小编Viv*_*kar的帖子

我编写了一个android程序,用于从Web服务向tablerow加载值.但是一个值为null,所以我需要将它转换为字符串.有人可以告诉我这样做的方法.

try{                    

    SoapObject request = service.getRequest();
    SoapSerializationEnvelope envelope = service.getEnvelope(request);
    SoapObject response = service.getResponse(envelope);
    Log.i("Service Master", response.toString());
    int count = response.getPropertyCount();
    for (int i = 0; i < count; i++) {
        SoapObject result = (SoapObject) response.getProperty(i);
        DeleteuserDetails deleteuserDetails=new DeleteuserDetails();
        deleteuserDetails.setUserId(result.getPropertyAsString(4));
        deleteuserDetails.setUserName(result.getPropertyAsString(2));
        deleteuserDetails.setUserRole(result.getPropertyAsString(3));
        deleteuserDetails.setCreatedDate(result.getPropertyAsString(1));
        deleteuserDetails.setCreatedBy(result.getPropertyAsString(0));
        userdetail.add(deleteuserDetails);
    }

现在deleteuserDetails.setCreatedBy(result.getPropertyAsString(0));从webservice获取null值,所以我需要将其转换为字符串"null".

logcat的:

12-20 18:48:52.608: W/System.err(2174): java.lang.NullPointerException
12-20 18:48:52.608: W/System.err(2174):     at org.ksoap2.serialization.SoapObject.getPropertyAsString(SoapObject.java:165)
12-20 18:48:52.608: W/System.err(2174):     at com.mvss.admin.Deleteuser$deteUserIdLoad.doInBackground(Deleteuser.java:81)
12-20 18:48:52.608: W/System.err(2174):     at com.mvss.admin.Deleteuser$deteUserIdLoad.doInBackground(Deleteuser.java:1)
12-20 18:48:52.608: W/System.err(2174):     at android.os.AsyncTask$2.call(AsyncTask.java:185)
12-20 18:48:52.608: W/System.err(2174):     at …

我在java中编写了一个java程序,按字母顺序对字符串进行排序.问题是当它对具有罗马数字的字符串进行排序时,它将其视为字符并相应地进行排序

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
public class SampleCustomSortApp
{
    @SuppressWarnings("unchecked")
    public static void main(String[] args)
    {
        ArrayList<String> titles =new ArrayList();
        titles.add("java");
        titles.add("J-IV");
        titles.add("A-V");
        titles.add("J-V");
        titles.add("J-IX");
        titles.add("J-XX");
        titles.add("J-X");
        titles.add("J-I");
        titles.add("J-II");

        titles.add("datawarehouse");
        titles.add("oracledba");
        System.out.println("Before Sorting Elements Are :"+titles+"\n");
        Collections.sort(titles, new MyCustomCompator());
        System.out.println("After Sorting Elements Are :"+titles);
    }
}
class MyCustomCompator implements Comparator
{
    public int compare(Object s1,Object s2)
    {
        String one = (String)s1;
        String two = (String)s2;
        /* for ascending order */
        if(one.compareTo(two)>0){
            return 1;
        }else{
            return -1;
        }
    } …

我写了一个liferay richfaces portlet.但是我无法在web-inf文件夹中获取css路径或图像.我的portlet配置是

 <portlet>
    <portlet-name>testLR6_PB3_RF4</portlet-name>
    <instanceable>true</instanceable>

    <render-weight>1</render-weight>
    <ajaxable>true</ajaxable>
    <header-portlet-css>/resources/css/style.css</header-portlet-css>
        <header-portlet-javascript>/js/eims.js</header-portlet-javascript>
        <footer-portlet-javascript>/js/fileupload.js</footer-portlet-javascript>
  </portlet>

并在我的jsf页面

<link href="${facesContext.externalContext.requestContextPath}/resources/css/style.css" rel="stylesheet" type="text/css" />

<div class="floatleft1"><img src="${facesContext.externalContext.requestContextPath}/resources/images/eims_logo.jpg"  /></div>

如何获得资源路径.

这是我的java servletcontext代码

FacesContext context = FacesContext.getCurrentInstance();
        ServletContext servletContext= (ServletContext) context.getCurrentInstance().getExternalContext().getContext();
        String path=servletContext.getRealPath("/");
        MainBean mainBean = new MainBean();
        mainBean.getUserBean().setUserPath(path);