使用Apache HttpClient实现自动登录并提交表单功能

参考了网上的一些资料，实现表单提交功能，如果需要登录则自动进行登录（适用于form-auth的情况）。

package test;

import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.methods.PostMethod;

/**
 * 测试登录并提交表单功能
 * @author adun
 */
public class HttpTest {
	
	static HttpClient CONN = new HttpClient();
	
	static String DATA_ACTION = "http://localhost:8000/proc.jsp";
	static String SIGNIN_ACTION = "http://localhost:8000/j_security_check";

	public static void main(String[] args) throws Exception {
		if(!postData()) {
			System.out.println("尚未登录，尝试自动登录...");
			postSignin();
			postData();
		}
	}
	
	/**
	 * 提交数据
	 * @return 是否提交成功
	 * @throws Exception
	 */
	public static boolean postData() throws Exception {
		UTF8PostMethod procPost = new UTF8PostMethod(DATA_ACTION);
		procPost.addParameter("name", "天津爱通科技有限公司");
		System.out.println("尝试提交数据...");
		CONN.executeMethod(procPost);
		String body = procPost.getResponseBodyAsString();
		boolean success = body.indexOf("j_security_check") < 0;
		if(!success) {
			System.out.println("数据提交成功！");
		}
		return success;
	}
	
	/**
	 * 登录过程
	 * @throws Exception
	 */
	public static void postSignin() throws Exception {
		UTF8PostMethod signinPost = new UTF8PostMethod(SIGNIN_ACTION);
		signinPost.addParameter("j_username", "admin");
		signinPost.addParameter("j_password", "admin");
		CONN.executeMethod(signinPost);
	}
}

/**
 * 重写PostMethod以解决UTF-8编码问题
 * @author adun
 */
class UTF8PostMethod extends PostMethod {
	public UTF8PostMethod(String url) {
        super(url);
    }
	
    @Override
    public String getRequestCharSet() {
        return "UTF-8";
    }
}