使用HttpClient调用接口的实例讲解

一，编写返回对象

public class httpresult {
// 响应的状态码
private int code;

// 响应的响应体
private string body;
get/set…
}

二，封装httpclient

package cn.xxxxxx.httpclient;

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.httpdelete;
import org.apache.http.client.methods.httpget;
import org.apache.http.client.methods.httppost;
import org.apache.http.client.methods.httpput;
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;

public class apiservice {

 private closeablehttpclient httpclient;

 public apiservice() {
  // 1 创建httpclinet，相当于打开浏览器
  this.httpclient = httpclients.createdefault();
 }

 /**
  * 带参数的get请求
  * 
  * @param url
  * @param map
  * @return
  * @throws exception
  */
 public httpresult doget(string url, map<string, object> map) throws exception {

  // 声明uribuilder
  uribuilder uribuilder = new uribuilder(url);

  // 判断参数map是否为非空
  if (map != null) {
   // 遍历参数
   for (map.entry<string, object> entry : map.entryset()) {
    // 设置参数
    uribuilder.setparameter(entry.getkey(), entry.getvalue().tostring());
   }
  }

  // 2 创建httpget对象，相当于设置url请求地址
  httpget httpget = new httpget(uribuilder.build());

  // 3 使用httpclient执行httpget，相当于按回车，发起请求
  closeablehttpresponse response = this.httpclient.execute(httpget);

  // 4 解析结果，封装返回对象httpresult，相当于显示相应的结果
  // 状态码
  // response.getstatusline().getstatuscode();
  // 响应体，字符串，如果response.getentity()为空，下面这个代码会报错,所以解析之前要做非空的判断
  // entityutils.tostring(response.getentity(), "utf-8");
  httpresult httpresult = null;
  // 解析数据封装httpresult
  if (response.getentity() != null) {
   httpresult = new httpresult(response.getstatusline().getstatuscode(),
     entityutils.tostring(response.getentity(), "utf-8"));
  } else {
   httpresult = new httpresult(response.getstatusline().getstatuscode(), "");
  }

  // 返回
  return httpresult;
 }

 /**
  * 不带参数的get请求
  * 
  * @param url
  * @return
  * @throws exception
  */
 public httpresult doget(string url) throws exception {
  httpresult httpresult = this.doget(url, null);
  return httpresult;
 }

 /**
  * 带参数的post请求
  * 
  * @param url
  * @param map
  * @return
  * @throws exception
  */
 public httpresult dopost(string url, map<string, object> map) throws exception {
  // 声明httppost请求
  httppost httppost = new httppost(url);

  // 判断map不为空
  if (map != null) {
   // 声明存放参数的list集合
   list<namevaluepair> params = new arraylist<namevaluepair>();

   // 遍历map，设置参数到list中
   for (map.entry<string, object> entry : map.entryset()) {
    params.add(new basicnamevaluepair(entry.getkey(), entry.getvalue().tostring()));
   }

   // 创建form表单对象
   urlencodedformentity formentity = new urlencodedformentity(params, "utf-8");

   // 把表单对象设置到httppost中
   httppost.setentity(formentity);
  }

  // 使用httpclient发起请求，返回response
  closeablehttpresponse response = this.httpclient.execute(httppost);

  // 解析response封装返回对象httpresult
  httpresult httpresult = null;
  if (response.getentity() != null) {
   httpresult = new httpresult(response.getstatusline().getstatuscode(),
     entityutils.tostring(response.getentity(), "utf-8"));
  } else {
   httpresult = new httpresult(response.getstatusline().getstatuscode(), "");
  }

  // 返回结果
  return httpresult;
 }

 /**
  * 不带参数的post请求
  * 
  * @param url
  * @return
  * @throws exception
  */
 public httpresult dopost(string url) throws exception {
  httpresult httpresult = this.dopost(url, null);
  return httpresult;
 }

 /**
  * 带参数的put请求
  * 
  * @param url
  * @param map
  * @return
  * @throws exception
  */
 public httpresult doput(string url, map<string, object> map) throws exception {
  // 声明httppost请求
  httpput httpput = new httpput(url);

  // 判断map不为空
  if (map != null) {
   // 声明存放参数的list集合
   list<namevaluepair> params = new arraylist<namevaluepair>();

   // 遍历map，设置参数到list中
   for (map.entry<string, object> entry : map.entryset()) {
    params.add(new basicnamevaluepair(entry.getkey(), entry.getvalue().tostring()));
   }

   // 创建form表单对象
   urlencodedformentity formentity = new urlencodedformentity(params, "utf-8");

