Java中的httpclient4.5应该怎么使用？

Posted 2023-04-11

代码如下：

package org.apache.http.examples.client;
import java.net.URI;
import java.util.List;
import org.apache.http.HttpEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpUriRequest;
import org.apache.http.client.methods.RequestBuilder;
import org.apache.http.cookie.Cookie;
import org.apache.http.impl.client.BasicCookieStore;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;


/**
* A example that demonstrates how HttpClient APIs can be used to perform
* form-based logon.
*/


public class ClientFormLogin  public static void main(String[] args) throws Exception        BasicCookieStore cookieStore = new BasicCookieStore();
CloseableHttpClient httpclient = HttpClients.custom()
.setDefaultCookieStore(cookieStore)
.build();
try


HttpGet httpget = new HttpGet("https://someportal/");
CloseableHttpResponse response1 = httpclient.execute(httpget);
try HttpEntity entity = response1.getEntity();
System.out.println("Login form get: " + response1.getStatusLine());
EntityUtils.consume(entity);
System.out.println("Initial set of cookies:");


List<Cookie> cookies = cookieStore.getCookies();
if (cookies.isEmpty()) System.out.println("None"); else for (int i = 0; i < cookies.size(); i++)  System.out.println("- " + cookies.get(i).toString());             finally response1.close();


HttpUriRequest login = RequestBuilder.post()
.setUri(new URI("https://someportal/"))
.addParameter("IDToken1", "username")
addParameter("IDToken2", "password")
.build();CloseableHttpResponse response2 = httpclient.execute(login);

try HttpEntity entity = response2.getEntity();

System.out.println("Login form get: " + response2.getStatusLine()); EntityUtils.consume(entity);

System.out.println("Post logon cookies:")

List<Cookie> cookies = cookieStore.getCookies(); for (int i = 0; i < cookies.size();

i++) finally  response2.close();

finally

JAVA

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参考技术A

Java中的httpclient4.5使用：

HttpClient client = new HttpClient();
GetMethod get = new GetMethod(Url);
client.executeMethod(get);
if (get.getStatusCode() != HttpStatus.SC_OK)
System.out.println("无返回或返回不正确");

String repMsg = get.getResponseBodyAsString();

一、所需要的jar包
httpclient-4.5.jar
httpcore-4.4.1.jar
httpmime-4.5.jar
二、实例
Java代码  
package cn.tzz.apache.httpclient;  

import java.io.File;  
import java.io.IOException;  
import java.net.URL;  
import java.util.ArrayList;  
import java.util.List;  
import java.util.Map;

import org.apache.http.HttpEntity;  
import org.apache.http.NameValuePair;  
import org.apache.http.client.config.RequestConfig;  
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.conn.ssl.DefaultHostnameVerifier;  
import org.apache.http.conn.util.PublicSuffixMatcher;  
import org.apache.http.conn.util.PublicSuffixMatcherLoader;  
import org.apache.http.entity.ContentType;  
import org.apache.http.entity.StringEntity;  
import org.apache.http.entity.mime.MultipartEntityBuilder;  
import org.apache.http.entity.mime.content.FileBody;  
import org.apache.http.entity.mime.content.StringBody;  
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 HttpClientUtil
private RequestConfig requestConfig = RequestConfig.custom()
.setSocketTimeout(15000)
.setConnectTimeout(15000)
.setConnectionRequestTimeout(15000)
.build();

private static HttpClientUtil instance = null;
private HttpClientUtil()
public static HttpClientUtil getInstance()
if (instance == null)
instance = new HttpClientUtil();

return instance;


/**
* 发送 post请求
* @param httpUrl 地址
*/
public String sendHttpPost(String httpUrl)
HttpPost httpPost = new HttpPost(httpUrl);// 创建httpPost
return sendHttpPost(httpPost);


/**
* 发送 post请求
* @param httpUrl 地址
* @param params 参数(格式:key1=value1&key2=value2)
*/
public String sendHttpPost(String httpUrl, String params)
HttpPost httpPost = new HttpPost(httpUrl);// 创建httpPost
try
//设置参数
StringEntity stringEntity = new StringEntity(params, "UTF-8");
stringEntity.setContentType("application/x-www-form-urlencoded");
httpPost.setEntity(stringEntity);
catch (Exception e)
e.printStackTrace();

return sendHttpPost(httpPost);


/**
* 发送 post请求
* @param httpUrl 地址
* @param maps 参数
*/
public String sendHttpPost(String httpUrl, Map<String, String> maps)
HttpPost httpPost = new HttpPost(httpUrl);// 创建httpPost
// 创建参数队列
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
for (String key : maps.keySet())
nameValuePairs.add(new BasicNameValuePair(key, maps.get(key)));

try
httpPost.setEntity(new UrlEncodedFormEntity(nameValuePairs, "UTF-8"));
catch (Exception e)
e.printStackTrace();

return sendHttpPost(httpPost);
 

