java json转化为实体、实体转化为json字符串通用utils

最新推荐文章于 2024-11-04 09:14:38 发布

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本文介绍如何使用Jackson库在Java中将实体类转换为JSON字符串，以及如何从JSON字符串反序列化回实体对象。通过示例代码展示了具体的实现过程，并提供了必要的Maven依赖。

实体类转化为json字符串。

    public static <T> JSONObject objectToJson(Object obj) throws JSONException, IOException {
        ObjectMapper mapper = new ObjectMapper();
        String jsonStr = "";
        jsonStr = mapper.writeValueAsString(obj);
        return new JSONObject(jsonStr);
    }

json数据转化为实体。


    public static <T>  T objectToBean(String jsonStr, Class<T> obj) throws IOException {
        ObjectMapper mapper = new ObjectMapper();
        return mapper.readValue(jsonStr, obj);
    }

调用方式


    @Test
    public void testTojsonStr() {
        FileCutUploadRequest fileCutUploadRequest = new FileCutUploadRequest();
        fileCutUploadRequest.setUrl("sssssce");

        try {
            String jsonStr = objectToJson(fileCutUploadRequest).toString();
            System.out.println("实体转化为的json 数据是: " + jsonStr);
            FileCutUploadRequest fileCutUploadRequest1 = objectToBean(jsonStr, FileCutUploadRequest.class);
            System.out.println("json数据转化之后的实体" + fileCutUploadRequest1.getUrl());
        } catch (JSONException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

maven Jackson依赖连接：

<!--jackson依赖-->
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-core</artifactId>
            <version>2.9.5</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.9.5</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-annotations</artifactId>
            <version>2.9.5</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.module</groupId>
            <artifactId>jackson-module-jaxb-annotations</artifactId>
            <version>2.9.5</version>
        </dependency>