请查看本专栏中的‘构建FastDFS的client’一文
result.setCode(ResultCodeEnum.SUCCESS.getCode());
result.setMessage(ResultCodeEnum.SUCCESS.getMessage());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
result.setCode(ResultCodeEnum.FAIL.getCode());
result.setMessage(ResultCodeEnum.FAIL.getMessage());
}
return result;
}
}
在FastDFSClient中加入下方方法：
/**
* 下载文件
*
* @param fileId
* 文件ID（上传文件成功后返回的ID）
* @param outFile
* 文件下载保存位置
* @return
*/
public void downloadFile(HttpServletResponse response, String filePath, String fileName,String UserAgent) throws IOException {
BufferedInputStream bis = null;
OutputStream outs = null;// 获取文件输出IO流
BufferedOutputStream os = null; // 输出流
// 本地文件位置
// String local = "D:/downloadtest/test.jpg";
byte[] buffer = new byte[1024];
String path=filePath.substring(filePath.indexOf("/")+1,filePath.length());
String group=filePath.substring(0,filePath.indexOf("/"));
File targetFile = new File(path);
if (!targetFile.exists()) {
targetFile.mkdirs();
}
// System.out.println("1111111111+"+fileName.toString());
// ((HttpServletResponse) response).setHeader("Content-Disposition",
// "attachment;filename="+new String(fileName.getBytes("utf-8"),"iso-8859-1"));
//String userAgent = response.getHeader("User-Agent").toLowerCase();
//String outpath=dfsPortl+"/"+filePath;
try {
if (UserAgent.contains("MSIE") || UserAgent.contains("like Gecko") ) {
// win10 ie edge 浏览器 和其他系统的ie
fileName = URLEncoder.encode(fileName, "UTF-8");
} //else {
// fe
// fileName = new String(fileName.getBytes("UTF-8"), "iso-8859-1");
//}
response.setHeader("Content-Disposition",
"attachment;filename=" + new String(fileName.getBytes("utf-8"), "iso-8859-1"));
response.setHeader("Access-Control-Expose-Headers", "Content-Disposition");
//byte[] content = storageClient1.download_file("group1", "M00/00/00/rBCuaV2IeB6AHY6OAAzodRl2Jqw478.jpg");
byte[] content = storageClient1.download_file(group, path);
InputStream inputStream = new ByteArrayInputStream(content);
try {
outs = response.getOutputStream();// 获取文件输出IO流
os = new BufferedOutputStream(outs);
bis = new BufferedInputStream(inputStream);
int i;
while ((i = bis.read(content)) != -1) {
os.write(content, 0, i);
}
os.flush();
os.close();
bis.close();
} catch (Exception e) {
e.printStackTrace();
} finally {
os.flush();
os.close();
bis.close();
}
//fis.read();
//fos = new FileOutputStream(path);
// fos.read();
//BufferedOutputStream bos = new BufferedOutputStream(fos);
//BufferedInputStream bis = new BufferedInputStream(fis);
//IOUtils.writeChunked(content, fos);
/*
* byte[] by = storageClient1.download_file1(fileId); // 将数据写入输出流
* IOUtils.write(by, new FileOutputStream(local));
*/
// return 0;
/*
* byte[] content = storageClient1.download_file1(filePath); fos =
* response.getOutputStream(); fis = new FileInputStream(file); bis = new
* BufferedInputStream(fis); //IOUtils.copy(content,fos); fos.write(content);
* int i = bis.read(content); while(i != -1){ fos.write(content); i =
* bis.read(content); } //IOUtils.writeChunked(content, fos);
*/
} catch (Exception e) {
e.printStackTrace();
} /*finally {
if (fos != null) {
try {
fos.flush();
fos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}*/
// return -1;
}
上方就是全部核心代码，业务逻辑可以根据自己的需要修改。为了方便可能有人跟我业务差不多，特贴出本文所使用的dto:
package com.***.***.file.interfaces.dto;
import java.math.*;
import java.io.*;
import io.swagger.annotations.*;
import java.util.*;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.multipart.MultipartFile;
@ApiModel(description ="")
public class FileDto {
private static final long serialVersionUID = 1L;
@ApiModelProperty(value="", required=false)
private String fileuid;
@ApiModelProperty(value="", required=false)
private String tenantid;
@ApiModelProperty(value="", required=false)
private String filename;
@ApiModelProperty(value="", required=false)
private String uploaderno;
@ApiModelProperty(value="", required=false)
private String uploadername;
@ApiModelProperty(value="", required=false)
private Long size;
@ApiModelProperty(value="", required=false)
private Integer downloadcount;
@ApiModelProperty(value="", required=false)
private String description;
@ApiModelProperty(value="", required=false)
private String type;
@ApiModelProperty(value="", required=false)
private String path;
@ApiModelProperty(value="", required=false)
private String fakepath;
@ApiModelProperty(value="", required=false)
private String isauth;
