这对我来说很管用:

import groovy.json.JsonBuilder
properties = new Properties()
properties.put("name", "zhangsan")

println new JsonBuilder(properties).toPrettyString()

您可以使用Jackson将Map转换为JSON，如下所示:

Map<String,Object> map = new HashMap<>();
//You can convert any Object.
String[] value1 = new String[] { "value11", "value12", "value13" };
String[] value2 = new String[] { "value21", "value22", "value23" };
map.put("key1", value1);
map.put("key2", value2);
map.put("key3","string1");
map.put("key4","string2");

String json = new ObjectMapper().writeValueAsString(map);
System.out.println(json);

Jackson的Maven依赖:

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-core</artifactId>
    <version>2.5.3</version>
    <scope>compile</scope>
</dependency>

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.5.3</version>
    <scope>compile</scope>
</dependency>

If you are using `JSONObject` library, you can convert map to `JSON` as follows: JSONObject Library: import org.json.JSONObject; Map<String, Object> map = new HashMap<>(); // Convert a map having list of values. String[] value1 = new String[] { "value11", "value12", "value13" }; String[] value2 = new String[] { "value21", "value22", "value23" }; map.put("key1", value1); map.put("key2", value2); JSONObject json = new JSONObject(map); System.out.println(json); Maven Dependencies for `JSONObject` : <dependency> <groupId>org.json</groupId> <artifactId>json</artifactId> <version>20140107</version> </dependency> Hope this will help. Happy coding.

以下是我与GSON的单线解决方案:

myObject = new Gson().fromJson(new Gson().toJson(myHashMap), MyClass.class);

这对我来说很管用:

import groovy.json.JsonBuilder
properties = new Properties()
properties.put("name", "zhangsan")

println new JsonBuilder(properties).toPrettyString()

我使用阿里巴巴fastjson，简单明了:

<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
    <version>VERSION_CODE</version>
</dependency>

和导入:

import com.alibaba.fastjson.JSON;

然后:

String text = JSON.toJSONString(obj); // serialize
VO vo = JSON.parseObject("{...}", VO.class); //unserialize

一切都好。

如果使用复杂对象，应该应用enableComplexMapKeySerialization()，如https://stackoverflow.com/a/24635655/2914140和https://stackoverflow.com/a/26374888/2914140中所述。

Gson gson = new GsonBuilder().enableComplexMapKeySerialization().create();
Map<Point, String> original = new LinkedHashMap<Point, String>();
original.put(new Point(5, 6), "a");
original.put(new Point(8, 8), "b");
System.out.println(gson.toJson(original));

输出将是:

{
 "(5,6)": "a",
 "(8,8)": "b"
}