Java生成微信小程序码
官网文档地址:获取小程序码
package test;
import com.alibaba.fastjson.JSONObject;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.apache.http.HttpEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.util.EntityUtils;
import java.io.*;
import java.net.URLEncoder;
import java.util.*;
import java.util.stream.Collectors;
/**
* @description:
* @author: Mr.Fang
* @create: 2023-04-03 17:06
**/
public class WxUtils {
/**
* description: 获取token,返回结果为 JSON 自行转 map
* create by: Mr.Fang
*
* @return: java.lang.String
* @date: 2023/4/3 17:46
*/
public String getToken() throws IOException {
CloseableHttpClient httpClient = HttpClientBuilder.create().build();
Map<String, Object> params = new HashMap<>();
params.put("appid", "appid");
params.put("secret", "secret");
params.put("grant_type", "client_credential");
String url = handleParams("https://api.weixin.qq.com/cgi-bin/token", params);
HttpGet httpGet = new HttpGet(url);
CloseableHttpResponse response = httpClient.execute(httpGet);
HttpEntity entity = response.getEntity(); // 响应结果
return EntityUtils.toString(entity, CharSetType.UTF8.getType());
}
/**
* description: 对象转 字符串
* create by: Mr.Fang
*
* @param obj
* @return: java.lang.String
* @date: 2023/4/3 17:45
*/
public String objToStr(Object obj) {
ObjectMapper objectMapper = new ObjectMapper();
if (Objects.nonNull(obj)) {
try {
return objectMapper.writeValueAsString(obj);
} catch (JsonProcessingException e) {
e.printStackTrace();
}
}
return null;
}
/**
* description: 字符串 转 对象转
* create by: Mr.Fang
*
* @param jsonStr
* @param objClass
* @return: java.lang.String
* @date: 2023/4/3 17:45
*/
public <T> T strToObj(String jsonStr, Class<T> objClass) {
ObjectMapper objectMapper = new ObjectMapper();
try {
T t = objectMapper.readValue(jsonStr, objClass);
return t;
} catch (IOException e) {
e.printStackTrace();
return null;
}
}
/**
* description: 生成小程序码
* create by: Mr.Fang
*
* @param scene 携带参数
* @param page 页面路径
* @param token token
* @param path 保存路径
* @return: java.lang.String
* @date: 2023/5/11 14:22
*/
public String appletQR(String scene, String page, String token, String path) throws IOException {
CloseableHttpClient httpClient = HttpClientBuilder.create().build();
Map<String, Object> params = new HashMap<>();
params.put("scene", scene);
params.put("page", page); //developer为开发版;trial为体验版;formal为正式版;默认为正式版
params.put("env_version", "develop"); //要打开的小程序版本。正式版为 "release",体验版为 "trial",开发版为 "develop"。默认是正式版。
HttpPost httpPost = new HttpPost("https://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token=" + token);
httpPost.addHeader("ContentTyp", "application/json");
// 参数转 JSON 格式
String json = objToStr(params);
StringEntity stringEntity = new StringEntity(json, CharSetType.UTF8.getType());
stringEntity.setContentEncoding(CharSetType.UTF8.getType());
httpPost.setEntity(stringEntity);
CloseableHttpResponse response = httpClient.execute(httpPost);
HttpEntity entity = response.getEntity(); // 响应结果
byte[] data;
try {
data = readInputStream(entity.getContent());
} catch (Exception e) {
e.printStackTrace();
return null;
}
if (data.length < 100) { // 异常
String error = new String(data);
return null;
}
String fileName = UUID.randomUUID().toString().replaceAll("-", "") + ".png";
String filePath = path + File.separator + fileName;
// 创建文件
FileOutputStream fileOutputStream = null;
try {
fileOutputStream = new FileOutputStream(filePath);
fileOutputStream.write(data);
fileOutputStream.flush();
} catch (IOException e) {
e.printStackTrace();
}
// 释放资源
try {
assert fileOutputStream != null;
fileOutputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
return fileName;
}
/**
* description: 输入流转字节数组
* create by: Mr.Fang
*
* @param inStream 输入流
* @return: byte[]
* @date: 2023/5/11 11:52
*/
public static byte[] readInputStream(InputStream inStream) throws Exception {
ByteArrayOutputStream outStream = new ByteArrayOutputStream();
// 创建一个Buffer字符串
byte[] buffer = new byte[1024];
// 每次读取的字符串长度,如果为-1,代表全部读取完毕
int len = 0;
// 使用一个输入流从buffer里把数据读取出来
while ((len = inStream.read(buffer)) != -1) {
// 用输出流往buffer里写入数据,中间参数代表从哪个位置开始读,len代表读取的长度
outStream.write(buffer, 0, len);
}
// 关闭输入流
inStream.close();
// 把outStream里的数据写入内存
return outStream.toByteArray();
}
public static void main(String[] args) throws IOException {
WxUtils wxUtils = new WxUtils();
// 获取 token
String token = wxUtils.getToken();
// 字符串转 map 对象
Map map = wxUtils.strToObj(token, Map.class);
// 生成小程序码
String path = wxUtils.appletQR("2023", "pages/index/index", map.get("access_token").toString(), System.getProperty("user.dir") + File.separator);
System.out.println(path);
}
}
项目根目录生成小程序码
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