httpClient连接工具类实测可用

package com.jeecms.common.util;

import com.google.gson.Gson;
import com.jeecms.cms.api.Constants;
import lombok.extern.slf4j.Slf4j;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpRequestBase;
import org.apache.http.conn.ClientConnectionManager;
import org.apache.http.conn.scheme.Scheme;
import org.apache.http.conn.scheme.SchemeRegistry;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.StringEntity;
import org.apache.http.entity.mime.HttpMultipartMode;
import org.apache.http.entity.mime.MultipartEntityBuilder;
import org.apache.http.entity.mime.content.FileBody;
import org.apache.http.entity.mime.content.StringBody;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicHeader;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.params.CoreConnectionPNames;
import org.apache.http.params.HttpParams;
import org.apache.http.util.EntityUtils;
import org.apache.http.conn.ssl.SSLSocketFactory;
import sun.java2d.opengl.OGLContext;

import javax.annotation.Resource;
import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;
import java.io.*;
import java.net.URI;
import java.nio.charset.Charset;
import java.util.*;
import java.util.Map.Entry;
/**
 * @ Author     ：YanTingXiang
 * @ Date       ：Created in 2019-06-10
 * @ Description：
 * @Version : 1.0
 */
@Slf4j
public class HttpClientUtil {
    @Resource
    private Gson gson;

    private static HttpClientUtil instance;
    protected Charset charset;
    private int timeOut=10000;//10s download not set timeout


    public static DefaultHttpClient getHttpsClient() {
        try {
            SSLContext ctx = SSLContext.getInstance("TLS");
            X509TrustManager tm = new X509TrustManager() {

                public void checkClientTrusted(
                        java.security.cert.X509Certificate[] chain,
                        String authType)
                        throws java.security.cert.CertificateException {
                }

                public void checkServerTrusted(
                        java.security.cert.X509Certificate[] chain,
                        String authType)
                        throws java.security.cert.CertificateException {
                }

                public java.security.cert.X509Certificate[] getAcceptedIssuers() {
                    return null;
                }

            };
            DefaultHttpClient client = new DefaultHttpClient();
            ctx.init(null, new TrustManager[] { tm }, null);
            SSLSocketFactory ssf = new SSLSocketFactory(ctx);

            ClientConnectionManager ccm = client.getConnectionManager();
            SchemeRegistry sr = ccm.getSchemeRegistry();
            // 设置要使用的端口，默认是443
            sr.register(new Scheme("https", 443, ssf));
            return client;
        } catch (Exception ex) {
            return null;
        }
    }

    private HttpClientUtil(){}

    public static HttpClientUtil getInstance() {
        return getInstance(Charset.defaultCharset());
    }

    public static HttpClientUtil getInstance(Charset charset){
        if(instance == null){
            instance = new HttpClientUtil();
        }
        instance.setCharset(charset);
        return instance;
    }

    public void setCharset(Charset charset) {
        this.charset = charset;
    }

    /**
     * post请求
     */
    public String doPost(String url) throws Exception {
        return doPost(url, null, null);
    }
    public String doPostByHeader(String url,Map<String, String> header) throws Exception {
        return doPost(url, null, header);
    }
    public String doPost(String url, Map<String, Object> params) throws Exception {
        return doPost(url, params, null);
    }

    public String doPost(String url, Map<String, Object> params, Map<String, String> header) throws Exception {
        String body = null;
        try {
            // Post请求
            log.debug(" protocol: POST");
            log.debug("      url: " + url);
            HttpPost httpPost = new HttpPost(url.trim());
            RequestConfig requestConfig = RequestConfig.custom().setConnectionRequestTimeout(timeOut) .setConnectTimeout(timeOut).setSocketTimeout(timeOut).build();
            httpPost.setConfig(requestConfig);
            // 设置参数
            if (null != params && !header.isEmpty()){
                log.debug("   params: " + gson.toJson(params));
                httpPost.setEntity(new UrlEncodedFormEntity(map2NameValuePairList(params), charset));
            }
            // 设置Header
            if (header != null && !header.isEmpty()) {
                log.debug("   header: " + header.get(Constants.HEADER_KEY_TOKEN));
                for (Iterator<Map.Entry<String, String>> it = header.entrySet().iterator(); it.hasNext();) {
                    Map.Entry<String, String> entry = (Entry<String, String>) it.next();
                    httpPost.setHeader(new BasicHeader(entry.getKey(), entry.getValue()));
                }
            }
            // 发送请求,获取返回数据
            body = execute(httpPost);
        } catch (Exception e) {
            throw e;
        }
        log.debug("   result: " + body);
        return body;
    }

