一、Java端
1、搭建一个springboot项目,引入以下pom依赖
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/top.jfunc.common/converter -->
<dependency>
<groupId>top.jfunc.common</groupId>
<artifactId>converter</artifactId>
<version>1.8.0</version>
</dependency>
<dependency>
<groupId>net.sf.json-lib</groupId>
<artifactId>json-lib</artifactId>
<version>2.4</version>
<classifier>jdk15</classifier>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.7.4</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.7.4</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>2.7.4</version>
</dependency>
</dependencies>
2、新建2个工具类 UrlUtil、CreateQrcore
1、UrlUtil //向指定 URL 发送POST方法的请求
package com.example.utils;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.URL;
import java.net.URLConnection;
import java.util.Iterator;
import java.util.Map;
public class UrlUtil {
/**
* 向指定 URL 发送POST方法的请求
*
* @param url 发送请求的 URL
* @return 所代表远程资源的响应结果
*/
public static String sendPost(String url, Map<String, ?> paramMap) {
PrintWriter out = null;
BufferedReader in = null;
String result = "";
String param = "";
Iterator<String> it = paramMap.keySet().iterator();
while(it.hasNext()) {
String key = it.next();
param += key + "=" + paramMap.get(key) + "&";
}
try {
URL realUrl = new URL(url);
// 打开和URL之间的连接
URLConnection conn = realUrl.openConnection();
// 设置通用的请求属性
conn.setRequestProperty("accept", "*/*");
conn.setRequestProperty("connection", "Keep-Alive");
conn.setRequestProperty("Accept-Charset", "utf-8");
conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
// 发送POST请求必须设置如下两行
conn.setDoOutput(true);
conn.setDoInput(true);
// 获取URLConnection对象对应的输出流
out = new PrintWriter(conn.getOutputStream());
// 发送请求参数
out.print(param);
// flush输出流的缓冲
out.flush();
// 定义BufferedReader输入流来读取URL的响应
in = new BufferedReader(new InputStreamReader(conn.getInputStream(), "UTF-8"));
String line;
while ((line = in.readLine()) != null) {
result += line;
}
} catch (Exception e) {
System.out.println(e);
}
//使用finally块来关闭输出流、输入流
finally{
try{
if(out!=null){
out.close();
}
if(in!=null){
in.close();
}
}
catch(Exception ex){
ex.printStackTrace();
}
}
return result;
}
}
2、CreateQrcore 创建二维码 设定二维码的参数、生成后保存的地址等等
paramJson.put("scene","2");//这一句就是你二维码里携带的参数 String型 名称不可变
package com.example.utils;
import net.sf.json.JSONObject;
import javax.servlet.http.HttpServletRequest;
import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.LinkedHashMap;
import java.util.Map;
public class CreateQrcore {
/*
* 获取 token
* 普通的 get 可获 token
*/
public static String getToken() {
try {
Map<String, String> map = new LinkedHashMap<>();
map.put("grant_type", "client_credential");
map.put("appid","xxxxxxxxxxxxxx");
map.put("secret", "xxxxxxxxxxxxxxxxxxxxx");
String rt = UrlUtil.sendPost("https://api.weixin.qq.com/cgi-bin/token", map);
System.out.println("what is:"+rt);
JSONObject json = JSONObject.fromObject(rt);
if (json.getString("access_token") != null || json.getString("access_token") != "") {
return json.getString("access_token");
} else {
return null;
}
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
/*
* 获取 二维码图片
*
*/
public static String getminiqrQr( String accessToken,HttpServletRequest request) {
String p="F://code"; //二维码生产的地址 本地F盘code文件夹
System.out.println(p);
String codeUrl=p+"/twoCode.png";
String twoCodeUrl="twoCode.png";
try
{
URL url = new URL("https://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token="+accessToken);
HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
httpURLConnection.setRequestMethod("POST");// 提交模式
// conn.setConnectTimeout(10000);//连接超时 单位毫秒
// conn.setReadTimeout(2000);//读取超时 单位毫秒
// 发送POST请求必须设置如下两行
httpURLConnection.setDoOutput(true);
httpURLConnection.setDoInput(true);
// 获取URLConnection对象对应的输出流
PrintWriter printWriter = new PrintWriter(httpURLConnection.getOutputStream());
// 发送请求参数
JSONObject paramJson = new JSONObject();
paramJson.put("scene","2");//这就是你二维码里携带的参数 String型 名称不可变
paramJson.put("path", "pages/index/index"); //这是设置扫描二维码后跳转的页面
paramJson.put("width", 430);
paramJson.put("is_hyaline", true);
paramJson.put("auto_color", true);
System.out.println("httpURLConnection"+httpURLConnection);
System.out.println("paramJson.toString()"+paramJson.toString());
printWriter.write(paramJson.toString());
// flush输出流的缓冲
printWriter.flush();
//开始获取数据
BufferedInputStream bis = new BufferedInputStream(httpURLConnection.getInputStream());
OutputStream os = new FileOutputStream(new File(codeUrl));
int len;
byte[] arr = new byte[1024];
while ((len = bis.read(arr)) != -1)
{
os.write(arr, 0, len);
os.flush();
}
os.close();
}
catch (Exception e)
{
e.printStackTrace();
}
return twoCodeUrl;
}
}
3、创建一个Controller作接口调用
package com.example.controller;
import com.example.utils.CreateQrcore;
import net.sf.json.JSONObject;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;
@RestController
public class CoreController {
/**
* 接收二维码
* @param request
* @return
* @throws IOException
*/
@RequestMapping(value="/twoCode",method= RequestMethod.POST,produces="text/html;charset=utf-8")
@ResponseBody
public Object twoCode( HttpServletRequest request) throws IOException{
JSONObject data=new JSONObject();
String accessToken = CreateQrcore.getToken();
System.out.println("accessToken;"+accessToken);
String twoCodeUrl = CreateQrcore.getminiqrQr(accessToken,request);
data.put("twoCodeUrl", twoCodeUrl);
return data;
}
}
二、小程序端
1、在二维码设置的跳转页面里的JS中写入以下代码进行获取二维码的参数
在onLoad()方法中加上options参数，然后用decodeURIComponent转一次码后进行或许，这些操作都是必须的，而且scene这个变量名是不可变的
onLoad(options) {
var scene_id = decodeURIComponent(options.scene); //获取二维码的参数
console.info('scene_id : ' +scene_id)
if(scene_id == 'undefined' || !scene_id || scene_id == null ){
wx.reLaunch({
url: '/pages/index/share',
})
return false;
}
this.scene = scene_id; //获取的机器码编号
console.info(this.scene)
//检查登录是否过期
wx.checkSession({
success: function(e) { //登录态未过期
console.log(new Date() + "未过期");
},
fail: function() { //登录态过期了
console.log(new Date() + "已过期");
}
});
},
2、拿刚刚生成的二维码在小程序端进行测试，在微信开发者工具里有个通过二维码编译，点击后选择刚刚生成的二维码
image.png
3、获取参数成功~~
image.png
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