首先，想用开放模式需要先成为开发者。成为开发者有两种写法。
一是：通过jsp页面，用out.print("echostr")//SHA1加密的字符串；
二是：通过Servlet。doGet返回exhostr，给微信平台。
这里我只写第二种方式的请求（这里的请求是以get方式请求），代码如下：
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Arrays;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.jdom.JDOMException;
/**
* 微信统一入口
* @author slz
* 2013-7-26 上午10:17:08
*/
public class WeixinServlet extends HttpServlet {
public WeixinServlet() {
super();
}
public void destroy() {
super.destroy();
}
/**
* 微信公众平台 成为开发者验证入口
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request, response);
}
/**
* 微信公众平台 所有接口入口
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setCharacterEncoding("UTF-8");
request.setCharacterEncoding("UTF-8");
PrintWriter out = response.getWriter();
String TOKEN = "sun";//Token
String signature = request.getParameter("signature");//SHA1加密字符串
String timestamp = request.getParameter("timestamp");//时间
String nonce = request.getParameter("nonce");//随机数
String echoStr = request.getParameter("echostr");//随机字符串
if(StrUtil.isNotNull(echoStr)){
String[] a = {TOKEN,timestamp,nonce};
Arrays.sort(a);//数组排序
String str = "";
for(int i=0;i<a.length;i++){
str += a[i];
}
String echo = new SHA1().getDigestOfString(str.getBytes());//SHA1加密
if(echo.equals(signature)){
out.print(echoStr);
}else{
out.print("123");
}
}else{
try {
InputStream is = request.getInputStream();
PushManage push = new PushManage();
String getXml = push.PushManageXml(is);
System.out.println("getXml:"+getXml);
out.print(getXml);
} catch (JDOMException e) {
out.print("");
}
}
out.flush();
out.close();
}
}
当我们完成第一步成为开发者后，我们就可以用微信提供给我们的接口。
大家应该也看见上面有doPost方法（微信公共平台 所有接口入口）。当我们成为开发者后，微信用户向我们的公众账号发信息都是post请求。
//这里写法多种，怎么写就要看你这么获取微信请求时发给我们的XML
InputStream is = request.getInputStream();
PushManage push = new PushManage();
String getXml = push.PushManageXml(is);
此方法代码如下：
import java.io.IOException;
import java.io.InputStream;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.JDOMException;
import org.jdom.input.SAXBuilder;
import org.jdom.output.XMLOutputter;
/**
* 微信所有接口入口
* @author slz
* 2013-7-26 上午11:01:08
*/
public class PushManage {
public String PushManageXml(InputStream is) throws JDOMException{
String returnStr = "";
String toName = "";
String FromName = "";
String type = "";
String content = "";
String con = "";
String event = "";//自定义按钮事件请求
String eKey = "";//事件请求key值
try {
SAXBuilder sax = new SAXBuilder();
Document doc = sax.build(is);
//获得文件的根元素
Element root = doc.getRootElement();
//获得根元素的第一级子节点
List list = root.getChildren();
for(int j=0;j<list.size();j++){
//获得结点
Element first = (Element) list.get(j);
if(first.getName().equals("ToUserName")){
toName = first.getValue().trim();
}else if(first.getName().equals("FromUserName")){
FromName = first.getValue().trim();
}else if(first.getName().equals("MsgType")){
type = first.getValue().trim();
}else if(first.getName().equals("Content")){
con = first.getValue().trim();
}else if(first.getName().equals("Event")){
event = first.getValue().trim();
}else if(first.getName().equals("EventKey")){
eKey = first.getValue().trim();
}
}
} catch (IOException e) {
e.printStackTrace();
}
if(type.equals("event")){
if(event.equals("subscribe")){//此为关注事件
content = "您好，欢迎关注我！";
}
}else if(type.equals("text")){
if(con.equals("help")||con.equals("帮助")||con.equals("?")||con.equals("？")){
content = "帮助中心\n\n";
}else if(con.equals("bind")||con.equals("绑定")){
content = "点击 <A \‘\‘" target=_blank>绑定账户</A>";
}else if(con.startsWith("ck")||con.startsWith("CK")){
