REST中上传文件简单的实现笔记

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package boa.framework.updown;import java.io.File;import java.nio.file.Paths;import java.util.List;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.ws.rs.Consumes;import javax.ws.rs.POST;import javax.ws.rs.Path;import javax.ws.rs.core.Context;import javax.ws.rs.core.Response;import org.apache.commons.fileupload.FileItem;import org.apache.commons.fileupload.disk.DiskFileItemFactory;import org.apache.commons.fileupload.servlet.ServletFileUpload;/** *  * REST,非spring版本。 * @author zhangdapeng * @version 1.0,2014-1-03 13:05:06 * @since   1.0 */@Path("/file")public class Upload {@ContextHttpServletRequest request;@ContextHttpServletResponse response;@POST@Path("/upload")@Consumes("multipart/form-data")public Response upLoad() throws Exception {String upload_file_path=request.getSession().getServletContext().getRealPath("/")+"upload/" ;System.out.println(upload_file_path);// 设置工厂DiskFileItemFactory factory = new DiskFileItemFactory();// 设置文件存储位置factory.setRepository(Paths.get(upload_file_path).toFile());// 设置大小，如果文件小于设置大小的话，放入内存中，如果大于的话则放入磁盘中,单位是bytefactory.setSizeThreshold(1024 * 1024);ServletFileUpload upload = new ServletFileUpload(factory);// 这里就是中文文件名处理的代码，其实只有一行upload.setHeaderEncoding("utf-8");String fileName = null;List<FileItem> list = upload.parseRequest(request);for (FileItem item : list) {if (item.isFormField()) {String name = item.getFieldName();String value = item.getString("utf-8");System.out.println(name);System.out.println(value);request.setAttribute(name, value);} else {String name = item.getFieldName();String value = item.getName();System.out.println(name);System.out.println(value);fileName = Paths.get(value).getFileName().toString();request.setAttribute(name, fileName);if(!Paths.get(upload_file_path).toFile().exists()){Paths.get(upload_file_path).toFile().mkdirs();}// 写文件到path目录，文件名问filenameitem.write(new File(upload_file_path, fileName));}}return Response.status(200).entity("uploadFile is called, Uploaded file name : " + fileName).build();}}
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