eclipse开发的一个天气预报插件总报java.io.FileNotFoundException异常

  1.Activator.java
package myplugin;

import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.ui.plugin.AbstractUIPlugin;
import org.osgi.framework.BundleContext;


public class Activator extends AbstractUIPlugin {

// The plug-in ID
public static final String PLUGIN_ID = "myplugin";

// The shared instance
private static Activator plugin;


public Activator() {
plugin = this;
}


public void start(BundleContext context) throws Exception {
super.start(context);
}


public void stop(BundleContext context) throws Exception {
plugin = null;
super.stop(context);
}


public static Activator getDefault() {
return plugin;
}


public static ImageDescriptor getImageDescriptor(String path) {
return imageDescriptorFromPlugin(PLUGIN_ID, path);
}
}

2. SampleAction.java

package myplugin.actions;



import org.eclipse.jface.action.IAction;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.IWorkbenchWindowActionDelegate;
import org.eclipse.jface.dialogs.MessageDialog;


public class SampleAction implements IWorkbenchWindowActionDelegate {
private IWorkbenchWindow window;

public void run(IAction action) {
WeatherDialog wd = new WeatherDialog("北京");
wd.setSize(400, 335);
wd.show();
}

public void selectionChanged(IAction action, ISelection selection) {
}


public void dispose() {
}

public void init(IWorkbenchWindow window) {
this.window = window;
}
}

3. WeatherDialog.java
package myplugin.actions;


import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.URL;

import javax.swing.JDialog;
import javax.swing.JEditorPane;

/**
* ＜p＞Title: WatherDialog＜/p＞
* ＜p＞Description: 这个是对话框类，用于显示指定城市的当天的天气预报＜/p＞
* ＜p＞Copyright: Copyright (c) 2010＜/p＞
* ＜p＞Company:UF SOFT＜/p＞
* @version 1.0
*/
public class WeatherDialog extends JDialog {
String city = "北京";

private JEditorPane jEditorPane = null;

public WeatherDialog(String city)
{
super();
this.city=city;
initialize();
}

/**
* This method initializes this
* @return void
*/
private void initialize()
{
this.setContentPane(getJEditorPane());
try
{
// 构建URL对象
URL url =new URL("http://weather.news.sina.com.cn/search.php? city="+city);
String temp="";
BufferedReader in
= new BufferedReader(new InputStreamReader(url.openStream()));
// 使用openStream得到一输入流并由此构造一个BufferedReader对象
String inputLine;
// 从输入流不断的读数据，直到读完为止
while ((inputLine = in.readLine()) != null)
temp=temp+inputLine+"\n";
// 关闭输入流
in.close();
String weather
=temp.substring ( temp.indexOf( "＜body"),
temp.lastIndexOf( "body＞")+5);

this.jEditorPane .setText(weather);
}
catch (Exception e)
{
e.printStackTrace();
}
this.setTitle("天气预报");
this.setSize(400, 166);

}
/**
* This method initializes jEditorPane
*
* @return javax.swing.JEditorPane
*/
private JEditorPane getJEditorPane()
{
if (jEditorPane == null)
{
jEditorPane = new JEditorPane();
jEditorPane.setContentType( "text/html");
}
return jEditorPane;
}
}

4.plugin.xml
<?xml version="1.0" encoding="UTF-8"?>
<?eclipse version="3.2"?>
<plugin>

   <extension
         point="org.eclipse.ui.actionSets">
      <actionSet
            label="Sample Action Set"
            visible="true"
            id="myplugin.actionSet">
         <menu
               label="我的按钮"
               id="sampleMenu">
            <separator
                  name="sampleGroup">
            </separator>
         </menu>
         <action
               label="天气预报" icon="icons/sample.gif"
               class="myplugin.actions.SampleAction"
               tooltip="Hello，Eclipse world"
               menubarPath="sampleMenu/sampleGroup"
               toolbarPath="sampleGroup"
               id="myplugin.actions.SampleAction">
         </action>
      </actionSet>
   </extension>

