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分享微信小程序 获取二维码（小程序码）并将图片保存到本地遇到的生成文件无法打开的问题
用的是微信的B接口https://api.weixin.qq.com/wxa/getwxacodeunlimit
返回的东西直接输出到控制台是乱码，就像用记事本打开一张图片一样，用普通FileOutputStream out... out.write(byt)那套生成的图片无法打开，请问应该如何才能将图片保存到本地
在PostMan中用代码中的参数是可以正确生成并显示小程序码的
附上微信的开发文档链接：https://mp.weixin.qq.com/debug/wxadoc/dev/api/qrcode.html
返回的东西直接输出到控制台是乱码，就像用记事本打开一张图片一样，用普通FileOutputStream out... out.write(byt)那套生成的图片无法打开，请问应该如何才能将图片保存到本地
在PostMan中用代码中的参数是可以正确生成并显示小程序码的
附上微信的开发文档链接：https://mp.weixin.qq.com/debug/wxadoc/dev/api/qrcode.html
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奔跑的泉水yym 2020-06-22
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感谢楼主和正解
VitoYi 2020-06-10
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感谢楼主，9楼正解
weixin_41957098 2020-06-10
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加入了 创建 文件夹，和 图片命名 ，放到自己的项目里，调用 getQrcode 传参就可以了
package mygirl.com.utils;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.util.HashMap;
import java.util.Map;
import org.apache.http.HttpResponse;
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.protocol.HTTP;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import java.util.HashMap;
import java.util.Map;
public class CreateQrcode {
/**
* 生成带参小程序二维码
* @param access_token
* @param params
* @param filePath
* @return
* @throws Exception
*/
public static String getQrcode(String access_token, Map params,String filePath) throws Exception {
long time=System.currentTimeMillis();
File dirFile = new File(filePath+ymdString());
if (!dirFile.exists()) {
dirFile.mkdirs(); //如果目录不存在则创建此目录
}
String newFilePath = filePath+ymdString()+time+".JPG";
saveQrcode(access_token,params,newFilePath);
return newFilePath;
}
//获取当前日期 2019/10/12 建立三级目录
public static String ymdString() {
LocalDateTime ldt = LocalDateTime.now(ZoneId.of("Asia/Shanghai"));
String year = String.valueOf(ldt.getYear());
String month = String.valueOf(ldt.getMonthValue());
String day = String.valueOf(ldt.getDayOfMonth());
return year + "\\" + month + "\\" + day+"\\";
}
/**
* 二进制生成二维码图片
* @param access_token
* @param params
* @throws Exception
*/
public static void saveQrcode(String access_token, Map params,String filePath) throws Exception{
CloseableHttpClient httpClient = HttpClientBuilder.create().build();
HttpPost httpPost = new HttpPost("https://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token="+access_token);
httpPost.addHeader(HTTP.CONTENT_TYPE, "application/json");
String body = JSON.toJSONString(params);
StringEntity entity;
entity = new StringEntity(body);
entity.setContentType("image/png");
httpPost.setEntity(entity);
HttpResponse response;
response = httpClient.execute(httpPost);
InputStream inputStream = response.getEntity().getContent();
// File targetFile = new File(filePath);
// if(!targetFile.exists()){
// targetFile.mkdirs();
// }
FileOutputStream out = new FileOutputStream(filePath);
byte[] buffer = new byte[8192];
int bytesRead = 0;
while((bytesRead = inputStream.read(buffer, 0, 8192)) != -1) {
out.write(buffer, 0, bytesRead);
}
out.flush();
out.close();
}
}
weixin_41957098 2020-06-10
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weixin_41957098 2020-06-10
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我用了，可以了打正常生成，小程序没有发布，page 里不要写东西，填空，线上的发布了就可以了填了，
zmnkdyw 2020-04-27
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生成的图片无法打开，‘暂不支持打开此图片’，是因为小程序没有发布吗？
lydiajia 2019-11-22
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昨天搞了一晚上，看上面的这个方法终于搞定了。十分感谢~~
Emws 2019-07-30
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确实解决了，谢谢
惊云丶 2019-07-10
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楼主为什么我用你这个方法有时候生成不了
Aaryn30 2018-04-09
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楼主为什么我是用你的解决方案还是有问题呢，可以帮忙看一下问题出在哪里吗，是不是因为小程序上线的问题
_Slience_ 2018-03-11
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已解决，最后用以下方法进行处理可以达到效果
package com.wx.scooter;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;
import org.apache.http.HttpResponse;
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.protocol.HTTP;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.wx.scooter.tool.CheckTool;
