（十一）文件的上传和下载

父类：

package com.automation.util.httpclient;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.alibaba.fastjson.parser.Feature;
import com.automation.pojo.HttpClientResult;
import org.apache.http.HttpStatus;
import org.apache.http.NameValuePair;
import org.apache.http.client.CookieStore;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpEntityEnclosingRequestBase;
import org.apache.http.client.methods.HttpRequestBase;
import org.apache.http.cookie.Cookie;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Set;

public class HttpClientUtil {

    // 编码格式。发送编码格式统一用UTF-8
    protected static final String ENCODING = "UTF-8";

    // 设置连接超时时间，单位毫秒。
    protected static final int CONNECT_TIMEOUT = 6000;

    // 请求获取数据的超时时间(即响应时间)，单位毫秒。
    protected static final int SOCKET_TIMEOUT = 6000;

    /**
     * Description: 封装请求头
     * @param params
     * @param httpMethod
     */
    public static void packageHeader(Map<String, String> params, HttpRequestBase httpMethod) {
        // 封装请求头
        if (params != null) {
            Set<Map.Entry<String, String>> entrySet = params.entrySet();
            for (Map.Entry<String, String> entry : entrySet) {
                // 设置到请求头到HttpRequestBase对象中
                httpMethod.setHeader(entry.getKey(), entry.getValue());
            }
        }
    }

    /**
     * Description: 封装请求参数
     *
     * @param params
     * @param httpMethod
     * @throws UnsupportedEncodingException
     */
    public static void packageParam(Map<String, String> params, HttpEntityEnclosingRequestBase httpMethod)
            throws UnsupportedEncodingException {
        // 封装请求参数
        if (params != null) {
            List<NameValuePair> nvps = new ArrayList<NameValuePair>();
            Set<Map.Entry<String, String>> entrySet = params.entrySet();
            for (Map.Entry<String, String> entry : entrySet) {
                nvps.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
            }

            // 设置到请求的http对象中
            httpMethod.setEntity(new UrlEncodedFormEntity(nvps, ENCODING));
        }
    }

    /**
     * Description: 封装json请求参数
     *
     * @param params
     * @param httpMethod
     * @throws UnsupportedEncodingException
     */
    public static void packageJsonParam(Map<String, String> params, HttpEntityEnclosingRequestBase httpMethod)
            throws UnsupportedEncodingException {
        // 封装请求参数
        if (params != null) {
            JSONObject jsonParam = new JSONObject();
            Set<Map.Entry<String,String>> entrySet = params.entrySet();
            for(Map.Entry<String,String> entry : entrySet){
                jsonParam.put(entry.getKey(),entry.getValue());
            }
            StringEntity entity = new StringEntity(jsonParam.toString(),ENCODING);
            entity.setContentEncoding(ENCODING);
            entity.setContentType("application/json");
            // 设置到请求的http对象中
            httpMethod.setEntity(entity);
        }
    }

    /**
     * Description: 获得响应结果
     *
     * @param httpResponse
     * @param httpClient
     * @param httpMethod
     * @return
     * @throws Exception
     */
    public static JSONObject getResponse(CloseableHttpResponse httpResponse,
                                         CloseableHttpClient httpClient, HttpRequestBase httpMethod) throws Exception {
        // 执行请求
        httpResponse = httpClient.execute(httpMethod);

        // 获取返回结果
        if (httpResponse != null && httpResponse.getStatusLine() != null) {
            StringBuffer content = new StringBuffer();
            if (httpResponse.getEntity() != null) {
                content.append(EntityUtils.toString(httpResponse.getEntity(), ENCODING));
            }
            return JSON.parseObject(content.toString(), Feature.OrderedField);
        }
        JSONObject data = new JSONObject();
        data.put("code","999");
        data.put("content","网络异常");
        return data;
    }

    /**
     * Description: 获得响应结果
     *
     * @param httpResponse
     * @param httpClient
     * @param httpMethod
     * @return
     * @throws Exception
     */
    public static HttpClientResult getHttpClientResult(CloseableHttpResponse httpResponse,
                                                       CloseableHttpClient httpClient, HttpRequestBase httpMethod) throws Exception {
        // 执行请求
        httpResponse = httpClient.execute(httpMethod);

        // 获取返回结果
        if (httpResponse != null && httpResponse.getStatusLine() != null) {
            String content = "";
            if (httpResponse.getEntity() != null) {
                content = EntityUtils.toString(httpResponse.getEntity(), ENCODING);
            }
            return new HttpClientResult(httpResponse.getStatusLine().getStatusCode(), content);
        }
        return new HttpClientResult(HttpStatus.SC_INTERNAL_SERVER_ERROR);
    }

    /**
     * Description: 获得响应结果
     *
     * @param httpResponse
     * @param httpClient
     * @param httpMethod
     * @return
     * @throws Exception
     */
    public static JSONObject getResponseCookie(CloseableHttpResponse httpResponse,
                                               CloseableHttpClient httpClient, HttpRequestBase httpMethod, CookieStore store) throws Exception {
        // 执行请求
        httpResponse = httpClient.execute(httpMethod);

        JSONObject CookieAndToken = new JSONObject();

