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我已經嘗試了各種不同的是，但似乎無法設置「選定」變量。f：setPropertyActionListener沒有設置變量
的JavaBean：
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.Arrays;
import javax.annotation.Resource;
import javax.inject.Named;
import javax.enterprise.context.Dependent;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
import javax.sql.DataSource;
@Named(value = "lab3")
@Dependent
@ManagedBean
@SessionScoped
public class Lab3 {
public Lab3() {
}
@Resource (name="jdbc/sample") // This is the JNDI name
private DataSource ds;
private ArrayList<Cars> c = new ArrayList<>();
public ArrayList<Cars> getC() {
// Declare the JDBC objects.
Connection connection = null;
Statement statement = null;
ResultSet resultSet = null;
try {
// Establish the connection
connection = ds.getConnection("app", "app");
// Create and execute an SQL statement that returns some data.
String SQL = "SELECT * FROM cars";
statement = connection.createStatement();
resultSet = statement.executeQuery(SQL);
// Iterate through the data in the result set and each column
while (resultSet.next()) {
c.add(new Cars(resultSet.getInt("CARID"),
resultSet.getString("CARMAKE"),
resultSet.getString("CARMODEL"),
resultSet.getInt("CARYEAR")));
}
} // Handle any errors that may have occurred.
catch (SQLException e) {
System.out.println(Arrays.toString(e.getStackTrace()));
}
finally
{
try
{
if (resultSet != null)
resultSet.close();
if (statement != null)
statement.close();
if (connection != null)
connection.close();
}
catch (Exception ex) {
System.out.println ("Exception cleaning up Database objects " +
ex.getMessage());
}
}
return c;
}
public void setC(ArrayList<Cars> c) {
this.c = c;
}
private int selected;
/**
* Get the value of selected
*
* @return the value of selected
*/
public int getSelected() {
return selected;
}
/**
* Set the value of selected
*
* @param selected new value of selected
*/
public void setSelected(int selected) {
this.selected = selected;
}
private ArrayList<Mileage> m = new ArrayList<>();
public ArrayList<Mileage> getM() {
// Declare the JDBC objects.
Connection connection = null;
Statement statement = null;
ResultSet resultSet = null;
try {
// Establish the connection
connection = ds.getConnection("app", "app");
// Create and execute an SQL statement that returns some data.
String SQL = "SELECT * FROM mileage where mileagecarid = " + selected;
statement = connection.createStatement();
resultSet = statement.executeQuery(SQL);
// Iterate through the data in the result set and each column
while (resultSet.next()) {
m.add(new Mileage(resultSet.getInt("MILEAGEID"),
resultSet.getInt("MILEAGESTART"),
resultSet.getInt("MILEAGEEND"),
resultSet.getDouble("MILEAGEGASUSED")));
}
} // Handle any errors that may have occurred.
catch (SQLException e) {
System.out.println(Arrays.toString(e.getStackTrace()));
}
finally
{
try
{
if (resultSet != null)
resultSet.close();
if (statement != null)
statement.close();
if (connection != null)
connection.close();
}
catch (Exception ex) {
System.out.println ("Exception cleaning up Database objects " +
ex.getMessage());
}
}
return m;
}
public void setM(ArrayList<Mileage> m) {
this.m = m;
}
public String results() {
return "carresults";
}
}
的index.xhtml：
<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:h="http://xmlns.jcp.org/jsf/html"
xmlns:f="http://java.sun.com/jsf/core">
<h:head>
<title>Lab3</title>
</h:head>
<h:body>
<h:outputStylesheet library="css" name="style.css" />
<h:form>
<h:dataTable id="dbresults" value="#{lab3.c}" var="row" >
<h:column>
<f:facet name="header" >Make</f:facet>
<h:outputText value="#{row.carmake}">
</h:outputText>
</h:column>
<h:column>
<f:facet name="header" >Model</f:facet>
<h:outputText value="#{row.carmodel}">
</h:outputText>
</h:column>
<h:column>
<f:facet name="header" >Year</f:facet>
<h:outputText value="#{row.caryear}">
</h:outputText>
</h:column>
<h:column>
<f:facet name="header" >Details</f:facet>
<h:commandButton id="submit" value="Details" action="#{lab3.results}" >
<f:setPropertyActionListener target="#{lab3.selected}" value="#{row.carid}" />
</h:commandButton>
</h:column>
</h:dataTable>
</h:form>
</h:body>
</html>
carresults.xhtml：
<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:h="http://xmlns.jcp.org/jsf/html"
xmlns:f="http://java.sun.com/jsf/core">
<h:head>
<title>Lab3</title>
</h:head>
<h:body>
<h:outputStylesheet library="css" name="style.css" />
<h:outputText value="#{lab3.selected}" ></h:outputText>
<h:form>
<h:dataTable id="dbresults" value="#{lab3.m}" var="row" >
<h:column>
<f:facet name="header" >Start<br />(km)</f:facet>
<h:outputText value="#{row.mileagestart}">
</h:outputText>
</h:column>
<h:column>
<f:facet name="header" >End<br />(km)</f:facet>
<h:outputText value="#{row.mileageend}">
</h:outputText>
</h:column>
<h:column>
<f:facet name="header" >Trip<br />(km)</f:facet>
<h:outputText value="#{row.trip}">
</h:outputText>
</h:column>
<h:column>
<f:facet name="header" >Gas Used<br />(L)</f:facet>
<h:outputText value="#{row.mileagegasused}">
</h:outputText>
</h:column>
<h:column>
<f:facet name="header" >Fuel Economy<br />(L/100km)</f:facet>
<h:outputText value="#{row.litre}">
</h:outputText>
</h:column>
</h:dataTable>
</h:form>
</h:body>
</html>
我已輸出的頁carresults.xhtml的 「選擇」 變量和它總是返回零。
您是否嘗試過調試？當你點擊一個按鈕時setSelected被調用？ – Multisync 2014-10-17 05:46:48