HttpClient使用示例

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以下为使用HttpClient 4.3的示例代码，仅供参考！
包括了:
- HttpClient连接SSL
- post方式提交表单（模拟用户登录请求）
- 发送 post请求访问本地应用并根据传递参数不同返回不同结果
- 发送 get请求
- 上传文件
package test;import java.io.File;import java.io.FileInputStream;import java.io.IOException;import java.io.UnsupportedEncodingException;import java.security.KeyManagementException;import java.security.KeyStore;import java.security.KeyStoreException;import java.security.NoSuchAlgorithmException;import java.security.cert.CertificateException;import java.util.ArrayList;import java.util.List;import javax.net.ssl.SSLContext;import org.apache.http.HttpEntity;import org.apache.http.NameValuePair;import org.apache.http.ParseException;import org.apache.http.client.ClientProtocolException;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.SSLConnectionSocketFactory;import org.apache.http.conn.ssl.SSLContexts;import org.apache.http.conn.ssl.TrustSelfSignedStrategy;import org.apache.http.entity.ContentType;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;import org.junit.Test;public class HttpClientTest {    @Test    public void jUnitTest() {        get();    }    /**     * HttpClient连接SSL     */    public void ssl() {        CloseableHttpClient httpclient = null;        try {            KeyStore trustStore = KeyStore.getInstance(KeyStore.getDefaultType());            FileInputStream instream = new FileInputStream(new File("d:\\tomcat.keystore"));            try {                // 加载keyStore d:\\tomcat.keystore                trustStore.load(instream, "123456".toCharArray());            } catch (CertificateException e) {                e.printStackTrace();            } finally {                try {                    instream.close();                } catch (Exception ignore) {                }            }            // 相信自己的CA和所有自签名的证书            SSLContext sslcontext = SSLContexts.custom().loadTrustMaterial(trustStore, new TrustSelfSignedStrategy()).build();            // 只允许使用TLSv1协议            SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(sslcontext, new String[] { "TLSv1" }, null,                    SSLConnectionSocketFactory.BROWSER_COMPATIBLE_HOSTNAME_VERIFIER);            httpclient = HttpClients.custom().setSSLSocketFactory(sslsf).build();            // 创建http请求(get方式)            HttpGet httpget = new HttpGet("https://localhost:8443/myDemo/Ajax/serivceJ.action");            System.out.println("executing request" + httpget.getRequestLine());            CloseableHttpResponse response = httpclient.execute(httpget);            try {                HttpEntity entity = response.getEntity();                System.out.println("----------------------------------------");                System.out.println(response.getStatusLine());                if (entity != null) {                    System.out.println("Response content length: " + entity.getContentLength());                    System.out.println(EntityUtils.toString(entity));                    EntityUtils.consume(entity);                }            } finally {                response.close();            }        } catch (ParseException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        } catch (KeyManagementException e) {            e.printStackTrace();        } catch (NoSuchAlgorithmException e) {            e.printStackTrace();        } catch (KeyStoreException e) {            e.printStackTrace();        } finally {            if (httpclient != null) {                try {                    httpclient.close();                } catch (IOException e) {                    e.printStackTrace();                }            }        }    }    /**     * post方式提交表单（模拟用户登录请求）     */    public void postForm() {        // 创建默认的httpClient实例.        CloseableHttpClient httpclient = HttpClients.createDefault();        // 创建httppost        HttpPost httppost = new HttpPost("http://localhost:8080/myDemo/Ajax/serivceJ.action");        // 创建参数队列        List<NameValuePair> formparams = new ArrayList<NameValuePair>();        formparams.add(new BasicNameValuePair("username", "admin"));        formparams.add(new BasicNameValuePair("password", "123456"));        UrlEncodedFormEntity uefEntity;        try {            uefEntity = new UrlEncodedFormEntity(formparams, "UTF-8");            httppost.setEntity(uefEntity);            System.out.println("executing request " + httppost.getURI());            CloseableHttpResponse response = httpclient.execute(httppost);            try {                HttpEntity entity = response.getEntity();                if (entity != null) {                    System.out.println("--------------------------------------");                    System.out.println("Response content: " + EntityUtils.toString(entity, "UTF-8"));                    System.out.println("--------------------------------------");                }            } finally {                response.close();            }        } catch (ClientProtocolException e) {            e.printStackTrace();        } catch (UnsupportedEncodingException e1) {            e1.