【Jersey】图片上传及显示

一、前期准备

图片上传需要用到的一些依赖：

<dependency>
      <groupId>org.jvnet.mimepull</groupId>
      <artifactId>mimepull</artifactId>
      <version>1.7</version>
</dependency>
<dependency>
       <groupId>com.sun.jersey.contribs</groupId>
       <artifactId>jersey-multipart</artifactId>
       <version>${jersey.version}</version>
</dependency>

二、Jersey注解

@Path("/img")

表示访问路径为/img，并且可以接收参数，例如@Path("/images/{name}.{type}")，再利用@PathParam来接收name和type两个参数；同时也支持正则表达式，例如@Path("username/{username:[a-zA-Z][0-9]*}")

@POST

代表接受的HTTP请求类型为POST

@Consumes(MediaType.MULTIPART_FORM_DATA)

表示接受的数据类型为"multipart/form-data"

@Produces(MediaType.APPLICATION_JSON)

表示发生出去的数据类型为"application/json"

@FormDataParam

接收图片、文件等特定类型数据

@Context

接收POST请求中发送的参数

@QueryParam

获取GET请求中url中的参数，例如请求url为http://localhost:8080/user?username=Amy&age=12&gender=male，那么可以使用：

@Path("/user")
@GET
public addUser(@QueryParam("username") String username,
               @QueryParam("age") int age,
               @QueryParam("gender") String gender) {
    //.....
}                        

来接收这三个参数。

@PathParam

获取URL路径参数

三、代码

 1 public static final String ImgPath = "D:/Imgaes/";
 2 @Path("/uploadimg")
 3     @POST
 4     @Produces(MediaType.APPLICATION_JSON)
 5     @Consumes(MediaType.MULTIPART_FORM_DATA)
 6     public String uploadImg(@FormDataParam("file") InputStream fileInputStream,
 7                             @FormDataParam("file") FormDataContentDisposition dataContentDisposition,
 8                             @Context HttpServletRequest request) {
 9         String imgName = Calendar.getInstance().getTimeInMillis() + dataContentDisposition.getFileName();
10         File file = new File(ImgPath + imgName);
11         try {
12             FileUtils.copyInputStreamToFile(fileInputStream, file);
13         } catch (IOException e) {
14
15             e.printStackTrace();
16         }
17         JsonBuilder resultJson = new JsonBuilder();
18         resultJson.append("ret", request.getScheme() + "://" + request.getServerName() + ":"
19                 + request.getServerPort() + "/app/images/" + imgName);
20         return resultJson.toString();
21     }
22
23     @Path("/images/{name}.{type}")
24     @GET
25     public void showImg(@PathParam("name") String imageName,
26                         @PathParam("type") String type,
27                         @Context HttpServletResponse response)
28             throws IOException {
29         InputStream inputStream = null;
30         OutputStream out = null;
31         try {
32             File file = new File(ImgPath + imageName + "." + type);
33             inputStream = new FileInputStream(file);
34             out = response.getOutputStream();
35             // pic size = 1M
36             byte[] bytes = new byte[1024 * 1024];
37             int len = 0;
38             while ((len = inputStream.read(bytes)) > 0) {
39                 out.write(bytes, 0, len);
40             }
41         } catch (Exception e) {
42             e.printStackTrace();
43         } finally {
44             if (inputStream != null)
45                 inputStream.close();
46             if (out != null)
47                 out.close();
48         }
49     }