构造HTTP请求方式
我们通过对HTTP请求协议报头格式的学习知道了,我们可以通过3种基本方式去构造HTTP请求!
而请求是在客户端构造的也就是属于前端的工作!
所以这3种构造请求的方式,大部分是通过前端代码来实现的,不过我们也可以通过java代码基于socket来实现!
基于
HTML/JS实现构造!
- 基于
form表单 - 基于
ajax
基于
java代码实现构造!
- 基于
socket
form表单
HTML中的form表单就可以构造HTTP请求!
我们通过下面代码进行学习!
<!--form表单的形式构造http请求-->
<form action="https://www.csdn.net/" method="get"> <!--action 存放需要请求要提交的服务器url,method请求提交的的方法! -->
<input type="text" name="name"> <!--这里通过input标签实现-->
<input type="password" name="password"> <!--这里的name是一个特殊的属性,这是的name保存了键值对中的key,专门用于http构造请求的!-->
<input type="submit"> <!--提交按钮-->
</form>
表单标签- <
form></form>
这个标签允许用户输入一些信息提交到服务器中!
其中里面可以存放用户交互的组件
描述了要把数据按照什么方式, 提交到哪个页面中.
所以我们通过form表单标签就可以编写一个http请求!
<form action="https://www.csdn.net/" method="get">
这里通过键值对的形式 keyaction保存的值是我们需要请求服务器的url
method保存我们通过那种方法进行请求
这里的方法只能是post和get
我们知道post请求中要传输的数据保存在body中
get方法请求要传输的数据保证在url中的querystring查询字符串中!
这里我们通过get方法进行构造,也就是说等下会通过querystring等方式给服务器传输数据!
inpt标签
我们知道form标签中的组件就可以用于客户端和服务器进行交互!
我们通过input标签!
type属性,这个属性的取值代表这个input具有不同含义!
type=text
这是一个普通文本框!
type=password
这是一个用于提交密码的文本框(输入内容不可见)
type=submit
提交表单按钮,我们最终要将我们构造的http请求提交到服务器上!
<input type="text" name="name">
<input type="password" name="password">
这里的name属性保存的就是querystring查询字符串中键值对中的key!
我们在输入框中输入的数据就对应了该name属性下的value值我们提交后就会在查询字符串中保存!
我们向服务器提交表单后,就构造了一个get方法的http请求!
我们发现我们已经跳转到了CSDN的网站上!
因为我们提交的服务器url就是C站的首页!
我们通过fiddler抓包,看我们构造的请求和服务器给我们返回的响应是怎样的!
请求
GET https://www.csdn.net/?name=bug%E9%83%AD&password=666666 HTTP/1.1
Host: www.csdn.net
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:101.0) Gecko/20100101 Firefox/101.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8
Accept-Language: zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2
Accept-Encoding: gzip, deflate, br
Connection: keep-alive
Cookie: uuid_tt_dd=10_30601611580-1653459529558-297725; log_Id_pv=846; Hm_lvt_6bcd52f51e9b3dce32bec4a3997715ac=1655356530,1655382747,1655518119,1655547417; Hm_up_6bcd52f51e9b3dce32bec4a3997715ac=%7B%22islogin%22%3A%7B%22value%22%3A%221%22%2C%22scope%22%3A1%7D%2C%22isonline%22%3A%7B%22value%22%3A%221%22%2C%22scope%22%3A1%7D%2C%22isvip%22%3A%7B%22value%22%3A%220%22%2C%22scope%22%3A1%7D%2C%22uid_%22%3A%7B%22value%22%3A%22weixin_52345071%22%2C%22scope%22%3A1%7D%7D; Hm_ct_6bcd52f51e9b3dce32bec4a3997715ac=6525*1*10_30601611580-1653459529558-297725!5744*1*weixin_52345071; log_Id_view=1489; __51uvsct__JQTDiOVZ2pRjGa1K=53; __51vcke__JQTDiOVZ2pRjGa1K=1e84abb9-62df-5ecc-828b-e3052ffe5150; __51vuft__JQTDiOVZ2pRjGa