在微信支付统一下单接口文档中，请求体body和微信端返回值都是xml格式的内容。
例如：
<xml>
<appid>wx2421b1c4370ec43bappid>
<attach>支付测试attach>
<body>JSAPI支付测试body>
<mch_id>10000100mch_id>
<detail>detail>
<nonce_str>1add1a30ac87aa2db72f57a2375d8fecnonce_str>
<notify_url>https://wxpay.wxutil.com/pub_v2/pay/notify.v2.phpnotify_url>
<openid>oUpF8uMuAJO_M2pxb1Q9zNjWeS6oopenid>
<out_trade_no>1415659990out_trade_no>
<spbill_create_ip>14.23.150.211spbill_create_ip>
<total_fee>1total_fee>
<trade_type>JSAPItrade_type>
<sign>0CB01533B8C1EF103065174F50BCA001sign>
xml>
<xml>
<return_code>return_code>
<return_msg>return_msg>
<appid>appid>
<mch_id>mch_id>
<nonce_str>nonce_str>
<openid>openid>
<sign>sign>
<result_code>result_code>
<prepay_id>prepay_id>
<trade_type>trade_type>
xml>
面向对象的开发过程中，最好是实现持久的转化层，便于XML请求内容与JAVA类的双向转化。
此时就可以使用simpleframework。例如使用simpleframework简单的解析XML文件等案例。
要实现JAVA类与微信支付下单请求的XML类型双向转化，包括3个步骤：
1、 构造映射文件
2、编写XML工具类
3、调用工具类进行转化，实现微信支付的统一下单
import org.simpleframework.xml.Element;
import org.simpleframework.xml.Root;
@Root(
name = "xml",
strict = false
)
public class WxPayUnifiedorderRequest {
@Element(
name = "appid"
)
private String appid;
@Element(
name = "mch_id"
)
private String mchId;
@Element(
name = "nonce_str"
)
private String nonceStr;
@Element(
name = "sign"
)
private String sign;
@Element(
name = "attach",
required = false
)
private String attach;
@Element(
name = "body",
required = false
)
private String body;
@Element(
name = "detail",
required = false
)
private String detail;
@Element(
name = "notify_url"
)
private String notifyUrl;
@Element(
name = "openid",
required = false
)
private String openid;
@Element(
name = "out_trade_no"
)
private String outTradeNo;
@Element(
name = "spbill_create_ip"
)
private String spbillCreateIp;
@Element(
name = "total_fee"
)
private Integer totalFee;
@Element(
name = "trade_type"
)
private String tradeType;
public WxPayUnifiedorderRequest() {
}
public String getAppid() {
return this.appid;
}
public String getMchId() {
return this.mchId;
}
public String getNonceStr() {
return this.nonceStr;
}
public String getSign() {
return this.sign;
}
public String getAttach() {
return this.attach;
}
public String getBody() {
return this.body;
}
public String getDetail() {
return this.detail;
}
public String getNotifyUrl() {
return this.notifyUrl;
}
public String getOpenid() {
return this.openid;
}
public String getOutTradeNo() {
return this.outTradeNo;
}
public String getSpbillCreateIp() {
return this.spbillCreateIp;
}
public Integer getTotalFee() {
return this.totalFee;
}
public String getTradeType() {
return this.tradeType;
}
public void setAppid(String appid) {
this.appid = appid;
}
public void setMchId(String mchId) {
this.mchId = mchId;
}
public void setNonceStr(String nonceStr) {
this.nonceStr = nonceStr;
}
public void setSign(String sign) {
this.sign = sign;
}
public void setAttach(String attach) {
this.attach = attach;
}
public void setBody(String body) {
this.body = body;
}
public void setDetail(String detail) {
this.detail = detail;
}
public void setNotifyUrl(String notifyUrl) {
this.notifyUrl = notifyUrl;
}
public void setOpenid(String openid) {
this.openid = openid;
}
public void setOutTradeNo(String outTradeNo) {
this.outTradeNo = outTradeNo;
}
public void setSpbillCreateIp(String spbillCreateIp) {
this.spbillCreateIp = spbillCreateIp;
}
public void setTotalFee(Integer totalFee) {
this.totalFee = totalFee;
}
public void setTradeType(String tradeType) {
this.tradeType = tradeType;
}
public boolean equals(Object o) {
if (o == this) {
return true;
} else if (!(o instanceof WxPayUnifiedorderRequest)) {
return false;
} else {
WxPayUnifiedorderRequest other = (WxPayUnifiedorderRequest)o;
if (!other.canEqual(this)) {
return false;
} else {
label167: {
