httpClient入门到精通-------doGet

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get 无参请求

package cn.itcast.httpclient;import java.io.File;import org.apache.commons.io.FileUtils;import org.apache.http.client.methods.CloseableHttpResponse;import org.apache.http.client.methods.HttpGet;import org.apache.http.impl.client.CloseableHttpClient;import org.apache.http.impl.client.HttpClients;import org.apache.http.util.EntityUtils;public class DoGET {    public static void main(String[] args) throws Exception {        // 创建Httpclient对象        CloseableHttpClient httpclient = HttpClients.createDefault();        // 创建http GET请求        HttpGet httpGet = new HttpGet("http://www.baidu.com/");        CloseableHttpResponse response = null;        try {            // 执行请求            response = httpclient.execute(httpGet);            // 判断返回状态是否为200            if (response.getStatusLine().getStatusCode() == 200) {                String content = EntityUtils.toString(response.getEntity(), "UTF-8");                System.out.println("内容长度：" + content.length());//                FileUtils.writeStringToFile(new File("C:\\baidu.html"), content);            }        } finally {            if (response != null) {                response.close();            }            httpclient.close();        }    }}

get有参请求

package cn.itcast.httpclient;import java.net.URI;import org.apache.http.client.methods.CloseableHttpResponse;import org.apache.http.client.methods.HttpGet;import org.apache.http.client.utils.URIBuilder;import org.apache.http.impl.client.CloseableHttpClient;import org.apache.http.impl.client.HttpClients;import org.apache.http.util.EntityUtils;public class DoGETParam {    public static void main(String[] args) throws Exception {        // 创建Httpclient对象        CloseableHttpClient httpclient = HttpClients.createDefault();        // 定义请求的参数        URI uri = new URIBuilder("http://www.baidu.com/s").setParameter("wd", "java").build();        System.out.println(uri);        // 创建http GET请求        HttpGet httpGet = new HttpGet(uri);        CloseableHttpResponse response = null;        try {            // 执行请求            response = httpclient.execute(httpGet);            // 判断返回状态是否为200            if (response.getStatusLine().getStatusCode() == 200) {                String content = EntityUtils.toString(response.getEntity(), "UTF-8");                System.out.println(content);            }        } finally {            if (response != null) {                response.close();            }            httpclient.close();        }    }}

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