httpclient常用方法封装

项目依赖

    <dependencies>        <dependency>            <groupId>junit</groupId>            <artifactId>junit</artifactId>            <version>4.12</version>            <scope>test</scope>        </dependency>        <dependency>            <groupId>org.apache.httpcomponents</groupId>            <artifactId>httpclient</artifactId>            <version>4.5.2</version>        </dependency>        <dependency>            <groupId>org.apache.httpcomponents</groupId>            <artifactId>httpmime</artifactId>            <version>4.5.2</version>        </dependency>        <dependency>            <groupId>org.apache.httpcomponents</groupId>            <artifactId>httpasyncclient</artifactId>            <version>4.1.3</version>        </dependency>        <dependency>            <groupId>com.alibaba</groupId>            <artifactId>fastjson</artifactId>            <version>1.2.35</version>        </dependency>        <dependency>            <groupId>commons-io</groupId>            <artifactId>commons-io</artifactId>            <version>2.5</version>        </dependency>        <dependency>            <groupId>org.apache.commons</groupId>            <artifactId>commons-lang3</artifactId>            <version>3.6</version>        </dependency>    </dependencies>

模拟get请求

    public static String get(String url, Map<String, String> params) {        String respString = "";        CloseableHttpClient httpclient = HttpClients.createDefault();        HttpGet httpget = new HttpGet(url);        try {            CloseableHttpResponse response = httpclient.execute(httpget);            HttpEntity httpEntity = response.getEntity();            respString = EntityUtils.toString(httpEntity);        } catch (IOException e) {            e.printStackTrace();        } finally {            try {                httpclient.close();            } catch (IOException e) {            }        }        return respString;    }

模拟post请求

    public static String postForm(String url, Map<String, String> form) {        String respString = "";        List<NameValuePair> formParams = new ArrayList<>();        Set<Map.Entry<String, String>> entries = form.entrySet();        Iterator<Map.Entry<String, String>> it = entries.iterator();        while (it.hasNext()) {            Map.Entry<String, String> next = it.next();            String key = next.getKey();            String value = next.getValue();            formParams.add(new BasicNameValuePair(key, value));        }        CloseableHttpClient httpclient = HttpClients.createDefault();        try {            HttpEntity entity = new UrlEncodedFormEntity(formParams, "UTF-8");            HttpPost request = new HttpPost(url);            request.setEntity(entity);            CloseableHttpResponse response = httpclient.execute(request);            request.abort();//释放post请求            if (response.getStatusLine().getStatusCode() == 302) {                String locationUrl = response.getLastHeader("Location").getValue();                respString = get(locationUrl, null);//跳转到重定向的url            } else if (response.getStatusLine().getStatusCode() == 200) {                HttpEntity httpEntity = response.getEntity();                respString = EntityUtils.toString(httpEntity);            }        } catch (UnsupportedEncodingException e) {            e.printStackTrace();        } catch (ClientProtocolException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        } finally {            try {                httpclient.close();            } catch (IOException e) {            }        }        return respString;    }

模拟getJson请求

    public static String get(String url, Map<String, String> params) {        String respString = "";        CloseableHttpClient httpclient = HttpClients.createDefault();        HttpGet httpget = new HttpGet(url);        try {            CloseableHttpResponse response = httpclient.execute(httpget);            HttpEntity httpEntity = response.getEntity();            respString = EntityUtils.toString(httpEntity);        } catch (IOException e) {            e.printStackTrace();        } finally {            try {                httpclient.close();            } catch (IOException e) {            }        }        return respString;    }

模拟postJson请求

    public static String postJson(String url, String json) {        String resultJson = "";        CloseableHttpClient httpclient = HttpClients.createDefault();        HttpPost httppost = new HttpPost(url);        CloseableHttpResponse response = null;        try {            StringEntity entity = new StringEntity(json, "UTF-8");            entity.setContentEncoding("UTF-8");            entity.setContentType("UTF-8");            httppost.setEntity(entity);            response = httpclient.execute(httppost);            HttpEntity result = response.getEntity();            resultJson = EntityUtils.toString(result, "UTF-8");        } catch (Exception e) {            e.printStackTrace();        } finally {            if (response != null) {                try {                    response.close();                } catch (IOException e) {                }            }        }        return resultJson;    }

模拟异步postJson请求

    public static String postJsonAsync(String url, String json, Integer timeOut, Class<? extends FutureCallback<HttpResponse>> clazz) {        if (timeOut == null || timeOut < 0) {            timeOut = 5000;        }        String resultJson = "";        // 创建默认的httpClient实例.        final CloseableHttpAsyncClient httpclient = HttpAsyncClients.createDefault();        // 创建httppost        httpclient.start();        FutureCallback<HttpResponse> futureCallback = null;        try {            Constructor<? extends FutureCallback<HttpResponse>> declaredConstructor = clazz.getDeclaredConstructor(CloseableHttpAsyncClient.class);            futureCallback = declaredConstructor.newInstance(httpclient);        } catch (NoSuchMethodException e) {        } catch (SecurityException e) {            e.printStackTrace();        } catch (InstantiationException e) {            e.printStackTrace();        } catch (IllegalAccessException e) {            e.printStackTrace();        } catch (IllegalArgumentException e) {            e.printStackTrace();        } catch (InvocationTargetException e) {            e.printStackTrace();        }        final HttpPost httppost = new HttpPost(url);        RequestConfig requestConfig = RequestConfig.custom().setSocketTimeout(timeOut).setConnectTimeout(2000).build();// 设置请求和传输超时时间        httppost.setConfig(requestConfig);        try {            StringEntity entity = new StringEntity(json, "UTF-8");            entity.setContentEncoding("UTF-8");            entity.setContentType("application/json");            httppost.setEntity(entity);            httpclient.execute(httppost, futureCallback);        } catch (Exception e) {            e.printStackTrace();        } finally {            try {                httpclient.close();            } catch (IOException e) {                e.printStackTrace();            }        }        return resultJson;    }

模拟使用异步postJson

    public static void main(String[] args) {        postJsonAsync("url", "{'a':1}", 50, CallBack.class);    }    static class CallBack implements FutureCallback<HttpResponse> {        private CloseableHttpAsyncClient httpclient;        public CallBack(CloseableHttpAsyncClient httpclient) {            this.httpclient = httpclient;        }        @Override        public void completed(HttpResponse response) {            HttpEntity result = response.getEntity();            try {                String resultJson = EntityUtils.toString(result, "UTF-8");                System.out.println(resultJson);            } catch (IOException e) {                e.printStackTrace();            }        }        @Override        public void failed(Exception ex) {        }        @Override        public void cancelled() {        }    }