Http的Post/Get请求示例-蒲公英云

一、所需要的jar包

httpclient-4.5.jar

httpcore-4.4.1.jar

httpmime-4.5.jar

二、实例

package cn.tzz.apache.httpclient;
import java.io.File;
import java.io.IOException;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import org.apache.http.HttpEntity;
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.conn.ssl.DefaultHostnameVerifier;
import org.apache.http.conn.util.PublicSuffixMatcher;
import org.apache.http.conn.util.PublicSuffixMatcherLoader;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.StringEntity;
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.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
public class HttpClientUtil {
    private RequestConfig requestConfig = RequestConfig.custom()
            .setSocketTimeout(15000)
            .setConnectTimeout(15000)
            .setConnectionRequestTimeout(15000)
            .build();
    private static HttpClientUtil instance = null;
    private HttpClientUtil(){}
    public static HttpClientUtil getInstance(){
        if (instance == null) {
            instance = new HttpClientUtil();
        }
        return instance;
    }
    /**
     * 发送 post请求
     * @param httpUrl 地址
     */
    public String sendHttpPost(String httpUrl) {
        HttpPost httpPost = new HttpPost(httpUrl);// 创建httpPost  
        return sendHttpPost(httpPost);
    }
    /**
     * 发送 post请求
     * @param httpUrl 地址
     * @param params 参数(格式:key1=value1&key2=value2)
     */
    public String sendHttpPost(String httpUrl, String params) {
        HttpPost httpPost = new HttpPost(httpUrl);// 创建httpPost  
        try {
            //设置参数
            StringEntity stringEntity = new StringEntity(params, "UTF-8");
            stringEntity.setContentType("application/x-www-form-urlencoded");
            httpPost.setEntity(stringEntity);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return sendHttpPost(httpPost);
    }
    /**
     * 发送 post请求
     * @param httpUrl 地址
     * @param maps 参数
     */
    public String sendHttpPost(String httpUrl, Map<String, String> maps) {
        HttpPost httpPost = new HttpPost(httpUrl);// 创建httpPost  
        // 创建参数队列  
        List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
        for (String key : maps.keySet()) {
            nameValuePairs.add(new BasicNameValuePair(key, maps.get(key)));
        }
        try {
            httpPost.setEntity(new UrlEncodedFormEntity(nameValuePairs, "UTF-8"));
        } catch (Exception e) {
            e.printStackTrace();
        }
        return sendHttpPost(httpPost);
    }
    /**
     * 发送 post请求（带文件）
     * @param httpUrl 地址
     * @param maps 参数
     * @param fileLists 附件
     */
    public String sendHttpPost(String httpUrl, Map<String, String> maps, List<File> fileLists) {
        HttpPost httpPost = new HttpPost(httpUrl);// 创建httpPost  
        MultipartEntityBuilder meBuilder = MultipartEntityBuilder.create();
        for (String key : maps.keySet()) {
            meBuilder.addPart(key, new StringBody(maps.get(key), ContentType.TEXT_PLAIN));
        }
        for(File file : fileLists) {
            FileBody fileBody = new FileBody(file);
            meBuilder.addPart("files", fileBody);
        }
        HttpEntity reqEntity = meBuilder.build();
        httpPost.setEntity(reqEntity);
        return sendHttpPost(httpPost);
    }
    /**
     * 发送Post请求
     * @param httpPost
     * @return
     */
    private String sendHttpPost(HttpPost httpPost) {
        CloseableHttpClient httpClient = null;
        CloseableHttpResponse response = null;
        HttpEntity entity = null;
        String responseContent = null;
        try {
            // 创建默认的httpClient实例.
            httpClient = HttpClients.createDefault();
            httpPost.setConfig(requestConfig);
            // 执行请求
            response = httpClient.execute(httpPost);
            entity = response.getEntity();
            responseContent = EntityUtils.toString(entity, "UTF-8");
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                // 关闭连接,释放资源
                if (response != null) {
                    response.close();
                }
                if (httpClient != null) {
                    httpClient.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return responseContent;
    }
    /**
     * 发送 get请求
     * @param httpUrl
     */
    public String sendHttpGet(String httpUrl) {
        HttpGet httpGet = new HttpGet(httpUrl);// 创建get请求
        return sendHttpGet(httpGet);
    }
    /**
     * 发送 get请求Https
     * @param httpUrl
     */
    public String sendHttpsGet(String httpUrl) {
        HttpGet httpGet = new HttpGet(httpUrl);// 创建get请求
        return sendHttpsGet(httpGet);
    }
    /**
     * 发送Get请求
     * @param httpPost
     * @return
     */
    private String sendHttpGet(HttpGet httpGet) {
        CloseableHttpClient httpClient = null;
        CloseableHttpResponse response = null;
        HttpEntity entity = null;
        String responseContent = null;
        try {
            // 创建默认的httpClient实例.
            httpClient = HttpClients.createDefault();
            httpGet.setConfig(requestConfig);
            // 执行请求
            response = httpClient.execute(httpGet);
            entity = response.getEntity();
            responseContent = EntityUtils.toString(entity, "UTF-8");
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                // 关闭连接,释放资源
                if (response != null) {
                    response.close();
                }
                if (httpClient != null) {
                    httpClient.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return responseContent;
    }
    /**
     * 发送Get请求Https
     * @param httpPost
     * @return
     */
    private String sendHttpsGet(HttpGet httpGet) {
        CloseableHttpClient httpClient = null;
        CloseableHttpResponse response = null;
        HttpEntity entity = null;
        String responseContent = null;
        try {
            // 创建默认的httpClient实例.
            PublicSuffixMatcher publicSuffixMatcher = PublicSuffixMatcherLoader.load(new URL(httpGet.getURI().toString()));
            DefaultHostnameVerifier hostnameVerifier = new DefaultHostnameVerifier(publicSuffixMatcher);
            httpClient = HttpClients.custom().setSSLHostnameVerifier(hostnameVerifier).build();
            httpGet.setConfig(requestConfig);
            // 执行请求
            response = httpClient.execute(httpGet);
            entity = response.getEntity();
            responseContent = EntityUtils.toString(entity, "UTF-8");
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                // 关闭连接,释放资源
                if (response != null) {
                    response.close();
                }
                if (httpClient != null) {
                    httpClient.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return responseContent;
    }
}

