Home Java javaTutorial Example analysis of how Javaweb uses cors to complete cross-domain ajax data interaction

Example analysis of how Javaweb uses cors to complete cross-domain ajax data interaction

Sep 20, 2017 am 10:13 AM
cors javaweb web

This article starts with the concepts of cross-domain and cors, and then introduces the relevant content of Javaweb using cors to complete cross-domain ajax data interaction. Friends who need it can learn more.

Cross-domain means that the browser cannot execute scripts from other websites. It is caused by the browser's Same Origin Policy, a security restriction imposed by the browser on JavaScript.

ajax itself actually interacts with data through the XMLHttpRequest object. However, for security reasons, the browser does not allow js code to perform cross-domain operations, so a warning will be issued.

cors

Full name: Cross-Origin Resource Sharing

Chinese meaning: Cross-origin resource sharing

Its definition on Wikipedia is: Cross-Origin Resource Sharing (CORS) is a technical specification for web browsers that defines a way for web servers to allow web pages to access their resources from different domains. This access is prohibited by the same-origin policy. The CORS system defines a way for browsers and servers to interact to determine whether cross-domain requests are allowed. It's a compromise that allows for more flexibility, but is more secure than simply allowing all of these requirements.

1. Reference through Maven

cors-filter、


<!-- 跨域问题 --> 
  <dependency> 
  <groupId>com.thetransactioncompany</groupId> 
  <artifactId>cors-filter</artifactId> 
  <version>2.5</version> 
 </dependency> 
 <dependency> 
  <groupId>com.thetransactioncompany</groupId> 
  <artifactId>java-property-utils</artifactId> 
  <version>1.10</version> 
 </dependency>
Copy after login

2. In web.xml Configure the filter inside and use the filter defined in the imported jar. Pay attention to modifying the cors.allowOrigin node. If cross-domain access is allowed for all sites, it can be modified to [*]. If there are multiple sites, the configuration can be separated by [,].


<!-- 跨域问题 --> 
  <filter> 
  <description>跨域过滤器</description> 
  <filter-name>CORS</filter-name> 
  <filter-class>com.thetransactioncompany.cors.CORSFilter</filter-class> 
  <init-param> 
   <param-name>cors.allowOrigin</param-name> 
   <param-value>https://127.0.0.1:8380</param-value> 
  </init-param> 
  <init-param> 
   <param-name>cors.supportedMethods</param-name> 
   <param-value>GET, POST, HEAD, PUT, DELETE</param-value> 
  </init-param> 
  <init-param> 
   <param-name>cors.supportedHeaders</param-name> 
   <param-value>Accept, Origin, X-Requested-With, Content-Type, Last-Modified</param-value> 
  </init-param> 
  <init-param> 
   <param-name>cors.exposedHeaders</param-name> 
   <param-value>Set-Cookie</param-value> 
  </init-param> 
  <init-param> 
   <param-name>cors.supportsCredentials</param-name> 
   <param-value>true</param-value> 
  </init-param> 
 </filter> 
 <filter-mapping> 
  <filter-name>CORS</filter-name> 
  <url-pattern>/*</url-pattern> 
 </filter-mapping>
Copy after login

3. Call data across domains through jQuery. The example code is as follows:


<!DOCTYPE html> 
<html lang="en" xmlns="https://www.w3.org/1999/xhtml"> 
<head> 
 <meta charset="utf-8" /> 
 <title>跨域测试</title> 
 <style type="text/css"> 
  body{ 
   margin:0px auto 0px auto; 
  } 
  .p_container { 
   margin: 0px auto 0px auto; 
   width: 100%; 
   height: 200px; 
  } 
   .p_container > iframe { 
    width: 100%; 
    height: 100%; 
   } 
 </style> 
</head> 
<body> 
 <p> 
 </p> 
 <button id="btn_test">跨域调用</button> 
 <p id="p_show"></p> 
 <script src="jquery-1.8.3.min.js" type="text/javascript"></script> 
 <script type="text/javascript"> 
  $(function () { 
   $(&#39;#btn_test&#39;).click(function () { 
    //alert(&#39;dddd&#39;); 
    //var iframe_main = $("#iframe_main").contents(); 
    //iframe_main.find("#account").val(&#39;test&#39;); 
    $.ajax({ 
     url: "https://10.18.25.119:8480/jxfp/index.jsp", 
     type: "GET", 
     dataType: "text", 
     timeout: 10000, 
     xhr: function () {  //这是关键 获取原生的xhr对象 做以前做的所有事情 
      var xhr = jQuery.ajaxSettings.xhr(); 
      xhr.withCredentials = true; 
      return xhr; 
     },      
     success: function (data) { 
      $("#p_show").html(data); 
      //Console.log(data); 
     }, 
     error: function (e) { 
      $("#p_show").html(e.statusText); 
     } 
    }); 
   }); 
  }); 
 </script> 
</body> 
</html>
Copy after login

The above is the detailed content of Example analysis of how Javaweb uses cors to complete cross-domain ajax data interaction. For more information, please follow other related articles on the PHP Chinese website!

Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

AI Hentai Generator

AI Hentai Generator

Generate AI Hentai for free.

