使用HttpClient调用外部系统接口2-HttpClient 模拟登陆，保持会话并进行后续操作

下面主要说明 Form-Based 的验证方式的演示代码，如果登陆时需要一个验证码的话，那只有自己想办法怎么得到这个码了：

package com.example.demo;

import org.apache.commons.httpclient.Cookie;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.NameValuePair;
import org.apache.commons.httpclient.cookie.CookiePolicy;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.methods.PostMethod;

public class HttpClientLogin {
    public
    static void main(String[] args) {
        //登陆 Url
        String loginUrl = "http://192.168.1.100:8080/xx/login.do";

        //需登陆后访问的 Url
        String dataUrl = "http://192.168.1.100:8999/xx/user_info.html?userid=123456";

        HttpClient httpClient = new HttpClient();

        //模拟登陆，按实际服务器端要求选用 Post 或 Get 请求方式
        PostMethod postMethod = new PostMethod(loginUrl);

        //设置登陆时要求的信息，一般就用户名和密码，验证码自己处理了
        NameValuePair[] data = {
                new NameValuePair("username", "aaa"),
                new NameValuePair("password", "123456"),
                new NameValuePair("code", "anyany")
        };

        postMethod.setRequestBody(data);

        try {
            //设置 HttpClient 接收 Cookie,用与浏览器一样的策略
            httpClient.getParams().setCookiePolicy(CookiePolicy.BROWSER_COMPATIBILITY);

            httpClient.executeMethod(postMethod);

            //获得登陆后的 Cookie
            Cookie[] cookies = httpClient.getState().getCookies();

            String tmpcookies = "";
            for (Cookie c : cookies) {
                tmpcookies += c.toString() + ";";
            }

            //进行登陆后的操作
            GetMethod getMethod = new GetMethod(dataUrl);

            //每次访问需授权的网址时需带上前面的 cookie 作为通行证
            getMethod.setRequestHeader("cookie", tmpcookies);

            //你还可以通过 PostMethod/GetMethod 设置更多的请求后数据
            //例如，referer 从哪里来的，UA 像搜索引擎都会表名自己是谁，无良搜索引擎除外,这个也可以不要
//            postMethod.setRequestHeader("Referer", "http://localhost:8080");
//            postMethod.setRequestHeader("User-Agent", "aaa Spot");

            httpClient.executeMethod(getMethod);

            //打印出返回数据，检验一下是否成功
            String text = getMethod.getResponseBodyAsString();
            System.out.println(text);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

要引入jar包

<dependency>
	<groupId>commons-httpclient</groupId>
	<artifactId>commons-httpclient</artifactId>
	<version>3.0.1</version>
</dependency>

参考文章：https://blog.csdn.net/sdbzwangdongdong/article/details/39557501

使用HttpClient调用外部系统接口2-HttpClient 模拟登陆，保持会话并进行后续操作

猜你喜欢