HttpClient模拟postman/浏览器（登录+访问接口）详解编程语言

创建HttpClient实例时应用了单例模式（饿汉式）

package com.jake.autotest.util; 

import com.jake.autotest.constant.BpmUatConstants; 

import org.apache.commons.lang3.StringUtils; 

import org.apache.http.*; 

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.HttpClients; 

import org.apache.http.message.BasicNameValuePair; 

import org.apache.http.util.EntityUtils; 

import java.io.IOException; 

import java.util.ArrayList; 

public class HttpClientUtils {


 HttpPost loginPost = new HttpPost(BpmUatConstants.LOGIN_URL); 

 ArrayList NameValuePair loginPairs = new ArrayList (); 

 loginPairs.add(new BasicNameValuePair("username", BpmUatConstants.USERNAME)); 

 loginPairs.add(new BasicNameValuePair("password", BpmUatConstants.PASSWORD)); 

 try {

 loginPost.setEntity(new UrlEncodedFormEntity(loginPairs, "utf-8")); 

 client.execute(loginPost); 

 } catch (IOException e) {

 e.printStackTrace(); 

 /** 

 * 以Get请求方式访问需要事先登录的HTTP接口 

 * @param url HTTP接口的URL 

 * @param paramStr 请求参数的字符串形式："param1=xxx param2=yyy param3=zzz" 

 * @return 访问HTTP接口得到的Json数据 

 public static String visitByGet(String url, String paramStr) {

 String json = null; 

 try {

 URIBuilder uriBuilder = new URIBuilder(url); 

 if (StringUtils.isNotEmpty(paramStr)) {

 ArrayList NameValuePair paramPairs = getNameValuePairs(paramStr); 

 uriBuilder.setParameters(paramPairs); 

 HttpGet visitGet = new HttpGet(uriBuilder.build()); 

 CloseableHttpResponse visitResponse = client.execute(visitGet); 

 json = EntityUtils.toString(visitResponse.getEntity()); 

 } catch (Exception e) {

 e.printStackTrace(); 

 return json; 

 /** 

 * 以Post请求方式访问需要事先登录的HTTP接口 

 * @param url HTTP接口的URL 

 * @param paramStr 请求参数的字符串形式："param1=xxx param2=yyy param3=zzz" 

 * @return 访问HTTP接口得到的Json数据 

 public static String visitByPost(String url, String paramStr) {

 String json = null; 

 try {

 HttpPost visitPost = new HttpPost(url); 

 if (StringUtils.isNotEmpty(paramStr)) {

 ArrayList NameValuePair paramPairs = getNameValuePairs(paramStr); 

 visitPost.setEntity(new UrlEncodedFormEntity(paramPairs, "utf-8")); 

 HttpResponse visitResponse = client.execute(visitPost); 

 json = EntityUtils.toString(visitResponse.getEntity()); 

 } catch (Exception e) {

 e.printStackTrace(); 

 return json; 

 /** 

 * 1. 把传入参数"param1=xxx param2=yyy param3=zzz"以 为分离点拆分为params数组，其中 

 * params[0]="param1=xxx", params[1]="param2=yyy", param[2]="param3=zzz" 

 * 2. 由1可以看出，params数组的每一个元素都是name-value对的字符串形式，以=为分离点将该数组 

 * 拆分为一个长度为2的数组nv(name-value)，其中，nv[0], nv[1]分别对应BasicNameValuePair 

 * 构造方法的第一、二个参数。 

 * @param paramStr 请求参数的字符串形式："param1=xxx param2=yyy param3=zzz" 

 * @return HttpClient执行HttpPost或HttpGet请求所需的NameValuePair对象集合 

 private static ArrayList NameValuePair getNameValuePairs(String paramStr) {

 ArrayList NameValuePair paramPairs = new ArrayList (); 

 String[] params = paramStr.split(" "); 

 for (String param: params) {

 String[] nv = param.split("="); 

 if (nv.length == 2) {

 paramPairs.add(new BasicNameValuePair(nv[0], nv[1])); 

 return paramPairs; 

原创文章，作者：ItWorker，如若转载，请注明出处：https://blog.ytso.com/19601.html