@ApiModelProperty(value="", required=false)
private String isdeleted;
@ApiModelProperty(value="", required=false)
private String uploadtime;
@ApiModelProperty(value="", required=false)
private String remark;
@ApiModelProperty(value="", required=false)
private String tagname;
/**
* @return String
*/
public String getFileuid() {
return fileuid;
}
/**
* @param String
*/
public void setFileuid(String fileuid) {
this.fileuid = fileuid;
}
/**
* @return String
*/
public String getTenantid() {
return tenantid;
}
/**
* @param String
*/
public void setTenantid(String tenantid) {
this.tenantid = tenantid;
}
/**
* @return String
*/
public String getFilename() {
return filename;
}
/**
* @param String
*/
public void setFilename(String filename) {
this.filename = filename;
}
/**
* @return String
*/
public String getUploaderno() {
return uploaderno;
}
/**
* @param String
*/
public void setUploaderno(String uploaderno) {
this.uploaderno = uploaderno;
}
/**
* @return String
*/
public String getUploadername() {
return uploadername;
}
/**
* @param String
*/
public void setUploadername(String uploadername) {
this.uploadername = uploadername;
}
/**
* @return Long
*/
public Long getSize() {
return size;
}
/**
* @param Long
*/
public void setSize(Long size) {
this.size = size;
}
/**
* @return Integer
*/
public Integer getDownloadcount() {
return downloadcount;
}
/**
* @param Integer
*/
public void setDownloadcount(Integer downloadcount) {
this.downloadcount = downloadcount;
}
/**
* @return String
*/
public String getDescription() {
return description;
}
/**
* @param String
*/
public void setDescription(String description) {
this.description = description;
}
/**
* @return String
*/
public String getType() {
return type;
}
/**
* @param String
*/
public void setType(String type) {
this.type = type;
}
/**
* @return String
*/
public String getPath() {
return path;
}
/**
* @param String
*/
public void setPath(String path) {
this.path = path;
}
/**
* @return String
*/
public String getFakepath() {
return fakepath;
}
/**
* @param String
*/
public void setFakepath(String fakepath) {
this.fakepath = fakepath;
}
/**
* @return String
*/
public String getIsauth() {
return isauth;
}
/**
* @param String
*/
public void setIsauth(String isauth) {
this.isauth = isauth;
}
/**
* @return String
*/
public String getIsdeleted() {
return isdeleted;
}
/**
* @param String
*/
public void setIsdeleted(String isdeleted) {
this.isdeleted = isdeleted;
}
/**
* @return String
*/
public String getUploadtime() {
return uploadtime;
}
/**
* @param String
*/
public void setUploadtime(String uploadtime) {
this.uploadtime = uploadtime;
}
/**
* @return String
*/
public String getRemark() {
return remark;
}
/**
* @param String
*/
public void setRemark(String remark) {
this.remark = remark;
}
/**
* @return String
*/
public String getTagname() {
return tagname;
}
/**
* @param String
*/
public void setTagname(String tagname) {
this.tagname = tagname;
}
}
package com.***.***.file.interfaces.dto;
import java.math.*;
import java.io.*;
import io.swagger.annotations.*;
import java.util.*;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.multipart.MultipartFile;
@ApiModel(description ="")
public class DownloadDto {
private static final long serialVersionUID = 1L;
@ApiModelProperty(value="", required=false)
private String filePath;
@ApiModelProperty(value="", required=false)
private String fileName;
@ApiModelProperty(value="", required=false)
private byte[] buffer;
@ApiModelProperty(value="", required=false)
private File file;
@ApiModelProperty(value="", required=false)
private Integer fis;
/**
* @return String
*/
public String getFilePath() {
return filePath;
}
/**
* @param String
*/
public void setFilePath(String filePath) {
this.filePath = filePath;
}
/**
* @return String
*/
public String getFileName() {
return fileName;
}
/**
* @param String
*/
public void setFileName(String fileName) {
this.fileName = fileName;
}
/**
* @return byte[]
*/
public byte[] getBuffer() {
return buffer;
}
/**
* @param byte[]
*/
public void setBuffer(byte[] buffer) {
this.buffer = buffer;
}
/**
* @return File
*/
public File getFile() {
return file;
}
/**
* @param File
*/
public void setFile(File file) {
this.file = file;
}
/**
* @return Integer
*/
public Integer getFis() {
return fis;
}
/**
* @param Integer
*/
public void setFis(Integer fis) {
this.fis = fis;
}
}