        // 获取返回结果
        if (httpResponse != null && httpResponse.getStatusLine() != null) {
            StringBuffer content = new StringBuffer();
            if (httpResponse.getEntity() != null) {
                content.append(EntityUtils.toString(httpResponse.getEntity(), ENCODING));
            }

            List<Cookie> CookieList =  store.getCookies();
            String tmpCookie = "";
            for (Cookie cookie:CookieList){
                tmpCookie += cookie.getName() +"="+cookie.getValue()+";";
            }
            JSONObject data = JSON.parseObject(content.toString(), Feature.OrderedField).getJSONObject("data");

            String token = data.getString("token");

            CookieAndToken.put("token",token);
            CookieAndToken.put("cookie",tmpCookie.substring(0,tmpCookie.length()-1));

            return CookieAndToken;
        }
        JSONObject data = new JSONObject();
        data.put("code","999");
        data.put("content","网络异常");
        return data;
    }


    /**
     * Description: 释放资源
     *
     * @param httpResponse
     * @param httpClient
     * @throws IOException
     */
    public static void release(CloseableHttpResponse httpResponse, CloseableHttpClient httpClient) throws IOException {
        // 释放资源
        if (httpResponse != null) {
            httpResponse.close();
        }
        if (httpClient != null) {
            httpClient.close();
        }
    }

}

HttpClientFileUtil

package com.automation.util.httpclient;

import com.alibaba.fastjson.JSONObject;
import com.automation.util.FileUtil;
import org.apache.http.*;
import org.apache.http.client.HttpClient;
import org.apache.http.client.config.RequestConfig;
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.entity.mime.MultipartEntityBuilder;
import org.apache.http.entity.mime.content.ContentBody;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;

import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.util.Map;

public class HttpClientFileUtil extends HttpClientUtil{
    private static final int cache = 10 * 1024;
    //上传文件
    public static JSONObject postFileMultiPart(String url, Map<String, ContentBody> reqParam) throws Exception {
        CloseableHttpClient httpClient = HttpClients.createDefault();
        // 创建httpget.
        HttpPost httpPost = new HttpPost(url);

        //setConnectTimeout：设置连接超时时间，单位毫秒。setConnectionRequestTimeout：设置从connect Manager获取Connection 超时时间，单位毫秒。这个属性是新加的属性，因为目前版本是可以共享连接池的。setSocketTimeout：请求获取数据的超时时间，单位毫秒。 如果访问一个接口，多少时间内无法返回数据，就直接放弃此次调用。
        RequestConfig defaultRequestConfig = RequestConfig.custom().setConnectTimeout(5000).setConnectionRequestTimeout(5000).setSocketTimeout(15000).build();
        httpPost.setConfig(defaultRequestConfig);

        MultipartEntityBuilder multipartEntityBuilder = MultipartEntityBuilder.create();
        for(Map.Entry<String,ContentBody> param : reqParam.entrySet()){
            multipartEntityBuilder.addPart(param.getKey(), param.getValue());
        }
        HttpEntity reqEntity = multipartEntityBuilder.build();
        httpPost.setEntity(reqEntity);
        CloseableHttpResponse httpResponse = null;
        try{
            return getResponse(httpResponse,httpClient,httpPost);
        }finally {
            release(httpResponse,httpClient);
        }
    }

    //下载文件
    /**
     * 获取response header中Content-Disposition中的filename值
     *
     * @param
     * @return
     */
    public static int downloadFileByGet(String url, String filepath, Map<String, String> headers,String fileName){
        int StatusCode = 0;
        try {
            HttpClient client = HttpClients.createDefault();
            HttpGet httpget = new HttpGet(url);
            httpget.setConfig(RequestConfig.custom().setConnectTimeout(CONNECT_TIMEOUT).setSocketTimeout(SOCKET_TIMEOUT).build());
            //封装请求头
            packageHeader(headers,httpget);

            HttpResponse response = client.execute(httpget);
            StatusCode = response.getStatusLine().getStatusCode();
            HttpEntity entity = response.getEntity();
            InputStream is = entity.getContent();

            if (fileName == null){
                fileName = getFileName(response);
            }

            if (filepath == null){
                filepath = FileUtil.getResourcesPath("excel"+FileUtil.getSplash()+"download"+FileUtil.getSplash()+fileName);
            }

            File file = new File(filepath);
            file.getParentFile().mkdirs();
            FileOutputStream fileout = new FileOutputStream(file);
            /**
             * 根据实际运行效果 设置缓冲区大小
             */
            byte[] buffer = new byte[cache];
            int ch = 0;
            while ((ch = is.read(buffer)) != -1) {
                fileout.write(buffer, 0, ch);
            }
            is.close();
            fileout.flush();
            fileout.close();

        } catch (Exception e) {
            e.printStackTrace();
        }
        return StatusCode;
    }

    public static String getFileName(HttpResponse response) {
        Header contentHeader = response.getFirstHeader("Content-Disposition");
        String filename = null;
        if (contentHeader != null) {
            HeaderElement[] values = contentHeader.getElements();
            if (values.length == 1) {
                NameValuePair param = values[0].getParameterByName("filename");
                if (param != null) {
                    try {
                        filename = param.getValue();
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
            }
        }
        return filename;
    }
}