微信小程序二维码生成工具，后端二维码生成工具类。-白红宇的个人博客

微信小程序二维码生成工具，后端二维码生成工具类。

发布日期：2021-05-14 12:40:47 浏览次数：17 分类：精选文章

本文共 6848 字，大约阅读时间需要 22 分钟。

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package com.haishi.webappdemo.utils;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.URL;
import java.net.URLConnection;
public class HttpRequestUtils {
    public static String sendGet(String url, String param) throws IOException {
        BufferedReader in = null;
        try {
            String urlNameString = url + "?" + param;
            URL realUrl = new URL(urlNameString);
            URLConnection connection = realUrl.openConnection();
            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
     
      > map = connection.getHeaderFields();
            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("������GET���������������������" + e);
            e.printStackTrace();
        } finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (Exception e2) {
                e2.printStackTrace();
            }
        }
        return result;
    }
    public static String sendPost(String url, Map
      
        param, HttpServletResponse response) throws IOException {
        PrintWriter out = null;
        InputStream in = null;
        try {
            URL realUrl = new URL(url);
            URLConnection conn = realUrl.openConnection();
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            conn.setDoOutput(true);
            conn.setDoInput(true);
            out = new PrintWriter(conn.getOutputStream());
            out.print(param);
            out.flush();
            in = conn.getInputStream();
            OutputStream outputStream = response.getOutputStream();
            byte[] bytes = new byte[1024];
            while ((len = in.read(bytes)) != -1) {
                outputStream.write(bytes, 0, len);
            }
            outputStream.flush();
            outputStream.close();
        } catch (Exception e) {
            System.out.println("������ POST ���������������������" + e);
            e.printStackTrace();
        } finally {
            try {
                if (out != null) {
                    out.close();
                }
                if (in != null) {
                    in.close();
                }
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        }
    }

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package com.webappdemo.controller;
import com.haishi.webappdemo.utils.HttpRequestUtils;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import javax.servlet.http.HttpServletResponse;
import java.util.HashMap;
import java.util.Map;
@RestController
public class TestController {
    @RequestMapping(value = "/getQRcode.json", method = RequestMethod.GET)
    public void getQRcode(@RequestParam("url") String url, HttpServletResponse response) {
        Map
     
       param = new HashMap<>();
        HttpRequestUtils.sendPost(url, param, response);
    }
}

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