Java 将xml文件上载到Google云存储时出错

我想将文件上传到谷歌云存储，但我遇到了如下错误：

java.lang.NoSuchMethodError: com.google.common.base.Preconditions.checkNotNull

我想上传到谷歌云存储的xml文件格式：

<set xmlns="http://www.sitemaps.org/schemas/sitemap/0.9" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.sitemaps.org/schemas/sitemap/0.9 http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd">

获取错误如下所示：

Jan 29, 2019 6:49:31 AM com.google.api.server.spi.SystemService invokeServiceMethod
SEVERE: exception occurred while calling backend method
java.lang.NoSuchMethodError: com.google.common.base.Preconditions.checkNotNull(Ljava/lang/Object;Ljava/lang/String;Ljava/lang/Object;)Ljava/lang/Object;
    at com.google.appengine.tools.cloudstorage.GcsFileOptions$Builder.checkNotEmpty(GcsFileOptions.java:252)
    at com.google.appengine.tools.cloudstorage.GcsFileOptions$Builder.mimeType(GcsFileOptions.java:173)
    at com.vivoiz.healofy.backend.v2.helpers.utils.AppUtilities.uploadFileToGCS(AppUtilities.java:168)
    at com.vivoiz.healofy.backend.v2.apis.InternalApis.uploadFile(InternalApis.java:578)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at com.google.api.server.spi.SystemService.invokeServiceMethod(SystemService.java:351)
    at com.google.api.server.spi.handlers.EndpointsMethodHandler$RestHandler.handle(EndpointsMethodHandler.java:119)
    at com.google.api.server.spi.handlers.EndpointsMethodHandler$RestHandler.handle(EndpointsMethodHandler.java:102)
    at com.google.api.server.spi.dispatcher.PathDispatcher.dispatch(PathDispatcher.java:50)
    at com.google.api.server.spi.EndpointsServlet.service(EndpointsServlet.java:72)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
    at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:867)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1623)
    at com.googlecode.objectify.ObjectifyFilter.doFilter(ObjectifyFilter.java:48)
INFO     2019-01-29 06:49:31,105 module.py:861] v2: "GET /_ah/api/internalapis/v1/uploadFile HTTP/1.1" 503 454
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1610)
    at com.google.appengine.tools.development.devappserver2.RequestIdFilter.doFilter(RequestIdFilter.java:36)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1610)
    at com.google.appengine.tools.development.ResponseRewriterFilter.doFilter(ResponseRewriterFilter.java:134)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1610)
    at com.google.appengine.tools.development.HeaderVerificationFilter.doFilter(HeaderVerificationFilter.java:34)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1610)
    at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:48)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1610)
    at com.google.appengine.tools.development.jetty9.StaticFileFilter.doFilter(StaticFileFilter.java:123)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1602)
    at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:540)
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:146)
    at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:524)
    at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
    at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:257)
    at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1588)
    at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:255)
    at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1345)
    at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:203)
    at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:480)
    at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1557)
    at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:201)
    at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1247)
    at com.google.appengine.tools.development.jetty9.DevAppEngineWebAppContext.doScope(DevAppEngineWebAppContext.java:94)
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:144)
    at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
    at com.google.appengine.tools.development.jetty9.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:595)
    at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
    at org.eclipse.jetty.server.Server.handle(Server.java:502)
    at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:364)
    at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:260)
    at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:305)
    at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:103)
    at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:118)
    at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:333)
    at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:310)
    at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:168)
    at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.produce(EatWhatYouKill.java:132)
    at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:765)
    at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:683)
    at java.lang.Thread.run(Thread.java:748)

---

要将文件上载到Google云存储，您需要

StorageOptions

服务。您可以查看有关的文档

这将上传

你好，云存储字符串到名为
bucket
的bucket中名为
blob\u name
的文件。您只需根据项目的需要更改名称

上载一个本地文件。创建一个函数，该函数将读取文件的数据，并将其返回到将数据上载到bucket的主函数

我自己编写了一点代码，下面的代码，成功地上传了包含您上面提到的数据的文件


读取文件的函数：

它将从本地存储（如Cloud Shell）读取文件，并返回所有数据

private String readFile(){
      // The name of the file to open.
        String fileName = "PATH/TO/THE/FILE/THAT/IS/GOING/TO/BE/UPLOADED/FILE_NAME/xml";

        // This will reference one line at a time
        String line = null;
        // This will be the full file after reading
        String output = "";

        try {
            // FileReader reads text files in the default encoding.
            FileReader fileReader = 
                new FileReader(fileName);

            // Always wrap FileReader in BufferedReader.
            BufferedReader bufferedReader = 
                new BufferedReader(fileReader);

            while((line = bufferedReader.readLine()) != null) {
                System.out.println(line);
                output = output + line;
            }   

            // Always close files.
            bufferedReader.close();         
        }
        catch(FileNotFoundException ex) {
            System.out.println(
                output = output + "Unable to open file '" + fileName + "'";         
        }
        catch(IOException ex) {
            System.out.println( 
                output = output + "Error reading file '" + fileName + "'";         
        }

      return output;
  }


上传功能：

它将使用从文件中读取的所有数据，并将它们上传到bucket中的新文件中。文档代码之间的区别在于调用
…readFile（）.getBytes（UTF_8）.
的位置。我们添加了一个函数，该函数将返回上传的所有数据，而不是字符串

public String uploadFile(){

        String bucket_name = "BUCKET_NAME";
        String file_name = "PATH/TO/WHERE/THE/FILE/WILL/BE/UPLOADED/FILE_NAME.xml"

        Storage storage = StorageOptions.getDefaultInstance().getService();
        BlobId blobId = BlobId.of(bucket_name, file_name);
        BlobInfo blobInfo = BlobInfo.newBuilder(blobId).setContentType("text/plain").build();
        Blob blob = storage.create(blobInfo, readFile().getBytes(UTF_8));
}

我遵循相同的步骤，现在我得到了如下错误：
XML解析错误：语法错误位置：第1行第1列：无法打开文件'https://storage.googleapis.com/The 我提供的代码仅在您希望将文件从本地存储上传到
谷歌云存储
中的存储桶时有效。您遇到的错误指定您正试图从Google云存储桶中访问和读取文件。在这种情况下，方法将有所不同。你能告诉我你要读的文件存储在哪里吗？您是否试图将文件从一个Google云存储桶复制到另一个存储桶？似乎存在冲突库。你愿意分享你的依赖关系吗？（pom.xml或build.gradle）特别是谷歌云存储库和番石榴。
public String uploadFile(){

        String bucket_name = "BUCKET_NAME";
        String file_name = "PATH/TO/WHERE/THE/FILE/WILL/BE/UPLOADED/FILE_NAME.xml"

        Storage storage = StorageOptions.getDefaultInstance().getService();
        BlobId blobId = BlobId.of(bucket_name, file_name);
        BlobInfo blobInfo = BlobInfo.newBuilder(blobId).setContentType("text/plain").build();
        Blob blob = storage.create(blobInfo, readFile().getBytes(UTF_8));
}