Java使用Commons-FileUpload组件实现文件上传最佳方案

import org.apache.commons.fileupload.FileItem;
 
import java.util.HashMap;
import java.util.Map;
 
public class ParamDto {
 
    private Map<String,String> paramMap;
    private Map<String,FileItem> fileMap;
 
    public ParamDto() {
        paramMap = new HashMap<>();
        fileMap = new HashMap<>();
    }
 
    public Map<String, String> getParamMap() {
        return paramMap;
    }
 
    public void setParamMap(Map<String, String> paramMap) {
        this.paramMap = paramMap;
    }
 
    public Map<String, FileItem> getFileMap() {
        return fileMap;
    }
 
    public void setFileMap(Map<String, FileItem> fileMap) {
        this.fileMap = fileMap;
    }
}

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.imooc.dto.ParamDto;
 
import javax.servlet.http.HttpServletRequest;
import java.io.File;
import java.util.List;
 
public class RequestUtil {
 
    /**
     * 从request流中解析参数与上传的文件
     * @param request
     */
    public static ParamDto parseParam(HttpServletRequest request) {
 
        ParamDto result = new ParamDto();
 
//创建一个FileItem工厂 通过DiskFileItemFactory对象创建文件上传核心组件
        ServletFileUpload upload = new ServletFileUpload(new DiskFileItemFactory());
        upload.setHeaderEncoding("UTF-8");
 
        try {
//通过文件上传核心组件解析request请求，获取到所有的FileItem对象
            List<FileItem> fileItemList = upload.parseRequest(request);
 
//遍历表单的所有表单项（FileItem） 并对其进行相关操作
            for(FileItem fileItem : fileItemList) {
//判断这个表单项如果是一个普通的表单项
                if(fileItem.isFormField()) {
                    result.getParamMap().put(fileItem.getFieldName(),fileItem.getString("UTF-8"));
//如果不是表单的普通文本域，就是
                } else {
                    result.getFileMap().put(fileItem.getFieldName(),fileItem);
                }
            }
        } catch (FileUploadException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result;
    }
}

import org.apache.commons.fileupload.FileItem;
 
import java.io.File;
 
public class FileUtil {
 
    /**
     * 上传文件的保存路径
     */
    public static final String SAVE_PATH = "d:/upload/";
 
    /**
     * 保存上传的文件
     * @param fileItem
     * @param path
     * @return
     * @throws Exception
     */
    public static String save(FileItem fileItem,String path) throws Exception {
        String fileName = System.currentTimeMillis() + "_" + fileItem.getName();
        fileItem.write(new File(path + fileName));
        return fileName;
    }
}