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HttpClient调用_状态码


文章目录


一、HttpClient调用

1、get不带参数调用

package com.xiaoqi.httpclient;

import org.apache.http.HttpEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.utils.URIBuilder;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import org.junit.Test;

public class HttpClientTest {

@Test
public void doGet() throws Exception{//不带参数的http请求
//创建一个httpclient对象
CloseableHttpClient http = HttpClients.createDefault();
//创建一个Get对象
HttpGet get = new HttpGet("http://www.baidu.com");
//执行httpclient调用
CloseableHttpResponse response = http.execute(get);
//获取状态码
int code = response.getStatusLine().getStatusCode();
System.out.println("状态:"+ code);
//获取内容
HttpEntity entity = response.getEntity();
String string = EntityUtils.toString(entity,"utf-8");
System.out.println("获取的内容:"+ string);
//关闭httpclient
response.close();
}

2、get带参数调用

@Test
public void doGetWith() throws Exception{//带参数的http请求
//创建一个httpclient对象
CloseableHttpClient http = HttpClients.createDefault();
//创建一个URI对象并传入地址
URIBuilder uri= new URIBuilder("https://www.baidu.com/s");
//给URI对象添加参数
uri.addParameter("wd", "程序员");
//创建一个http对象并传入URI对象
HttpGet httpGet = new HttpGet(uri.build());
//执行http请求
CloseableHttpResponse response = http.execute(httpGet);
//获取状态码
int code = response.getStatusLine().getStatusCode();
System.out.println("状态码:"+code);
//获取返回值
HttpEntity entity = response.getEntity();
String string = EntityUtils.toString(entity);
System.out.println("返回值:"+string);
}
}

3、post不带参数调用

@Test
public void doPost() throws Exception{
//创建一个httpclient对象
CloseableHttpClient http = HttpClients.createDefault();
//创建一个httppost对象
HttpPost post = new HttpPost("http://localhost:8082/httpclient/post.html");
//执行httpclient请求
CloseableHttpResponse response = http.execute(post);
//获取返回状态码
int code = response.getStatusLine().getStatusCode();
System.out.println("状态码:"+code);
//获取返回值
String string = EntityUtils.toString(response.getEntity());
System.out.println("返回值:"+string);
}

4、post带参数调用

@Test
public void postWith() throws Exception{//post请求带参数
//创建一个httpclient对象
CloseableHttpClient http = HttpClients.createDefault();
//创建一个httppost对象
HttpPost post = new HttpPost("http://localhost:8082/httpclient/post2.html");
//创建一个post表单
List<NameValuePair> list = new ArrayList<NameValuePair>();
//存放参数
list.add(new BasicNameValuePair("name", "张三"));
list.add(new BasicNameValuePair("password", "123"));

//包装一个entity对象
StringEntity entity = new UrlEncodedFormEntity(list);
//将参数放入post请求中
post.setEntity(entity);
//执行http请求
CloseableHttpResponse response = http.execute(post);
//获取状态码
int code = response.getStatusLine().getStatusCode();
System.out.println("状态码:"+code);
//获取返回值
String string = EntityUtils.toString(response.getEntity());
System.out.println("返回值:"+string);
}

二、HttpClient调用工具类

package com.taotao.common.utils;

import java.io.IOException;

import java.net.URI;

import java.util.ArrayList;

import java.util.List;

import java.util.Map;

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.entity.ContentType;

import org.apache.http.entity.StringEntity;

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 {

public static String doGet(String url, Map<String, String> param) {

// 创建Httpclient对象

CloseableHttpClient httpclient = HttpClients.createDefault();

String resultString = "";

CloseableHttpResponse response = null;

try {

// 创建uri

URIBuilder builder = new URIBuilder(url);

if (param != null) {

for (String key : param.keySet()) {

builder.addParameter(key, param.get(key));

}

}

URI uri = builder.build();

// 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) {

resultString = EntityUtils.toString(response.getEntity(), "UTF-8");

}

} catch (Exception e) {

e.printStackTrace();

} finally {

try {

if (response != null) {

response.close();

}

httpclient.close();

} catch (IOException e) {

e.printStackTrace();

}

}

return resultString;

}

public static String doGet(String url) {

return doGet(url, null);

}

public static String doPost(String url, Map<String, String> param) {

// 创建Httpclient对象

CloseableHttpClient httpClient = HttpClients.createDefault();

CloseableHttpResponse response = null;

String resultString = "";

try {

// 创建Http Post请求

HttpPost httpPost = new HttpPost(url);

// 创建参数列表

if (param != null) {

List<NameValuePair> paramList = new ArrayList<>();

for (String key : param.keySet()) {

paramList.add(new BasicNameValuePair(key, param.get(key)));

}

// 模拟表单

UrlEncodedFormEntity entity = new UrlEncodedFormEntity(paramList);

httpPost.setEntity(entity);

}

// 执行http请求

response = httpClient.execute(httpPost);

resultString = EntityUtils.toString(response.getEntity(), "utf-8");

} catch (Exception e) {

e.printStackTrace();

} finally {

try {

response.close();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

return resultString;

}

public static String doPost(String url) {

return doPost(url, null);

}

public static String doPostJson(String url, String json) {

// 创建Httpclient对象

CloseableHttpClient httpClient = HttpClients.createDefault();

CloseableHttpResponse response = null;

String resultString = "";

try {

// 创建Http Post请求

HttpPost httpPost = new HttpPost(url);

// 创建请求内容

StringEntity entity = new StringEntity(json, ContentType.APPLICATION_JSON);

httpPost.setEntity(entity);

// 执行http请求

response = httpClient.execute(httpPost);

resultString = EntityUtils.toString(response.getEntity(), "utf-8");

} catch (Exception e) {

e.printStackTrace();

} finally {

try {

response.close();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

return resultString;

}

}

三、总结

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