Question

这是来自jsonObject

的字符串

{"no":1000,"name":"xxx","code":345}

我想将此字符串转换为JSONObject。代码在这里

try {
    URL url = new URL("http://localhost:8090/search?numer="+no);
    HttpURLConnection conn = (HttpURLConnection) url.openConnection();
    conn.setRequestMethod("GET");
    conn.setRequestProperty("Accept", "application/json");
    if (conn.getResponseCode() != 200) {
        throw new RuntimeException("Failed : HTTP error code : "+ conn.getResponseCode());
    }

    BufferedReader br = new BufferedReader(new InputStreamReader((conn.getInputStream())));
    String output ;
    System.out.println("Output from Server .... \n");
    while ((output = br.readLine()) != null) {
        System.out.println(output);//output:{"no":1000,"name":"xxx","code":345}
    }
    conn.disconnect();

} catch (MalformedURLException e) {
    e.printStackTrace();
} catch (IOException e) {
    e.printStackTrace();
}

Answer 1

第1步：添加这两行

JSONParser parser = new JSONParser();
JSONObject json = (JSONObject) parser.parse(output);

步骤2：将以下依赖项添加到pom.xml

<!-- https://mvnrepository.com/artifact/com.googlecode.json-simple/json-simple -->
<dependency>
    <groupId>com.googlecode.json-simple</groupId>
    <artifactId>json-simple</artifactId>
    <version>1.1</version>
</dependency>

Answer 2

我用过杰克逊。示例：https://www.mkyong.com/java/jackson-2-convert-java-object-to-from-json/

创建POJO。我不知道类型是什么，但由于它的名称为字段name，我将其称为User。

public class User {
    private int no;
    private String name;
    private int code;

    //getters setters
}

然后是这样的：

 User user = mapper.readValue(output, User.class);

如何在Java中将String转换为jsonObject？

2 个答案: