最近在学习文件上传部署的一些操作,以此记录做备忘之用.
一共两种方式:
1> 标准上传方式,可通过form表单action属性请求或者ajax方式进行请求,返回服务器上的存储路径.
2> 在前端将文件转换为Base64,然后将文件名和Base64字符串后端,经过解析之后,以输出流的方式写入到指定文件路径之中.
项目绝对路径基本可通过servletContext和类加载器.getPath的方式得到,不做赘述.
获取项目绝对路径:
//类加载器方式
ClassLoader classLoader = this.getClass().getClassLoader();
URL resource = classLoader.getResource(".");
String path = resource.getPath();
//通过ServletContext
ServletContext servletContext = request.getServletContext();
String realPath = servletContext.getRealPath("");
<!--文件上传导包-->
<!-- https://mvnrepository.com/artifact/commons-fileupload/commons-fileupload -->
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.3.1<ersion>
</dependency>
<!-- https://mvnrepository.com/artifact/commons-io/commons-io -->
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>2.5<ersion>
</dependency>
两种文件上传方式:
import com.alibaba.fastjson.JSON;
import com.sakura.Common.ResponseCode;
import com.sakura.Common.ServerResponse;
import com.sakura.Const.Const;
import com.sakura.Pojo.User;
import com.sakura.Utils.Random;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.springframework.stereotype.Service;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.*;
import java.util.ArrayList;
import java.util.Base64;
import java.util.List;
@Service
public class UploadFileService {
// 上传配置
private static final int MEMORY_THRESHOLD = 1024 * 1024 * 3; // 3MB
private static final int MAX_FILE_SIZE = 1024 * 1024 * 40; // 40MB
private static final int MAX_REQUEST_SIZE = 1024 * 1024 * 50; // 50MB
private ResponseCode data=new ResponseCode();
//基本文件上传
public ServerResponse loadFile(HttpSession session,
HttpServletRequest request, HttpServletResponse response) {
try {
request.setCharacterEncoding("UTF-8");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
response.setContentType("textml;charset=UTF-8");
// 检测是否为多媒体上传
if (!ServletFileUpload.isMultipartContent(request)) {
// 如果不是则停止
PrintWriter writer = null;
try {
writer = response.getWriter();
} catch (IOException e) {
e.printStackTrace();
}
writer.println("Error: 表单必须包含 enctype=multipart/form-data");
writer.flush();
return ServerResponse.DefaultResponse(Const.OPERATION_DEFAULE, Const.DEFAULT_FILE);
}
// 配置上传参数
DiskFileItemFactory factory = new DiskFileItemFactory();
// 设置内存临界值 - 超过后将产生临时文件并存储于临时目录中
factory.setSizeThreshold(MEMORY_THRESHOLD);
// 设置临时存储目录
factory.setRepository(new File(System.getProperty("java.io.tmpdir")));
ServletFileUpload upload = new ServletFileUpload(factory);
// 设置最大文件上传值
upload.setFileSizeMax(MAX_FILE_SIZE);
// 设置最大请求值 (包含文件和表单数据)
upload.setSizeMax(MAX_REQUEST_SIZE);
// 中文处理
upload.setHeaderEncoding("UTF-8");
// 构造临时路径来存储上传的文件
// 这个路径相对当前应用的目录
String UPLOAD_DIRECTORY = "upload";
//存储文件目录
ServletContext servletContext = request.getServletContext();
String realPath = servletContext.getRealPath("");
String uploadPath = realPath + File.separator + UPLOAD_DIRECTORY;
System.out.println("uploadPath:" + uploadPath);
// 如果目录不存在则创建
File uploadDir = new File(uploadPath);
if (!uploadDir.exists()) {
uploadDir.mkdir();
}
try {
// 解析请求的内容提取文件数据
@SuppressWarnings("unchecked")
List<FileItem> formItems = upload.parseRequest(request);
if (formItems != null && formItems.size() > 0) {
int size = formItems.size();
List<String> UrlList = new ArrayList();
// 迭代表单数据
for (FileItem item : formItems) { // 处理不在表单中的字段
if (!item.isFormField()) {
String fileName = new File(item.getName()).getName();
//时间 UUID随机串以避免重复
String uuid =Random.RandUUIDAndDate()+"_"+fileName;
String filePath = uploadPath + File.separator + uuid;
File storeFile = new File(filePath);
// 在控制台输出文件的上传路径
System.out.println("filePath:" + filePath);
// 保存文件到硬盘
item.write(storeFile);
UrlList.add(UPLOAD_DIRECTORY + "/" + uuid);
}
}
data.setMsg(JSON.toJSONString(UrlList));
data.setStatus(200);
}
} catch (Exception ex) {
String error = "错误信息: " + ex.getMessage();
data.setMsg(error);
data.setStatus(100);
}
return ServerResponse.SuccessResponse(data);
}
/**
* Base64方式存储文件 此法不通 需配置tomcat文件 同时Base64解码会出错,待研
* 究,不可用!
* @param name
* @param base64String
* @param session
* @param request
* @param response
* @return
*/
public ServerResponse loadFileBase64(String name, String base64String,
HttpSession session, HttpServletRequest request,
HttpServletResponse response) {
ServerResponse res=null;
String UPLOAD_DIRECTORY = "upload";
byte[] decode = Base64.getDecoder().decode(base64String);
//存储文件目录
ServletContext servletContext = request.getServletContext();
String realPath = servletContext.getRealPath("");
String uploadPath = realPath + File.separator + UPLOAD_DIRECTORY +
File.separator + Random.RandUUIDAndDate()
+"_"+name;
String path=File.separator + UPLOAD_DIRECTORY + File.separator
+Random.RandUUIDAndDate()+"_"+name;
File file = new File(uploadPath);
FileOutputStream fileOutputStream =null;
BufferedOutputStream bufferedOutputStream =null;
try {
fileOutputStream = new FileOutputStream(file);
bufferedOutputStream = new BufferedOutputStream(fileOutputStream);
bufferedOutputStream.write(decode);
bufferedOutputStream.flush();
res.setMsg("上传成功");
res.setStatus(200);
res.setData(path);
} catch (IOException e) {
res.setMsg("上传失败");
res.setStatus(100);
path=null;
} finally {
if (bufferedOutputStream != null) {
try {
bufferedOutputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (fileOutputStream != null) {
try {
fileOutputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return res;
}
}
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