三、测试代码

package cn.tzz.apache.httpclient;
import java.io.File;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.junit.Test;
public class HttpClientUtilTest {
    @Test
    public void testSendHttpPost1() {
        String responseContent = HttpClientUtil.getInstance()
                .sendHttpPost("http://localhost:8089/test/send?username=test01&password=123456");
        System.out.println("reponse content:" + responseContent);
    }
    @Test
    public void testSendHttpPost2() {
        String responseContent = HttpClientUtil.getInstance()
                .sendHttpPost("http://localhost:8089/test/send", "username=test01&password=123456");
        System.out.println("reponse content:" + responseContent);
    }
    @Test
    public void testSendHttpPost3() {
        Map<String, String> maps = new HashMap<String, String>();
        maps.put("username", "test01");
        maps.put("password", "123456");
        String responseContent = HttpClientUtil.getInstance()
                .sendHttpPost("http://localhost:8089/test/send", maps);
        System.out.println("reponse content:" + responseContent);
    }
    @Test
    public void testSendHttpPost4() {
        Map<String, String> maps = new HashMap<String, String>();
        maps.put("username", "test01");
        maps.put("password", "123456");
        List<File> fileLists = new ArrayList<File>();
        fileLists.add(new File("D://test//httpclient//1.png"));
        fileLists.add(new File("D://test//httpclient//1.txt"));
        String responseContent = HttpClientUtil.getInstance()
                .sendHttpPost("http://localhost:8089/test/sendpost/file", maps, fileLists);
        System.out.println("reponse content:" + responseContent);
    }
    @Test
    public void testSendHttpGet() {
        String responseContent = HttpClientUtil.getInstance()
                .sendHttpGet("http://localhost:8089/test/send?username=test01&password=123456");
        System.out.println("reponse content:" + responseContent);
    }
    @Test
    public void testSendHttpsGet() {
        String responseContent = HttpClientUtil.getInstance()
                .sendHttpsGet("https://www.baidu.com");
        System.out.println("reponse content:" + responseContent);
    }
}
@RequestMapping(value = "/test/send")
    @ResponseBody
    public Map<String, String> sendPost(HttpServletRequest request) {
        Map<String, String> maps = new HashMap<String, String>();
        String username = request.getParameter("username");
        String password = request.getParameter("password");
        maps.put("username", username);
        maps.put("password", password);
        return maps;
    }
    @RequestMapping(value = "/test/sendpost/file",method=RequestMethod.POST)
    @ResponseBody
    public Map<String, String> sendPostFile(@RequestParam("files") MultipartFile [] files,HttpServletRequest request) {
        Map<String, String> maps = new HashMap<String, String>();
        String username = request.getParameter("username");
        String password = request.getParameter("password");
        maps.put("username", username);
        maps.put("password", password);
        try {
            for(MultipartFile file : files){
                String fileName = file.getOriginalFilename();
                fileName = new String(fileName.getBytes(),"UTF-8");
                InputStream is = file.getInputStream();
                if (fileName != null && !("".equals(fileName))) {
                    File directory = new File("D://test//httpclient//file");
                    if (!directory.exists()) {
                        directory.mkdirs();
                    }
                    String filePath = ("D://test//httpclient//file") + File.separator + fileName;
                    FileOutputStream fos = new FileOutputStream(filePath);
                    byte[] buffer = new byte[1024];
                    while (is.read(buffer) > 0) {
                        fos.write(buffer, 0, buffer.length);
                    }
                    fos.flush();
                    fos.close();
                    maps.put("file--"+fileName, "uploadSuccess");
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return maps;
    }