小编cen*_*tic的帖子

我实现了Microsoft Excel文件的上传服务,无法确定上传了哪种文件.有时用户上传包含xlsx内容的xls扩展名的文件.要解析我使用Apache Poi的文件,目前我首先尝试将上传的文件解析为HSSFWorkbook,如果我发现异常,那么我尝试创建一个XSSFWorkbook.

有没有更聪明的方法来检测需要什么版本？

/** should parse the uploaded file */
private void handleUpload(File file) {
  Workbook wb = tryToHandleHSSF(file);
  if (wb==null)
    wb = tryToHandleXSSF(file);
  if (wb!=null) {
    // ... do the parsing stuff
  }
}

/** helper for HSSF */
private Workbook tryToHandleHSSF(File file) {
  try {
    return new HSSFWorkbook(new FileInputStream(file));
  }
  catch(Exception e) {
    return null;
  }
}

/** helper for XSSF */
private Workbook tryToHandleXSSF(File file) {
  Workbook workbook;
  try {
    InputStream fin = new FileInputStream(file);
    BufferedInputStream …

所以在下面的代码集中,由于某种原因,我得到了完全错误的答案......

import java.util.*;
import java.io.*;
import java.lang.*;
import type.lib.*;

public class Check03B

{
    public static void main(String[] args)
    {
        PrintStream print = new PrintStream(System.out);
        Scanner scan = new Scanner(System.in);
        print.printf("Enter the satellite altitude in km ... ");
        double A = scan.nextDouble();
        double K = 0.00995;
        double R = 6378;
        double z = (K * (A + R));
        double P = Math.pow(z,(3 / 2));
        double x = (P / 3600);
        double y = (P / 60);
        print.printf("Orbital period = " + …

我只看到LineChart并Scatter Charts默认支持Apache POI.

问题: 如何在spreadhsheet中添加其他图表类型..

任何想法或任何帮助？或者是否有任何理由让apache只支持这两种类型的图表.

我有一个单元测试,它使用Elasticsearch的集成测试框架.使用Elasticsearch 2.0.0-2.1.2执行时工作正常,但是当我在IntelliJ中运行最新的Elasticsearch 2.2.0时,我得到以下内容,知道需要调整哪些不使用IntelliJ中的安全管理器？

java.security.AccessControlException: access denied ("org.elasticsearch.ThreadPermission" "modifyArbitraryThreadGroup")

at java.security.AccessControlContext.checkPermission(AccessControlContext.java:472)
at java.security.AccessController.checkPermission(AccessController.java:884)
at java.lang.SecurityManager.checkPermission(SecurityManager.java:549)
at org.elasticsearch.SecureSM.checkThreadGroupAccess(SecureSM.java:166)
at org.elasticsearch.SecureSM.checkAccess(SecureSM.java:113)
at java.lang.ThreadGroup.checkAccess(ThreadGroup.java:315)
at java.lang.ThreadGroup.getParent(ThreadGroup.java:167)
at com.carrotsearch.randomizedtesting.Threads$2.run(Threads.java:127)
at com.carrotsearch.randomizedtesting.Threads$2.run(Threads.java:123)
at java.security.AccessController.doPrivileged(Native Method)
at com.carrotsearch.randomizedtesting.Threads.getTopThreadGroup(Threads.java:123)
at com.carrotsearch.randomizedtesting.Threads.getAllThreads(Threads.java:99)
at com.carrotsearch.randomizedtesting.ThreadLeakControl.<init>(ThreadLeakControl.java:348)
at com.carrotsearch.randomizedtesting.RandomizedRunner.runSuite(RandomizedRunner.java:673)
at com.carrotsearch.randomizedtesting.RandomizedRunner.access$200(RandomizedRunner.java:140)
at com.carrotsearch.randomizedtesting.RandomizedRunner$2.run(RandomizedRunner.java:591)

我正在尝试使用页面工厂和页面对象模型运行Java项目，我想在Chrome，IE和Firefox上运行它，但是我无法在Firefox上运行它，浏览器没有打开，我得到了这个错误： java.lang.NoClassDefFoundError: org/w3c/dom/ElementTraversal

我的代码是：

@BeforeMethod
public static void openBrowser() {
    String browser = "";
    if (browser.equalsIgnoreCase("chrome")){
        System.setProperty("webdriver.chrome.driver", "src\\test\\Resources\\BrowserDrivers\\chromedriver.exe");
        driver = new ChromeDriver();
    }
    else if (browser.equalsIgnoreCase("ie")){
        System.setProperty("webdriver.ie.driver", "src\\test\\Resources\\BrowserDrivers\\IEDriverServer.exe");
        driver = new InternetExplorerDriver();
    }
    else {
        driver = new FirefoxDriver();
    }
    driver = new FirefoxDriver();
    driver.get("http://www.google.com/");
    driver.manage().timeouts().implicitlyWait(20, TimeUnit.SECONDS);
    driver.manage().window().maximize();
}

@AfterMethod
public  static void closeBrowser(){
    driver.quit();
}

我编写了应该创建 Excel 文件（xlsx 或 xls）并将自定义背景颜色设置为单元格的代码。创建 xls 文件时，背景颜色工作正常，但在 xlsx 的情况下，背景颜色未设置为正确的颜色。

我的代码有什么问题？

public class PoiWriteExcelFile {
static Workbook workbook; 
static Sheet worksheet;

public static void main(String[] args) {
    try {
        String type = "xlsx"; //xls
        FileOutputStream fileOut = new FileOutputStream("D:\\poi-test." + type);            
        switch (type) {
        case "xls":
            workbook = new HSSFWorkbook();              
            break;              
        case "xlsx":
            workbook = new XSSFWorkbook();              
            break;          
        }

        CellStyle cellStyle = workbook.createCellStyle();
        switch (type) {
        case "xls":
            HSSFPalette palette = ((HSSFWorkbook) workbook).getCustomPalette();
             palette.setColorAtIndex(HSSFColor.LAVENDER.index, (byte)128, (byte)0, (byte)128);
             HSSFColor hssfcolor = palette.getColor(HSSFColor.LAVENDER.index); …