微信公众开放平台开发02---微信公众平台PHP接口和java接口对比

微信公众开放平台开发02---微信公众平台PHP接口和java接口对比
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这一节中的代码收集于网友的制作
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a.java-jsp版
b.PHP的接口代码:
<?php
/**
* wechat php test
*/

//define your token
define("TOKEN", "weixin");
$wechatObj = new wechatCallbackapiTest();
$wechatObj->valid();

class wechatCallbackapiTest
{
public function valid()
{
$echoStr = $_GET["echostr"];

//valid signature , option
if($this->checkSignature()){
echo $echoStr;
exit;
}
}

public function responseMsg()
{
//get post data, May be due to the different environments
$postStr = $GLOBALS["HTTP_RAW_POST_DATA"];

//extract post data
if (!empty($postStr)){

$postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);
$fromUsername = $postObj->FromUserName;
$toUsername = $postObj->ToUserName;
$keyword = trim($postObj->Content);
$time = time();
$textTpl = "<xml>
<ToUserName><![CDATA[%s]]></ToUserName>
<FromUserName><![CDATA[%s]]></FromUserName>
<CreateTime>%s</CreateTime>
<MsgType><![CDATA[%s]]></MsgType>
<Content><![CDATA[%s]]></Content>
<FuncFlag>0</FuncFlag>
</xml>";
if(!empty( $keyword ))
{
$msgType = "text";
$contentStr = "Welcome to wechat world!";
$resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgType, $contentStr);
echo $resultStr;
}else{
echo "Input something...";
}

}else {
echo "";
exit;
}
}

private function checkSignature()
{
$signature = $_GET["signature"];
$timestamp = $_GET["timestamp"];
$nonce = $_GET["nonce"];

$token = TOKEN;
$tmpArr = array($token, $timestamp, $nonce);
sort($tmpArr);
$tmpStr = implode( $tmpArr );
$tmpStr = sha1( $tmpStr );

if( $tmpStr == $signature ){
return true;
}else{
return false;
}
}
}

?>
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c.java版接口
<%@page import="java.util.Date"%>
<%@page import="org.dom4j.Element"%>
<%@page import="org.dom4j.DocumentHelper"%>
<%@page import="org.dom4j.Document"%>
<%@page import="java.io.IOException"%>
<%@page import="java.io.InputStreamReader"%>
<%@page import="java.io.BufferedReader"%>
<%@page import="java.io.Reader"%>
<%@page import="java.security.MessageDigest"%>
<%@page import="java.util.Arrays"%>
<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%>
<%
//WeiXinHandler为内部类不能使用非final类型的对象
final String TOKEN="weixin";
final HttpServletRequest final_request=request;
final HttpServletResponse final_response=response;
%>
<%
class WeiXinHandler{
public void valid(){
String echostr=final_request.getParameter("echostr");
if(null==echostr||echostr.isEmpty()){
responseMsg();
}else{
if(this.checkSignature()){
this.print(echostr);
}else{
this.print("error");
}
}
}
//自动回复内容
public void responseMsg(){
String postStr=null;
try{
postStr=this.readStreamParameter(final_request.getInputStream());
}catch(Exception e){
e.printStackTrace();
}
//System.out.println(postStr);
if (null!=postStr&&!postStr.isEmpty()){
Document document=null;
try{
document = DocumentHelper.parseText(postStr);
}catch(Exception e){
e.printStackTrace();
}
if(null==document){
this.print("");
return;
}
Element root=document.getRootElement();
String fromUsername = root.elementText("FromUserName");
String toUsername = root.elementText("ToUserName");
String keyword = root.elementTextTrim("Content");
String time = new Date().getTime()+"";
String textTpl = "<xml>"+
"<ToUserName><![CDATA[%1$s]]></ToUserName>"+
"<FromUserName><![CDATA[%2$s]]></FromUserName>"+
"<CreateTime>%3$s</CreateTime>"+
"<MsgType><![CDATA[%4$s]]></MsgType>"+
"<Content><![CDATA[%5$s]]></Content>"+
"<FuncFlag>0</FuncFlag>"+
"</xml>";

if(null!=keyword&&!keyword.equals(""))
{
String msgType = "text";
String contentStr = "Welcome to wechat world!";
String resultStr = textTpl.format(textTpl, fromUsername, toUsername, time, msgType, contentStr);
this.print(resultStr);
}else{
this.print("Input something...");
}

