XMLParse.java
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/**
* 对公众平台发送给公众账号的消息加解密示例代码.
*
* @copyright Copyright (c) 1998-2014 Tencent Inc.
*/
// ------------------------------------------------------------------------
package com.hotent.system.encode;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import java.io.StringReader;
/**
* XMLParse class
*
* 提供提取消息格式中的密文及生成回复消息格式的接口.
*/
class XMLParse {
/**
* 提取出xml数据包中的加密消息
* @param xmltext 待提取的xml字符串
* @return 提取出的加密消息字符串
* @throws AesException
*/
public static Object[] extract(String xmltext) throws AesException {
Object[] result = new Object[3];
try {
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
StringReader sr = new StringReader(xmltext);
InputSource is = new InputSource(sr);
Document document = db.parse(is);
Element root = document.getDocumentElement();
NodeList nodelist1 = root.getElementsByTagName("Encrypt");
NodeList nodelist2 = root.getElementsByTagName("ToUserName");
result[0] = 0;
result[1] = nodelist1.item(0).getTextContent();
result[2] = nodelist2.item(0).getTextContent();
return result;
} catch (Exception e) {
e.printStackTrace();
throw new AesException(AesException.ParseXmlError);
}
}
/**
* 生成xml消息
* @param encrypt 加密后的消息密文
* @param signature 安全签名
* @param timestamp 时间戳
* @param nonce 随机字符串
* @return 生成的xml字符串
*/
public static String generate(String encrypt, String signature, String timestamp, String nonce) {
String format = "<xml>\n" + "<Encrypt><![CDATA[%1$s]]></Encrypt>\n"
+ "<MsgSignature><![CDATA[%2$s]]></MsgSignature>\n"
+ "<TimeStamp>%3$s</TimeStamp>\n" + "<Nonce><![CDATA[%4$s]]></Nonce>\n" + "</xml>";
return String.format(format, encrypt, signature, timestamp, nonce);
}
}