    /**
     * postJson请求
     */
    public String doPostJson(String url, Map<String, Object> params) throws Exception {
        return doPostJson(url, params, null);
    }

    public String doPostJson(String url, Map<String, Object> params, Map<String, String> header) throws Exception {
        String json = null;
        if (params != null && !params.isEmpty()) {
            for (Iterator<Entry<String, Object>> it = params.entrySet().iterator(); it.hasNext();) {
                Map.Entry<String, Object> entry = (Entry<String, Object>) it.next();
                Object object = entry.getValue();
                if (object == null) {
                    it.remove();
                }
            }
            json = gson.toJson(params);
            //json = JSON.toJSON(params);
        }
        return postJson(url, json, header);
    }

    public String doPostJson(String url, String json) throws Exception {
        return doPostJson(url, json, null);
    }

    public String doPostJson(String url, String json, Map<String, String> header) throws Exception {
        return postJson(url, json, header);
    }

    private String postJson(String url, String json, Map<String, String> header) throws Exception {
        String body = null;
        try {
            // Post请求
            log.debug(" protocol: POST");
            log.debug("      url: " + url);
            HttpPost httpPost = new HttpPost(url.trim());
            RequestConfig requestConfig = RequestConfig.custom().setConnectionRequestTimeout(timeOut) .setConnectTimeout(timeOut).setSocketTimeout(timeOut).build();
            httpPost.setConfig(requestConfig);
            // 设置参数
            log.debug("   params: " + json);
            StringEntity entity = new StringEntity(json, ContentType.DEFAULT_TEXT.withCharset(charset));
            httpPost.setEntity(entity);
            httpPost.setHeader(new BasicHeader("Content-Type", "application/json"));
            log.debug("     type: JSON");
            // 设置Header
            if (header != null && !header.isEmpty()) {
                log.debug("   header: " + gson.toJson(header));
                for (Iterator<Entry<String, String>> it = header.entrySet().iterator(); it.hasNext();) {
                    Map.Entry<String, String> entry = (Entry<String, String>) it.next();
                    httpPost.setHeader(new BasicHeader(entry.getKey(), entry.getValue()));
                }
            }
            // 发送请求,获取返回数据
            body = execute(httpPost);
        } catch (Exception e) {
            throw e;
        }
        log.debug("  result: " + body);
        return body;
    }

    /**
     * get请求
     */
    public String doGet(String url) throws Exception {
        return doGet(url, null, null);
    }

    public String doGet(String url, Map<String, String> header) throws Exception {
        return doGet(url, null, header);
    }

    public String doGet(String url, Map<String, Object> params, Map<String, String> header) throws Exception {
        String body = null;
        try {
            // Get请求
            log.debug("protocol: GET");
            HttpGet httpGet = new HttpGet(url.trim());
            RequestConfig requestConfig = RequestConfig.custom().setConnectionRequestTimeout(timeOut) .setConnectTimeout(timeOut).setSocketTimeout(timeOut).build();
            httpGet.setConfig(requestConfig);
            // 设置参数
            if (params != null && !params.isEmpty()) {
                String str = EntityUtils.toString(new UrlEncodedFormEntity(map2NameValuePairList(params), charset));
                String uri = httpGet.getURI().toString();
                if(uri.indexOf("?") >= 0){
                    httpGet.setURI(new URI(httpGet.getURI().toString() + "&" + str));
                }else {
                    httpGet.setURI(new URI(httpGet.getURI().toString() + "?" + str));
                }
            }
            log.debug("     url: " + httpGet.getURI());
            // 设置Header
            if (header != null && !header.isEmpty()) {
                log.debug("   header: " + header);
                for (Iterator<Entry<String, String>> it = header.entrySet().iterator(); it.hasNext();) {
                    Map.Entry<String, String> entry = (Entry<String, String>) it.next();
                    httpGet.setHeader(new BasicHeader(entry.getKey(), entry.getValue()));
                }
            }
            // 发送请求,获取返回数据
            body =  execute(httpGet);
        } catch (Exception e) {
            throw e;
        }
        log.debug("  result: " + body);
        return body;
    }

    /**
     * 下载文件
     */
    public void doDownload(String url, String path) throws Exception {
        download(url, null, path);
    }

    public void doDownload(String url, Map<String, Object> params, String path) throws Exception {
        download(url, params, path);
    }

