如果用Spring那套RestTemplate不能获取,或者获取了生成的图片文件是无法打开的,大小是150多k的(当宽度为430的时候,应该是55k左右),可以看看我的方法
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"); } } }