在Java中使用Jackson创建JSON对象[duplicate]

Question

我需要使用Jackson创建一个JSON字符串，如下所示。我知道这里已经回答了类似的问题：使用jackson创建一个json对象

但我期望的JSON字符串与上面示例中的有点不同。

{
    "obj1": {
        "name1": "val1",
        "name2": "val2"
    },
    "obj2": {
        "name3": "val3",
        "name4": "val4"
    },
    "obj3": {
        "name5": "val5",
        "name6": "val6"
    }
}

Answer 1

试试看：

ObjectMapper mapper = new ObjectMapper();
ObjectNode rootNode = mapper.createObjectNode();

ObjectNode childNode1 = mapper.createObjectNode();
childNode1.put("name1", "val1");
childNode1.put("name2", "val2");

rootNode.set("obj1", childNode1);

ObjectNode childNode2 = mapper.createObjectNode();
childNode2.put("name3", "val3");
childNode2.put("name4", "val4");

rootNode.set("obj2", childNode2);

ObjectNode childNode3 = mapper.createObjectNode();
childNode3.put("name5", "val5");
childNode3.put("name6", "val6");
    
rootNode.set("obj3", childNode3);


String jsonString = mapper.writerWithDefaultPrettyPrinter().writeValueAsString(rootNode);
System.out.println(jsonString);