    /**
     * 上传文件
     */
    public String doUpload(String url, String name, String path) throws Exception {
        Map<String, Object> params = new HashMap<String, Object>();
        params.put(name, new File(path));
        return doUpload(url, params);
    }

    public String doUpload(String url, Map<String, Object> params) throws Exception {
        String body = null;
        // Post请求
        HttpPost httpPost = new HttpPost(url.trim());
        // 设置参数
        MultipartEntityBuilder entityBuilder = MultipartEntityBuilder.create();
        entityBuilder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);
        entityBuilder.setCharset(charset);
        if (params != null && !params.isEmpty()) {
            Iterator<String> it = params.keySet().iterator();
            while (it.hasNext()) {
                String key = it.next();
                Object value = params.get(key);
                if (value instanceof File) {
                    FileBody fileBody = new FileBody((File) value);
                    entityBuilder.addPart(key, fileBody);
                } else {
                    entityBuilder.addPart(key, new StringBody(String.valueOf(value), ContentType.DEFAULT_TEXT.withCharset(charset)));
                }
            }
        }
        HttpEntity entity = entityBuilder.build();
        httpPost.setEntity(entity);
        // 发送请求,获取返回数据
        body = execute(httpPost);
        return body;
    }

    private void download(String url, Map<String, Object> params, String path) throws Exception {
        // Get请求
        HttpGet httpGet = new HttpGet(url.trim());
        if (params != null && !params.isEmpty()) {
            // 设置参数
            String str = EntityUtils.toString(new UrlEncodedFormEntity(map2NameValuePairList(params)));
            String uri = httpGet.getURI().toString();
            if (uri.indexOf("?") >= 0) {
                httpGet.setURI(new URI(httpGet.getURI().toString() + "&" + str));
            } else {
                httpGet.setURI(new URI(httpGet.getURI().toString() + "?" + str));
            }
        }
        // 发送请求,下载文件
        downloadFile(httpGet, path);
    }

    private void downloadFile(HttpRequestBase requestBase, String path) throws Exception {
        CloseableHttpClient httpclient = HttpClients.createDefault();
        try {
            CloseableHttpResponse response = httpclient.execute(requestBase);
            try {
                HttpEntity entity = response.getEntity();

                if (entity != null) {
                    byte[] b = EntityUtils.toByteArray(entity);
                    OutputStream out = new BufferedOutputStream(new FileOutputStream(new File(path)));
                    out.write(b);
                    out.flush();
                    out.close();
                }
                EntityUtils.consume(entity);
            } catch (Exception e) {
                throw e;
            } finally {
                response.close();
            }
        } catch (Exception e) {
            throw e;
        } finally {
            httpclient.close();
        }
    }

    private String execute(HttpRequestBase requestBase) throws Exception {
        CloseableHttpClient httpclient = getHttpsClient();
        HttpParams params=httpclient.getParams();
        params.setParameter(CoreConnectionPNames.CONNECTION_TIMEOUT, timeOut);
        params.setParameter(CoreConnectionPNames.SO_TIMEOUT, timeOut);
        String body = null;
        try {
            CloseableHttpResponse response = httpclient.execute(requestBase);
            try {
                HttpEntity entity = response.getEntity();

                if (entity != null) {
                    body = EntityUtils.toString(entity, charset.toString());
                }
                EntityUtils.consume(entity);
            } catch (Exception e) {
                throw e;
            }finally {
                response.close();
            }
        } catch (Exception e) {
            throw e;
        } finally {
            httpclient.close();
        }
        return body;
    }

    private List<NameValuePair> map2NameValuePairList(Map<String, Object> params) {
        if (params != null && !params.isEmpty()) {
            List<NameValuePair> list = new ArrayList<NameValuePair>();
            Iterator<String> it = params.keySet().iterator();
            while (it.hasNext()) {
                String key = it.next();
                if(params.get(key) != null) {
                    String value = String.valueOf(params.get(key));
                    list.add(new BasicNameValuePair(key, value));
                }
            }
            return list;
        }
        return null;
    }

    public void downLoad(String url, String localFileName) {
        DefaultHttpClient httpClient = new DefaultHttpClient();
        OutputStream out = null;
        InputStream in = null;

        try {
            HttpGet httpGet = new HttpGet(url);
            HttpResponse httpResponse = httpClient.execute(httpGet);
            HttpEntity entity = httpResponse.getEntity();
            in = entity.getContent();

            long length = entity.getContentLength();
            if (length <= 0) {
                System.out.println("下载文件不存在！");
                return;
            }

            System.out.println("The response value of token:" + httpResponse.getFirstHeader("token"));

            File file = new File(localFileName);
            if(!file.exists()){
                file.createNewFile();
            }

            out = new FileOutputStream(file);
            byte[] buffer = new byte[4096];
            int readLength = 0;
            while ((readLength=in.read(buffer)) > 0) {
                byte[] bytes = new byte[readLength];
                System.arraycopy(buffer, 0, bytes, 0, readLength);
                out.write(bytes);
            }

            out.flush();

        }catch (Exception e){
            e.printStackTrace();
        }finally{
            try {
                if(in != null){
                    in.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }

            try {
                if(out != null){
                    out.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

}