import com.wx.scooter.tool.Constant;
import com.wx.scooter.tool.HttpTool;
public class TestQR {
public static void main(String[] args) throws Exception {
//获取token
String result1 = HttpTool.get("https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid="+Constant.NATIVE_APP_ID+"&secret="+Constant.NATIVE_APP_SECRET);
String access_token = JSONObject.parseObject(result1).getString("access_token");
if(CheckTool.isString(access_token)) {
System.out.println("token为");
System.out.println(access_token);
Map<String, Object> params = new HashMap<>();
params.put("scene", "test");
params.put("page", "pages/index/index");
params.put("width", 430);
CloseableHttpClient httpClient = HttpClientBuilder.create().build();
HttpPost httpPost = new HttpPost("https://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token="+access_token);
httpPost.addHeader(HTTP.CONTENT_TYPE, "application/json");
String body = JSON.toJSONString(params);
StringEntity entity;
entity = new StringEntity(body);
entity.setContentType("image/png");
httpPost.setEntity(entity);
HttpResponse response;
response = httpClient.execute(httpPost);
InputStream inputStream = response.getEntity().getContent();
File targetFile = new File("D:\\");
if(!targetFile.exists()){
targetFile.mkdirs();
}
FileOutputStream out = new FileOutputStream("D:\\upload\\5.png");
byte[] buffer = new byte[8192];
int bytesRead = 0;
while((bytesRead = inputStream.read(buffer, 0, 8192)) != -1) {
out.write(buffer, 0, bytesRead);
}
out.flush();
out.close();
} else {
System.out.println("获取access_token错误");
}
}
}
Sunyiban 2018-03-09
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参数放进去了，输出出来的是一堆乱码，就像用记事本打开图片似的。
不过生成的文件还是和以前一样打不开，求助，感惜[/quote]
什么样的乱码，发来看看
_Slience_ 2018-03-09
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参数放进去了，输出出来的是一堆乱码，就像用记事本打开图片似的。
不过生成的文件还是和以前一样打不开，求助，感惜
_Slience_ 2018-03-09
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拼在URL会微信那边报这个错误——{"errcode":44002,"errmsg":"empty post data hint: [3ONdKA06804525]"}
_Slience_ 2018-03-09
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我是这样获取转换的
//获取token
String result1 = HttpTool.get("https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid="+Constant.NATIVE_APP_ID+"&secret="+Constant.NATIVE_APP_SECRET);
String access_token = JSONObject.parseObject(result1).getString("access_token");
if(CheckTool.isString(access_token)) {
System.out.println(access_token);
Map<String, Object> params = new HashMap<>();
params.put("scene", "test");
params.put("page", "pages/index/index");
params.put("width", 430);
StringHttpMessageConverter m = new StringHttpMessageConverter(Charset.forName("UTF-8"));
RestTemplate restTemplate=new RestTemplateBuilder().additionalMessageConverters(m).build();
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.IMAGE_JPEG);
HttpEntity<String> entity = new HttpEntity<String>(JSON.toJSONString(params), headers);
ResponseEntity<String> result = restTemplate.exchange("https://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token="+access_token, HttpMethod.POST, entity, String.class);
try {
// System.out.println(result);
//将返回的数据保存到本地
File targetFile = new File("D:\\");
if(!targetFile.exists()){
targetFile.mkdirs();
}
FileOutputStream out = new FileOutputStream("D:\\upload\\1.png");
out.write(result.getBody().getBytes());
out.flush();
out.close();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
} else {
System.out.println("获取access_token错误");
}
URL url = null;
HttpURLConnection connection = null;
try {
url = new URL( "");
System.out.println(url);
connection = (HttpURLConnection) url.openConnection();// 新建连接实例
connection.setConnectTimeout(2000);// 设置连接超时时间，单位毫秒
connection.setReadTimeout(2000);// 设置读取数据超时时间，单位毫秒
connection.setDoInput(true);// 是否打开输出 true|false
connection.setRequestMethod("POST");// 提交方法POST|GET
connection.setUseCaches(false);// 是否缓存true|false
connection.connect();// 打开连接端口
BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream(), "UTF-8"));
StringBuffer buffer = new StringBuffer();
String line = "";
