微信公众平台开发学习记录(1)————服务器配置和服务器地址验证

最近开始自学微信公众平台开发，记录一下自己学习的东西，方便自己温故，也希望能帮助到别人。

服务器配置

注意URL服务器地址  外网的80端口，Token  随便填写，微信服务器加密时候会带上这个值，与验证方法的token匹配即可。

服务器地址验证方法

package com.qs.action;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts2.interceptor.ServletRequestAware;
import org.apache.struts2.interceptor.ServletResponseAware;

import com.opensymphony.xwork2.ActionSupport;
import com.qs.util.SignUtil;

/**
 * @author qiaoshuai
 * @createDate 2016-3-1
 */
public class TestWeiXinAction extends ActionSupport implements
		ServletRequestAware, ServletResponseAware {

	private static final long serialVersionUID = -799327593656049028L;
	protected HttpServletRequest request;
	private HttpServletResponse response;

	public void setServletResponse(HttpServletResponse response) {
		this.response = response;
	}

	public void setServletRequest(HttpServletRequest request) {
		this.request = request;
	}

	public void checkSignature() throws IOException {
		// 微信加密签名
		String signature = request.getParameter("signature");
		System.out.println("signature=" + signature);

		// 时间戳
		String timestamp = request.getParameter("timestamp");
		System.out.println("timestamp=" + timestamp);

		// 随机数
		String nonce = request.getParameter("nonce");
		System.out.println("nonce=" + nonce);

		// 随机字符串
		String echostr = request.getParameter("echostr");
		System.out.println("echostr=" + echostr);
		PrintWriter out = response.getWriter();
		// 通过检验signature对请求进行校验，若校验成功则原样返回echostr，表示接入成功，否则接入失败
		if (SignUtil.checkSignature(signature, timestamp, nonce)) {
			out.print(echostr);
		}
		out.close();
		out = null;

	}

}

package com.qs.util;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

/**
 * 请求校验工具类
 */
public class SignUtil {
	// 与接口配置信息中的Token要一致
	private static String token = "qs";

	public static boolean checkSignature(String signature, String timestamp,
			String nonce) {
		// 从请求中（也就是微信服务器传过来的）拿到的token, timestamp, nonce
		String[] arr = new String[] { token, timestamp, nonce };
		// 将token、timestamp、nonce三个参数进行字典序排序
		sort(arr);
		StringBuilder content = new StringBuilder();
		for (int i = 0; i < arr.length; i++) {
			content.append(arr[i]);
		}
		MessageDigest md = null;
		String tmpStr = null;

		try {
			md = MessageDigest.getInstance("SHA-1");
			// 将三个参数字符串拼接成一个字符串进行sha1加密
			byte[] digest = md.digest(content.toString().getBytes());
			// 将字节数组转成字符串
			tmpStr = byteToStr(digest);
		} catch (NoSuchAlgorithmException e) {
			e.printStackTrace();
		}

		content = null;
		// 将sha1加密后的字符串可与signature对比，标识该请求来源于微信
		return tmpStr != null ? tmpStr.equals(signature.toUpperCase()) : false;
	}

	// 将加密后的字节数组变成字符串
	private static String byteToStr(byte[] byteArray) {
		String strDigest = "";
		for (int i = 0; i < byteArray.length; i++) {
			strDigest += byteToHexStr(byteArray[i]);
		}
		return strDigest;
	}

	private static String byteToHexStr(byte mByte) {
		char[] Digit = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A',
				'B', 'C', 'D', 'E', 'F' };
		char[] tempArr = new char[2];
		tempArr[0] = Digit[(mByte >>> 4) & 0X0F];
		tempArr[1] = Digit[mByte & 0X0F];

		String s = new String(tempArr);
		return s;
	}

	// 用于字典排序
	public static void sort(String a[]) {
		for (int i = 0; i < a.length - 1; i++) {
			for (int j = i + 1; j < a.length; j++) {
				if (a[j].compareTo(a[i]) < 0) {
					String temp = a[i];
					a[i] = a[j];
					a[j] = temp;
				}
			}
		}
	}
}