java版本下载

[Admol]

public static void main(String[] args) throws IOException { String jsonUrl = "https://raw.githubusercontent.com/spacelan/wechat-emoticon/master/emoticons.json"; URL url = new URL(jsonUrl); InputStream is = url.openConnection().getInputStream(); InputStreamReader isr = new InputStreamReader(is, "utf-8"); BufferedReader br = new BufferedReader(isr); String line = ""; String json = ""; while ((line = br.readLine()) != null) { json += line; } System.out.println(json); isr.close(); is.close(); JSONArray ja = JSONArray.parseArray(json);

    FileOutputStream fileOutputStream = null;
    DataInputStream dis = null;
    System.out.println("预计下载图片数count=" + ja.size());
    for (int i = 0; i < ja.size(); i++) {


        JSONObject jo = (JSONObject) ja.get(i);
        URL imgUrl = new URL((String) jo.get("url"));
        byte[] buffer = new byte[1024];
        dis = new DataInputStream(imgUrl.openConnection().getInputStream());
        File file = new File("d://wechat//img_" + i + ".gif");
        fileOutputStream = new FileOutputStream(file);
        int len = 0;
        System.out.println("正在下载第"+i+"张图片............");
        while ((len = dis.read(buffer)) > 0) {
            fileOutputStream.write(buffer, 0, len);
        }
    }
    fileOutputStream.close();
    dis.close();
}

[spacelan]

你们简直是666🌚

[runME]

不建议在循环中使用字符串"+",虽然编译器优化后会把"+"操作转化成StringBuilder的append()操作,但是在循环中会生成多个Stringbuilder,影响性能

[wanger86]

在for里不try catch遇到图片不存在的会崩……