protected List<Long> findAdminAgentIdsByAppId(Long appId){ List<Agent> agentList = agentByRoleCacher.findByType(appId, EnumAgentType.ADMIN); if (CollectionUtils.isEmpty(agentList)) { return new ArrayList<>(); } return agentList.stream().map(Agent::getId).collect(Collectors.toList()); } 这是我的代码,第6行 agentList有时会出现 空指针
时间: 2024-04-12 16:30:42 浏览: 21
根据你提供的代码,空指针异常可能出现在第6行的 `agentList` 对象上。如果 `agentList` 是空的,那么调用 `stream()` 方法会导致空指针异常。
为了避免这个问题,你可以在调用 `stream()` 方法之前先检查 `agentList` 是否为空。可以使用 `if` 语句来判断并返回一个空的列表,避免空指针异常的发生。修改后的代码如下所示:
```java
protected List<Long> findAdminAgentIdsByAppId(Long appId){
List<Agent> agentList = agentByRoleCacher.findByType(appId, EnumAgentType.ADMIN);
if (CollectionUtils.isEmpty(agentList)) {
return new ArrayList<>();
} else {
return agentList.stream().map(Agent::getId).collect(Collectors.toList());
}
}
```
通过添加 `else` 语句,当 `agentList` 不为空时,才执行 `stream()` 方法和后续的操作。
这样修改后,如果 `agentList` 为空,将返回一个空的列表而不会抛出空指针异常。如果还有其他问题,请提供更多信息,我将尽力帮助你解决。
相关问题
Map<String, List<PodAppInfo>> collect = processList.stream() .collect(Collectors.groupingBy(PodAppInfo::getAppId));
这段代码使用了Java 8中的Stream API,对一个PodAppInfo的List进行分组,按照每个PodAppInfo的appId属性进行分组,返回一个Map对象,其中key为appId,value为该appId对应的PodAppInfo对象List。具体解释如下:
- processList.stream():将PodAppInfo的List转换成Stream对象,以便进行后续的操作。
- .collect(Collectors.groupingBy(PodAppInfo::getAppId)):使用groupingBy静态方法对Stream对象进行分组,按照PodAppInfo对象的appId属性进行分组,并返回一个Map对象,其中key为appId,value为该appId对应的PodAppInfo对象List。
最终,collect对象存储了按照appId分组后的PodAppInfo对象List,可以通过collect.get(appId)获取该appId对应的PodAppInfo对象List。
根据接口“”@FeignClient(name = "UserUgsApi", url = "${newbim.login-domain}") public interface IApplicationServicePlatformClient {@PostMapping("/ums/v1/feign/omp/project/search") ResultWrapper<QueryAllProject> listUserProject(@RequestHeader("BSP_TOKEN") String bspToken, @RequestHeader("BSP_USER_ID") String bspUserId, @RequestHeader("BSP_USER_ENV_ID") String bspUserEnvId, @RequestHeader("BSP_USER_TENANT") String bspUserTenant, @RequestBody ProjectCondition queryProjectDto);和代码“@Component @Slf4j public class ApplicationServicePlatformClientProxy { @Autowired private IApplicationServicePlatformClient applicationServicePlatformClient; public QueryAllProject listUserProject(String appId, String companyId, String designStatusList, String pageSize, ProjectCondition userId) { ResultWrapper<QueryAllProject> result = null; return result.getData(); } }”,修改下面内容:public List<ProjectCountVO> projectCount(String beginTime, String endTime, Integer forceType, String projectId) { List<TaskTask> taskTaskList = this.listStatisticsTask(beginTime, endTime, forceType, projectId); if (CollectionUtil.isEmpty(taskTaskList)) { return Collections.emptyList(); } List<ProjectCountVO> result = new ArrayList<>(); Map<String, List<TaskTask>> projectTaskMap = taskTaskList.stream().collect(Collectors.groupingBy(TaskTask::getProjectId)); for (Map.Entry<String, List<TaskTask>> projectTaskEntry : projectTaskMap.entrySet()) { projectId = projectTaskEntry.getKey(); ProjectCountVO projectCountVO = new ProjectCountVO(); projectCountVO.setId(projectId); //查询项目名称 ResultWrapper<QueryAllProject> projectResult = applicationServicePlatformClient.listUserProject( "token", "userId", "userEnvId", "userTenant", new ProjectCondition()); QueryAllProject queryAllProject = projectResult.getData(); String projectName = queryAllProject.getBtpProjectId(); projectCountVO.setName(projectName); List<TaskTask> taskList = projectTaskEntry.getValue(); projectCountVO.setTaskCount(taskList.size()); Integer problemCount = CollectionUtil.isEmpty(taskList) ? 0 : taskList.stream().collect(Collectors.summingInt(task -> Optional.ofNullable(task.getProblemNum()).orElse(0))); projectCountVO.setProblemCount(problemCount); result.add(projectCountVO); } return result; }
在代码中,我们需要调用IApplicationServicePlatformClient接口中的listUserProject方法来获取项目名称。在调用该方法时,需要传入五个参数:bspToken、bspUserId、bspUserEnvId、bspUserTenant和queryProjectDto。这些参数的值需要根据实际情况来确定。其中,queryProjectDto是一个ProjectCondition类型的对象,需要根据实际情况来构造。
修改后的代码如下:
```
@Component
@Slf4j
public class ApplicationServicePlatformClientProxy {
@Autowired
private IApplicationServicePlatformClient applicationServicePlatformClient;
public List<ProjectCountVO> projectCount(String beginTime, String endTime, Integer forceType, String projectId) {
List<TaskTask> taskTaskList = this.listStatisticsTask(beginTime, endTime, forceType, projectId);
if (CollectionUtil.isEmpty(taskTaskList)) {
return Collections.emptyList();
}
List<ProjectCountVO> result = new ArrayList<>();
Map<String, List<TaskTask>> projectTaskMap = taskTaskList.stream()
.collect(Collectors.groupingBy(TaskTask::getProjectId));
for (Map.Entry<String, List<TaskTask>> projectTaskEntry : projectTaskMap.entrySet()) {
projectId = projectTaskEntry.getKey();
ProjectCountVO projectCountVO = new ProjectCountVO();
projectCountVO.setId(projectId);
// 查询项目名称
ResultWrapper<QueryAllProject> projectResult = applicationServicePlatformClient.listUserProject(
"token", "userId", "userEnvId", "userTenant",
new ProjectCondition()
);
QueryAllProject queryAllProject = projectResult.getData();
String projectName = queryAllProject.getBtpProjectId();
projectCountVO.setName(projectName);
List<TaskTask> taskList = projectTaskEntry.getValue();
projectCountVO.setTaskCount(taskList.size());
Integer problemCount = CollectionUtil.isEmpty(taskList) ? 0 : taskList.stream()
.collect(Collectors.summingInt(task -> Optional.ofNullable(task.getProblemNum()).orElse(0)));
projectCountVO.setProblemCount(problemCount);
result.add(projectCountVO);
}
return result;
}
}
```