When using java to access a URL, if the URL requires authentication, you cannot access it directly because you are not logged in. So, how to solve this problem?
The method is to use java to simulate login, record the cookie information after login, and send the cookie to indicate identity when the next request is made, so that you can access the URL with permissions.
The following will first introduce the use of java to simulate login.
// 连接地址(通过阅读html源代码获得,即为登陆表单提交的URL) String surl = "http://login.goodjobs.cn/index.php/action/UserLogin"; /** * 首先要和URL下的URLConnection对话。 URLConnection可以很容易的从URL得到。比如: // Using * java.net.URL and //java.net.URLConnection */ URL url = new URL(surl); HttpURLConnection connection = (HttpURLConnection) url.openConnection(); /** * 然后把连接设为输出模式。URLConnection通常作为输入来使用,比如下载一个Web页。 * 通过把URLConnection设为输出,你可以把数据向你个Web页传送。下面是如何做: */ connection.setDoOutput(true); /** * 最后,为了得到OutputStream,简单起见,把它约束在Writer并且放入POST信息中,例如: ... */ OutputStreamWriter out = new OutputStreamWriter(connection .getOutputStream(), "GBK"); //其中的memberName和password也是阅读html代码得知的,即为表单中对应的参数名称 out.write("memberName=myMemberName&password=myPassword"); // post的关键所在! // remember to clean up out.flush(); out.close(); // 取得cookie,相当于记录了身份,供下次访问时使用 String cookieVal = connection.getHeaderField("Set-Cookie");
After successful login, you can access other URLs.
String s = "http://user.goodjobs.cn/dispatcher.php/module/Resume/action/Preview"; //重新打开一个连接 url = new URL(s); HttpURLConnection resumeConnection = (HttpURLConnection) url .openConnection(); if (cookieVal != null) { //发送cookie信息上去,以表明自己的身份,否则会被认为没有权限 resumeConnection.setRequestProperty("Cookie", cookieVal); } resumeConnection.connect(); InputStream urlStream = resumeConnection.getInputStream(); BufferedReader bufferedReader = new BufferedReader( new InputStreamReader(urlStream)); String ss = null; String total = ""; while ((ss = bufferedReader.readLine()) != null) { total += ss; } IOUtils.write(total, new FileOutputStream("d:/index.html")); bufferedReader.close();
Through the above method, you can access URLs with permission control. The idea is: simulate login, obtain a cookie to record the identity, and send the cookie to indicate the identity on the next request.
The above is the entire content of this article. I hope it will be helpful to everyone's study. I also hope that everyone will support the PHP Chinese website.
For more articles related to java simulated cookie login operations, please pay attention to the PHP Chinese website!

This article analyzes the top four JavaScript frameworks (React, Angular, Vue, Svelte) in 2025, comparing their performance, scalability, and future prospects. While all remain dominant due to strong communities and ecosystems, their relative popul

The article discusses implementing multi-level caching in Java using Caffeine and Guava Cache to enhance application performance. It covers setup, integration, and performance benefits, along with configuration and eviction policy management best pra

Node.js 20 significantly enhances performance via V8 engine improvements, notably faster garbage collection and I/O. New features include better WebAssembly support and refined debugging tools, boosting developer productivity and application speed.

Java's classloading involves loading, linking, and initializing classes using a hierarchical system with Bootstrap, Extension, and Application classloaders. The parent delegation model ensures core classes are loaded first, affecting custom class loa

This article addresses the CVE-2022-1471 vulnerability in SnakeYAML, a critical flaw allowing remote code execution. It details how upgrading Spring Boot applications to SnakeYAML 1.33 or later mitigates this risk, emphasizing that dependency updat

Iceberg, an open table format for large analytical datasets, improves data lake performance and scalability. It addresses limitations of Parquet/ORC through internal metadata management, enabling efficient schema evolution, time travel, concurrent w

This article explores methods for sharing data between Cucumber steps, comparing scenario context, global variables, argument passing, and data structures. It emphasizes best practices for maintainability, including concise context use, descriptive

This article explores integrating functional programming into Java using lambda expressions, Streams API, method references, and Optional. It highlights benefits like improved code readability and maintainability through conciseness and immutability


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

Dreamweaver CS6
Visual web development tools

SecLists
SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.

MantisBT
Mantis is an easy-to-deploy web-based defect tracking tool designed to aid in product defect tracking. It requires PHP, MySQL and a web server. Check out our demo and hosting services.

mPDF
mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),

ZendStudio 13.5.1 Mac
Powerful PHP integrated development environment