1K=1653459532473; log_Id_click=1057; __gads=ID=f159decf46255d5e-22bbe38364d300d7:T=1653459564:RT=1653459564:S=ALNI_Ma5D0b1QWC6YQ8t-on_R6zAurFD0g; __gpi=UID=000005b633162c48:T=1653459564:RT=1655010298:S=ALNI_Mbd0__O7WINiqjmFo0HJe78mx_xOA; ssxmod_itna=eqUxBDcDu0D=34Bake5DkF6diKbMk00fOexGXhIYDZDiqAPGhDC34UeDIYGCYRRrBe+C3jjBRoqH8m4WT4YKC4I0frQ4B3DEx0=PCjeKiinDCeDIDWeDiDGR7D=xGYDj0KGWD4qDOD3qGyS+=Di8t9DdvC7uQDmTNDGup6D7QDIw6g9frVAeDSW7UxKG=DjubD/4xWHeRWH=5DbgeuDeiDtqD9lw=Dbfd3x0pymkU7wGwIbt4US+NDxBtQExDf7kGC4t5D9h6IOfkD0wEY9xpxWiez8AYRgY5NBietW7ePBg+Ci0Dz4+Dd35DuxDG4ka75qiDD==; ssxmod_itna2=eqUxBDcDu0D=34Bake5DkF6diKbMk00f2DA=uxPtD/K3KDFODxDIg8qqFGFB+oQwiXsYI1EvQw7bKMRj1/+6eoNOKGbng2INO81fi6zL/uMizdaYIy8Dg0Z9bnV80FIZXBPsk1hIg=n=R0n=VW7Q5+IQ3RbsCx9C=gvG2m5bN/y=qFOwqKyQG8v4=B7AYSO+lPqpUC3bRn8IazEFbzT6GgctB3SfmO8GDUSh7RSf/OQhrPdAPk8fRzjITkCRxdKw+OHwVQYb/oIrCR+yC6KgAucT6oFi6ueM/6w10qzQbZHZ68tTRmVimrsWGL+aE/ri7Rh/FgIrLm2OQPhfmmDuuDqhW914PEnRcQnKuAEKeuzPnFpYxqg0ATFWQmwx82Ie+oD07cGPD7=DYF=eD===; UserName=weixin_52345071; UserInfo=26ede6cf39e94eab9c6265a032aa59fa; UserToken=26ede6cf39e94eab9c6265a032aa59fa; UserNick=bug+%E9%83%AD; AU=5FF; UN=weixin_52345071; BT=1653462761522; p_uid=U010000; c_dl_prid=1654675272560_674132; c_dl_rid=1655261165060_497667; c_dl_fref=https://so.csdn.net/so/search; c_dl_fpage=/download/weixin_41174502/12247848; c_dl_um=distribute.pc_relevant.none-task-blog-2%7Edefault%7Ebaidujs_utm_term%7Edefault-0-109910474-blog-119543816.pc_relevant_antiscanv2; management_ques=1653738813836; historyList-new=%5B%22pv%E4%BF%A1%E5%8F%B7%E9%87%8F%20%E4%BA%92%E6%96%A5%E5%92%8C%E5%90%8C%E6%AD%A5%22%5D; BS_coupon=20220618; csrfToken=e_t4KDVKgBezzgQgdwsnos36; c_pref=default; c_ref=default; c_first_ref=default; c_first_page=https%3A//www.csdn.net/%3Fname%3Dbug%25E9%2583%25AD%26password%3D6666666; c_segment=13; dc_tos=rdo8dm; Hm_lpvt_6bcd52f51e9b3dce32bec4a3997715ac=1655552363; dc_sid=6f420d07abdfa80dfbad71a91b5f6c41; __vtins__JQTDiOVZ2pRjGa1K=%7B%22sid%22%3A%20%22ded005ac-68ee-549d-989b-5d0fa7f4a0a1%22%2C%20%22vd%22%3A%201%2C%20%22stt%22%3A%200%2C%20%22dr%22%3A%200%2C%20%22expires%22%3A%201655554164935%2C%20%22ct%22%3A%201655552364935%7D; c_hasSub=true; c_utm_source=702048761; logo_advert_close=1; c_page_id=default; dc_session_id=10_1655552360673.249126; c_dsid=11_1655552362461.267119
Upgrade-Insecure-Requests: 1
Sec-Fetch-Dest: document
Sec-Fetch-Mode: navigate
Sec-Fetch-Site: cross-site
Sec-Fetch-User: ?1
可以看到这里的请求和我们预想构造的一样!
