java - 快速解析Java中与数组混合的深层json对象

Question

我想知道像这样将一些 JSON 快速解释为 Java 数组是否很快，或者使用 Jackson 等东西是否更好？

假设我正在解析这样的 JSON 对象:

{ "item1": "item",
  "roles": [ 
        { "roleName": "NormalUser" }
           ],
  "type": "worker"
}

然后我这里有一些 Java 代码(响应变量 = 来自 RestTemplate 的 ResponseEntity):

    logger.info("parsing role...");
    HashMap<String, Object> jsonBody = response.getBody();

    if(jsonBody.containsKey("roles")){          
        @SuppressWarnings("unchecked")
        List<HashMap<String, Object>> roles = (List<HashMap<String, Object>>)jsonBody.get("roles");

        logger.info("Cast Hashmap, now interpreting...");
        for (HashMap<String, Object> role : roles) {
            logger.info("Found role: " + role.toString());
            String assignedRole = "";
            if(role.containsKey("role")){
                assignedRole = (String) role.get("roleName");
            };
            this.roleAssignments.add(assignedRole);

            logger.info("Assigning role: {}", assignedRole);
        }
    }

Answer 1

您可以尝试JsonPath

例如

String content="some json";
List<String> assignedRoles = JsonPath.read(content, "$.roles[*].roleName");
this.roleAssignments.addAll(assignedRoles);