/**
* 发送 post请求（带文件）
* @param httpUrl 地址
* @param maps 参数
* @param fileLists 附件
*/
public String sendHttpPost(String httpUrl, Map<String, String> maps, List<File> fileLists)
HttpPost httpPost = new HttpPost(httpUrl);// 创建httpPost
MultipartEntityBuilder meBuilder = MultipartEntityBuilder.create();
for (String key : maps.keySet())
meBuilder.addPart(key, new StringBody(maps.get(key), ContentType.TEXT_PLAIN));

for(File file : fileLists)
FileBody fileBody = new FileBody(file);
meBuilder.addPart("files", fileBody);

HttpEntity reqEntity = meBuilder.build();
httpPost.setEntity(reqEntity);
return sendHttpPost(httpPost);


/**
* 发送Post请求
* @param httpPost
* @return
*/
private String sendHttpPost(HttpPost httpPost)
CloseableHttpClient httpClient = null;
CloseableHttpResponse response = null;
HttpEntity entity = null;
String responseContent = null;
try
// 创建默认的httpClient实例.
httpClient = HttpClients.createDefault();
httpPost.setConfig(requestConfig);
// 执行请求
response = httpClient.execute(httpPost);
entity = response.getEntity();
responseContent = EntityUtils.toString(entity, "UTF-8");
catch (Exception e)
e.printStackTrace();
finally
try
// 关闭连接,释放资源
if (response != null)
response.close();

if (httpClient != null)
httpClient.close();

catch (IOException e)
e.printStackTrace();


return responseContent;


/**
* 发送 get请求
* @param httpUrl
*/
public String sendHttpGet(String httpUrl)
HttpGet httpGet = new HttpGet(httpUrl);// 创建get请求
return sendHttpGet(httpGet);


/**
* 发送 get请求Https
* @param httpUrl
*/
public String sendHttpsGet(String httpUrl)
HttpGet httpGet = new HttpGet(httpUrl);// 创建get请求
return sendHttpsGet(httpGet);


/**
* 发送Get请求
* @param httpPost
* @return
*/
private String sendHttpGet(HttpGet httpGet)
CloseableHttpClient httpClient = null;
CloseableHttpResponse response = null;
HttpEntity entity = null;
String responseContent = null;
try
// 创建默认的httpClient实例.
httpClient = HttpClients.createDefault();
httpGet.setConfig(requestConfig);
// 执行请求
response = httpClient.execute(httpGet);
entity = response.getEntity();
responseContent = EntityUtils.toString(entity, "UTF-8");
catch (Exception e)
e.printStackTrace();
finally
try
// 关闭连接,释放资源
if (response != null)
response.close();

if (httpClient != null)
httpClient.close();

catch (IOException e)
e.printStackTrace();


return responseContent;


/**
* 发送Get请求Https
* @param httpPost
* @return
*/
private String sendHttpsGet(HttpGet httpGet)
CloseableHttpClient httpClient = null;
CloseableHttpResponse response = null;
HttpEntity entity = null;
String responseContent = null;
try
// 创建默认的httpClient实例.
PublicSuffixMatcher publicSuffixMatcher = PublicSuffixMatcherLoader.load(new URL(httpGet.getURI().toString()));
DefaultHostnameVerifier hostnameVerifier = new DefaultHostnameVerifier(publicSuffixMatcher);
httpClient = HttpClients.custom().setSSLHostnameVerifier(hostnameVerifier).build();
httpGet.setConfig(requestConfig);
// 执行请求
response = httpClient.execute(httpGet);
entity = response.getEntity();
responseContent = EntityUtils.toString(entity, "UTF-8");
catch (Exception e)
e.printStackTrace();
finally
try
// 关闭连接,释放资源
if (response != null)
response.close();

if (httpClient != null)
httpClient.close();

catch (IOException e)
e.printStackTrace();


return responseContent;
 

java,导入httpClient包postMethod如何向指定网页传入账号密码，并且获得跳转后页面的url？

已经导入httpClient和Htmlparser 包，现在要向某网站提交账号密码，模拟登陆功能，请问如何postMethod实现参数传递和使得页面跳转并获得跳转后页面的url？

httpClient包postMethod如何向指定网页传入账号密码
这步用HttpPost就可以成功了，如果别人向你回送跳转后页面的url，你就可以拿到，不然应该是拿不到的。追问

请问那HttpPost的参数设置如何对应网页的账号密码呢？

追答

留个邮箱，给你个demo跑一下

参考技术A webClient.setJavaScriptEnabled(true);
webClient.setJavaScriptTimeout(3600*1000);
webClient.setRedirectEnabled(true);
webClient.setThrowExceptionOnScriptError(true);
webClient.setThrowExceptionOnFailingStatusCode(true);
webClient.setTimeout(3600*1000);

webClient.waitForBackgroundJavaScript(600*1000);
webClient.setAjaxController(new NicelyResynchronizingAjaxController());

// if (Integer.parseInt(currentPage)<6)

page = (HtmlPage) webClient.getCurrentWindow().getEnclosedPage();
HtmlAnchor a=(HtmlAnchor)page.getAnchorByText(currentPage);
try
page=a.click();
Thread.sleep(time);
catch (Exception e1)
// TODO Auto-generated catch block
e1.printStackTrace();

page = (HtmlPage) webClient.getCurrentWindow().getEnclosedPage(); 参考技术B //传送数据
String requestData = g.toJson(paramMap);
//接收
String result = HttpClients.doPost(url, requestData);