微信大众号开发之接收消息

1、注册微信公众订阅号

2、服务器配置：

URL(服务器地址)：rest/portal/getWeixinTokenToken

(令牌)：XXX

EncodingAESKey(消息加解密密钥)：VzfRmFPyc7BNm84OzNHIY5EwfTkbGmgodF58OW0ZouW

消息加解密方式：明文模式

   URL：用Java编写，部署到服务器

  第一步，访问get方法，验证token

import java.io.IOException;
import java.io.PrintWriter;
@Path("/getWeixinToken")
	@GET
	@Description("微信token验证")
	public void listSchoolHotMessageByPage(@Context HttpServletRequest request, @Context HttpServletResponse response) throws IOException {
		String signature = request.getParameter("signature");  
        // 时间戳  
        String timestamp = request.getParameter("timestamp");  
        // 随机数  
        String nonce = request.getParameter("nonce");  
        // 随机字符串  
        String echostr = request.getParameter("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 (WeiXinSignUtil.checkSignature(signature, timestamp, nonce)) {  
            out.print(echostr);  
        }  
        out.close();  
        out = null;  
	}

package com.mashang.xlb.modules.portalmanage.util;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;

public class WeiXinSignUtil {
	// 与接口配置信息中的Token要一致
	private static String token = "weixinCourse";

	/**
	 * 验证签名
	 * 
	 * @param signature
	 * @param timestamp
	 * @param nonce
	 * @return
	 */
	public static boolean checkSignature(String signature, String timestamp,
			String nonce) {
		String[] arr = new String[] { token, timestamp, nonce };
		// 将token、timestamp、nonce三个参数进行字典序排序
		Arrays.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());
			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;
	}

	/**
	 * 将字节数组转换为十六进制字符串
	 * 
	 * @param byteArray
	 * @return
	 */
	private static String byteToStr(byte[] byteArray) {
		String strDigest = "";
		for (int i = 0; i < byteArray.length; i++) {
			strDigest += byteToHexStr(byteArray[i]);
		}
		return strDigest;
	}

	/**
	 * 将字节转换为十六进制字符串
	 * 
	 * @param mByte
	 * @return
	 */
	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;
	}
}

    2、访问post方法，并将消息发送到服务器：

@Path("/getWeixinToken")
	@POST
	@Description("微信token验证")
	@Consumes(MediaType.TEXT_XML)
	public void getWeixinTokenReceiveMsg(@Context HttpServletRequest request, @Context HttpServletResponse response) throws IOException, IllegalArgumentException, IllegalAccessException, DOMException {
        WeiXinReceiveMsgDTO wxrmDto = parseXml(request);
        LogUtil.debug(log, wxrmDto.toString());
        response.getWriter().write("成功！");  
	}

	private WeiXinReceiveMsgDTO parseXml(HttpServletRequest request) throws IllegalArgumentException, IllegalAccessException, DOMException{
		WeiXinReceiveMsgDTO wxrmDto = new WeiXinReceiveMsgDTO();
		try {
			InputStream is = request.getInputStream();
			DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();   
			DocumentBuilder db = dbf.newDocumentBuilder();   
			Document document = db.parse(is);
			NodeList employees = document.getChildNodes();   
			for (int i = 0; i < employees.getLength(); i++) {   
				Node employee = employees.item(i);   
				NodeList employeeInfo = employee.getChildNodes();   
				for (int j = 0; j < employeeInfo.getLength(); j++) {   
					Node node = employeeInfo.item(j);   
					NodeList employeeMeta = node.getChildNodes();   
					for (int k = 0; k < employeeMeta.getLength(); k++) {   
						this.setOjectFieldValue(wxrmDto,node.getNodeName(),employeeMeta.item(k).getTextContent());
					}   
				}   
			}   
			
		} catch (IOException | ParserConfigurationException | SAXException e) {
			e.printStackTrace();
		}
		return wxrmDto;
	}
	
	/**
	 * 给对象的属性赋值
	 * @param obj 对象
	 * @param name 需要赋值属性名称
	 * @param value 需要的赋值
	 * @throws IllegalArgumentException
	 * @throws IllegalAccessException
	 * @throws NoSuchMethodException
	 * @throws SecurityException
	 */
	private void setOjectFieldValue(Object obj, String name , String value){
		try {
			Field[] flds = obj.getClass().getDeclaredFields(); 
			for (int k2 = 0; k2 < flds.length; k2++) {
				String foeldName = flds[k2].getName().replaceFirst(flds[k2].getName().substring(0, 1), flds[k2].getName().substring(0, 1).toUpperCase());
				if(foeldName.equals(name)){
					//关键。。。可访问私有变量  
					flds[k2].setAccessible(true);
					//对属性赋值
					flds[k2].set(obj, value);
				}
			} 
		} catch (IllegalArgumentException | IllegalAccessException e) {
			e.printStackTrace();
		}
	}