http請求
1.坐標依賴
<!--HttpClient-->
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpcore</artifactId>
<version>4.4.10</version>
</dependency>
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.5.6</version>
</dependency>
2.分析
在日常開發中，我們可能會去對接一些第三方的接口，亦或者是在一個項目中對接另外一個項目.這樣類似的情況都會牽涉到數據交互的問題,所以我們就可以模擬用戶在瀏覽器上的行為發送Http請求來完成數據的交互
3.A項目發送請求
package lp.elliot.controller;
import com.alibaba.fastjson.JSON;
import lp.elliot.pojo.ElliotResponse;
import lp.elliot.pojo.Info;
import org.apache.http.HttpEntity;
import org.apache.http.HttpStatus;
import org.apache.http.StatusLine;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import java.io.IOException;
import java.net.URISyntaxException;
/**
* @Author：Elliot
* @Email：elliot_mr@126.com
* @Date:2019/3/20 22:59
* @Description：
* @Version 1.011
*/
@Controller
@RequestMapping("/http")
public class HttpController {
@RequestMapping("/send")
@ResponseBody
public ElliotResponse sendInfo(@RequestBody Info info) throws IOException, URISyntaxException {
System.out.println(info);
//httpClient對象
CloseableHttpClient httpclient = HttpClients.createDefault();
//post對象
HttpPost httpPost = new HttpPost("http://10.9.1.55:8090/http/send2");
//請求體格式
httpPost.setHeader("Accept", "application/json");
httpPost.setHeader("Content-Type", "application/json");
httpPost.setHeader("token","lpck");
String charSet = "UTF-8";
Info newInfo = new Info();
newInfo.setOne(info.getOne());
newInfo.setTwo(info.getTwo());
newInfo.setThree(info.getThree());
//請求參數JSON序列化
String jsonInfo = JSON.toJSONString(newInfo);
StringEntity entity = new StringEntity(jsonInfo, charSet);
httpPost.setEntity(entity);
CloseableHttpResponse response = null;
try {
response = httpclient.execute(httpPost);
StatusLine status = response.getStatusLine();
int state = status.getStatusCode();
//響應狀態碼為200
if (state == HttpStatus.SC_OK) {
HttpEntity responseEntity = response.getEntity();
String jsonString = EntityUtils.toString(responseEntity);
System.out.println(jsonString);
return ElliotResponse.ok(200,jsonString);
}
else{
return ElliotResponse.ok(500,"請求失敗!");
}
}
//資源釋放
finally {
if (response != null) {
try {
response.close();
} catch (IOException e) {
e.printStackTrace();
}
}
try {
httpclient.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
關于Header中的Token
這里的自定義token的目的在于對接的時候作為一個密鑰校驗 如果token校驗成功再進行下一步的請求處理.校驗失敗則直接拒絕。
A項目的簡易頁面
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script src="../../static/res/js/jquery-3.3.1.min.js"></script>
</head>
<body>
<h1>Hello Spring Boot Sever! LOCALHOST - ELLIOT</h1>
<p id="one">段落one</p>
<p id="two">段落two</p>
<p id="three">段落three</p>
<input type="button" value="提交數據到另一個項目" id="submit">
</body>
<script type="text/javascript">
$("#submit").click(function () {
var one = $("#one").text();
var two = $("#two").text();
var three = $("#three").text();
$.ajax({
type:'POST',
url:'/http/send',
contentType: "application/json;charset=UTF-8",
data:JSON.stringify({
"one":one,
"two":two,
"three":three
}),
dataType:'json',
timeout:5000,
success:function (response) {
if (response.msg.code == 200){
window.confirm("success!");
}
if (response.msg.code == 500){
window.confirm("token校驗失敗!");
}
}
})
})
</script>
</html>
4.B項目接收請求并交互
import cn.lpck.xdfds.pojo.BaseResponse;
import cn.lpck.xdfds.pojo.Info;
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.HttpPost;
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 org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.LinkedList;
/**
* @Author：Elliot
* @Email：elliot_mr@126.com
* @Date:2019/3/20 17:26
* @Description：
* @Version 1.011
*/
@RestController
@RequestMapping("/http")
public class HttpController {
@RequestMapping("/send2")
public BaseResponse sendInfo(@RequestBody Info info, HttpServletRequest request) throws IOException {
System.out.println(info);
String utoken = request.getHeader("token");
System.out.println(utoken);
if ("lpck".equals(utoken)){
return BaseResponse.ok(200,"Success");
}else {
return BaseResponse.ok(500,"Token錯誤!");
}
}
}
因為這里只是寫了一個簡易的Demo所以在接收到請求之后并沒有進行下一步的處理，但是麻雀雖小五臟俱全，交互的邏輯才是需要掌握的核心思想。
本人才疏學淺，如果有什么不對的地方歡迎各位指出，我們可以相互學習.
