HttpClient-get请求/Post请求/Post-Json/Header

1、Pom文件添加httpClient 依赖

        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
            <version>4.5.5</version>
        </dependency>          

2、 HttpGet

import java.io.IOException;

import org.apache.http.Header;
import org.apache.http.HttpEntity;
import org.apache.http.client.ClientProtocolException;
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 HttpTest {
    // main Alt+?
    public static void main(String[] args) {
        // 1.创建一个httpclient，默认的
        CloseableHttpClient client = HttpClients.createDefault();
        // 2.创建一个get请求方法
        HttpGet get = new HttpGet("http://mail.163.com");
        CloseableHttpResponse response = null;
        try {

            /////
            // 3.执行请求，获取到响应
            response = client.execute(get);

            System.out.println(response.getStatusLine());// 状态行
            System.out.println(response.getStatusLine().getStatusCode());// 状态码
            System.out.println(response.getStatusLine().getProtocolVersion());// 协议版本
            System.out.println(response.getStatusLine().getReasonPhrase());// 响应描述

            System.out.println("######################");
            Header[] allHeaders = response.getAllHeaders();
            System.out.println(allHeaders.length);
            for (int i = 0; i < allHeaders.length; i++) {
                System.out.println(allHeaders[i]);
            }
            System.out.println("################");
            System.out.println(response.getFirstHeader("Server"));
            System.out.println(response.getFirstHeader("Server").getValue());// 获取value
            System.out.println(response.getFirstHeader("Content-Type").getValue());// 获取value

            System.out.println("################");
            // 实体
            HttpEntity entity = response.getEntity();
            // 获取实体类型
            System.out.println(entity.getContentType());
            // 实体长度，文件下载最常用，一般网页无此参数
            System.out.println(entity.getContentLength());
            // EntityUtils实体类的工具包 ，将实体对象转成Stirng或者byte
            System.out.println(EntityUtils.toString(entity, "utf-8"));// 可以指定编码格式（中文：utf-8或者GBK）

        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (response != null)
                    response.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        // syso Alt+?
        System.out.println();
    }
}

3、HttpPost请求

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

import org.apache.http.HeaderIterator;
import org.apache.http.NameValuePair;
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.HttpPost;
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 LoginTest {
    public static void main(String[] args) {
        CloseableHttpClient client = HttpClients.createDefault();

        HttpPost post = new HttpPost("http://localhost/loginController/loginPage");
        // 表单参数，并放入list中
        NameValuePair username = new BasicNameValuePair("userName", "taki");
        NameValuePair password = new BasicNameValuePair("password", "1");

        List<NameValuePair> paramList = new ArrayList<NameValuePair>();
        paramList.add(username);
        paramList.add(password);

        CloseableHttpResponse response = null;
        try {
            // form实体，放入到请求中
            UrlEncodedFormEntity entity = new UrlEncodedFormEntity(paramList);
            post.setEntity(entity);

            response = client.execute(post);
            System.out.println(response.getStatusLine().getStatusCode());
            // 根据返回码，200为成功，继续操作
            if (response.getStatusLine().getStatusCode() == 200) {
                // 读取header
                HeaderIterator headerIterator = response.headerIterator();
                while (headerIterator.hasNext()) {
                    System.out.println(headerIterator.next());
                }
                System.out.println("####################");
                // 读取实体
                System.out.println(EntityUtils.toString(response.getEntity()));

            }

        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (response != null) {
                try {
                    response.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}

4、HttpPost 请求Json数据（该接口不通）

import java.io.IOException;
import java.io.UnsupportedEncodingException;

import org.apache.http.HeaderIterator;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;

public class JsonTest {

    public static void main(String[] args) {
        CloseableHttpClient client = HttpClients.createDefault();
        HttpPost post = new HttpPost("http://117.122.238.33/webservice/services/Rest/account");
        post.setHeader("Content-Type", "application/json");
        CloseableHttpResponse response = null;
        try {
            StringEntity entity = new StringEntity(
                    "{"name": "jiaminqiang","billingAddress": "beijing",  "phoneNumber": "15801396646"}");
            post.setEntity(entity);
            
            response = client.execute(post);
            System.out.println(response.getStatusLine().getStatusCode());
            if(response.getStatusLine().getStatusCode() == 201) {
                HeaderIterator headerIterator = response.headerIterator();
                while(headerIterator.hasNext()) {
                    System.out.println(headerIterator.next());
                }
                System.out.println("##############");
                System.out.println(EntityUtils.toString(response.getEntity()));
            }
            
        } catch (UnsupportedEncodingException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (ClientProtocolException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }finally {
            if(response!=null) {
                try {
                    response.close();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }

    }


}

5、Http添加Header

import org.apache.http.Header;
import org.apache.http.HeaderIterator;
import org.apache.http.HttpRequest;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.HttpVersion;
import org.apache.http.message.BasicHttpRequest;
import org.apache.http.message.BasicHttpResponse;

public class HeaderTest {

    public static void main(String[] args) {
        HttpResponse response = new BasicHttpResponse(HttpVersion.HTTP_1_1, 404, "not found");
        // request 操作header同response
        HttpRequest request = new BasicHttpRequest("post", "mail.163.com");
        request.addHeader("", "");
        //添加header name唯一
        response.setHeader("Set-Cookie", "test1");
        response.setHeader("Set-Cookie2", "test");
        //添加header name可重复
        response.addHeader("Set-Cookie", "test2");
        // Ctrl + 2 l 自动生成返回类型变量
        Header[] allHeaders = response.getAllHeaders();
        // Ctrl + d 删除一行
        // Ctrl + Shift + f 代码格式化
        // Ctrl + / 注释一行
        // Ctrl + Shift + / 多行注释
        // Ctrl + z 撤销
        // Ctrl + s 保存
        // Header[] allHeaders3 = response.getAllHeaders();
        // String [] s = {"1","2","aa"};
        // for(int i = 0;i<s.length;i++) {
        // System.out.println(s[i]);
        // }

        for (int i = 0; i < allHeaders.length; i++) {
            System.out.println(allHeaders[i]);
        }

        System.out.println(response.getStatusLine());

        System.out.println(response.getFirstHeader("Set-Cookie"));
        System.out.println(response.getLastHeader("Set-Cookie"));
        Header[] headers = response.getHeaders("Set-Cookie");
        System.out.println(headers[0]);
        System.out.println(headers[1]);
        // 遍历迭代器
        HeaderIterator headerIterator = response.headerIterator();
        // System.out.println(headerIterator.nextHeader());
        // System.out.println(headerIterator.nextHeader());
        System.out.println("###################");

        while (headerIterator.hasNext()) {
            System.out.println(headerIterator.nextHeader());
        }
    }

}