java方式上傳文件

zhaizi:https://www.cnblogs.com/foxting/p/7895724.html

Java可以使用HttpClient發送Http請求、上傳文件等，非常的方便

Maven

 

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<dependency>     <groupId>org.apache.httpcomponents</groupId>     <artifactId>httpclient</artifactId>     <version>4.5.3</version> </dependency> <dependency>     <groupId>org.apache.httpcomponents</groupId>     <artifactId>httpmime</artifactId>     <version>4.5.3</version> </dependency>

上傳代碼1：

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public static void upload2() throws ClientProtocolException, IOException{     CloseableHttpClient httpClient = HttpClientBuilder.create().build();     CloseableHttpResponse httpResponse = null;     RequestConfig requestConfig = RequestConfig.custom().setConnectTimeout(200000).setSocketTimeout(200000000).build();     HttpPost httpPost = new HttpPost("http://localhost:8080/WEY.WebApp/auth/right/right/receiveFile.html");     httpPost.setConfig(requestConfig);     MultipartEntityBuilder multipartEntityBuilder = MultipartEntityBuilder.create();     //multipartEntityBuilder.setCharset(Charset.forName("UTF-8"));               //File file = new File("F:\\Ken\\1.PNG");     //FileBody bin = new FileBody(file);                File file = new File("F:\\Ken\\abc.pdf");                //multipartEntityBuilder.addBinaryBody("file", file,ContentType.create("image/png"),"abc.pdf");     //當設置了setSocketTimeout參數後，以下代碼上傳PDF不能成功，將setSocketTimeout參數去掉後此可以上傳成功。上傳圖片則沒有個限制     //multipartEntityBuilder.addBinaryBody("file",file,ContentType.create("application/octet-stream"),"abd.pdf");     multipartEntityBuilder.addBinaryBody("file",file);     //multipartEntityBuilder.addPart("comment", new StringBody("This is comment", ContentType.TEXT_PLAIN));     multipartEntityBuilder.addTextBody("comment", "this is comment");     HttpEntity httpEntity = multipartEntityBuilder.build();     httpPost.setEntity(httpEntity);               httpResponse = httpClient.execute(httpPost);     HttpEntity responseEntity = httpResponse.getEntity();     int statusCode= httpResponse.getStatusLine().getStatusCode();     if(statusCode == 200){         BufferedReader reader = new BufferedReader(new InputStreamReader(responseEntity.getContent()));         StringBuffer buffer = new StringBuffer();         String str = "";         while(!StringUtil.isRealEmpty(str = reader.readLine())) {             buffer.append(str);         }                       System.out.println(buffer.toString());     }               httpClient.close();     if(httpResponse!=null){         httpResponse.close();     }       }

上傳代碼2：

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public static void upload() {         CloseableHttpClient httpclient = HttpClients.createDefault();         //CloseableHttpClient httpclient = HttpClientBuilder.create().build();        try {             HttpPost httppost = new HttpPost("http://localhost:8080/WEY.WebApp/auth/right/right/receiveFile.html");                RequestConfig requestConfig = RequestConfig.custom().setConnectTimeout(200000).setSocketTimeout(200000).build();            httppost.setConfig(requestConfig);                         FileBody bin = new FileBody(new File("F:\\Ken\\abc.pdf"));             StringBody comment = new StringBody("This is comment", ContentType.TEXT_PLAIN);                HttpEntity reqEntity = MultipartEntityBuilder.create().addPart("file", bin).addPart("comment", comment).build();                httppost.setEntity(reqEntity);                System.out.println("executing request " + httppost.getRequestLine());             CloseableHttpResponse response = httpclient.execute(httppost);             try {                 System.out.println(response.getStatusLine());                 HttpEntity resEntity = response.getEntity();                 if (resEntity != null) {                     String responseEntityStr = EntityUtils.toString(response.getEntity());                    System.out.println(responseEntityStr);                    System.out.println("Response content length: " + resEntity.getContentLength());                 }                 EntityUtils.consume(resEntity);             } finally {                 response.close();             }         } catch (ClientProtocolException e) {             e.printStackTrace();         } catch (IOException e) {             e.printStackTrace();         } finally {             try {                 httpclient.close();             } catch (IOException e) {                 e.printStackTrace();             }         }     }

普通POST請求

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public String post() throws ClientProtocolException, IOException{     CloseableHttpClient httpClient = HttpClientBuilder.create().build();     CloseableHttpResponse httpResponse = null;     HttpPost httpPost = new HttpPost("http://localhost:8080/WEY.WebApp/auth/right/right/receivePost.html");     RequestConfig requestConfig = RequestConfig.custom().setConnectTimeout(20000).setSocketTimeout(22000).build();     httpPost.setConfig(requestConfig);     List<NameValuePair> params = new ArrayList<NameValuePair>();     params.add(new BasicNameValuePair("user.loginId", "Lin"));     params.add(new BasicNameValuePair("user.employeeName","令狐沖"));     UrlEncodedFormEntity entity = new UrlEncodedFormEntity(params,Charset.forName("UTF-8"));     httpPost.setEntity(entity);     httpResponse = httpClient.execute(httpPost);     HttpEntity responseEntity = httpResponse.getEntity();     if(responseEntity!=null){         String content = EntityUtils.toString(responseEntity,"UTF-8");         System.out.println(content);     }               if(httpResponse!=null){         httpResponse.close();     }     if(httpClient!=null){         httpClient.close();     }     return null; }