Object this$appid = this.getAppid();
Object other$appid = other.getAppid();
if (this$appid == null) {
if (other$appid == null) {
break label167;
}
} else if (this$appid.equals(other$appid)) {
break label167;
}
return false;
}
Object this$mchId = this.getMchId();
Object other$mchId = other.getMchId();
if (this$mchId == null) {
if (other$mchId != null) {
return false;
}
} else if (!this$mchId.equals(other$mchId)) {
return false;
}
label153: {
Object this$nonceStr = this.getNonceStr();
Object other$nonceStr = other.getNonceStr();
if (this$nonceStr == null) {
if (other$nonceStr == null) {
break label153;
}
} else if (this$nonceStr.equals(other$nonceStr)) {
break label153;
}
return false;
}
Object this$sign = this.getSign();
Object other$sign = other.getSign();
if (this$sign == null) {
if (other$sign != null) {
return false;
}
} else if (!this$sign.equals(other$sign)) {
return false;
}
label139: {
Object this$attach = this.getAttach();
Object other$attach = other.getAttach();
if (this$attach == null) {
if (other$attach == null) {
break label139;
}
} else if (this$attach.equals(other$attach)) {
break label139;
}
return false;
}
Object this$body = this.getBody();
Object other$body = other.getBody();
if (this$body == null) {
if (other$body != null) {
return false;
}
} else if (!this$body.equals(other$body)) {
return false;
}
label125: {
Object this$detail = this.getDetail();
Object other$detail = other.getDetail();
if (this$detail == null) {
if (other$detail == null) {
break label125;
}
} else if (this$detail.equals(other$detail)) {
break label125;
}
return false;
}
label118: {
Object this$notifyUrl = this.getNotifyUrl();
Object other$notifyUrl = other.getNotifyUrl();
if (this$notifyUrl == null) {
if (other$notifyUrl == null) {
break label118;
}
} else if (this$notifyUrl.equals(other$notifyUrl)) {
break label118;
}
return false;
}
Object this$openid = this.getOpenid();
Object other$openid = other.getOpenid();
if (this$openid == null) {
if (other$openid != null) {
return false;
}
} else if (!this$openid.equals(other$openid)) {
return false;
}
label104: {
Object this$outTradeNo = this.getOutTradeNo();
Object other$outTradeNo = other.getOutTradeNo();
if (this$outTradeNo == null) {
if (other$outTradeNo == null) {
break label104;
}
} else if (this$outTradeNo.equals(other$outTradeNo)) {
break label104;
}
return false;
}
label97: {
Object this$spbillCreateIp = this.getSpbillCreateIp();
Object other$spbillCreateIp = other.getSpbillCreateIp();
if (this$spbillCreateIp == null) {
if (other$spbillCreateIp == null) {
break label97;
}
} else if (this$spbillCreateIp.equals(other$spbillCreateIp)) {
break label97;
}
return false;
}
Object this$totalFee = this.getTotalFee();
Object other$totalFee = other.getTotalFee();
if (this$totalFee == null) {
if (other$totalFee != null) {
return false;
}
} else if (!this$totalFee.equals(other$totalFee)) {
return false;
}
Object this$tradeType = this.getTradeType();
Object other$tradeType = other.getTradeType();
if (this$tradeType == null) {
if (other$tradeType != null) {
return false;
}
} else if (!this$tradeType.equals(other$tradeType)) {
return false;
}
return true;
}
}
}
protected boolean canEqual(Object other) {
return other instanceof WxPayUnifiedorderRequest;
}
public int hashCode() {
int PRIME = true;
int result = 1;
Object $appid = this.getAppid();
int result = result * 59 + ($appid == null ? 43 : $appid.hashCode());
Object $mchId = this.getMchId();
result = result * 59 + ($mchId == null ? 43 : $mchId.hashCode());
Object $nonceStr = this.getNonceStr();
result = result * 59 + ($nonceStr == null ? 43 : $nonceStr.hashCode());
Object $sign = this.getSign();
result = result * 59 + ($sign == null ? 43 : $sign.hashCode());
