JAVA httpclient 请求最佳实现

以下会依次列举常见的几种请求类型 : get , post param , post json , post file

GET

/*** get类型的* * @param url* @throws ClientProtocolException* @throws IOException*/
public static void testGet(String url) throws ClientProtocolException, IOException {// 设置超时时间，单位是秒RequestConfig defaultRequestConfig = RequestConfig.custom().setSocketTimeout(3000).setConnectTimeout(3000).setConnectionRequestTimeout(3000).build();CloseableHttpClient httpclient = HttpClients.createDefault();try {HttpGet httpget = new HttpGet(url);httpget.setConfig(defaultRequestConfig);ResponseHandler<String> responseHandler = new ResponseHandler<String>() {public String handleResponse(HttpResponse response) throws ClientProtocolException, IOException {int status = response.getStatusLine().getStatusCode();if (status >= 200 && status < 300) {HttpEntity entity = response.getEntity();return entity != null ? EntityUtils.toString(entity) : null;} else {throw new ClientProtocolException("Unexpected response status: " + status);}}};String responseBody = httpclient.execute(httpget, responseHandler);System.out.println(responseBody);} finally {httpclient.close();}
}

POST 参数

/*** form类型的，传参数* * @param url* @param map 参数* @throws ClientProtocolException* @throws IOException*/
public static void testPostParam(String url,Map<String,String> map) throws ClientProtocolException, IOException {// 设置超时时间RequestConfig defaultRequestConfig = RequestConfig.custom().setSocketTimeout(3000).setConnectTimeout(3000).setConnectionRequestTimeout(3000).build();CloseableHttpClient httpClient = HttpClients.custom().setDefaultRequestConfig(defaultRequestConfig).build();httpClient = HttpClients.createDefault();HttpPost post = new HttpPost("http://httpbin.org/post");post.setConfig(defaultRequestConfig);// 传参数List<BasicNameValuePair> list = new ArrayList<BasicNameValuePair>();for(Entry<String,string> entry: map.entrySet()){list.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));}HttpEntity ent = new UrlEncodedFormEntity(list, "UTF-8");post.setEntity(ent);ResponseHandler<String> responseHandler = new ResponseHandler<String>() {public String handleResponse(HttpResponse response) throws ClientProtocolException, IOException {int status = response.getStatusLine().getStatusCode();System.out.println(response.getEntity().toString());if (status >= 200 && status < 300) {HttpEntity entity = response.getEntity();return entity != null ? EntityUtils.toString(entity) : null;} else {throw new ClientProtocolException("Unexpected response status: " + status);}}};System.out.println(httpClient.execute(post, responseHandler));
}

POST JSON

/*** post json* * @param url 请求地址* @param jsonStr 请求json字符串* @throws ClientProtocolException* @throws IOException*/
public static void testPostJson(String url,String jsonStr) throws ClientProtocolException, IOException {// 设置超时时间RequestConfig defaultRequestConfig = RequestConfig.custom().setSocketTimeout(3000).setConnectTimeout(3000).setConnectionRequestTimeout(3000).build();CloseableHttpClient httpClient = HttpClients.custom().setDefaultRequestConfig(defaultRequestConfig).build();httpClient = HttpClients.createDefault();HttpPost post = new HttpPost(url);post.setConfig(defaultRequestConfig);// 传json字符串 "{\"key\":\"value\"}"StringEntity stringEntity = new StringEntity(jsonStr);stringEntity.setContentType("text/json");stringEntity.setContentEncoding(new BasicHeader(HTTP.CONTENT_TYPE, "application/json"));post.setEntity(stringEntity);ResponseHandler<String> responseHandler = new ResponseHandler<String>() {public String handleResponse(HttpResponse response) throws ClientProtocolException, IOException {int status = response.getStatusLine().getStatusCode();if (status >= 200 && status < 300) {HttpEntity entity = response.getEntity();return entity != null ? EntityUtils.toString(entity) : null;} else {throw new ClientProtocolException("Unexpected response status: " + status);}}};System.out.println(httpClient.execute(post, responseHandler));
}

POST FILE

/*** 上传文件* @param url 上传接口地址* @param filePath* @param fileName* @throws ClientProtocolException* @throws IOException*/
public static void testPostFile(String url,String filePath,string fileName) throws ClientProtocolException, IOException {RequestConfig defaultRequestConfig = RequestConfig.custom().setSocketTimeout(5000).setConnectTimeout(3000).setConnectionRequestTimeout(3000).build();CloseableHttpClient httpClient = HttpClients.custom().setDefaultRequestConfig(defaultRequestConfig).build();httpClient = HttpClients.createDefault();HttpPost post = new HttpPost(url);// 设置超时时间post.setConfig(defaultRequestConfig);// 传文件MultipartEntityBuilder builder = MultipartEntityBuilder.create();builder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);builder.addTextBody("name", "test");builder.addBinaryBody("file", new File(filePath), ContentType.DEFAULT_BINARY,fileName);post.setEntity(builder.build());ResponseHandler<String> responseHandler = new ResponseHandler<String>() {public String handleResponse(HttpResponse response) throws ClientProtocolException, IOException {int status = response.getStatusLine().getStatusCode();if (status >= 200 && status < 300) {HttpEntity entity = response.getEntity();return entity != null ? EntityUtils.toString(entity) : null;} else {throw new ClientProtocolException("Unexpected response status: " + status);}}};System.out.println(httpClient.execute(post, responseHandler));
}

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利用HttpClient4，实现get，post 参数，post json，post file

JAVA httpclient 请求最佳实现

GET

POST 参数

POST JSON

POST FILE

利用HttpClient4，实现get，post 参数，post json，post file相关推荐

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