java中使用restful web service来传输文件

【1】上传大文件：

前端页面：  
	1)同步上传：
		<html>  
			<body>  
				<form action="http://localhost:8081/webProject/api/file/uploadFile" method="post" enctype="multipart/form-data">  
				<input type="file" name="targetFile" />  
				<input type="text" name="userName" value="jxn" />  
				<input type="submit" value="提交" />  
				</form>  
			</body>  
		</html>  
  
	2)异步上传：
		<!DOCTYPE html>
		<html>
			<head>
				<meta charset="UTF-8">
				<title>异步上传文件</title>
			</head>
			<body>
				<form id= "uploadForm" >  
					  上传文件：	<input type="file" name="sendfile"/>
									<input type="button" value="上传" onclick="doUpload()" />  
				</form>  
				
				<script src="D:\soft\JQuery\jquery-1.7.2.min.js" type="text/javascript" charset="utf-8"></script>
				<script type="text/javascript">
					function doUpload() {  
						 // var formData = new FormData($("#uploadForm")[0]);  
						 var formData = new FormData()
						 formData.append("targetFile",$("#sendfile"));
						 formData.append("userName","test-username");
						 $.ajax({  
							  url: 'http://localhost:8081/webProject/api/file/uploadFile' ,  
							  type: 'POST',  
							  data: formData,  
							  async: false,  
							  cache: false,  
							  contentType: false,  
							  processData: false,  
							  dataType:'json',
							  success: function (data) {  
								  alert(data);  
							  }
						 });  
					}  
				</script>
			</body>
		</html>
	  
	  
后端：  
  
	web.xml  
		<servlet>  
			<servlet-name>CXFServlet</servlet-name>  
			<servlet-class>org.apache.cxf.transport.servlet.CXFServlet</servlet-class>  
			<load-on-startup>1 </load-on-startup>  
		</servlet>  
		<servlet-mapping>  
			<servlet-name>CXFServlet</servlet-name>  
			<url-pattern>/api/*</url-pattern>  
		</servlet-mapping>  
  
	Spring配置文件：  
		<jaxrs:server id="restFileService" address="/file">  
			<jaxrs:providers>  
				<bean class="org.codehaus.jackson.jaxrs.JacksonJsonProvider" />  
			</jaxrs:providers>  
			<jaxrs:serviceBeans>  
				<ref bean="restFileServiceImpl" />  
			</jaxrs:serviceBeans>  
		</jaxrs:server>  
		  
		<bean id="restFileServiceImpl" class="xxx.api.fileprocess.REST.ApiFileProcessServiceImpl" />  
		  
		  
	接口：  
		import org.apache.cxf.jaxrs.ext.multipart.Attachment;  
		import org.apache.cxf.jaxrs.ext.multipart.Multipart;  
	  
		@Path("")  
		public interface ApiFileProcessService {  
			[@POST](https://my.oschina.net/u/210428)  
			@Path("/uploadFile")  
			@Consumes(MediaType.MULTIPART_FORM_DATA)  
			public String uploadFile(@Multipart(value="targetFile")Attachment targetFile, @Multipart(value="userName")String userName);  
		}  
	  
	实现：  
		import org.apache.cxf.jaxrs.ext.multipart.Attachment;  
		import javax.activation.DataHandler;  
	  
		public class ApiFileProcessServiceImpl implements ApiFileProcessService {  
			  
			@Override  
			public String uploadFile(Attachment targetFile, String userName) {  
				  
				try {  
					DataHandler dataHandler = targetFile.getDataHandler();  
					String originalFileName = new String(dataHandler.getName().getBytes("ISO8859-1"),"UTF-8");  
					InputStream is = dataHandler.getInputStream();  
					  
					SimpleDateFormat df = new SimpleDateFormat("yyyyMMddHHmmss");  
					String saveLocation = "D:\\" + df.format(new Date()) + "_" + originalFileName;  
							  
					OutputStream out = new FileOutputStream(new File(saveLocation));  
					int read = 0;  
					byte[] bytes = new byte[4096];  
					while ((read = is.read(bytes)) != -1) {  
						out.write(bytes, 0, read);  
					}  
					out.flush();  
					out.close();  
					  
