grails3 httpClient4.5.1 基本使用

在grails3 中引入httpclient相关jar

 

apache 的client-4.5.x依赖列表：

http://hc.apache.org/httpcomponents-client-4.5.x/httpclient/dependency-info.html

 

grails 的httpclient插件地址：

https://repo.grails.org/grails/core/org/apache/httpcomponents/httpclient/

 

注意：这里build.gradle文件中我刚开始引入的是4.5.2，而且grails库中也是有的，但编译器提示找不到资源不能下载：（我grails使用的版本是3.1.5）

compile 'org.apache.httpcomponents:httpclient:4.5.2'

 换成4.5.1后通过

compile 'org.apache.httpcomponents:httpclient:4.5.1'

 

 httpclient 4.5.2 API：

http://hc.apache.org/httpcomponents-client-ga/httpclient/apidocs/

 

apache提供的示例：

http://hc.apache.org/httpcomponents-client-4.5.x/quickstart.html

package org.apache.http.examples.client;

import java.util.ArrayList;
import java.util.List;

import org.apache.http.HttpEntity;
import org.apache.http.NameValuePair;
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.util.EntityUtils;

public class QuickStart {

    public static void main(String[] args) throws Exception {
        CloseableHttpClient httpclient = HttpClients.createDefault();
        try {
            HttpGet httpGet = new HttpGet("http://httpbin.org/get");
            CloseableHttpResponse response1 = httpclient.execute(httpGet);
            // The underlying HTTP connection is still held by the response object
            // to allow the response content to be streamed directly from the network socket.
            // In order to ensure correct deallocation of system resources
            // the user MUST call CloseableHttpResponse#close() from a finally clause.
            // Please note that if response content is not fully consumed the underlying
            // connection cannot be safely re-used and will be shut down and discarded
            // by the connection manager.
            try {
                System.out.println(response1.getStatusLine());
                HttpEntity entity1 = response1.getEntity();
                // do something useful with the response body
                // and ensure it is fully consumed
                EntityUtils.consume(entity1);
            } finally {
                response1.close();
            }

            HttpPost httpPost = new HttpPost("http://httpbin.org/post");
            List <NameValuePair> nvps = new ArrayList <NameValuePair>();
            nvps.add(new BasicNameValuePair("username", "vip"));
            nvps.add(new BasicNameValuePair("password", "secret"));
            httpPost.setEntity(new UrlEncodedFormEntity(nvps));
            CloseableHttpResponse response2 = httpclient.execute(httpPost);

            try {
                System.out.println(response2.getStatusLine());
                HttpEntity entity2 = response2.getEntity();
                // do something useful with the response body
                // and ensure it is fully consumed
                EntityUtils.consume(entity2);
            } finally {
                response2.close();
            }
        } finally {
            httpclient.close();
        }
    }

}