4. 建立与微信交互的接口
Example：
/**
* 处理微信请求 servlet
* @author caspar.chen
* @version 1.0
*
*/
public class WeChatServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// 随机字符串
String echostr = request.getParameter("echostr");
PrintWriter out = null;
try {
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，否则接入失败
if (SignService.checkSignature(request)) {
out.print(echostr);
}
} catch (IOException e) {
e.printStackTrace();
} finally {
out.close();
out = null;
}
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
try {
request.setCharacterEncoding("UTF-8");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
response.setCharacterEncoding("UTF-8");
// 调用核心业务类接收消息、处理消息
wechat.rar （33个子文件） 
wechat 
微信SDK使用说明.docx 23KB
org.eclipse.wst.jsdt.ui.superType.name 6B
dom4j-1.6.1.jar 307KB
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