如何从响应中提取 json 数据 - Java [英] How to extract json data from the response - Java

问题描述

我正在尝试从仅使用 Java 代码的响应中获取的 Json 字符串中提取数据.我在这里发布我的 Java 代码.

I am trying to extract data from Json string which is obtained by a response using only Java code. I am posting my Java code here.

输出:

Entering into while loop
[{"name":"Frank","food":"pizza","quantity":3}]

这是我的 Java 代码.

This is my Java code.

public void receive() 
{    
System.out.println("Entering into sendNote method");   
try {
// make json string,
String json = "{\"name\":\"Frank\",\"food\":\"pizza\",\"quantity\":3}";
// send as http get request
URL url1 = new URL("http://myurl/file.php?usersJSON="+userList);
URLConnection conn1= url1.openConnection();
//I am receiving exactly what I have sent....
BufferedReader rd = new BufferedReader(new InputStreamReader(conn1.getInputStream()));
String line;
while ((line = rd.readLine()) != null) 
{
System.out.println("Entering into while loop");
System.out.println(line);// line contains the received json parameters
//I want to enter the recieved parameters into my database
//
//
//
//I need the solution right here....
}
rd.close();
} 
catch (Exception e) 
{
System.out.println("Error Occured while receiving");
e.printStackTrace();
}
}

谢谢！！！！！！

@安库尔:我就是这样试的，

@Ankur: This is how I tried,

@Lahiru Prasanna，@ankur-singhal非常感谢.！！

@ Lahiru Prasanna, @ankur-singhal Thanks a lot.!!

推荐答案

我认为你成功获得了 HttpResponse.这里的变量叫做 response 是 HttpResponse.

I think that you successfully got HttpResponse.here variable called response is HttpResponse.

        // Could do something better with response.
        StatusLine statusLine = response.getStatusLine();

        if (statusLine.getStatusCode() == 200) {
            HttpEntity entity = response.getEntity();
            InputStream content = entity.getContent();
        StringBuilder   builder = new StringBuilder();
            BufferedReader reader = new BufferedReader(
                new InputStreamReader(content));
            String line;
            try {
                while ((line = reader.readLine()) != null) {
                    builder.append(line);
                }
                content.close();

            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            try {
            JSONObject  jsonObject = new JSONObject(builder.toString());
            } catch (JSONException e) {
                System.out.println("Error parsing data " + e.toString());
            }

        }
    } catch (Exception e) {
        System.out.println("Error:  " + e.toString());
        System.out.println( "" + e.toString());
        System.out.println("" + e.toString());
    } 

重要的是永远不要将字符串用于 json 操作.

And important thing is never use Strings for json operations.

您可以像这样从 jsonObject 检索数据

you can retrieve your data from jsonObject like this

String name = jsonObject.getString("name");

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