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我創建了3個類：第一個用於連接（Connectionx），第二個用於填充UI作爲複選框，selectonemenu（BeanTools），第三個用於我的「操作」（NumberOfIssue）。 1）我想連接數據庫的問題只有一次，我已經完成了類Connectionx中的連接，並且我想在所有Beans上使用相同的連接。但是我不知道我是如何嘗試添加proprity連接到託管bean，但我不知道這是很好的解決方案，如果是它這麼想的，我:(工作，也有我的類新：如何在我的所有豆子中使用一個連接？
**1/Class Connectionx**
public class Connectionx implements java.io.Serializable{
public Connection cx=null;
public Statement st;
public Connectionx() {}
public Connection Connx()
{
System.out.println("enregister le driver");
try {
Class.forName("com.mysql.jdbc.Driver");
}
catch(Exception ex)
{
System.err.println("Erreur lors du chargement du driver"+ex.getMessage());
}
try {
/** Connection */
cx = (Connection) DriverManager.getConnection("jdbc:mysql://localhost/jiradb","root","root");
System.out.println("conexion reussite ");
}
catch(SQLException ex)
{
System. err. println("Erreur lors de la connexion à la baseeeeee");
}
return cx;
}
public void deConnx(Connection cx) throws SQLException{
cx.close();
System. err. println("deconnection");
}
}
2 /類BeanTools
public class BeanTools implements java.io.Serializable {
/***************selectonemenu***********************/
private List<SelectItem> mesElements;
private String maValeur;
public String[] favNumber1 ; //checkbox
public PreparedStatement st;
public Connectionx cx = new Connectionx();
public Connection con = (Connection)cx.Connx();
/**************checkbox***************/
public BeanTools() {
}
public String getMaValeur() {
return maValeur;
}
public void setMaValeur(String maValeur) {
this.maValeur = maValeur;
}
public String[] getFavNumber1() {
return favNumber1;
}
public void setFavNumber1(String[] favNumber1) {
this.favNumber1 = favNumber1;
}
public String getFavNumber1InString() {
return Arrays.toString(favNumber1);
}
public String getFavNumber1onebyone()
{ String Val =null;
for(int i=0;i<favNumber1.length;i++)
{
if (favNumber1[i].equals("1"))
System.out.println("priority checked");
if (favNumber1[i].equals("2"))
System.out.println("project checked");
if (favNumber1[i].equals("3"))
System.out.println("Month checked");
}
return Val;
}
public Iterable<String> remplireItem() throws ClassNotFoundException, SQLException
{
String sql;
sql ="select issuestatus.pname from issuestatus;";
System.out.println("sql");
st=(PreparedStatement) con.prepareStatement(sql);
ResultSet rs1 = st.executeQuery();System.out.println("execute");
String val;
ArrayList<String> list = new ArrayList<String>();
while(rs1.next())
{
val= rs1.getString("pname");
System.out.println(val);
list.add(nbb);
System.out.println("list"+list.toString());
}
return list;
}
public List<SelectItem> getMesElements() throws SQLException,ClassNotFoundException {
if (mesElements == null) {
mesElements = new ArrayList<SelectItem>();
for (String val : remplireItem()) {
mesElements.add(new SelectItem(val));
}
}
return mesElements;
}
3 /類NumberOfIssue
public class NumberOfIssue implements java.io.Serializable{
public String numberIssue;
private String maValeur;
public Connectionx cx = new Connectionx();
public Connection con = (Connection)cx.Connx();
public PreparedStatement st;
public NumberOfIssue() {
}
public String getMaValeur() {
return maValeur;
}
public void setMaValeur(String maValeur) {
this.maValeur = maValeur;
}
public String getNumberIssue() throws SQLException
{
//Connection con
BeanTools beTools=new BeanTools();
System.out.println("beTools.maValeur");
String sql;
sql ="select count(OS_CURRENTSTEP.entry_id) as nbissue ,project.pname,priority.pname,issuetype.pname from OS_CURRENTSTEP,jiraissue,issuestatus,issuetype,project,resolution,customfield ,customfieldvalue,priority where OS_CURRENTSTEP.entry_id = jiraissue.id and jiraissue.priority=priority.id and jiraissue.issuestatus=issuestatus.id and issuestatus.pname="+maValeur+" and jiraissue.issuetype=issuetype.id and jiraissue.project=project.id and resolution.id=jiraissue.resolution and resolution.pname='Fixed' Group By project.pname,priority.pname,issuetype.pname;";
st= (PreparedStatement) con.prepareStatement(sql);
ResultSet rs1 = st.executeQuery();
while(rs1.next())
{
numberIssue= rs1.getString(1);
String strissue2= rs1.getString(2);
String strissue3= rs1.getString(3);
System.out.println("nb issue "+numberIssue.toString()+" ||project "+strissue2.toString()+" ||proiority "+strissue3.toString());
}
return numberIssue;
}
}
4/Managed Bean的
<managed-bean>
<managed-bean-name>Connectionx</managed-bean-name>