				} catch (Exception e) {  
					e.printStackTrace();  
				}  
				  
				return "success";  
			}  
		}  
		  
	测试结果：可以轻松处理(上传)1G以上的文件。

【2】上传小文件：

前端页面： 
	<html>
	<body>
		<form action="http://localhost:8081/webProject/api/file/uploadCommonFile" method="post" enctype="multipart/form-data">
		<input type="file" name="file1" />
		<input type="file" name="file2" />
		<input type="submit" value="提交" />
		</form>
	</body>
	</html>

后端：  
  
	接口： 
		import javax.ws.rs.core.Context;
		
		@Path("")  
		public interface ApiFileProcessService {  
			@POST
			@Path("/uploadCommonFile")
			@Consumes(MediaType.MULTIPART_FORM_DATA)
			public String uploadCommonFile(@Context HttpServletRequest request);
		}
		
	实现：
		import org.apache.commons.fileupload.FileItem;
		import org.apache.commons.fileupload.disk.DiskFileItemFactory;
		import org.apache.commons.fileupload.servlet.ServletFileUpload;
	  
		public class ApiFileProcessServiceImpl implements ApiFileProcessService {  
			@Override
			public String uploadCommonFile(HttpServletRequest request) {

				try {
					DiskFileItemFactory factory = new DiskFileItemFactory();
					ServletFileUpload fileUpload = new ServletFileUpload(factory);
					List<FileItem> items = fileUpload.parseRequest(request);

					for (FileItem item : items) {
						if (!item.isFormField()) {
							String originalFileName = item.getName();
							
							SimpleDateFormat df = new SimpleDateFormat("yyyyMMddHHmmss");  
							String saveLocation = "D:\\" + df.format(new Date()) + "_" + originalFileName;  
							
							File picFile = new File(saveLocation);
							item.write(picFile);
						}
					}
				} catch (Exception e) {
					e.printStackTrace();
				}

				return "success";
			}
		} 


注意：此方法仅适合上传小文件。

【3】下载文件

case1：
	接口：	
		import javax.ws.rs.GET;
		import javax.ws.rs.QueryParam;

		@Path("")  
		public interface ApiFileProcessService {  
			@GET
			@Path("/downloadTemplate")
			public Response downloadTemplate(@QueryParam("templateName")templateName );
		}
		
	实现：
		import javax.ws.rs.core.Response;
		import javax.ws.rs.core.Response.ResponseBuilder;
		
		public class ApiFileProcessServiceImpl implements ApiFileProcessService {  
		
			@Override
			public Response downloadTemplate(String templateName) {

				File file = null;
				String fileName = null;
				
				try {
					String applicationPath = Thread.currentThread().getContextClassLoader().getResource("").toURI().getPath();

					file = new File(applicationPath + "/" + templateName);

					fileName = URLEncoder.encode(templateName, "UTF-8"); // 如果不进行编码，则下载下来的文件名称是乱码
					
				} catch (Exception e) {
					e.printStackTrace();
					return Response.status(Response.Status.INTERNAL_SERVER_ERROR).entity(e.getMessage()).build();
				}
				
				ResponseBuilder response = Response.ok((Object) file);
				response.header("Content-Disposition", "attachment; filename=" + fileName);

				return response.build();
			}
		}
		
		
		
case2：	
	接口：
		
		import javax.ws.rs.*;
		import javax.ws.rs.core.Context;
		
		@GET
		@Path("/exportTest")
		@Produces("application/vnd.ms-excel")
		public Response exportTest(@FormParam("str") String str, @Context HttpServletResponse response);
		
	实现：
		import javax.ws.rs.core.Response;
		import javax.servlet.http.HttpServletResponse;
	
		@Override
		public Response exportTest(String str, HttpServletResponse response) {

			try {
				ServletOutputStream outputStream = response.getOutputStream();

				SXSSFWorkbook wb = new SXSSFWorkbook();
				wb.setCompressTempFiles(true);

				Sheet sheet = wb.createSheet("sheet0");
				Row row = sheet.createRow(0);
				row.createCell(0).setCellValue("hahaha");

				wb.write(outputStream);

				response.setHeader("content-disposition", "attachment;filename=" + URLEncoder.encode("中文名字.xlsx", "UTF-8"));
				response.setContentType("application/vnd.ms-excel");
				outputStream.close();

			} catch (IOException e) {
				e.printStackTrace();
			}

			return null;
		}

java中使用restful web service来传输文件

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