Object $attach = this.getAttach();
result = result * 59 + ($attach == null ? 43 : $attach.hashCode());
Object $body = this.getBody();
result = result * 59 + ($body == null ? 43 : $body.hashCode());
Object $detail = this.getDetail();
result = result * 59 + ($detail == null ? 43 : $detail.hashCode());
Object $notifyUrl = this.getNotifyUrl();
result = result * 59 + ($notifyUrl == null ? 43 : $notifyUrl.hashCode());
Object $openid = this.getOpenid();
result = result * 59 + ($openid == null ? 43 : $openid.hashCode());
Object $outTradeNo = this.getOutTradeNo();
result = result * 59 + ($outTradeNo == null ? 43 : $outTradeNo.hashCode());
Object $spbillCreateIp = this.getSpbillCreateIp();
result = result * 59 + ($spbillCreateIp == null ? 43 : $spbillCreateIp.hashCode());
Object $totalFee = this.getTotalFee();
result = result * 59 + ($totalFee == null ? 43 : $totalFee.hashCode());
Object $tradeType = this.getTradeType();
result = result * 59 + ($tradeType == null ? 43 : $tradeType.hashCode());
return result;
}
public String toString() {
return "WxPayUnifiedorderRequest(appid=" + this.getAppid() + ", mchId=" + this.getMchId() + ", nonceStr=" + this.getNonceStr() + ", sign=" + this.getSign() + ", attach=" + this.getAttach() + ", body=" + this.getBody() + ", detail=" + this.getDetail() + ", notifyUrl=" + this.getNotifyUrl() + ", openid=" + this.getOpenid() + ", outTradeNo=" + this.getOutTradeNo() + ", spbillCreateIp=" + this.getSpbillCreateIp() + ", totalFee=" + this.getTotalFee() + ", tradeType=" + this.getTradeType() + ")";
}
}
//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by Fernflower decompiler)
//
package com.lly835.bestpay.model.wxpay.response;
import org.simpleframework.xml.Element;
import org.simpleframework.xml.Root;
@Root(
name = "xml",
strict = false
)
public class WxPaySyncResponse {
@Element(
name = "return_code"
)
private String returnCode;
@Element(
name = "return_msg",
required = false
)
private String returnMsg;
@Element(
name = "appid",
required = false
)
private String appid;
@Element(
name = "mch_id",
required = false
)
private String mchId;
@Element(
name = "device_info",
required = false
)
private String deviceInfo;
@Element(
name = "nonce_str",
required = false
)
private String nonceStr;
@Element(
name = "sign",
required = false
)
private String sign;
@Element(
name = "result_code",
required = false
)
private String resultCode;
@Element(
name = "err_code",
required = false
)
private String errCode;
@Element(
name = "err_code_des",
required = false
)
private String errCodeDes;
@Element(
name = "trade_type",
required = false
)
private String tradeType;
@Element(
name = "prepay_id",
required = false
)
private String prepayId;
@Element(
name = "code_url",
required = false
)
private String codeUrl;
@Element(
name = "mweb_url",
required = false
)
private String mwebUrl;
public WxPaySyncResponse() {
}
public String getReturnCode() {
return this.returnCode;
}
public String getReturnMsg() {
return this.returnMsg;
}
public String getAppid() {
return this.appid;
}
public String getMchId() {
return this.mchId;
}
public String getDeviceInfo() {
return this.deviceInfo;
}
public String getNonceStr() {
return this.nonceStr;
}
public String getSign() {
return this.sign;
}
public String getResultCode() {
return this.resultCode;
}
public String getErrCode() {
return this.errCode;
}
public String getErrCodeDes() {
return this.errCodeDes;
}
public String getTradeType() {
return this.tradeType;
}
public String getPrepayId() {
return this.prepayId;
}
public String getCodeUrl() {
return this.codeUrl;
}
public String getMwebUrl() {
return this.mwebUrl;
}
public void setReturnCode(String returnCode) {
this.returnCode = returnCode;
}
public void setReturnMsg(String returnMsg) {
