微信小程序登录（基于java后台）

//调用微信的登录接口
wx.login({
success:function(r){
//获取到微信的登录凭证code
var code = r.code
if(code){
//调用微信的用户信息接口
wx.getUserInfo({
success:function(res){
console.log({encryptedData: res.encryptedData, iv: res.iv, code: code}),
//请求自己的服务器,解密用户信息，获取unionId
wx.request({
url:'服务器登录接口',
method:'post',//get,del
herder:{
'content-type': 'application/x-www-form-urlencoded'
},
//请求的参数data
data: {encryptedData: res.encryptedData, iv: res.iv, code: code},
success:function(data){
//判断是否解密成功
if(data.data.status==1){
var userInfo_=data.data.userInfo;
console.log(userInfo_)
}esle{
conlose.log('解密失败')
}
},
fail:function(){
conlose.log('系统错误')
}
})

},
fail:function(){
console.log("获取用户信息失败")
}
})
}else{
console.log("获取用户登录状态失败"+r.errmsg)
}
},
fail:function(){
callback(false)
}
})

//需要一个工具类来进行加解密
package com.login.util;

import org.apache.commons.codec.binary.Base64;
import org.bouncycastle.jce.provider.BouncyCastleProvider;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.io.UnsupportedEncodingException;
import java.security.*;
import java.security.spec.InvalidParameterSpecException;

/**
* Created by yfs on 2017/2/6.
* <p>
* AES-128-CBC 加密方式 注： AES-128-CBC可以自己定义“密钥”和“偏移量“。 AES-128是jdk自动生成的“密钥”。
*/
public class AesCbcUtil {

static {
// BouncyCastle是一个开源的加解密解决方案，主页在http://www.bouncycastle.org/
// 需要在pom定义版本
/*
* <dependency> <groupId>org.bouncycastle</groupId>
* <artifactId>bcprov-jdk16</artifactId> <version>1.46</version>
* </dependency>
*
*/
Security.addProvider(new BouncyCastleProvider());
}

/**
* AES解密
*
* @param data
*            //密文，被加密的数据
* @param key
*            //秘钥
* @param iv
*            //偏移量
* @param encodingFormat
*            //解密后的结果需要进行的编码
* @return
* @throws Exception
*/
public static String decrypt(String data, String key, String iv, String encodingFormat) throws Exception {
// initialize();

// 被加密的数据
byte[] dataByte = Base64.decodeBase64(data);
// 加密秘钥
byte[] keyByte = Base64.decodeBase64(key);
// 偏移量
byte[] ivByte = Base64.decodeBase64(iv);

try {
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding");

SecretKeySpec spec = new SecretKeySpec(keyByte, "AES");

AlgorithmParameters parameters = AlgorithmParameters.getInstance("AES");
parameters.init(new IvParameterSpec(ivByte));

cipher.init(Cipher.DECRYPT_MODE, spec, parameters);// 初始化

byte[] resultByte = cipher.doFinal(dataByte);
if (null != resultByte && resultByte.length > 0) {
String result = new String(resultByte, encodingFormat);
return result;
}
return null;
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (NoSuchPaddingException e) {
e.printStackTrace();
} catch (InvalidParameterSpecException e) {
e.printStackTrace();
} catch (InvalidKeyException e) {
e.printStackTrace();
} catch (InvalidAlgorithmParameterException e) {
e.printStackTrace();
} catch (IllegalBlockSizeException e) {
e.printStackTrace();
} catch (BadPaddingException e) {
e.printStackTrace();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}

return null;
}

}

//登录接口实现
package cn.guddqs.wxmini.controller;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.URLConnection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.servlet.http.HttpSession;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import com.login.util.AesCbcUtil;

import cn.guddqs.wxmini.entity.User;
import net.sf.json.JSONObject;

@Controller
public class LoginController {
public static String GETlogin(String u) {
String result = "";
BufferedReader in = null;

try {

URL realUrl = new URL(u);
URLConnection connection = realUrl.openConnection();
// 设置通用的请求属性
connection.setRequestProperty("accept", "*/*");
connection.setRequestProperty("connection", "Keep-Alive");
connection.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
connection.connect();

Map<String, List<String>> map = connection.getHeaderFields();
// 遍历所有的响应头字段
for (String key : map.keySet()) {
System.out.println(key + "--->" + map.get(key));
}

in = new BufferedReader(new InputStreamReader(connection.getInputStream()));

String line;
while ((line = in.readLine()) != null) {
result += line;
}
} catch (Exception e) {
System.out.println("发送GET请求失败");
e.printStackTrace();
} finally {
try {
if (in != null) {
in.close();

}
} catch (Exception e2) {
e2.printStackTrace();
}
}

return result;

}

@ResponseBody
@RequestMapping("/login")
public Map<String, String> addr_getList(String encryptedData, String iv, String code) {

Map map = new HashMap<>();

if (code == null || code.length() == 0) {

map.put("status", 0);
map.put("msg", "code是空的");
// System.out.println("code" + code);
return map;
}

System.out.println(code);
String wxappid = "**********************";
String wxSecret = "***************************";
String grant_type = "authorization_code";

String u = "https://api.weixin.qq.com/sns/jscode2session?" + "appid=" + wxappid + "&secret=" + wxSecret
+ "&js_code=" + code + "&grant_type=" + grant_type;
;
String s = LoginController.GETlogin(u);
//将这个拼接出来的url打印出来看一下
System.out.println(u);

JSONObject json = JSONObject.fromObject(s);

System.out.println("这里是openid和session_key" + json);
String session_key = (String) json.get("session_key");
String openid = (String) json.get("openid");

try {
System.out.println("进入解密成功程序");
String result = AesCbcUtil.decrypt(encryptedData, session_key, iv, "utf-8");
//JSONObject jsonObject = JSONObject.fromObject(result);
System.out.println(result.length()+"wdsaxsadsadsadsa");
if (null != result && result.length() > 0) {
map.put("status", 1);
map.put("msg", "解密成功");
HashMap userinfo = new HashMap<>();
userinfo.put("openid", json.get("openid"));
userinfo.put("session_key", json.get("session_key"));
map.put("userInfo", userinfo);
}

} catch (Exception e) {
System.out.println("解密失败");
}

return map;

}

}

/**
*   基于java ssm框架，需要的jar包可以在网上找到
*/