RESTful JAX-RS文件上传示例

就像上一页中的下载一样, 我们可以轻松上传文件, 例如图像文件, pdf文件, excel文件, 文本文件等。

@FormDataParam（“ file”）批注用于在服务类中提及文件参数。 @Consumes（MediaType.MULTIPART_FORM_DATA）用于提供文件上传的信息。

要使用JAX-RS API上传文件, 我们正在使用jersey实现。

单击我下载jersey jar文件。

要通过jersey实施上传文件, 你需要在web.xml文件中提供额外的配置条目。

<init-param>
    <param-name>jersey.config.server.provider.classnames</param-name>
    <param-value>org.glassfish.jersey.filter.LoggingFilter;
     org.glassfish.jersey.media.multipart.MultiPartFeature</param-value>
</init-param>

让我们看一下使用RESTful JAX-RS API上传文件的完整代码。

JAX-RS文件上传

档案：FileUploadService.java

package com.srcmini.rest;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import javax.ws.rs.Consumes;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import org.glassfish.jersey.media.multipart.FormDataContentDisposition;
import org.glassfish.jersey.media.multipart.FormDataParam;
@Path("/files")
public class FileUploadService {
 	@POST
	@Path("/upload")
	@Consumes(MediaType.MULTIPART_FORM_DATA)
 	public Response uploadFile(
 			@FormDataParam("file") InputStream uploadedInputStream, @FormDataParam("file") FormDataContentDisposition fileDetail) {
  			String fileLocation = "e://" + fileDetail.getFileName();
 	                //saving file
 			try {
 				FileOutputStream out = new FileOutputStream(new File(fileLocation));
 				int read = 0;
 				byte[] bytes = new byte[1024];
 				out = new FileOutputStream(new File(fileLocation));
 				while ((read = uploadedInputStream.read(bytes)) != -1) {
 					out.write(bytes, 0, read);
 				}
 				out.flush();
 				out.close();
 			} catch (IOException e) {e.printStackTrace();}
 			String output = "File successfully uploaded to : " + fileLocation;
  			return Response.status(200).entity(output).build();
  		}
  }

文件：web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
 <servlet>
    <servlet-name>Jersey REST Service</servlet-name>
    <servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>
     <init-param>
        <param-name>jersey.config.server.provider.packages</param-name>
        <param-value>com.srcmini.rest</param-value>
    </init-param>
    <init-param>
    <param-name>jersey.config.server.provider.classnames</param-name>
    <param-value>org.glassfish.jersey.filter.LoggingFilter;
     org.glassfish.jersey.media.multipart.MultiPartFeature</param-value>
</init-param>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>Jersey REST Service</servlet-name>
    <url-pattern>/rest/*</url-pattern>
  </servlet-mapping>
</web-app>

档案：index.html

<h2>File Upload Example</h2>
<form action="rest/files/upload" method="post" enctype="multipart/form-data">
	   <p>
		Select a file : <input type="file" name="file" size="45" />
	   </p>
	   <input type="submit" value="Upload File" />
</form>

现在, 在服务器上运行此应用程序, 你将看到以下输出：

输出：

File successfully uploaded to e://myimage.png

单击我下载此示例