响应
HTTP/1.1 200 OK
Server: openresty
Date: Sat, 18 Jun 2022 11:44:14 GMT
Content-Type: text/html; charset=utf-8
Connection: keep-alive
Keep-Alive: timeout=20
Vary: Accept-Encoding
X-Response-Time: 376
x-xss-protection: 1; mode=block
x-content-type-options: nosniff
x-download-options: noopen
x-readtime: 376
Strict-Transport-Security: max-age=31536000
Content-Length: 520755
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"mod":"popu_459","extra":"{\"utm_medium\":\"distribute.pc_feed_v2.none-task-blog-personrec_tag-5-125326766-null-null.pc_personrec\",\"dist_request_id\":\"1655552654436_96618\"}","dist_request_id":"1655552654436_96618","ab_strategy":"default","index":"5","style":"PIC_V2_13","strategy":"personrec_tag","dest":"https://blog.csdn.net/newlw/article/details/125326766","spm":"1000.2115.3001.6382"}" class="blog"><p class="desc">目录任务描述 21、 必做任务一 22、 必做任务二 33、 必做任务三 34、 选做任务一 3问题建模 41、迷宫 42、Q 表模型 43、监督学习模型 54、Q-learning 学习过程 55、加入时间因子 5算法设计和代码 61、迷宫类 62、Q 表模型类 6UI 设计和使用说明 61、已有迷宫界面 62、用户自定义 7总结 7任务描述1、必做任务一使用强化学习算法，对于给定的迷宫，训练老鼠在迷宫中寻找蛋糕。2、必做任务二自行生成不同迷宫（尺寸、地图），</p></a> <div class="operation"><div><div class="operation-b"><p class="operation-b-img operation-b-img-active"><img src="https://img-home.csdnimg.cn/images/20220117023128.png" alt> <img src="https://img-home.csdnimg.cn/images/20220117023149.png" alt class="img-hover"> <span class="num">2赞</span></p> <p class="operation-b-img operation-b-img-active"><img src="https://img-home.csdnimg.cn/images/20220117023256.png" alt> <img src="https://img-home.csdnimg.cn/images/20220117023314.png" alt class="img-hover"> <span class="num">踩</span></p></div></div> <div class="operation-c"><a target="_blank" href="https://blog.csdn.net/newlw"><span>biyezuopinvip</span></a> <!----> <!----> <div class="el-dropdown" style="margin-left:16px;"><p class="feedback"><img src="https://img-home.csdnimg.cn/images/20220117023327.png" alt="" class="dian"> <img src="https://img-home.csdnimg.cn/images/20220117023333.png" alt="" class="activeDian"></p> <ul class="el-dropdown-menu el-popper community-floor-popper" style="display:none;"><li tabindex="-1" class="el-dropdown-menu__item"><!---->内容质量差</li> <li tabindex="-1" class="el-dropdown-menu__item"><!---->不感兴趣</li> <li tabindex="-1" class="el-dropdown-menu__item"><!---->不喜欢该作者</li> <li tabindex="-1" class="el-dropdown-menu__item"><!---->内容重复</li></ul></div></div></div></div> <!----> <div class="right"><a target="_blank" href="https://blog.csdn.net/newlw/article/details/125326766" data-report-query="spm=1000.2115.3001.6382&utm_medium=distribute.pc_feed_v2.none-task-blog-personrec_tag-5-125326766-null-null.pc_personrec&depth_1-utm_source=distribute.pc_feed_v2.none-task-blog-personrec_tag-5-125326766-null-null.pc_personrec" data-report-click="{
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可以看到这里的响应明明返回的是200 ok但是并没有给我处理这个请求!
基于ajax
ajax是js提供给我们的一种构造http请求的方式!
传统的js下的ajax方式构造方式比较繁琐!
我们就通过引入jQuery(js下的框架类似于java中spring框架)实现对ajax方式请求的构造!
- 引入
jQuery!
jQuery cdn链接
随便找个版本复制下来,这里有两种方式!
1).直接复制到HTML代码中!
2).打开这个链接,然后复制下来,再创建一个js本地文件,然后在HTML中引入这个链接!
