Java可以使用HttpClient发送Http请求、上传文件等，非常的方便
Maven
<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>
上传代码1：
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");
//当设置了setSocketTimeout参数后，以下代码上传PDF不能成功，将setSocketTimeout参数去掉后此可以上传成功。上传图片则没有个限制
//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();
}
}
上传代码2：
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请求
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","令狐冲"));
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;
}