<managed-bean-class>KPIs.Connectionx</managed-bean-class>
<managed-bean-scope>session</managed-bean-scope>
</managed-bean>
<managed-bean>
<managed-bean-name>BeanTools</managed-bean-name>
<managed-bean-class>KPIs.BeanTools</managed-bean-class>
<managed-bean-scope>session</managed-bean-scope>
<managed-property>
<property-name>cx</property-name>
<property-class>java.sql.Connection</property-class>
<value>#{Connectionx.cx}</value>
</managed-property>
</managed-bean>
<managed-bean>
<managed-bean-name>NumberOfIssue</managed-bean-name>
<managed-bean-class>KPIs.NumberOfIssue</managed-bean-class>
<managed-bean-scope>session</managed-bean-scope>
<managed-property>
<property-name>maValeur</property-name>
<property-class>java.lang.String</property-class>
<value>#{BeanTools.maValeur}</value>
</managed-property>
<managed-property>
<property-name>cx</property-name>
<property-class>java.sql.Connection</property-class>
<value>#{Connectionx.cx}</value>
</managed-property>
</managed-bean>
<navigation-rule>
<from-view-id>/welcomeJSF.jsp</from-view-id>
<navigation-case>
<from-outcome>submit</from-outcome>
<to-view-id>/Result.jsp</to-view-id>
</navigation-case>
</navigation-rule>
</faces-config>
堆棧跟蹤
com.sun.faces.mgbean.ManagedBeanCreationException: Impossible de créer le bean géré BeanTools. Les problèmes suivants ont été détectés :
- La propriété cx du bean géré BeanTools nexiste pas.
at com.sun.faces.mgbean.BeanManager.create(BeanManager.java:265)
at com.sun.faces.el.ManagedBeanELResolver.resolveBean(ManagedBeanELResolver.java:244)
at com.sun.faces.el.ManagedBeanELResolver.getValue(ManagedBeanELResolver.java:116)
at com.sun.faces.el.DemuxCompositeELResolver._getValue(DemuxCompositeELResolver.java:176)
at com.sun.faces.el.DemuxCompositeELResolver.getValue(DemuxCompositeELResolver.java:203)
at org.apache.el.parser.AstIdentifier.getValue(AstIdentifier.java:71)
at org.apache.el.parser.AstValue.getValue(AstValue.java:147)
at org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:189)
at org.apache.jasper.el.JspValueExpression.getValue(JspValueExpression.java:106)
at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:193)
at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:181)
at javax.faces.component.UIOutput.getValue(UIOutput.java:169)
at com.sun.faces.renderkit.html_basic.MenuRenderer.getCurrentSelectedValues(MenuRenderer.java:648)
at com.sun.faces.renderkit.html_basic.MenuRenderer.renderOptions(MenuRenderer.java:749)
at com.sun.faces.renderkit.html_basic.MenuRenderer.renderSelect(MenuRenderer.java:844)
at com.sun.faces.renderkit.html_basic.MenuRenderer.encodeEnd(MenuRenderer.java:298)
at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:883)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1659)
at javax.faces.render.Renderer.encodeChildren(Renderer.java:168)
at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:853)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1652)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1655)
at com.sun.faces.application.view.JspViewHandlingStrategy.doRenderView(JspViewHandlingStrategy.java:431)
at com.sun.faces.application.view.JspViewHandlingStrategy.renderView(JspViewHandlingStrategy.java:233)
at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:131)
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:121)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:313)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:393)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:164)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:498)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:562)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:394)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:243)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:188)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:302)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
我試過sql =「select count（OS_CURRENTSTEP.entry_id）作爲nbissue，project.pname，priority .pname，從OS_CURRENTSTEP，jiraissue，issuestatus，問題類型，項目，分辨率的CustomField，customfieldvalue，issuetype.pname優先這裏OS_CURRENTSTEP.entry_id = jiraissue.id和jiraissue.priority = priority.id和jiraissue.issuestatus = issuestatus.id和issuestatus .pname =？「 st.setNString（1，maValeur）;調用'setNString'之前顯示java.lang.NullPointerException – rym 2011-06-09 13:02:21
您有一個稱爲'prepareStatement'：但這個錯誤出現（NULL）怎麼引起的？順便說一下，如果你想用更少的麻煩來使用JDBC，那麼Spring的JDBC幫助器類非常好。 – artbristol 2011-06-09 13:10:08
謝謝我不知道Spring JDBC我會看看:) – rym 2011-06-09 16:12:45