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
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
*/
@Override
protected 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
*/
@Override
protected 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());
}
@Override
public void destroy() {
super.destroy();
}
@Override
public 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map
map.put(name, child.getText());
// 如果该节点有属性，则把所有的属性值也加入map
if (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>
测试案例：
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做了个最简单的回复信息，由于获取不到用户信息还没有想到好的想法
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