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java中使用restful web service来传输文件

Wesley13

2021-10-11

1398 1 0

【1】上传大文件：

1前端页面：  
2	1)同步上传：
3		<html>  
4			<body>  
5				<form action="http://localhost:8081/webProject/api/file/uploadFile" method="post" enctype="multipart/form-data">  
6				<input type="file" name="targetFile" />  
7				<input type="text" name="userName" value="jxn" />  
8				<input type="submit" value="提交" />  
9				</form>  
10			</body>  
11		</html>  
12  
13	2)异步上传：
14		<!DOCTYPE html>
15		<html>
16			<head>
17				<meta charset="UTF-8">
18				<title>异步上传文件</title>
19			</head>
20			<body>
21				<form id= "uploadForm" >  
22					  上传文件：	<input type="file" name="sendfile"/>
23									<input type="button" value="上传" onclick="doUpload()" />  
24				</form>  
25				
26				<script src="D:\soft\JQuery\jquery-1.7.2.min.js" type="text/javascript" charset="utf-8"></script>
27				<script type="text/javascript">
28					function doUpload() {  
29						 // var formData = new FormData($("#uploadForm")[0]);  
30						 var formData = new FormData()
31						 formData.append("targetFile",$("#sendfile"));
32						 formData.append("userName","test-username");
33						 $.ajax({  
34							  url: 'http://localhost:8081/webProject/api/file/uploadFile' ,  
35							  type: 'POST',  
36							  data: formData,  
37							  async: false,  
38							  cache: false,  
39							  contentType: false,  
40							  processData: false,  
41							  dataType:'json',
42							  success: function (data) {  
43								  alert(data);  
44							  }
45						 });  
46					}  
47				</script>
48			</body>
49		</html>
50	  
51	  
52后端：  
53  
54	web.xml  
55		<servlet>  
56			<servlet-name>CXFServlet</servlet-name>  
57			<servlet-class>org.apache.cxf.transport.servlet.CXFServlet</servlet-class>  
58			<load-on-startup>1 </load-on-startup>  
59		</servlet>  
60		<servlet-mapping>  
61			<servlet-name>CXFServlet</servlet-name>  
62			<url-pattern>/api/*</url-pattern>  
63		</servlet-mapping>  
64  
65	Spring配置文件：  
66		<jaxrs:server id="restFileService" address="/file">  
67			<jaxrs:providers>  
68				<bean class="org.codehaus.jackson.jaxrs.JacksonJsonProvider" />  
69			</jaxrs:providers>  
70			<jaxrs:serviceBeans>  
71				<ref bean="restFileServiceImpl" />  
72			</jaxrs:serviceBeans>  
73		</jaxrs:server>  
74		  
75		<bean id="restFileServiceImpl" class="xxx.api.fileprocess.REST.ApiFileProcessServiceImpl" />  
76		  
77		  
78	接口：  
79		import org.apache.cxf.jaxrs.ext.multipart.Attachment;  
80		import org.apache.cxf.jaxrs.ext.multipart.Multipart;  
81	  
82		@Path("")  
83		public interface ApiFileProcessService {  
84			[@POST](https://my.oschina.net/u/210428)  
85			@Path("/uploadFile")  
86			@Consumes(MediaType.MULTIPART_FORM_DATA)  
87			public String uploadFile(@Multipart(value="targetFile")Attachment targetFile, @Multipart(value="userName")String userName);  
88		}  
89	  
90	实现：  
91		import org.apache.cxf.jaxrs.ext.multipart.Attachment;  
92		import javax.activation.DataHandler;  
93	  
94		public class ApiFileProcessServiceImpl implements ApiFileProcessService {  
95			  
96			@Override  
97			public String uploadFile(Attachment targetFile, String userName) {  
98				  
99				try {  
100					DataHandler dataHandler = targetFile.getDataHandler();  
101					String originalFileName = new String(dataHandler.getName().getBytes("ISO8859-1"),"UTF-8");  
102					InputStream is = dataHandler.getInputStream();  
103					  
104					SimpleDateFormat df = new SimpleDateFormat("yyyyMMddHHmmss");  
105					String saveLocation = "D:\\" + df.format(new Date()) + "_" + originalFileName;  
106							  
107					OutputStream out = new FileOutputStream(new File(saveLocation));  
108					int read = 0;  
109					byte[] bytes = new byte[4096];  
110					while ((read = is.read(bytes)) != -1) {  
111						out.write(bytes, 0, read);  
112					}  
113					out.flush();  
114					out.close();  
115					  
116				} catch (Exception e) {  
117					e.printStackTrace();  
118				}  
119				  
120				return "success";  
121			}  
122		}  
123		  
124	测试结果：可以轻松处理(上传)1G以上的文件。

