使用JAVA开发微信公众平台接口
研究了下微信公众平台接口开发，可回复用户发来的请求
由于腾讯限制不能每天自动群发送信息
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WeChatServlet 类：
package com.wechat.servlet;import java.io.BufferedReader;import java.io.IOException;import java.util.Arrays;import java.util.Map;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import com.wechat.utils.EncryptUtil;import com.wechat.utils.XmlUtil;public class WeChatServlet extends HttpServlet {private static final long serialVersionUID = 1L;//微信平台上填的Token和这里需要一致public static final String Token = "loveplat";/** * 微信公众平台验证调用方法 */@Overrideprotected void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {String signature = request.getParameter("signature");String timestamp = request.getParameter("timestamp");String nonce = request.getParameter("nonce");String[] ArrTmp = { Token, timestamp, nonce };Arrays.sort(ArrTmp);StringBuffer sb = new StringBuffer();for (int i = 0; i < ArrTmp.length; i++) {sb.append(ArrTmp[i]);}String pwd = EncryptUtil.Encrypt(sb.toString());String echostr = request.getParameter("echostr");System.out.println("pwd=="+pwd);System.out.println("echostr=="+echostr);if(pwd.equals(signature)){if(!"".equals(echostr) && echostr != null){response.getWriter().print(echostr);}}}/** * 用户向公众平台发信息并自动返回信息 */@Overrideprotected void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {StringBuffer sb = new StringBuffer();String line;Map<String, String> map = null;try {request.setCharacterEncoding("UTF-8");BufferedReader reader = request.getReader();while ((line = reader.readLine()) != null) {sb.append(line);}map = XmlUtil.xml2Map(sb.toString());} catch (Exception e) {e.printStackTrace();}sb = new StringBuffer();sb.append("<xml><ToUserName><![CDATA[").append(map.get("xml.FromUserName")).append("]]></ToUserName><FromUserName><![CDATA[").append(map.get("xml.ToUserName")).append("]]></FromUserName><CreateTime>").append(map.get("xml.CreateTime")).append("</CreateTime><MsgType><![CDATA[text]]></MsgType>").append("<Content><![CDATA[收到");sb.append("]]></Content>").append("<FuncFlag>0</FuncFlag></xml>");response.setCharacterEncoding("UTF-8");System.out.println(sb.toString());response.getWriter().print(sb.toString());}@Overridepublic void destroy() {super.destroy();}@Overridepublic void init() throws ServletException {super.init();}}?XmlUtil 类：需要导入jdom.jar包
package com.wechat.utils;import java.io.IOException;import java.io.StringReader;import java.util.HashMap;import java.util.Iterator;import java.util.List;import java.util.Map;import org.jdom.Attribute;import org.jdom.Document;import org.jdom.Element;import org.jdom.JDOMException;import org.jdom.input.SAXBuilder;public class XmlUtil {public static Map<String, String> xml2Map(String xmlStr)throws JDOMException, IOException {Map<String, String> rtnMap = new HashMap<String, String>();SAXBuilder builder = new SAXBuilder();Document doc = builder.build(new StringReader(xmlStr));// 得到根节点Element root = doc.getRootElement();String rootName = root.getName();rtnMap.put("root.name", rootName);// 调用递归函数，得到所有最底层元素的名称和值，加入map中convert(root, rtnMap, rootName);return rtnMap;}/** * 递归函数，找出最下层的节点并加入到map中，由xml2Map方法调用。 * * @param e * xml 节点，包括根节点 * @param map * 目标map * @param lastname * 从根节点到上一级节点名称连接的字串 */public static void convert(Element e, Map<String, String> map,String lastname) {if (e.getAttributes().size() > 0) {Iterator it_attr = e.getAttributes().iterator();while (it_attr.hasNext()) {Attribute attribute = (Attribute) it_attr.next();String attrname = attribute.getName();String attrvalue = e.getAttributeValue(attrname);map.put(lastname + "." + attrname, attrvalue);}}List children = e.getChildren();Iterator it = children.iterator();while (it.hasNext()) {Element child = (Element) it.next();String name = lastname + "." + child.getName();// 如果有子节点，则递归调用if (child.getChildren().size() > 0) {convert(child, map, name);} else {// 如果没有子节点，则把值加入mapmap.put(name, child.getText());// 如果该节点有属性，则把所有的属性值也加入mapif (child.getAttributes().size() > 0) {Iterator attr = child.getAttributes().iterator();while (attr.hasNext()) {Attribute attribute = (Attribute) attr.next();String attrname = attribute.getName();String attrvalue = child.getAttributeValue(attrname);map.put(name + "." + attrname, attrvalue);}}}}}}?
EncryptUtil类：
package com.wechat.utils;import java.security.MessageDigest;import java.security.NoSuchAlgorithmException;public class EncryptUtil {public static String Encrypt(String strSrc) {MessageDigest md = null;String strDes = null;byte[] bt = strSrc.getBytes();try {md = MessageDigest.getInstance("SHA-1");md.update(bt);strDes = bytes2Hex(md.digest()); //to HexString} catch (NoSuchAlgorithmException e) {System.out.println("Invalid algorithm.");return null;}return strDes;}public static String bytes2Hex(byte[] bts) {String des = "";String tmp = null;for (int i = 0; i < bts.length; i++) {tmp = (Integer.toHexString(bts[i] & 0xFF));if (tmp.length() == 1) {des += "0";}des += tmp;}return des;}}?
web.xml：
<?xml version="1.0" encoding="UTF-8"?><web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <servlet> <description>This is the description of my J2EE component</description> <display-name>This is the display name of my J2EE component</display-name> <servlet-name>WeChatServlet</servlet-name> <servlet-class>com.wechat.servlet.WeChatServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>WeChatServlet</servlet-name> <url-pattern>/WeChatServlet</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> </web-app>
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测试案例：
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