this.returnMsg = returnMsg;
}
public void setAppid(String appid) {
this.appid = appid;
}
public void setMchId(String mchId) {
this.mchId = mchId;
}
public void setDeviceInfo(String deviceInfo) {
this.deviceInfo = deviceInfo;
}
public void setNonceStr(String nonceStr) {
this.nonceStr = nonceStr;
}
public void setSign(String sign) {
this.sign = sign;
}
public void setResultCode(String resultCode) {
this.resultCode = resultCode;
}
public void setErrCode(String errCode) {
this.errCode = errCode;
}
public void setErrCodeDes(String errCodeDes) {
this.errCodeDes = errCodeDes;
}
public void setTradeType(String tradeType) {
this.tradeType = tradeType;
}
public void setPrepayId(String prepayId) {
this.prepayId = prepayId;
}
public void setCodeUrl(String codeUrl) {
this.codeUrl = codeUrl;
}
public void setMwebUrl(String mwebUrl) {
this.mwebUrl = mwebUrl;
}
public boolean equals(Object o) {
if (o == this) {
return true;
} else if (!(o instanceof WxPaySyncResponse)) {
return false;
} else {
WxPaySyncResponse other = (WxPaySyncResponse)o;
if (!other.canEqual(this)) {
return false;
} else {
Object this$returnCode = this.getReturnCode();
Object other$returnCode = other.getReturnCode();
if (this$returnCode == null) {
if (other$returnCode != null) {
return false;
}
} else if (!this$returnCode.equals(other$returnCode)) {
return false;
}
Object this$returnMsg = this.getReturnMsg();
Object other$returnMsg = other.getReturnMsg();
if (this$returnMsg == null) {
if (other$returnMsg != null) {
return false;
}
} else if (!this$returnMsg.equals(other$returnMsg)) {
return false;
}
Object this$appid = this.getAppid();
Object other$appid = other.getAppid();
if (this$appid == null) {
if (other$appid != null) {
return false;
}
} else if (!this$appid.equals(other$appid)) {
return false;
}
label158: {
Object this$mchId = this.getMchId();
Object other$mchId = other.getMchId();
if (this$mchId == null) {
if (other$mchId == null) {
break label158;
}
} else if (this$mchId.equals(other$mchId)) {
break label158;
}
return false;
}
label151: {
Object this$deviceInfo = this.getDeviceInfo();
Object other$deviceInfo = other.getDeviceInfo();
if (this$deviceInfo == null) {
if (other$deviceInfo == null) {
break label151;
}
} else if (this$deviceInfo.equals(other$deviceInfo)) {
break label151;
}
return false;
}
Object this$nonceStr = this.getNonceStr();
Object other$nonceStr = other.getNonceStr();
if (this$nonceStr == null) {
if (other$nonceStr != null) {
return false;
}
} else if (!this$nonceStr.equals(other$nonceStr)) {
return false;
}
label137: {
Object this$sign = this.getSign();
Object other$sign = other.getSign();
if (this$sign == null) {
if (other$sign == null) {
break label137;
}
} else if (this$sign.equals(other$sign)) {
break label137;
}
return false;
}
label130: {
Object this$resultCode = this.getResultCode();
Object other$resultCode = other.getResultCode();
if (this$resultCode == null) {
if (other$resultCode == null) {
break label130;
}
} else if (this$resultCode.equals(other$resultCode)) {
break label130;
}
return false;
}
Object this$errCode = this.getErrCode();
Object other$errCode = other.getErrCode();
if (this$errCode == null) {
if (other$errCode != null) {
return false;
}
} else if (!this$errCode.equals(other$errCode)) {
return false;
}
Object this$errCodeDes = this.getErrCodeDes();
Object other$errCodeDes = other.getErrCodeDes();
if (this$errCodeDes == null) {
if (other$errCodeDes != null) {
return false;
}
} else if (!this$errCodeDes.equals(other$errCodeDes)) {
return false;
}
label109: {
Object this$tradeType = this.getTradeType();
Object other$tradeType = other.getTradeType();
if (this$tradeType == null) {
if (other$tradeType == null) {
break label109;
}