<!--方式一:复制到本地-->
<script src="jQuery.js"></script>
<!--方式二:直接复制-->
<script src="http://code.jquery.com/jquery-2.1.1.min.js"></script>
- 构造请求
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>ajax方式构造请求</title>
</head>
<body>
<!--复制到本地-->
<!-- <script src="jQuery.js"></script> -->
<!--直接复制-->
<script src="http://code.jquery.com/jquery-2.1.1.min.js"></script>
script
<script>
$.ajax({
type: "get",
url:"https://www.csdn.net/",
success:function(body){
console.log("ajax方式构造请求,成功!"+body);
},
error:function(){
console.log("请求失败");
}
});
</script>
</body>
</html>
$符号在js中可以用于变量名!
在jQuery中的很对函数都是通过这个$对象访问!
$.ajax();函数
这里的
ajax函数需要传入参数是一个对象!
<script>
$.ajax({
type: "get",
url:"https://www.csdn.net/",
success:function(body){
console.log("ajax方式构造请求,成功!"+body);
},
error:function(){
console.log("请求失败");
}
});
</script>
这里的对象的数据也是用键值对的方式保存信息!
type:"post"
采用那种方法构造请求
这里的构造请求的方法不像form表单只能选择post/get这里所有构造请求的方法都可以选择!~
url:"https://www.csdn.next/"
请求访问的服务器url域名!
success:function(body){ console.log("ajax方式构造请求,成功!"+body); }
请求成功,这里采用回调函数的方式,服务器的响应结果信息保存在body中!
所以我们查看body的信息就可以获取到从服务器中收到的消息!
error:function(){ console.log("请求失败"); }
请求失败,这里打印失败结果!
通过上方这些键值对就通过ajax构造好了一个http请求!
我们看一下我们这个请求最终响应结果!
请求失败了,虽然返回的状态码是200 ok这里存在跨域访问!
我们看到这里报错了!
因为这里我们属于跨站访问了!
什么是跨站访问呢?
我们这里构造请求的
html文件并不在该服务器下!
如果我们的请求网页就在https://www.csdn.net/域名下的服务器,那么就不是跨站(跨域)访问
以后我们把请求写在自己的服务器下就不存在这个问题!
请求:
响应
基于java的方式
这里基于java的方式构造http请求比较繁琐,我们更少使用到!
我们一般通过java中的TCPsocket接口,按照请求报文的格式,构造出一个报文匹配的字符串,然后传入socket发给服务器即可!
但是在实际开发中我们也不会直接就使用socket构造,我们会向ajax一样借助第三方库!
public class HttpClient {
private Socket socket;
private String ip;
private int port;
public HttpClient(String ip, int port) throws IOException {
this.ip = ip;
this.port = port;
socket = new Socket(ip, port);
}
public String get(String url) throws IOException {
StringBuilder request = new StringBuilder();
// 构造首行
request.append("GET " + url + " HTTP/1.1\n");
// 构造 header
request.append("Host: " + ip + ":" + port + "\n");
// 构造 空行
request.append("\n");
// 发送数据
OutputStream outputStream = socket.getOutputStream();
outputStream.write(request.toString().getBytes());
// 读取响应数据
InputStream inputStream = socket.getInputStream();
byte[] buffer = new byte[1024 * 1024];
int n = inputStream.read(buffer);
return new String(buffer, 0, n, "utf-8");
}
public String post(String url, String body) throws IOException {
StringBuilder request = new StringBuilder();
// 构造首行
request.append("POST " + url + " HTTP/1.1\n");
// 构造 header
request.append("Host: " + ip + ":" + port + "\n");
request.append("Content-Length: " + body.getBytes().length + "\n");
request.append("Content-Type: text/plain\n");
// 构造 空行
request.append("\n");
// 构造 body
request.append(body);
// 发送数据
OutputStream outputStream = socket.getOutputStream();
outputStream.write(request.toString().getBytes());
// 读取响应数据
InputStream inputStream = socket.getInputStream();
byte[] buffer = new byte[1024 * 1024];
int n = inputStream.read(buffer);
return new String(buffer, 0, n, "utf-8");
}
public static void main(String[] args) throws IOException {
HttpClient httpClient = new HttpClient("42.192.83.143", 8080);
String getResp = httpClient.get("/AjaxMockServer/info");
System.out.println(getResp);
String postResp = httpClient.post("/AjaxMockServer/info", "this is
body");
System.out.println(postResp);
}
}
可以看到比较繁琐,可以自行参考!
使用Java构造的HTTP客户端不再有 “跨域” 限制了, 此时也可以用来获取其他服务器的数据了.
跨域只是浏览器的行为, 对于 ajax 有效. 对于其他语言来说一般都和跨域无关!