}else {
this.print("");
}
}
//微信接口验证
public boolean checkSignature(){
String signature = final_request.getParameter("signature");
String timestamp = final_request.getParameter("timestamp");
String nonce = final_request.getParameter("nonce");
String token=TOKEN;
String[] tmpArr={token,timestamp,nonce};
Arrays.sort(tmpArr);
String tmpStr=this.ArrayToString(tmpArr);
tmpStr=this.SHA1Encode(tmpStr);
if(tmpStr.equalsIgnoreCase(signature)){
return true;
}else{
return false;
}
}
//向请求端发送返回数据
public void print(String content){
try{
final_response.getWriter().print(content);
final_response.getWriter().flush();
final_response.getWriter().close();
}catch(Exception e){

}
}
//数组转字符串
public String ArrayToString(String [] arr){
StringBuffer bf = new StringBuffer();
for(int i = 0; i < arr.length; i++){
bf.append(arr[i]);
}
return bf.toString();
}
//sha1加密
public String SHA1Encode(String sourceString) {
String resultString = null;
try {
resultString = new String(sourceString);
MessageDigest md = MessageDigest.getInstance("SHA-1");
resultString = byte2hexString(md.digest(resultString.getBytes()));
} catch (Exception ex) {
}
return resultString;
}
public final String byte2hexString(byte[] bytes) {
StringBuffer buf = new StringBuffer(bytes.length * 2);
for (int i = 0; i < bytes.length; i++) {
if (((int) bytes[i] & 0xff) < 0x10) {
buf.append("0");
}
buf.append(Long.toString((int) bytes[i] & 0xff, 16));
}
return buf.toString().toUpperCase();
}
//从输入流读取post参数
public String readStreamParameter(ServletInputStream in){
StringBuilder buffer = new StringBuilder();
BufferedReader reader=null;
try{
reader = new BufferedReader(new InputStreamReader(in));
String line=null;
while((line = reader.readLine())!=null){
buffer.append(line);
}
}catch(Exception e){
e.printStackTrace();
}finally{
if(null!=reader){
try {
reader.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return buffer.toString();
}
}
%>
<%
WeiXinHandler handler=new WeiXinHandler();
handler.valid();
%>
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d.以上就是PHP接口和JSP接口的所有代码，
现在我们来对一些需要注意的地方做下分析：
首先的从总体看的话，jsp要比PHP繁琐一些，因为很多函数需要自己写，
像sha1加密，解析xml字符串等都需要自己找第三方的库。
第一点，我们要获取微信公众平台给jsp发送的post或get参数，正常情况下都是用request.getParameter就可以获取到，
但是在写的过程中发现PHP是这样获取
$postStr = $GLOBALS["HTTP_RAW_POST_DATA"];
这时通过查询一些资料知道这样获取的是无法通过$_GET或$_POST函数得到的”未识别 MIME 类型的数据“，原始的 POST 数据
所以这里使用获取原始数据流的方式来解析post的xml数据
String postStr=null;
try{
postStr=this.readStreamParameter(final_request.getInputStream());
}catch(Exception e){
e.printStackTrace();
}
-----------------------------------------------------
//从输入流读取post参数
public String readStreamParameter(ServletInputStream in){
StringBuilder buffer = new StringBuilder();
BufferedReader reader=null;
try{
reader = new BufferedReader(new InputStreamReader(in));
String line=null;
while((line = reader.readLine())!=null){
buffer.append(line);
}
}catch(Exception e){
e.printStackTrace();
}finally{
if(null!=reader){
try {
reader.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return buffer.toString();
}
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第二个，是response消息返回给微信平台，我尝试的用最一般的out.print去做，但是发现没反应，观察PHP的代码写法
echo "";
exit;
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猜想可能需要有个刷新的操作才能把消息response回去，于是找了下response内的一些函数做出以下尝试
//向请求端发送返回数据
public void print(String content){
try{
final_response.getWriter().print(content);
final_response.getWriter().flush();
final_response.getWriter().close();
}catch(Exception e){

}
}
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关于微信公众平台的消息接口的详细介绍，可以参看微信公众平台的官方文档，里面介绍了消息的xml的格式和消息的发送方式等。