</plugin>


5.异常：
java.io.FileNotFoundException: http://weather.news.sina.com.cn/search.php? city=北京
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1439)
at java.net.URL.openStream(URL.java:1010)
at myplugin.actions.WeatherDialog.initialize(WeatherDialog.java:47)
at myplugin.actions.WeatherDialog.<init>(WeatherDialog.java:31)
at myplugin.actions.SampleAction.run(SampleAction.java:16)
at org.eclipse.ui.internal.PluginAction.runWithEvent(PluginAction.java:254)
at org.eclipse.ui.internal.WWinPluginAction.runWithEvent(WWinPluginAction.java:229)
at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:539)
at org.eclipse.jface.action.ActionContributionItem.access$2(ActionContributionItem.java:488)
at org.eclipse.jface.action.ActionContributionItem$5.handleEvent(ActionContributionItem.java:400)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:928)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3348)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2968)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:1914)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:1878)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:419)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
at org.eclipse.ui.internal.ide.IDEApplication.run(IDEApplication.java:95)
at org.eclipse.core.internal.runtime.PlatformActivator$1.run(PlatformActivator.java:78)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:92)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:68)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:400)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:177)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.eclipse.core.launcher.Main.invokeFramework(Main.java:336)
at org.eclipse.core.launcher.Main.basicRun(Main.java:280)
at org.eclipse.core.launcher.Main.run(Main.java:977)
at org.eclipse.core.launcher.Main.main(Main.java:952)
java.io.FileNotFoundException: http://weather.news.sina.com.cn/search.php? city=北京
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1439)
at java.net.URL.openStream(URL.java:1010)
at myplugin.actions.WeatherDialog.initialize(WeatherDialog.java:47)
at myplugin.actions.WeatherDialog.<init>(WeatherDialog.java:31)
at myplugin.actions.SampleAction.run(SampleAction.java:16)
at org.eclipse.ui.internal.PluginAction.runWithEvent(PluginAction.java:254)
at org.eclipse.ui.internal.WWinPluginAction.runWithEvent(WWinPluginAction.java:229)
at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:539)
at org.eclipse.jface.action.ActionContributionItem.access$2(ActionContributionItem.java:488)
at org.eclipse.jface.action.ActionContributionItem$5.handleEvent(ActionContributionItem.java:400)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:928)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3348)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2968)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:1914)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:1878)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:419)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
at org.eclipse.ui.internal.ide.IDEApplication.run(IDEApplication.java:95)
at org.eclipse.core.internal.runtime.PlatformActivator$1.run(PlatformActivator.java:78)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:92)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:68)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:400)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:177)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.eclipse.core.launcher.Main.invokeFramework(Main.java:336)
at org.eclipse.core.launcher.Main.basicRun(Main.java:280)
at org.eclipse.core.launcher.Main.run(Main.java:977)
at org.eclipse.core.launcher.Main.main(Main.java:952)

11 个解决方案

#1

URL url =new URL("http://weather.news.sina.com.cn/search.php? city="+city);

这个路径找不到咯.

#2

http://www.ceclipse.org/read-cec-tid-17071-page-1.html

#3

 http://weather.news.sina.com.cn/search.php? city=北京
这个URL错了，找不到。

把它直接复制到地址栏上，也是找不到的。

#4

那怎样改下地址？

#5

地址是要连接到新浪天气预报的网址

#6

http://php.weather.sina.com.cn/search.php?city= 这个吧 自己google一下就行了啊 汗

#7

看看你的url中的？有没有问题

#8

现在报一下异常：
（因为本人是新手，很多地方不懂，希望各位大虾批评教）
java.lang.StringIndexOutOfBoundsException: String index out of range: -1
at java.lang.String.substring(String.java:1931)
at myplugin.actions.WeatherDialog.initialize(WeatherDialog.java:56)
at myplugin.actions.WeatherDialog.<init>(WeatherDialog.java:31)
at myplugin.actions.SampleAction.run(SampleAction.java:16)
at org.eclipse.ui.internal.PluginAction.runWithEvent(PluginAction.java:254)
at org.eclipse.ui.internal.WWinPluginAction.runWithEvent(WWinPluginAction.java:229)
at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:539)
at org.eclipse.jface.action.ActionContributionItem.access$2(ActionContributionItem.java:488)
at org.eclipse.jface.action.ActionContributionItem$5.handleEvent(ActionContributionItem.java:400)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:928)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3348)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2968)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:1914)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:1878)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:419)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
at org.eclipse.ui.internal.ide.IDEApplication.run(IDEApplication.java:95)
at org.eclipse.core.internal.runtime.PlatformActivator$1.run(PlatformActivator.java:78)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:92)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:68)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:400)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:177)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.eclipse.core.launcher.Main.invokeFramework(Main.java:336)
at org.eclipse.core.launcher.Main.basicRun(Main.java:280)
at org.eclipse.core.launcher.Main.run(Main.java:977)
at org.eclipse.core.launcher.Main.main(Main.java:952)

#9

String index out of range: -1

#10

String 数组下标越界

#11

myplugin.actions.WeatherDialog的构造函数或者其他初始化函数中有数组越界情况

initialize()函数中字符解析有问题

PS：你WSM要用swing的JDialog，直接用JFace的Dialog多好，唉