} else if (this$tradeType.equals(other$tradeType)) {
break label109;
}
return false;
}
label102: {
Object this$prepayId = this.getPrepayId();
Object other$prepayId = other.getPrepayId();
if (this$prepayId == null) {
if (other$prepayId == null) {
break label102;
}
} else if (this$prepayId.equals(other$prepayId)) {
break label102;
}
return false;
}
Object this$codeUrl = this.getCodeUrl();
Object other$codeUrl = other.getCodeUrl();
if (this$codeUrl == null) {
if (other$codeUrl != null) {
return false;
}
} else if (!this$codeUrl.equals(other$codeUrl)) {
return false;
}
Object this$mwebUrl = this.getMwebUrl();
Object other$mwebUrl = other.getMwebUrl();
if (this$mwebUrl == null) {
if (other$mwebUrl != null) {
return false;
}
} else if (!this$mwebUrl.equals(other$mwebUrl)) {
return false;
}
return true;
}
}
}
protected boolean canEqual(Object other) {
return other instanceof WxPaySyncResponse;
}
public int hashCode() {
int PRIME = true;
int result = 1;
Object $returnCode = this.getReturnCode();
int result = result * 59 + ($returnCode == null ? 43 : $returnCode.hashCode());
Object $returnMsg = this.getReturnMsg();
result = result * 59 + ($returnMsg == null ? 43 : $returnMsg.hashCode());
Object $appid = this.getAppid();
result = result * 59 + ($appid == null ? 43 : $appid.hashCode());
Object $mchId = this.getMchId();
result = result * 59 + ($mchId == null ? 43 : $mchId.hashCode());
Object $deviceInfo = this.getDeviceInfo();
result = result * 59 + ($deviceInfo == null ? 43 : $deviceInfo.hashCode());
Object $nonceStr = this.getNonceStr();
result = result * 59 + ($nonceStr == null ? 43 : $nonceStr.hashCode());
Object $sign = this.getSign();
result = result * 59 + ($sign == null ? 43 : $sign.hashCode());
Object $resultCode = this.getResultCode();
result = result * 59 + ($resultCode == null ? 43 : $resultCode.hashCode());
Object $errCode = this.getErrCode();
result = result * 59 + ($errCode == null ? 43 : $errCode.hashCode());
Object $errCodeDes = this.getErrCodeDes();
result = result * 59 + ($errCodeDes == null ? 43 : $errCodeDes.hashCode());
Object $tradeType = this.getTradeType();
result = result * 59 + ($tradeType == null ? 43 : $tradeType.hashCode());
Object $prepayId = this.getPrepayId();
result = result * 59 + ($prepayId == null ? 43 : $prepayId.hashCode());
Object $codeUrl = this.getCodeUrl();
result = result * 59 + ($codeUrl == null ? 43 : $codeUrl.hashCode());
Object $mwebUrl = this.getMwebUrl();
result = result * 59 + ($mwebUrl == null ? 43 : $mwebUrl.hashCode());
return result;
}
public String toString() {
return "WxPaySyncResponse(returnCode=" + this.getReturnCode() + ", returnMsg=" + this.getReturnMsg() + ", appid=" + this.getAppid() + ", mchId=" + this.getMchId() + ", deviceInfo=" + this.getDeviceInfo() + ", nonceStr=" + this.getNonceStr() + ", sign=" + this.getSign() + ", resultCode=" + this.getResultCode() + ", errCode=" + this.getErrCode() + ", errCodeDes=" + this.getErrCodeDes() + ", tradeType=" + this.getTradeType() + ", prepayId=" + this.getPrepayId() + ", codeUrl=" + this.getCodeUrl() + ", mwebUrl=" + this.getMwebUrl() + ")";
}
}
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.io.StringWriter;
import java.util.HashMap;
import java.util.Map;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.simpleframework.xml.Serializer;
import org.simpleframework.xml.core.Persister;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
public class XmlUtil {
public XmlUtil() {
}
/**
* 将xml转化为java类
**/
public static Object toObject(String xml, Class objClass) {
Persister serializer = new Persister();
try {
return serializer.read(objClass, xml);
} catch (Exception var4) {
var4.printStackTrace();
return null;
}
}
/**
* 将java类转化为xml
**/
public static String toString(Object obj) {