String order_id = "0";
con.toLowerCase();
if(con.startsWith("ck")){
order_id = con.substring(con.indexOf("ck")+2);
}else if(con.startsWith("CK")){
order_id = con.substring(con.indexOf("CK")+2);
}
if(!"".equals(order_id)){
StringBuffer sb = new StringBuffer();
sb.append("订单详情...\n");
content = sb.toString();
}else{
content = "未查询到相应信息,请重新输入！";
}
}
}
//以下为自定义按钮事件
if(eKey.equals("music")){//音乐请求
returnStr = getBackXMLTypeMusic(toName, FromName,
}else if(eKey.equals("img")){//图片请求
content
returnStr = getBackXMLTypeImg(toName, FromName, content);
}else{//无自定义按钮返回上面的文本信息
returnStr = getBackXMLTypeText(toName, FromName, content);
}
return returnStr;
}
public String getBackXMLTypeText(String toName, String FromName, String content){
String returnStr = "";
SimpleDateFormat format=new SimpleDateFormat("yyyyMMddHHmmss");
String times = format.format(new Date());
Element rootXML = new Element("xml");
rootXML.addContent(new Element("ToUserName").setText(FromName));
rootXML.addContent(new Element("FromUserName").setText(toName));
rootXML.addContent(new Element("CreateTime").setText(times));
rootXML.addContent(new Element("MsgType").setText("text"));
rootXML.addContent(new Element("Content").setText(content));
Document doc = new Document(rootXML);
XMLOutputter XMLOut = new XMLOutputter();
returnStr = XMLOut.outputString(doc);
return returnStr;
}
public String getBackXMLTypeImg(String toName, String FromName, String content){
String returnStr = "";
SimpleDateFormat format=new SimpleDateFormat("yyyyMMddHHmmss");
String times = format.format(new Date());
Element rootXML = new Element("xml");
rootXML.addContent(new Element("ToUserName").setText(FromName));
rootXML.addContent(new Element("FromUserName").setText(toName));
rootXML.addContent(new Element("CreateTime").setText(times));
rootXML.addContent(new Element("MsgType").setText("news"));
rootXML.addContent(new Element("ArticleCount").setText("3"));
Element fXML = new Element("Articles");
Element mXML = null;
String url = "";
String ss = "";
for(int i = 1 ;i<=3;i++){
mXML = new Element("item");
mXML.addContent(new Element("Title").setText("图片"+i));
mXML.addContent(new Element("Description").setText("美女"+i));
mXML.addContent(new Element("PicUrl").setText(ss));
mXML.addContent(new Element("Url").setText(url));
fXML.addContent(mXML);
}
rootXML.addContent(fXML);
Document doc = new Document(rootXML);
XMLOutputter XMLOut = new XMLOutputter();
returnStr = XMLOut.outputString(doc);
return returnStr;
}
public String getBackXMLTypeMusic(String toName, String FromName, String content){
String returnStr = "";
SimpleDateFormat format=new SimpleDateFormat("yyyyMMddHHmmss");
String times = format.format(new Date());
Element rootXML = new Element("xml");
rootXML.addContent(new Element("ToUserName").setText(FromName));
rootXML.addContent(new Element("FromUserName").setText(toName));
rootXML.addContent(new Element("CreateTime").setText(times));
rootXML.addContent(new Element("MsgType").setText("music"));
Element mXML = new Element("Music");
mXML.addContent(new Element("Title").setText("音乐"));
mXML.addContent(new Element("Description").setText("音乐让人心情舒畅！"));
mXML.addContent(new Element("MusicUrl").setText(content));
mXML.addContent(new Element("HQMusicUrl").setText(content));
rootXML.addContent(mXML);
Document doc = new Document(rootXML);
XMLOutputter XMLOut = new XMLOutputter();
returnStr = XMLOut.outputString(doc);
return returnStr;
}
}
以上方法用到的jar包：jdom.jar