HttpClient 远程接口调用方式
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
</dependency>
public static void doGet(){
// 创建Httpclient对象
CloseableHttpClient httpclient = HttpClients.createDefault(); // 创建http GET请求
HttpGet httpGet = new HttpGet("http://www.oschina.net/"); CloseableHttpResponse response = null;
try {
// 执行请求
response = httpclient.execute(httpGet);
System.out.println(response.getStatusLine());
// 判断返回状态是否为200
if (response.getStatusLine().getStatusCode() == 200) {
String content = EntityUtils.toString(response.getEntity(), "UTF-8");
System.out.println("内容长度:" + content.length());
}
}catch(Exception e){
e.printStackTrace(); } finally {
if (response != null) {
try {
response.close();
} catch (IOException e) {
e.printStackTrace();
}
}
try {
httpclient.close();
} catch (IOException e) {
e.printStackTrace();
}
}
public static void doGetParam(){
// 创建Httpclient对象
CloseableHttpClient httpclient = HttpClients.createDefault();
CloseableHttpResponse response = null;
try { // 定义请求的参数
URI uri = new URIBuilder("http://www.baidu.com/s").setParameter("wd", "数据库").build(); System.out.println(uri); // 创建http GET请求
HttpGet httpGet = new HttpGet(uri); // 执行请求
response = httpclient.execute(httpGet);
// 判断返回状态是否为200
if (response.getStatusLine().getStatusCode() == 200) {
String content = EntityUtils.toString(response.getEntity(), "UTF-8");
System.out.println(content);
}
}catch(Exception e){
e.printStackTrace(); }finally {
if (response != null) {
try {
response.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
try {
httpclient.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
public static void doPost(){
// 创建Httpclient对象
CloseableHttpClient httpclient = HttpClientBuilder.create().setRedirectStrategy(new LaxRedirectStrategy()).build(); // 创建http POST请求
HttpPost httpPost = new HttpPost("http://www.oschina.net/"); CloseableHttpResponse response = null;
try {
// 执行请求
response = httpclient.execute(httpPost);
System.out.println(response.getStatusLine());
// 判断返回状态是否为200
if (response.getStatusLine().getStatusCode() == 200) {
String content = EntityUtils.toString(response.getEntity(), "UTF-8");
System.out.println(content);
}
}catch(Exception e){
e.printStackTrace(); }finally {
if (response != null) {
try {
response.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
try {
httpclient.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
public static void doPostParam() throws Exception{
// 创建Httpclient对象
CloseableHttpClient httpclient = HttpClientBuilder.create().setRedirectStrategy(new LaxRedirectStrategy()).build(); // 创建http POST请求
HttpPost httpPost = new HttpPost("http://www.oschina.net/search"); // 设置2个post参数,一个是scope、一个是q
List<NameValuePair> parameters = new ArrayList<NameValuePair>();
parameters.add(new BasicNameValuePair("scope", "project"));
parameters.add(new BasicNameValuePair("q", "java"));
// 构造一个form表单式的实体
UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(parameters);
// 将请求实体设置到httpPost对象中
httpPost.setEntity(formEntity); CloseableHttpResponse response = null;
try {
// 执行请求
response = httpclient.execute(httpPost);
System.out.println(response.getStatusLine());
// 判断返回状态是否为200
if (response.getStatusLine().getStatusCode() == 200) {
String content = EntityUtils.toString(response.getEntity(), "UTF-8");
System.out.println(content);
}
} finally {
if (response != null) {
response.close();
}
httpclient.close();
}
}
obj.addHeader("Content-Type","application/x-www-form-urlencoded; charset=UTF-8");
obj.addHeader("User-Agent"," Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537. 36 (KHTML, like Gecko) Chrome/31.0.1650.63")
package org.chu.ego.base.utils; import java.io.IOException;
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.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.client.utils.URIBuilder;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.impl.client.LaxRedirectStrategy;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
/**
* --发送get请求的api
* CloseableHttpClient类 ,client实现类
* HttpClients类 ,client工具类,用于创建客户端对象。
* CloseableHttpResponse接口,请求的响应对象
* URIBuilder类 :url构建类,用于设置get请求的路径变量
* HttpGet类 :get请求的发送对象
* EntityUtils类 实体处理类
*
* --发送post 请求使用的api
* CloseableHttpClient类
* HttpClientBuilder client构建对象,用于创建客户端对象。
* LaxRedirectStrategy类,post请求重定向的策略
* CloseableHttpResponse 请求的响应对象
* HttpPost post请求的发送对象
* NameValuePair 类,用于设置参数值
* UrlEncodedFormEntity:用于设置表单参数给发送对象HttpPost
*
* @author ranger
*
*/
public class HttpClientUtils { public static String doGet(String url,Map<String, String> params){ //获取httpclient客户端
CloseableHttpClient httpclient = HttpClients.createDefault(); String resultString = ""; CloseableHttpResponse response = null; try {
URIBuilder builder = new URIBuilder(url); if(null!=params){
for (String key:params.keySet()) {
builder.setParameter(key, params.get(key));
}
} HttpGet get = new HttpGet(builder.build()); response = httpclient.execute(get); System.out.println(response.getStatusLine()); if(200==response.getStatusLine().getStatusCode()){
HttpEntity entity = response.getEntity();
resultString = EntityUtils.toString(entity, "utf-8");
} } catch (Exception e) { e.printStackTrace();
} finally {
if(null!=response){
try {
response.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if(null!=httpclient){
try {
httpclient.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
} return resultString;
} public static String doGet(String url){
return doGet(url, null);
} public static String doPost(String url,Map<String,String> params){
/**
* 在4.0及以上httpclient版本中,post需要指定重定向的策略,如果不指定则按默认的重定向策略。
*
* 获取httpclient客户端
*/
CloseableHttpClient httpclient = HttpClientBuilder.create().setRedirectStrategy( new LaxRedirectStrategy()).build(); String resultString = ""; CloseableHttpResponse response = null; try { HttpPost post = new HttpPost(url); List<NameValuePair> paramaters = new ArrayList<>(); if(null!=params){
for (String key : params.keySet()) {
paramaters.add(new BasicNameValuePair(key,params.get(key)));
} UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity (paramaters); post.setEntity(formEntity);
} /**
* HTTP/1.1 403 Forbidden
* 原因:
* 有些网站,设置了反爬虫机制
* 解决的办法:
* 设置请求头,伪装浏览器
*/
post.addHeader("user-agent", "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.132 Safari/537.36"); response = httpclient.execute(post); System.out.println(response.getStatusLine()); if(200==response.getStatusLine().getStatusCode()){
HttpEntity entity = response.getEntity();
resultString = EntityUtils.toString(entity, "utf-8");
} } catch (Exception e) { e.printStackTrace();
} finally {
if(null!=response){
try {
response.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if(null!=httpclient){
try {
httpclient.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
} return resultString;
} public static String doPost(String url){
return doPost(url, null);
} }
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