利用 HttpClient 上傳文件

文件上傳用的是Apache HttpClient 4.3。

    /**


 * Example how to use multipart/form encoded POST request. 
 */  
public class ClientMultipartFormPost {  

    public static void main(String[] args) throws Exception {  
        if (args.length != 1)  {  
            System.out.println("File path not given");  
            System.exit(1);  
        }  
        CloseableHttpClient httpclient = HttpClients.createDefault();  
        try {  
            HttpPost httppost = new HttpPost("http://localhost:8080" +  
                    "/servlets-examples/servlet/RequestInfoExample");  

            FileBody img = new FileBody(new File(args[0]));  
            StringBody filename = new StringBody("A binary file of some kind", ContentType.TEXT_PLAIN);  
            StringBody comment = new StringBody("A binary file of some kind", ContentType.TEXT_PLAIN);  

            HttpEntity reqEntity = MultipartEntityBuilder.create()  
                    .addPart("img", img)  
                    .addPart("filename", filename)  
                    .addPart("comment", comment)  
                    .build();  


            httppost.setEntity(reqEntity);  

            System.out.println("executing request " + httppost.getRequestLine());  
            CloseableHttpResponse response = httpclient.execute(httppost);  
            try {  
                System.out.println("----------------------------------------");  
                System.out.println(response.getStatusLine());  
                HttpEntity resEntity = response.getEntity();  
                if (resEntity != null) {  
                    System.out.println("Response content length: " + resEntity.getContentLength());  
                }  
                EntityUtils.consume(resEntity);  
            } finally {  
                response.close();  
            }  
        } finally {  
            httpclient.close();  
        }  
    }  

}  </pre></span>