Serializer serializer = new Persister();
StringWriter output = new StringWriter();
try {
serializer.write(obj, output);
} catch (Exception var4) {
var4.printStackTrace();
}
return output.toString();
}
public static Map<String, String> toMap(String strXML) {
try {
Map<String, String> data = new HashMap();
DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();
InputStream stream = new ByteArrayInputStream(strXML.getBytes("UTF-8"));
Document doc = documentBuilder.parse(stream);
doc.getDocumentElement().normalize();
NodeList nodeList = doc.getDocumentElement().getChildNodes();
for(int idx = 0; idx < nodeList.getLength(); ++idx) {
Node node = nodeList.item(idx);
if (node.getNodeType() == 1) {
Element element = (Element)node;
data.put(element.getNodeName(), element.getTextContent());
}
}
try {
stream.close();
} catch (Exception var10) {
}
return data;
} catch (Exception var11) {
var11.printStackTrace();
return null;
}
}
}
public class WxPayServiceImpl {
private static final Logger log = LoggerFactory.getLogger(WxPayServiceImpl.class);
private WxPayConfig wxPayConfig;
private Retrofit retrofit;
public WxPayServiceImpl() {
this.retrofit = (new Builder()).baseUrl("https://api.mch.weixin.qq.com/").addConverterFactory(SimpleXmlConverterFactory.create()).client((new okhttp3.OkHttpClient.Builder()).addInterceptor((new HttpLoggingInterceptor()).setLevel(Level.BODY)).build()).build();
}
public void setWxPayConfig(WxPayConfig wxPayConfig) {
this.wxPayConfig = wxPayConfig;
}
public PayResponse pay(PayRequest request) {
WxPayUnifiedorderRequest wxRequest = new WxPayUnifiedorderRequest();
wxRequest.setOutTradeNo(request.getOrderId());
wxRequest.setTotalFee(MoneyUtil.Yuan2Fen(request.getOrderAmount()));
wxRequest.setBody(request.getOrderName());
wxRequest.setOpenid(request.getOpenid());
wxRequest.setTradeType(request.getPayTypeEnum().getCode());
wxRequest.setAppid(this.wxPayConfig.getAppId());
wxRequest.setMchId(this.wxPayConfig.getMchId());
wxRequest.setNotifyUrl(this.wxPayConfig.getNotifyUrl());
wxRequest.setNonceStr(RandomUtil.getRandomStr());
wxRequest.setSpbillCreateIp(StringUtils.isEmpty(request.getSpbillCreateIp()) ? "8.8.8.8" : request.getSpbillCreateIp());
wxRequest.setAttach(request.getAttach());
wxRequest.setSign(WxPaySignature.sign(MapUtil.buildMap(wxRequest), this.wxPayConfig.getMchKey()));
// XmlUtil.toString(wxRequest))，实现java object--> xml string
RequestBody body = RequestBody.create(MediaType.parse("application/xml; charset=utf-8"), XmlUtil.toString(wxRequest));
Call<WxPaySyncResponse> call = ((WxPayApi)this.retrofit.create(WxPayApi.class)).unifiedorder(body);
Response retrofitResponse = null;
try {
retrofitResponse = call.execute();
} catch (IOException var7) {
var7.printStackTrace();
}
assert retrofitResponse != null;
if (!retrofitResponse.isSuccessful()) {
throw new RuntimeException("【微信统一支付】发起支付, 网络异常");
} else {
//xml string --> java body
WxPaySyncResponse response = (WxPaySyncResponse)retrofitResponse.body();
assert response != null;
if (!response.getReturnCode().equals("SUCCESS")) {
throw new RuntimeException("【微信统一支付】发起支付, returnCode != SUCCESS, returnMsg = " + response.getReturnMsg());
} else if (!response.getResultCode().equals("SUCCESS")) {
throw new RuntimeException("【微信统一支付】发起支付, resultCode != SUCCESS, err_code = " + response.getErrCode() + " err_code_des=" + response.getErrCodeDes());
} else {
return this.buildPayResponse(response);
}
}
}
扩展阅读：
1、hashCode() 重写的要求：https://blog.csdn.net/qq_42777577/article/details/84756170
2、hashCode()重写时的神奇数：https://blog.csdn.net/weixin_43871678/article/details/116654390
3、Retrofit的使用：https://blog.csdn.net/qq_31469369/article/details/109677247
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