一、MD5加密

public class WxUtils {private static final String hexDigits[] = { "0", "1", "2", "3", "4", "5","6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };//获取MessageDigest.digest(str) 后的字节数组(数组长度16  范围-128~127)private static String byteArrayToHexString(byte b[]) {StringBuffer resultSb = new StringBuffer();for (int i = 0; i < b.length; i++)resultSb.append(byteToHexString(b[i]));return resultSb.toString();}//对数组中的每个字节进行计算(返回两个字符，最后组成32位密文)private static String byteToHexString(byte b) {int n = b;if (n < 0)n += 256;int d1 = n / 16;int d2 = n % 16;return hexDigits[d1] + hexDigits[d2];}//主方法public static String MD5Encode(String origin, String charsetname) {String resultString = null;try {resultString = new String(origin);MessageDigest md = MessageDigest.getInstance("MD5");if (charsetname == null || "".equals(charsetname))//执行md.digest(byte []bytes)过程中，会先执行 update,将字符串的bytes数组加入进程 md.digest(bytes) 返回长度为16的字节数组resultString = byteArrayToHexString(md.digest(resultString.getBytes()));elseresultString = byteArrayToHexString(md.digest(resultString.getBytes(charsetname)));} catch (Exception exception) {}return resultString;}public static void main(String args[]){WxUtils.MD5Encode("hello","utf-8");}}

注意：编码格式在没有中文情况下得到的结果是一样的，在有中文的情况下编码格式会影响最后结果，微信sign签名方式为 utf-8 编码格式

二、xml 转 Map/Json (json为例)

package com.wxpay.utils;import net.sf.json.JSONObject;
import org.dom4j.Attribute;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;
import org.springSupport.utils.Md5Util;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.security.MessageDigest;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;public class Test {public JSONObject xmlToMap(Element node) throws DocumentException {JSONObject jsonObject = new JSONObject();System.out.println("节点的名称：" + node.getName());//首先获取当前节点的所有属性节点List<Attribute> list = node.attributes();//遍历属性节点for(Attribute attribute : list){System.out.println("属性"+attribute.getName() +":" + attribute.getValue());}//如果当前节点内容不为空，则输出if(!(node.getTextTrim().equals(""))){System.out.println( node.getName() + "：" + node.getText());jsonObject.put(node.getName(),node.getText());}//同时迭代当前节点下面的所有子节点//使用递归Iterator<Element> iterator = node.elementIterator();while(iterator.hasNext()){Element e = iterator.next();xmlToMap(e);}return jsonObject;}public static void main(String []args) throws DocumentException {//创建SAXReader对象SAXReader reader = new SAXReader();InputStream is = new ByteArrayInputStream("<xml><id>1</id><name>frank</name></xml>".getBytes());//读取文件 转换成DocumentDocument document = reader.read(is);//获取根节点元素对象Element root = document.getRootElement();Test t = new Test();t.xmlToMap(root);}}

输出结果，如图：

三、Map 转 xml

package com.wxpay.utils;import net.sf.json.JSONObject;
import org.apache.commons.lang.StringUtils;
import org.dom4j.Attribute;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;
import org.springSupport.utils.Md5Util;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.security.MessageDigest;
import java.util.*;public class Test {/***  map转成xml* @param parm* @param isAddCDATA* @return*/public String mapToXml(Map<String, String> parm, boolean isAddCDATA) {//首先要对map进行ASCLL码排序ArrayList<Map.Entry<String,String>> arrayList = new ArrayList<>(parm.entrySet());Collections.sort(arrayList, new Comparator<Map.Entry<String, String>>() {@Overridepublic int compare(Map.Entry<String, String> o1, Map.Entry<String, String> o2) {return o1.getKey().compareTo(o2.getKey());}});StringBuffer strbuff = new StringBuffer("<xml>");if (parm != null && !parm.isEmpty()) {for (Map.Entry<String, String> entry : arrayList) {strbuff.append("<").append(entry.getKey()).append(">");if (isAddCDATA) {strbuff.append("<![CDATA[");if (StringUtils.isNotEmpty(entry.getValue())) {strbuff.append(entry.getValue());}strbuff.append("]]>");} else {if (StringUtils.isNotEmpty(entry.getValue())) {strbuff.append(entry.getValue());}}strbuff.append("</").append(entry.getKey()).append(">");}}return strbuff.append("</xml>").toString();}public static void main(String []args) throws DocumentException {Map<String,String> map = new HashMap<>();map.put("appid","11111111111111");map.put("mch_id","222222222222");map.put("body","测试");map.put("sign_type","MD5");Test t = new Test();//是否添加CDATA标签，false为否System.out.println(t.mapToXml(map,false));}}

输出结果，如图