【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

public static final String ImgPath = "D:/Imgaes/";
@Path("/uploadimg")
    @POST
    @Produces(MediaType.APPLICATION_JSON)
    @Consumes(MediaType.MULTIPART_FORM_DATA)
    public String uploadImg(@FormDataParam("file") InputStream fileInputStream,
                            @FormDataParam("file") FormDataContentDisposition dataContentDisposition,
                            @Context HttpServletRequest request) {
        String imgName = Calendar.getInstance().getTimeInMillis() + dataContentDisposition.getFileName();
        File file = new File(ImgPath + imgName);
        try {
            FileUtils.copyInputStreamToFile(fileInputStream, file);
        } catch (IOException e) {

            e.printStackTrace();
        }
        JsonBuilder resultJson = new JsonBuilder();
        resultJson.append("ret", request.getScheme() + "://" + request.getServerName() + ":"
                + request.getServerPort() + "/app/images/" + imgName);
        return resultJson.toString();
    }

    @Path("/images/{name}.{type}")
    @GET
    public void showImg(@PathParam("name") String imageName,
                        @PathParam("type") String type,
                        @Context HttpServletResponse response)
            throws IOException {
        InputStream inputStream = null;
        OutputStream out = null;
        try {
            File file = new File(ImgPath + imageName + "." + type);
            inputStream = new FileInputStream(file);
            out = response.getOutputStream();
            // pic size = 1M
            byte[] bytes = new byte[1024 * 1024];
            int len = 0;
            while ((len = inputStream.read(bytes)) > 0) {
                out.write(bytes, 0, len);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (inputStream != null)
                inputStream.close();
            if (out != null)
                out.close();
        }
    }