手把手教您开发JAVA微信SDK-发送消息

大家好，今天我给大家带来的是微信开发之发送消息。

用户关注微信号，那么肯定是为了得到某种功能，假如用户发送文本信息“电话”，我们能给用户发送我的联系电话，这样是不是很友好呢？

好，昨天我们已经接受到了用户发送的信息，今天我们就对用户进行回复消息吧！

首先，回复消息有6个种类：

1 回复文本消息

2 回复图片消息

3 回复语音消息

4 回复视频消息

5 回复音乐消息

6 回复图文消息

我们先来做一个简单的回复文本消息的例子吧！

回复文本消息

<xml>
<ToUserName><![CDATA[toUser]]></ToUserName>
<FromUserName><![CDATA[fromUser]]></FromUserName>
<CreateTime>12345678</CreateTime>
<MsgType><![CDATA[text]]></MsgType>
<Content><![CDATA[你好]]></Content>
</xml>

1.新建发送消息基本对象com.ansitech.weixin.sdk.message.OutputMessage.java

/*
* 微信公众平台(JAVA) SDK
*
* Copyright (c) 2014, Ansitech Network Technology Co.,Ltd All rights reserved.
* http://www.ansitech.com/weixin/sdk/ *
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*      http://www.apache.org/licenses/LICENSE-2.0 *
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.ansitech.weixin.sdk.message;

/**
* 微信发送被动响应消息的抽象类
*
* <p>应用程序需要定义一个子类，来实现具体方法</p>
*
* @author qsyang<yangqisheng274@163.com>
*/
public abstract class OutputMessage implements java.io.Serializable {

/**
* 接收方帐号（收到的OpenID）
*/
private String ToUserName;
/**
* 开发者微信号
*/
private String FromUserName;
/**
* 消息创建时间 （整型）
*/
private Long CreateTime;

/**
* 获取 接收方帐号（收到的OpenID）
*
* @return 接收方帐号（收到的OpenID）
*/
public String getToUserName() {
return ToUserName;
}

/**
* 设置 接收方帐号（收到的OpenID）
*
* @return 接收方帐号（收到的OpenID）
*/
public String getFromUserName() {
return FromUserName;
}

/**
* 获取 消息创建时间 （整型）
*
* @return 消息创建时间 （整型）
*/
public Long getCreateTime() {
return CreateTime;
}

/**
* 获取 消息类型
*
* @return 消息类型
*/
public abstract String getMsgType();
}

2.新建文本消息发送对象com.ansitech.weixin.sdk.message.TextOutputMessage.java

/*
* 微信公众平台(JAVA) SDK
*
* Copyright (c) 2014, Ansitech Network Technology Co.,Ltd All rights reserved.
* http://www.ansitech.com/weixin/sdk/ *
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*      http://www.apache.org/licenses/LICENSE-2.0 *
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.ansitech.weixin.sdk.message;

/**
* 这个类实现了<tt>OutputMessage</tt>，用来回复文本消息
*
* <p>提供了获取文本内容<code>getContent()</code>等主要方法.</p>
*
* @author qsyang<yangqisheng274@163.com>
*/
public class TextOutputMessage extends OutputMessage {

/**
* 消息类型:文本消息
*/
private String MsgType = "text";
/**
* 文本消息
*/
private String Content;

/**
* 创建一个新的 Output Message.并且MsgType的值为text.
*/
public TextOutputMessage() {
}

/**
* 创建一个自定义文本内容content的Output Message.
*
* @param content 文本内容
*/
public TextOutputMessage(String content) {
Content = content;
}

/**
* 获取 消息类型
*
* @return 消息类型
*/
@Override
public String getMsgType() {
return MsgType;
}

/**
* 获取 文本消息
*
* @return 文本消息
*/
public String getContent() {
return Content;
}

/**
* 设置 文本消息
*
* @param content 文本消息
*/
public void setContent(String content) {
Content = content;
}
}

3.修改com.ansitech.weixin.sdk.WeixinUrlFilter.java中接受文本消息部分代码。

package com.ansitech.weixin.sdk;

import com.ansitech.weixin.sdk.message.InputMessage;
import com.ansitech.weixin.sdk.message.MsgType;
import com.ansitech.weixin.sdk.message.OutputMessage;
import com.ansitech.weixin.sdk.message.TextOutputMessage;
import com.ansitech.weixin.sdk.util.SHA1;
import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.core.util.QuickWriter;
import com.thoughtworks.xstream.io.HierarchicalStreamWriter;
import com.thoughtworks.xstream.io.xml.DomDriver;
import com.thoughtworks.xstream.io.xml.PrettyPrintWriter;
import com.thoughtworks.xstream.io.xml.XppDriver;
...

public class WeixinUrlFilter implements Filter {

...

@Override
public void doFilter(ServletRequest req, ServletResponse res,
FilterChain chain) throws IOException, ServletException {
HttpServletRequest request = (HttpServletRequest) req;
HttpServletResponse response = (HttpServletResponse) res;
...
if (isGet) {
...
} else {
...
//根据消息类型获取对应的消息内容
if (msgType.equals(MsgType.Text.toString())) {
try {
//文本消息
System.out.println("开发者微信号：" + inputMsg.getToUserName());
System.out.println("发送方帐号：" + inputMsg.getFromUserName());
System.out.println("消息创建时间：" + inputMsg.getCreateTime());
System.out.println("消息内容：" + inputMsg.getContent());
System.out.println("消息Id：" + inputMsg.getMsgId());
//发送文本消息 start
XStream xstream = new XStream(new XppDriver() {
@Override
public HierarchicalStreamWriter createWriter(Writer out) {
return new PrettyPrintWriter(out) {
@Override
protected void writeText(QuickWriter writer,
String text) {
if (!text.startsWith("<![CDATA[")) {
text = "<![CDATA[" + text + "]]>";
}
writer.write(text);
}
};
}
});
//创建文本发送消息对象
TextOutputMessage outputMsg = new TextOutputMessage();
outputMsg.setContent("你的消息已经收到，谢谢！");
setOutputMsgInfo(outputMsg, inputMsg);
//设置对象转换的XML根节点为xml
xstream.alias("xml", outputMsg.getClass());
//将对象转换为XML字符串
String xml = xstream.toXML(outputMsg);
//将内容发送给微信服务器，发送到用户手机
response.getWriter().write(xml);
} catch (Exception ex) {
System.out.println("消息接受和发送出现异常!");
ex.printStackTrace();
}
}
}
}

//设置详细信息
private static void setOutputMsgInfo(OutputMessage oms,
InputMessage msg) throws Exception {
// 设置发送信息
Class<?> outMsg = oms.getClass().getSuperclass();
Field CreateTime = outMsg.getDeclaredField("CreateTime");
Field ToUserName = outMsg.getDeclaredField("ToUserName");
Field FromUserName = outMsg.getDeclaredField("FromUserName");

ToUserName.setAccessible(true);
CreateTime.setAccessible(true);
FromUserName.setAccessible(true);

CreateTime.set(oms, new Date().getTime());
ToUserName.set(oms, msg.getFromUserName());
FromUserName.set(oms, msg.getToUserName());
}

...
}

以上代码给出了发送消息的部分，“...”的部分请参考我的上俩篇文章。

如有疑问，请留言。

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