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        } finally {            // 关闭连接,释放资源            try {                httpclient.close();            } catch (IOException e) {                e.printStackTrace();            }        }    }    /**     * 发送 post请求访问本地应用并根据传递参数不同返回不同结果     */    public void post() {        // 创建默认的httpClient实例.        CloseableHttpClient httpclient = HttpClients.createDefault();        // 创建httppost        HttpPost httppost = new HttpPost("http://localhost:8080/myDemo/Ajax/serivceJ.action");        // 创建参数队列        List<NameValuePair> formparams = new ArrayList<NameValuePair>();        formparams.add(new BasicNameValuePair("type", "house"));        UrlEncodedFormEntity uefEntity;        try {            uefEntity = new UrlEncodedFormEntity(formparams, "UTF-8");            httppost.setEntity(uefEntity);            System.out.println("executing request " + httppost.getURI());            CloseableHttpResponse response = httpclient.execute(httppost);            try {                HttpEntity entity = response.getEntity();                if (entity != null) {                    System.out.println("--------------------------------------");                    System.out.println("Response content: " + EntityUtils.toString(entity, "UTF-8"));                    System.out.println("--------------------------------------");                }            } finally {                response.close();            }        } catch (ClientProtocolException e) {            e.printStackTrace();        } catch (UnsupportedEncodingException e1) {            e1.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        } finally {            // 关闭连接,释放资源            try {                httpclient.close();            } catch (IOException e) {                e.printStackTrace();            }        }    }    /**     * 发送 get请求     */    public void get() {        CloseableHttpClient httpclient = HttpClients.createDefault();        try {            // 创建httpget.            HttpGet httpget = new HttpGet("http://www.baidu.com/");            System.out.println("executing request " + httpget.getURI());            // 执行get请求.            CloseableHttpResponse response = httpclient.execute(httpget);            try {                // 获取响应实体                HttpEntity entity = response.getEntity();                System.out.println("--------------------------------------");                // 打印响应状态                System.out.println(response.getStatusLine());                if (entity != null) {                    // 打印响应内容长度                    System.out.println("Response content length: " + entity.getContentLength());                    // 打印响应内容                    System.out.println("Response content: " + EntityUtils.toString(entity));                }                System.out.println("------------------------------------");            } finally {                response.close();            }        } catch (ClientProtocolException e) {            e.printStackTrace();        } catch (ParseException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        } finally {            // 关闭连接,释放资源            try {                httpclient.close();            } catch (IOException e) {                e.printStackTrace();            }        }    }    /**     * 上传文件     */    public void upload() {        CloseableHttpClient httpclient = HttpClients.createDefault();        try {            HttpPost httppost = new HttpPost("http://localhost:8080/myDemo/Ajax/serivceFile.action");            FileBody bin = new FileBody(new File("F:\\image\\sendpix0.jpg"));            StringBody comment = new StringBody("A binary file of some kind", ContentType.TEXT_PLAIN);            HttpEntity reqEntity = MultipartEntityBuilder.create().addPart("bin", bin).addPart("comment", comment).build();            httppost.setEntity(reqEntity);            System.out.println("executing request " + httppost.getRequestLine());            CloseableHttpResponse response = httpclient.execute(httppost);            try {                System.out.println("----------------------------------------");                System.out.println(response.getStatusLine());                HttpEntity resEntity = response.getEntity();                if (resEntity != null) {                    System.out.println("Response content length: " + resEntity.getContentLength());                }                EntityUtils.consume(resEntity);            } finally {                response.close();            }        } catch (ClientProtocolException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        } finally {            try {                httpclient.close();            } catch (IOException e) {                e.printStackTrace();            }        }    }}
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