小编bul*_*ous的帖子

我正在https://spring.io/ Spring Boot 上进行一些练习.

做示例https://spring.io/guides/gs/uploading-files/,当我使用Java 8时它工作正常,但遗憾的是我在Web服务中包装的代码需要Java 7.我列出了所有的错误代码,有人可以帮助我将lambda转换为1.7兼容代码并替换新库(java.util.stream.Stream和java.util.stream.Collectors).

Application.java

@SpringBootApplication
@EnableConfigurationProperties(StorageProperties.class)
public class Application {

    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }

    @Bean
    CommandLineRunner init(StorageService storageService) {
        return (args) -> {
            storageService.deleteAll();
            storageService.init();
        };
    }
}

return(args) - >错误说"使用source -8或更高版本来启用lambda表达式"

FileUploadController.java

import java.util.stream.Collectors

//..

@GetMapping("/")
public String listUploadedFiles(Model model) throws IOException {

    model.addAttribute("files", storageService
            .loadAll()
            .map(path ->
                    MvcUriComponentsBuilder
                            .fromMethodName(FileUploadController.class, "serveFile", path.getFileName().toString())
                            .build().toString())
            .collect(Collectors.toList()));

    return "uploadForm";
}

包java.util.stream不存在

type loadAll()是错误的

错误说"使用source -8或更高版本来启用lambda表达式"

FileSystemStorageService.java

@Override
public Stream<Path> loadAll() …

假设我有一个User对象列表,其中包含两个属性... ID和Name

List<User> lst = List<User>();

我填写了一堆用户.好的,现在我想使用RemoveAll()和此函数修剪我的列表.

private Boolean IsExisting(int id) {
//blah blah
return true;
//blah blah
return false;
}

所以我用这句话:

gdvFoo.DataSource = lst.RemoveAll(t => IsExisting(t.ID));

我的理解是,每当IsExisting返回true时,该元素应该从lst中删除,但是会发生什么,奇怪的是,它返回一个整数？,而不是截断的列表,我收到以下错误消息:

数据源是无效类型.它必须是IListSource,IEnumerable或IDataSource.>

public struct Speakers 
{
    //...

    public bool BackCenter { get; set; }
    public bool BackLeft { get; set; }
    public bool BackRight { get; set; }
    public bool FrontCenter { get; set; }
    public bool FrontLeft { get; set; }
    public bool FrontLeftOfCenter { get; set; }
    public bool FrontRight { get; set; }
    public bool FrontRightOfCenter { get; set; }
    public bool SideLeft { get; set; }
    public bool SideRight { get; set; }
    public bool Subwoofer { get; …

我正在使用命名管道与进程通信.我已经能够使用以下代码.(原始代码在这里:via archive.org)

class ProgramPipeTest
    {

        public void ThreadSenderStartClient(object obj)
        {
            // Ensure that we only start the client after the server has created the pipe
            ManualResetEvent SyncClientServer = (ManualResetEvent)obj;

            using (NamedPipeClientStream pipeStream = new NamedPipeClientStream(".","ToSrvPipe",PipeDirection.Out,PipeOptions.None))
            {
                // The connect function will indefinately wait for the pipe to become available
                // If that is not acceptable specify a maximum waiting time (in ms)
                pipeStream.Connect();

                Console.WriteLine("[Client] Pipe connection established");
                using (StreamWriter sw = new StreamWriter(pipeStream))
                {
                    sw.AutoFlush = true;
                    string …