HttpClient设置请求及处理响应

设置请求头：

package com.dahai.httpclientTest;

import org.apache.http.Header;
import org.apache.http.client.methods.HttpPost;

public class HttpClientRequestHeaderTest {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        HttpPost httppost = new HttpPost("");
        httppost.addHeader("Cookie", "key1=value1;key2=value2");
        httppost.addHeader("User-Agent","My user Agent");
        for(Header h:httppost.getAllHeaders()){
            System.out.println(h);
        }
    }

}

控制台输出：

Cookie: key1=value1;key2=value2
User-Agent: My user Agent

HTTP请求可以通过addHeader()方法设置请求头，通过getAllHeaders()方法获取所有请求头信息（用一个请求头数组表示）

一般POST请求需要设置的请求头包括：

method:POST

scheme:http,https

accept:代表客户端希望接受的数据类型，一般包括：application/json, text/xml, */*等

Content-Type:代表发送端发送的实体数据的数据类型，一般包括：application/json, text/xml, */*等

cookie：指某些网站为了辨别用户身份、进行session跟踪而储存在用户本地终端上的数据

user-agent：访问者使用的工具

 

响应处理：

package com.dahai.httpclientTest;

import java.io.IOException;

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;

public class HttpClientResponseTest {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        CloseableHttpClient client = HttpClients.createDefault();
        HttpGet httpget = new HttpGet("http://localhost:8080/mobilePhone?model=iPhone+6S");
        CloseableHttpResponse response = null;
        try {
            response = client.execute(httpget);
            //
            System.out.println(response.getProtocolVersion());
            System.out.println(response.getStatusLine().getStatusCode());
            System.out.println(response.getStatusLine().toString());
            System.out.println(response.getEntity().getContentType());
            //关闭服务器响应
            response.close();
        } catch (ClientProtocolException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

}

控制台输出：

HTTP/1.1
200
HTTP/1.1 200
Content-Type: application/json;charset=UTF-8

response.getProtocolVersion()：获取响应的协议版本

response.getStatusLine().getStatusCode()：获取响应的响应行及响应码

response.getStatusLine().toString()：获取响应的响应行并将整个响应行转换成字符串

response.getEntity().getContentType()：获取响应实体并通过实体得到Content-Type

response.getAllHeaders()：获取响应头内容（用一个请求头数组表示），可通过for(Header h:response.getAllHeaders()){System.out.println(h)}打印出来