簡單介紹HttpClient調用接口的使用

進都進來了點個贊再走唄！
你總說總有一天我要幹嘛幹嘛，說的好像那天真會來一樣。

簡單介紹HttpClient調用接口的使用

第一步：定義HttpClientUtils類，配置連接時間和讀取時間限制

public class HttpClientUtils(){
 // 設置連接超時時間
 private int connectTime = 5000;
 public int getConnectTime() {
  return connectTime;
 }
 public void setConnectTime(int connectTime) {
  this.connectTime = connectTime;
 }
 // 設置讀取超時時間
 private int readTime = 1000;
 public int getReadTime() {
  return readTime;
 }
 public void setReadTime(int readTime) {
  this.readTime = readTime;
 }
 /**
  * 創建 HTTP client
  * @return 實例
  */
 public HttpClient createHttpClient() {
  HttpClient client = new HttpClient();
  client.getHttpConnectionManager().getParams()
    .setConnectionTimeout(connectTime);
  client.getHttpConnectionManager().getParams().setSoTimeout(readTime);
  return client;
 }
 }

第二部：我們定義一個調用接口所需要傳的參數類，這邊我就以學生類來舉個例子

public class Stu {
 //主鍵id
 private  String id;
 //學號
 private String code;
 //姓名
 private String name;
 //年齡
 private int age;
 //年級
 private String grade;
 public String getId() {
  return id;
 }
 public String getCode() {
  return code;
 }
 public String getName() {
  return name;
 }
 public int getAge() {
  return age;
 }
 public String getGrade() {
  return grade;
 }
 public void setId(String id) {
  this.id = id;
 }
 public void setCode(String code) {
  this.code = code;
 }
 public void setName(String name) {
  this.name = name;
 }
 public void setAge(int age) {
  this.age = age;
 }
 public void setGrade(String grade) {
  this.grade = grade;
 }
 public String toStringStu() {
  return "id=" + id + "&code=" + code + "&name=" + name + "&age=" + age + "&grade=" + grade;
 }
 }

第三部：我們來寫一下實際調用情況，在此我就當在controller層作調用，實際我們可以將調用寫在service服務層，實際調用可分爲以下兩種情況：
1.當調用接口所傳參數爲對象時，如下圖(此處爲你所要調用的接口案例，即代碼塊中url，別弄錯啦！)：
下面上代碼塊：

這裏時@Qualifier易懂例子 https://blog.csdn.net/zhizhuodewo6/article/details/81365695

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.methods.PostMethod;
import org.apache.commons.httpclient.methods.StringRequestEntity;
import org.apache.commons.httpclient.params.HttpMethodParams;
import org.apache.commons.lang.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import com.ibm.CORBA.iiop.Request;
import com.techown.aia.ccc.service.impl.CccServiceImpl;
import com.techown.aia.utils.HttpUtils;
import net.sf.json.JSONObject;
public class StuController {
 protected Logger logger = LoggerFactory.getLogger(StuController.class);
 @Autowired
 @Qualifier("httpUtils")    //若多個接口調用，保證其唯一性
 private HttpClientUtils httpUtils;
 public HttpClientUtils getHttpUtils() {
  return httpUtils;
 }
 public void setHttpUtils(HttpClientUtils httpUtils) {
  this.httpUtils = httpUtils;
 }
 @RequestMapping("/stuHttpCliet1")
 @ResponseBody
 public String stuClient(Stu stu){
  List<Stu> stulist=new ArrayList<Stu>();
  Map<String, List<Stu>> map=new HashMap<String, List<Stu>>();
  //這裏寫死數據,實際以前端傳值爲主
  stu.setId("1");
  stu.setCode("1001");
  stu.setName("張三");
  stu.setAge(20);
  stu.setGrade("大一");
  stulist.add(stu);
  map.put("list",stulist);
  String request=StringUtils.strip(map.get("list").toString(),"[]");
  HttpClient client=httpUtils.createHttpClient();
  String response="";
  //若調用接口類似於此類url
  String url="http://localhost:9080/stuClient";
  try {
   PostMethod post=new PostMethod(url);
   post.setRequestEntity(new StringRequestEntity(request, "text/html", "UTF-8"));
   post.setRequestHeader("content-type", "text/html");
   HttpMethodParams params = post.getParams();
   params.setContentCharset("UTF-8");
   int status=client.executeMethod(post);
   //status爲200時，調用成功
   if (status == HttpStatus.SC_OK) {
    response = post.getResponseBodyAsString();
    JSONObject jsonObject=JSONObject.fromObject(response);
    System.out.print(jsonObject);
   }
  } catch (Exception e) {
   logger.error("error {}",e.getMessage());
  }
  return null;
 }
 }

2.當調用接口所傳參數爲攜帶參數時，如下圖(此處爲你所要調用的接口案例，即代碼塊中url，別弄錯啦！)：

下面上代碼塊（放同一Controller類中）:

@RequestMapping("/stuHttpCliet2")
 @ResponseBody
 public String stuClientp(Stu stup) throws UnsupportedEncodingException{
  //這裏寫死數據,實際以前端傳值爲主
  stup.setId("1");
  stup.setCode("1001");
  stup.setName("張三");
  stup.setAge(20);
  stup.setGrade("大一");
  HttpClient client=httpUtils.createHttpClient();
  String response="";
  //若調用接口類似於此類url 
  String url="http://localhost:9080/stuClient?id=&code=&name=&age=&grade=";
  String url2="http://localhost:9080/stuClient";
  String requestParam=stup.toStringStu();
  //此處爲正常調用
  //String request=url2+"?"+requestParam;
  //此處所傳五個參數中不能有空格， 類似於這種   code='YY   NN  '或name='張三',
  //否則要對參數進行編碼，即URLEncoder.encode(code,'UTF-8')或URLEncoder.encode(name,'UTF-8')，對上面寫死參數以下寫法
  String request=url2+"?"+"id="+stup.getId()+"&code="+stup.getCode()+"&name="+URLEncoder.encode(stup.getName(),"UTF-8")
   +"&age="+stup.getAge()+"&grade="+URLEncoder.encode(stup.getGrade(), "UTF-8");
  try {
   PostMethod post=new PostMethod(url2);
   post.setRequestEntity(new StringRequestEntity(request, "text/html", "UTF-8"));
   post.setRequestHeader("content-type", "text/html");
   HttpMethodParams params = post.getParams();
   params.setContentCharset("UTF-8");
   int status=client.executeMethod(post);
    //status爲200時，調用成功
   if (status == HttpStatus.SC_OK) {
    response = post.getResponseBodyAsString();
    JSONObject jsonObject=JSONObject.fromObject(response);
    System.out.print(jsonObject);
   }
  } catch (Exception e) {
   logger.error("error {}",e.getMessage());
  }
  return null;
 }

整理不易，希望對進來的小夥伴們有幫助哈！
臨走再送一句毒雞湯給你們，努力不一定成功，但不努力一定很輕鬆。