while ((line = reader.readLine()) != null) {
buffer.append(line);
}
reader.close();
System.out.println(buffer.toString());
} catch (Exception e) {
e.printStackTrace();
} finally {
if (connection != null) {
connection.disconnect();// 关闭连接
}
}Sunyiban 2018-03-09
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把你拼的URL放进去就行了~
Sunyiban 2018-03-09
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我是这样获取转换的
//获取token
String result1 = HttpTool.get("https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid="+Constant.NATIVE_APP_ID+"&secret="+Constant.NATIVE_APP_SECRET);
String access_token = JSONObject.parseObject(result1).getString("access_token");
if(CheckTool.isString(access_token)) {
System.out.println(access_token);
Map<String, Object> params = new HashMap<>();
params.put("scene", "test");
params.put("page", "pages/index/index");
params.put("width", 430);
StringHttpMessageConverter m = new StringHttpMessageConverter(Charset.forName("UTF-8"));
RestTemplate restTemplate=new RestTemplateBuilder().additionalMessageConverters(m).build();
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.IMAGE_JPEG);
HttpEntity<String> entity = new HttpEntity<String>(JSON.toJSONString(params), headers);
ResponseEntity<String> result = restTemplate.exchange("https://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token="+access_token, HttpMethod.POST, entity, String.class);
try {
// System.out.println(result);
//将返回的数据保存到本地
File targetFile = new File("D:\\");
if(!targetFile.exists()){
targetFile.mkdirs();
}
FileOutputStream out = new FileOutputStream("D:\\upload\\1.png");
out.write(result.getBody().getBytes());
out.flush();
out.close();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
} else {
System.out.println("获取access_token错误");
}
URL url = null;
HttpURLConnection connection = null;
try {
url = new URL( "");
System.out.println(url);
connection = (HttpURLConnection) url.openConnection();// 新建连接实例
connection.setConnectTimeout(2000);// 设置连接超时时间，单位毫秒
connection.setReadTimeout(2000);// 设置读取数据超时时间，单位毫秒
connection.setDoInput(true);// 是否打开输出 true|false
connection.setRequestMethod("POST");// 提交方法POST|GET
connection.setUseCaches(false);// 是否缓存true|false
connection.connect();// 打开连接端口
BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream(), "UTF-8"));
StringBuffer buffer = new StringBuffer();
String line = "";
while ((line = reader.readLine()) != null) {
buffer.append(line);
}
reader.close();
System.out.println(buffer.toString());
} catch (Exception e) {
e.printStackTrace();
} finally {
if (connection != null) {
connection.disconnect();// 关闭连接
}
}_Slience_ 2018-03-09
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我是这样获取转换的
//获取token
String result1 = HttpTool.get("https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid="+Constant.NATIVE_APP_ID+"&secret="+Constant.NATIVE_APP_SECRET);
String access_token = JSONObject.parseObject(result1).getString("access_token");
if(CheckTool.isString(access_token)) {
System.out.println(access_token);
Map<String, Object> params = new HashMap<>();
params.put("scene", "test");
params.put("page", "pages/index/index");
params.put("width", 430);
StringHttpMessageConverter m = new StringHttpMessageConverter(Charset.forName("UTF-8"));
RestTemplate restTemplate=new RestTemplateBuilder().additionalMessageConverters(m).build();
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.IMAGE_JPEG);
HttpEntity<String> entity = new HttpEntity<String>(JSON.toJSONString(params), headers);
ResponseEntity<String> result = restTemplate.exchange("https://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token="+access_token, HttpMethod.POST, entity, String.class);
try {
// System.out.println(result);
//将返回的数据保存到本地
File targetFile = new File("D:\\");
if(!targetFile.exists()){
targetFile.mkdirs();
}
FileOutputStream out = new FileOutputStream("D:\\upload\\1.png");
out.write(result.getBody().getBytes());
out.flush();
out.close();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
} else {
System.out.println("获取access_token错误");
}
Sunyiban 2018-03-07
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你怎么转换的，应该是流处理写的 有问题吧