Hot Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
2 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
Repo: How To Revive Teammates
1 months ago By 尊渡假赌尊渡假赌尊渡假赌
Hello Kitty Island Adventure: How To Get Giant Seeds
4 weeks ago By 尊渡假赌尊渡假赌尊渡假赌

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

How to use Nginx web server caddy How to use Nginx web server caddy May 30, 2023 pm 12:19 PM

Introduction to Caddy Caddy is a powerful and highly scalable web server that currently has 38K+ stars on Github. Caddy is written in Go language and can be used for static resource hosting and reverse proxy. Caddy has the following main features: Compared with the complex configuration of Nginx, its original Caddyfile configuration is very simple; it can dynamically modify the configuration through the AdminAPI it provides; it supports automated HTTPS configuration by default, and can automatically apply for HTTPS certificates and configure it; it can be expanded to data Tens of thousands of sites; can be executed anywhere with no additional dependencies; written in Go language, memory safety is more guaranteed. First of all, we install it directly in CentO

Real-time protection against face-blocking barrages on the web (based on machine learning) Real-time protection against face-blocking barrages on the web (based on machine learning) Jun 10, 2023 pm 01:03 PM

Face-blocking barrage means that a large number of barrages float by without blocking the person in the video, making it look like they are floating from behind the person. Machine learning has been popular for several years, but many people don’t know that these capabilities can also be run in browsers. This article introduces the practical optimization process in video barrages. At the end of the article, it lists some applicable scenarios for this solution, hoping to open it up. Some ideas. mediapipeDemo (https://google.github.io/mediapipe/) demonstrates the mainstream implementation principle of face-blocking barrage on-demand up upload. The server background calculation extracts the portrait area in the video screen, and converts it into svg storage while the client plays the video. Download svg from the server and combine it with barrage, portrait

How to configure nginx to ensure that the frps server and web share port 80 How to configure nginx to ensure that the frps server and web share port 80 Jun 03, 2023 am 08:19 AM

First of all, you will have a doubt, what is frp? Simply put, frp is an intranet penetration tool. After configuring the client, you can access the intranet through the server. Now my server has used nginx as the website, and there is only one port 80. So what should I do if the FRP server also wants to use port 80? After querying, this can be achieved by using nginx's reverse proxy. To add: frps is the server, frpc is the client. Step 1: Modify the nginx.conf configuration file in the server and add the following parameters to http{} in nginx.conf, server{listen80

Using Jetty7 for Web server processing in Java API development Using Jetty7 for Web server processing in Java API development Jun 18, 2023 am 10:42 AM

Using Jetty7 for Web Server Processing in JavaAPI Development With the development of the Internet, the Web server has become the core part of application development and is also the focus of many enterprises. In order to meet the growing business needs, many developers choose to use Jetty for web server development, and its flexibility and scalability are widely recognized. This article will introduce how to use Jetty7 in JavaAPI development for We

How to implement form validation for web applications using Golang How to implement form validation for web applications using Golang Jun 24, 2023 am 09:08 AM

Form validation is a very important link in web application development. It can check the validity of the data before submitting the form data to avoid security vulnerabilities and data errors in the application. Form validation for web applications can be easily implemented using Golang. This article will introduce how to use Golang to implement form validation for web applications. 1. Basic elements of form validation Before introducing how to implement form validation, we need to know what the basic elements of form validation are. Form elements: form elements are

How to enable administrative access from the cockpit web UI How to enable administrative access from the cockpit web UI Mar 20, 2024 pm 06:56 PM

Cockpit is a web-based graphical interface for Linux servers. It is mainly intended to make managing Linux servers easier for new/expert users. In this article, we will discuss Cockpit access modes and how to switch administrative access to Cockpit from CockpitWebUI. Content Topics: Cockpit Entry Modes Finding the Current Cockpit Access Mode Enable Administrative Access for Cockpit from CockpitWebUI Disabling Administrative Access for Cockpit from CockpitWebUI Conclusion Cockpit Entry Modes The cockpit has two access modes: Restricted Access: This is the default for the cockpit access mode. In this access mode you cannot access the web user from the cockpit

Is PHP front-end or back-end in web development? Is PHP front-end or back-end in web development? Mar 24, 2024 pm 02:18 PM

PHP belongs to the backend in web development. PHP is a server-side scripting language, mainly used to process server-side logic and generate dynamic web content. Compared with front-end technology, PHP is more used for back-end operations such as interacting with databases, processing user requests, and generating page content. Next, specific code examples will be used to illustrate the application of PHP in back-end development. First, let's look at a simple PHP code example for connecting to a database and querying data:

How to use CORS cross-domain request in PHP-Slim framework? How to use CORS cross-domain request in PHP-Slim framework? Jun 03, 2023 am 08:10 AM

In web development, cross-domain requests are a common problem. This is because browsers have strict restrictions on requests between different domain names. For example, website A's front-end code cannot send requests directly to website B's API unless website B allows cross-domain requests. In order to solve this problem, CORS (Cross-Origin Resource Sharing) technology emerged. This article will introduce how to use CORS cross-domain requests in the PHP-Slim framework. 1. What is CORSCORS? It is a mechanism that adds some amounts to the corresponding HTTP header.

See all articles