<xml>
  <ToUserName><![CDATA[toUser]]></ToUserName>
  <FromUserName><![CDATA[fromUser]]></FromUserName>
  <CreateTime>1348831860</CreateTime>
  <MsgType><![CDATA[text]]></MsgType>
  <Content><![CDATA[this is a test]]></Content>
  <MsgId>1234567890123456</MsgId>
</xml>

所以我们要对消息进行解析，这里我写了一个简单的方法用来解析xml的数据

/**
 * 通过反射的方式，将xml数据封装到对应的实体里面去
 * @param xmlString xml的字符串
 * @param t 返回值类型
 */
public T Wxformat(String xmlString,T t){

    if (xmlString.length() < 10){
        throw new RuntimeException("错误的xml");
    }
    // 对于一般的XML解析不需要这两行，但是微信的消息都是使用前后缀，所以这里多做一步
    xmlString = xmlString.replace("<![CDATA[", "");
    xmlString = xmlString.replace("]]>","");

    xmlString = xmlString.substring(5,xmlString.length()-6);
    Map<String,Object> map = new HashMap<String, Object>();
    char[] chars = xmlString.toCharArray();
    StringBuilder curFiled = new StringBuilder();
    StringBuilder curContent = new StringBuilder();
    int flag = 0;
    for (int i = 0;i < chars.length; i++){
        if (chars[i] == '<' && flag != 1){
            continue;
        }
        if (chars[i] != '>' && flag != 1){
            curFiled.append(chars[i]);
            continue;
        }else if (flag != 1){
            flag = 1;
            continue;
        }

        if (flag == 1 && chars[i] != '<'){
            curContent.append(chars[i]);
            continue;
        }
        if (flag == 1 && chars[i] == '<'){
            map.put(curFiled.toString(), curContent.toString());
            i += curFiled.length() + 2;
            curFiled.delete(0,curFiled.length());
            curContent.delete(0, curContent.length());
            flag = 0;
        }
    }
    try {
        Class<?> aClass = t.getClass();
        for (String key : map.keySet()){
            Method method = aClass.getMethod("set" + key, String.class);
            method.invoke(t, map.get(key));
        }
    }catch (Exception e){

    }
    return t;
}