Android下载json(包括服务器代码)

最新推荐文章于 2021-05-27 10:52:33 发布

原创最新推荐文章于 2021-05-27 10:52:33 发布 · 408 阅读

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#json

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本文介绍了一个具体的案例，展示了如何通过HTTP请求实现JSON数据的服务器端发送及Android客户端接收过程，包括服务器端设置响应类型、读取文件并发送，以及Android客户端如何发起请求下载文件、解析JSON数据。

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json数据为：

[
{
 "date":"2017-09-16",
 "locationZ":"we",
 "locationQ":"qw",
 "id":null,
 "time":"12:31",
 "userName":"Yu"
},
{
 "date":"2017-11-23",
 "locationZ":"xf",
 "locationQ":"ty",
 "id":null,
 "time":"12:31",
 "userName":"Yu"
},
{
 "date":"2017-05-21",
 "locationZ":"xf",
 "locationQ":"hd",
 "id":null,
 "time":"12:31",
 "userName":"Yu"
}
]

服务器

HttpServletResponse response = ServletActionContext.getResponse();
			response.setContentType("text/html;charset=utf-8");
			PrintWriter writer;
			FileInputStream fs;
			File file = new File("E://project//12.json");
	        BufferedReader br;
	        String path = "E://project//12.json";
			fs = new FileInputStream(file);
			byte[] image = new byte[1024];
			fs.read(image,0,1024);
			fs.close();
			response.setHeader("Content-Type", "application/octet-stream");
			response.setHeader("Content-Disposition","attachment;filename=12.json");
			response.setContentType("text/html;charset=utf-8");
			response.getOutputStream().write(image);
			response.getOutputStream().flush();
			response.getOutputStream().close();

Android

下载文件-读取文件-输出文件

public void doDownload() {
        Request.Builder builder = new Request.Builder();
        final Request request = builder
                .get()
                .url(OkhttpUse.url + "CarBD1")
                .build();
        Call call = OkhttpUse.client.newCall(request);
        call.enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
                Log.e("onFailure: ", e.getMessage());
                e.printStackTrace();
            }
            @Override
            public void onResponse(Call call, Response response) throws IOException {
                Log.e("onResponse: ", "ennnnnn");
                InputStream is = response.body().byteStream();
                int len = 0;
                File file = new File(Environment.getExternalStorageDirectory(), "/12.json");
                byte[] buf = new byte[128];
                FileOutputStream fos = new FileOutputStream(file);
                while ((len = is.read(buf)) != -1) {
                    fos.write(buf, 0, len);
                }
                fos.flush();
                fos.close();
                is.close();
                ReadFile();
            }
        });
    }

    public void ReadFile() {
        File file = new File(Environment.getExternalStorageDirectory(), "12.json");
        BufferedReader br;
        String path = Environment.getExternalStorageDirectory() + "/12.json";
        try {
            FileInputStream fileInputStream = new FileInputStream(Environment.getExternalStorageDirectory() + "/12.json");
            InputStreamReader inputStreamReader = new InputStreamReader(fileInputStream, "utf-8");
//            FileReader fileReader = new FileReader(file);
            br = new BufferedReader(inputStreamReader);
            String line;
            StringBuilder builder = new StringBuilder();
            while ((line = br.readLine()) != null) {
                builder.append(line);
            }
            Log.e("String :      ", builder.toString());
            br.close();
//            inputStreamReader.close();
            json = builder.toString();
            Json(json);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }
    public void Json(String json) {
        try {
            JSONArray jsonArray = new JSONArray(json);
            if(json!=null &&json.startsWith("\ufeff")){
                json = json.substring(1);
            }
            for (int i=0;i<jsonArray.length();i++){
                JSONObject jsonObject = jsonArray.getJSONObject(i);
                date = jsonObject.getString("date");
                locationZ = jsonObject.getString("locationZ");
                locationQ = jsonObject.getString("locationQ");
                id = jsonObject.getString("id");
                time = jsonObject.getString("time");
                username = jsonObject.getString("userName");
                carPerson = new CarPerson();
                carPerson.setDate(date);
                carPerson.setTime(time);
                carPerson.setLocationQ(locationQ);
                carPerson.setLocationZ(locationZ);
                carPerson.setUserName(username);
                carPersons.add(carPerson);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }