微信支付 MD5加密 、xml转Map/Json 、 Map转xml

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()));
            else
                resultString = 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Document
        Document 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>>() {
            @Override
            public 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