【2】上传小文件：

1前端页面： 
2	<html>
3	<body>
4		<form action="http://localhost:8081/webProject/api/file/uploadCommonFile" method="post" enctype="multipart/form-data">
5		<input type="file" name="file1" />
6		<input type="file" name="file2" />
7		<input type="submit" value="提交" />
8		</form>
9	</body>
10	</html>
11
12后端：  
13  
14	接口： 
15		import javax.ws.rs.core.Context;
16		
17		@Path("")  
18		public interface ApiFileProcessService {  
19			@POST
20			@Path("/uploadCommonFile")
21			@Consumes(MediaType.MULTIPART_FORM_DATA)
22			public String uploadCommonFile(@Context HttpServletRequest request);
23		}
24		
25	实现：
26		import org.apache.commons.fileupload.FileItem;
27		import org.apache.commons.fileupload.disk.DiskFileItemFactory;
28		import org.apache.commons.fileupload.servlet.ServletFileUpload;
29	  
30		public class ApiFileProcessServiceImpl implements ApiFileProcessService {  
31			@Override
32			public String uploadCommonFile(HttpServletRequest request) {
33
34				try {
35					DiskFileItemFactory factory = new DiskFileItemFactory();
36					ServletFileUpload fileUpload = new ServletFileUpload(factory);
37					List<FileItem> items = fileUpload.parseRequest(request);
38
39					for (FileItem item : items) {
40						if (!item.isFormField()) {
41							String originalFileName = item.getName();
42							
43							SimpleDateFormat df = new SimpleDateFormat("yyyyMMddHHmmss");  
44							String saveLocation = "D:\\" + df.format(new Date()) + "_" + originalFileName;  
45							
46							File picFile = new File(saveLocation);
47							item.write(picFile);
48						}
49					}
50				} catch (Exception e) {
51					e.printStackTrace();
52				}
53
54				return "success";
55			}
56		} 
57
58
59注意：此方法仅适合上传小文件。

【3】下载文件

1case1：
2	接口：	
3		import javax.ws.rs.GET;
4		import javax.ws.rs.QueryParam;
5
6		@Path("")  
7		public interface ApiFileProcessService {  
8			@GET
9			@Path("/downloadTemplate")
10			public Response downloadTemplate(@QueryParam("templateName")templateName );
11		}
12		
13	实现：
14		import javax.ws.rs.core.Response;
15		import javax.ws.rs.core.Response.ResponseBuilder;
16		
17		public class ApiFileProcessServiceImpl implements ApiFileProcessService {  
18		
19			@Override
20			public Response downloadTemplate(String templateName) {
21
22				File file = null;
23				String fileName = null;
24				
25				try {
26					String applicationPath = Thread.currentThread().getContextClassLoader().getResource("").toURI().getPath();
27
28					file = new File(applicationPath + "/" + templateName);
29
30					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
31					
32				} catch (Exception e) {
33					e.printStackTrace();
34					return Response.status(Response.Status.INTERNAL_SERVER_ERROR).entity(e.getMessage()).build();
35				}
36				
37				ResponseBuilder response = Response.ok((Object) file);
38				response.header("Content-Disposition", "attachment; filename=" + fileName);
39
40				return response.build();
41			}
42		}
43		
44		
45		
46case2：	
47	接口：
48		
49		import javax.ws.rs.*;
50		import javax.ws.rs.core.Context;
51		
52		@GET
53		@Path("/exportTest")
54		@Produces("application/vnd.ms-excel")
55		public Response exportTest(@FormParam("str") String str, @Context HttpServletResponse response);
56		
57	实现：
58		import javax.ws.rs.core.Response;
59		import javax.servlet.http.HttpServletResponse;
60	
61		@Override
62		public Response exportTest(String str, HttpServletResponse response) {
63
64			try {
65				ServletOutputStream outputStream = response.getOutputStream();
66
67				SXSSFWorkbook wb = new SXSSFWorkbook();
68				wb.setCompressTempFiles(true);
69
70				Sheet sheet = wb.createSheet("sheet0");
71				Row row = sheet.createRow(0);
72				row.createCell(0).setCellValue("hahaha");
73
74				wb.write(outputStream);
75
76				response.setHeader("content-disposition", "attachment;filename=" + URLEncoder.encode("中文名字.xlsx", "UTF-8"));
77				response.setContentType("application/vnd.ms-excel");
78				outputStream.close();
79
80			} catch (IOException e) {
81				e.printStackTrace();
82			}
83
84			return null;
85		}
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