HttpClient模块的HttpGet和HttpPost

最近在使用Apache的httpclient的时候，maven引用了最新版本4.3,发现Idea提示DefaultHttpClient等常用的类已经不推荐使用了，之前在使用4.2.3版本的时候，还没有被deprecated。去看了下官方文档，确实不推荐使用了，点击此处详情。

• DefaultHttpClient —> CloseableHttpClient
• HttpResponse —> CloseableHttpResponse

<dependency>
    <groupId>org.apache.httpcomponentsgroupId>
    <artifactId>httpclientartifactId>
    <version>4.3version>
dependency>

新的用法如下，如下。

package com.somnus.http;

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

import org.apache.http.HttpEntity;
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.HttpGet;
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.protocol.HTTP;
import org.apache.http.util.EntityUtils;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * @Description: TODO
 * @author Somnus
 * @date 2015年12月16日 下午2:37:26
 * @version V1.0
 */
public class HttpClient {

    private transient Logger log = LoggerFactory.getLogger(this.getClass());

    @Test
    public void doGet() throws IOException {
        String uriAPI = "http://localhost:8080/SpringMVC/account/json";
        String result = "";
        // HttpGet httpRequst = new HttpGet(URI uri);
        // HttpGet httpRequst = new HttpGet(String uri);
        // 创建HttpGet或HttpPost对象，将要请求的URL通过构造方法传入HttpGet或HttpPost对象。
        HttpGet httpRequst = new HttpGet(uriAPI);
        CloseableHttpResponse httpResponse = null;
        try {
            CloseableHttpClient httpclient = HttpClients.createDefault();
            httpResponse = httpclient.execute(httpRequst);
            if (httpResponse.getStatusLine().getStatusCode() == 200) {
                HttpEntity httpEntity = httpResponse.getEntity();
                result = EntityUtils.toString(httpEntity);// 取出应答字符串
                // 一般来说都要删除多余的字符
                result.replaceAll("\r", "");// 去掉返回结果中的"\r"字符，否则会在结果字符串后面显示一个小方格
            } else
                httpRequst.abort();
        } catch (ClientProtocolException e) {
            log.error(e.getMessage(), e);
        } catch (IOException e) {
            log.error(e.getMessage(), e);
        } finally{
            httpResponse.close();
        }
        System.out.println(result);
    }

    @Test
    public void doPost() throws IOException {
        String uriAPI = "http://localhost:8080/SpringMVC/databind/json";// Post方式没有参数在这里
        String result = "";
        // 创建HttpPost对象
        HttpPost httpRequst = new HttpPost(uriAPI);

        List params = new ArrayList();
        params.add(new BasicNameValuePair("username", "admin"));
        params.add(new BasicNameValuePair("password", "123456"));
        CloseableHttpResponse httpResponse = null;

        try {
            httpRequst.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8));
            CloseableHttpClient httpclient = HttpClients.createDefault();
            httpResponse = httpclient.execute(httpRequst);
            if (httpResponse.getStatusLine().getStatusCode() == 200) {
                HttpEntity httpEntity = httpResponse.getEntity();
                result = EntityUtils.toString(httpEntity);// 取出应答字符串
            }
        } catch (UnsupportedEncodingException e) {
            log.error(e.getMessage(), e);
        } catch (ClientProtocolException e) {
            log.error(e.getMessage(), e);
        } catch (IOException e) {
            log.error(e.getMessage(), e);
        } finally{
            httpResponse.close();
        }
        System.out.println(result);
    }
}