   // 把表单对象设置到httppost中
   httpput.setentity(formentity);
  }

  // 使用httpclient发起请求，返回response
  closeablehttpresponse response = this.httpclient.execute(httpput);

  // 解析response封装返回对象httpresult
  httpresult httpresult = null;
  if (response.getentity() != null) {
   httpresult = new httpresult(response.getstatusline().getstatuscode(),
     entityutils.tostring(response.getentity(), "utf-8"));
  } else {
   httpresult = new httpresult(response.getstatusline().getstatuscode(), "");
  }

  // 返回结果
  return httpresult;
 }

 /**
  * 带参数的delete请求
  * 
  * @param url
  * @param map
  * @return
  * @throws exception
  */
 public httpresult dodelete(string url, map<string, object> map) throws exception {

  // 声明uribuilder
  uribuilder uribuilder = new uribuilder(url);

  // 判断参数map是否为非空
  if (map != null) {
   // 遍历参数
   for (map.entry<string, object> entry : map.entryset()) {
    // 设置参数
    uribuilder.setparameter(entry.getkey(), entry.getvalue().tostring());
   }
  }

  // 2 创建httpget对象，相当于设置url请求地址
  httpdelete httpdelete = new httpdelete(uribuilder.build());

  // 3 使用httpclient执行httpget，相当于按回车，发起请求
  closeablehttpresponse response = this.httpclient.execute(httpdelete);

  // 4 解析结果，封装返回对象httpresult，相当于显示相应的结果
  // 状态码
  // response.getstatusline().getstatuscode();
  // 响应体，字符串，如果response.getentity()为空，下面这个代码会报错,所以解析之前要做非空的判断
  // entityutils.tostring(response.getentity(), "utf-8");
  httpresult httpresult = null;
  // 解析数据封装httpresult
  if (response.getentity() != null) {
   httpresult = new httpresult(response.getstatusline().getstatuscode(),
     entityutils.tostring(response.getentity(), "utf-8"));
  } else {
   httpresult = new httpresult(response.getstatusline().getstatuscode(), "");
  }

  // 返回
  return httpresult;
 }

}

三，调用接口

package cn.xxxxxx.httpclient.test;

import java.util.hashmap;
import java.util.map;

import org.junit.before;
import org.junit.test;

import cn.itcast.httpclient.apiservice;
import cn.itcast.httpclient.httpresult;

public class apiservicetest {

 private apiservice apiservice;

 @before
 public void init() {
  this.apiservice = new apiservice();
 }

 // 查询
 @test
 public void testqueryitembyid() throws exception {
  // http://manager.aaaaaa.com/rest/item/interface/{id}

  string url = "http://manager.aaaaaa.com/rest/item/interface/42";

  httpresult httpresult = this.apiservice.doget(url);

  system.out.println(httpresult.getcode());
  system.out.println(httpresult.getbody());

 }

 // 新增
 @test
 public void testsaveitem() throws exception {
  // http://manager.aaaaaa.com/rest/item/interface/{id}

  string url = "http://manager.aaaaaa.com/rest/item/interface";

  map<string, object> map = new hashmap<string, object>();
  // title=测试restful风格的接口&price=1000&num=1&cid=888&status=1
  map.put("title", "测试apiservice调用新增接口");
  map.put("price", "1000");
  map.put("num", "1");
  map.put("cid", "666");
  map.put("status", "1");

  httpresult httpresult = this.apiservice.dopost(url, map);

  system.out.println(httpresult.getcode());
  system.out.println(httpresult.getbody());

 }

 // 修改

 @test
 public void testupdateitem() throws exception {
  // http://manager.aaaaaa.com/rest/item/interface/{id}

  string url = "http://manager.aaaaaa.com/rest/item/interface";

  map<string, object> map = new hashmap<string, object>();
  // title=测试restful风格的接口&price=1000&num=1&cid=888&status=1
  map.put("title", "测试apiservice调用修改接口");
  map.put("id", "44");

  httpresult httpresult = this.apiservice.doput(url, map);

  system.out.println(httpresult.getcode());
  system.out.println(httpresult.getbody());

 }

 // 删除
 @test
 public void testdeleteitembyid() throws exception {
  // http://manager.aaaaaa.com/rest/item/interface/{id}

  string url = "http://manager.aaaaaa.com/rest/item/interface/44";

  httpresult httpresult = this.apiservice.dodelete(url, null);

  system.out.println(httpresult.getcode());
  system.out.println(httpresult.getbody());

 }

}

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