试图建立一个要在多个地方使用的列表

问题描述 投票：0回答：1

我正在尝试开发和理解类与jsf标签之间的通信。我发现jsf标记直接使用类而不创建任何实例，而当需要在bean之间进行通信时，必须构建该类的实例。迫切需要动态列表，然后将选定的值复制到不同的Bean中，我试图为动态列表构建自定义标签，但在需要将选定的值复制到Bean时需要保留其他Bean的值时遇到了麻烦用于构建列表。

以下是最小的可复制示例

pinnacleTags.taglib.xml

<?xml version="1.0" encoding="UTF-8"?>
<facelet-taglib>
    <namespace>pinnacleTags/facelets</namespace>
    <tag>
        <tag-name>PinnacleCombo</tag-name>
        <source>pinnacleCombo.xhtml</source>
        <attribute>
            <name>actionListenerBeanMethod</name>
        </attribute>
    </tag>
</facelet-taglib>

列表标签

<?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:ui="http://xmlns.jcp.org/jsf/facelets"
      xmlns:p="http://primefaces.org/ui"
      xmlns:o="http://omnifaces.org/ui"
      xmlns:f="http://xmlns.jcp.org/jsf/core">
    <h:head>
    </h:head>
    <h:body>
        <ui:composition> 
            <o:methodParam name="method" value="#{actionListenerBeanMethod}" />
            <p:dialog id="dlgTBL" modal="true" showEffect="bounce" widgetVar="dlg" resizable="false">
                <p:dataTable var="result" id="tbl" widgetVar="dtlTBL"
                                    value="#{liveRangeService.tableData}" 
                                    paginator="false"
                                    scrollable="true"  rowIndexVar="rowindex"  scrollHeight="500" 
                                    scrollRows="50" liveScroll="true"
                                    filterDelay="1100"
                                    selectionMode="single" selection="#{liveRangeService.selectedData}"
                                    rowKey="#{liveRangeService.sr}"
                    >
                    <p:ajax event="rowSelect" listener="#{liveRangeService.onRowSelect(rowindex)}"  />
                    <f:facet name="header">
                        <p:outputPanel layout="inline" styleClass="tabSpacer">
                            <h:outputText value="Global Filter:" />
                            <p:inputText id="globalFilter" onkeyup="PF('dtlTBL').filter()" style="width:150px;margin-left:10px;"/>
                        </p:outputPanel>
                    </f:facet>

                    <p:column width="50">
                        <f:facet name="header">
                            <h:outputText value="Sr." />
                        </f:facet>
                        <p:commandButton value="#{rowindex}" style="width: 49px" action="#{method}"/>
                    </p:column>

                    <p:columns value="#{liveRangeService.tableHeaderNames}"
                               var="mycolHeader" 
                               width="#{colIndex==0?'10%':colIndex==1?'70%':colIndex==2?'10%':colIndex==3?'10%':'0'}" 
                               columnIndexVar="colIndex" 
                               sortBy="#{result[mycolHeader]}"
                               filterBy="#{result[mycolHeader]}"
                               filterMatchMode="contains"                        
                               >
                        <f:facet name="header">
                            <h:outputText value="#{mycolHeader}" />
                        </f:facet>
                        <h:outputText value="#{result[mycolHeader]}" />
                        <br />
                    </p:columns>

                </p:dataTable>
            </p:dialog>
        </ui:composition>
    </h:body>
</html>

动态列表Bean

package classes;

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
import java.io.Serializable;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.faces.bean.ApplicationScoped;
import javax.faces.bean.ManagedBean;
import org.primefaces.PrimeFaces;

@ManagedBean(name="liveRangeService", eager = true)
@ApplicationScoped

public class LiveRangeService implements Serializable {
    private List< Map<String, String> > tableData;
    private Map<String, String> selectedData;
    private List< Map<String, String> > filteredData;
    private int sr;
    private List<String> tableHeaderNames;
    private String tableColWidths;
    private List< Map<String, String> > selectedRow;
    private String RowSelected;
    private String CopyValuesToClass;
    private String CopyToField;
    Object o;

    public String getRowSelected() {
        return RowSelected;
    }

    public void setRowSelected(String RowSelected) {
        this.RowSelected = RowSelected;
    }

    public Map<String, String> getSelectedData() {
        return selectedData;
    }

    public void setSelectedData(Map<String, String> selectedData) {
        this.selectedData = selectedData;
    }

    public List<Map<String, String>> getTableData() {
        return tableData;
    }
    public List<String> getTableHeaderNames() {
        return tableHeaderNames;
    }

    public LiveRangeService() {
    }

    public void LiveRangeServicesss(String Dialogue, String CopyValuesToClass, String CopyToField) {
        System.out.println("Qry: " + Dialogue);
        this.CopyValuesToClass=CopyValuesToClass;
        this.CopyToField=CopyToField;
        tableData = new ArrayList< Map<String, String> >();
        tableHeaderNames = new ArrayList<String>();
        tableHeaderNames.add("ID");
        tableHeaderNames.add("Title");
        tableHeaderNames.add("Opn_Amt");
        tableHeaderNames.add("Smr_Amt");

        {
            Map<String, String> playlist = new HashMap<String, String>();
            playlist.put("ID", "1010001");
            playlist.put("Title", "Share Capital - Mr. 1");
            playlist.put("Opn_Amt", "0");
            playlist.put("Smr_Amt", "0");
            tableData.add(playlist);
        }

        {
            Map<String, String> playlist = new HashMap<String, String>();
            playlist.put("ID", "1010002");
            playlist.put("Title", "Share Capital - Mr. 2");
            playlist.put("Opn_Amt", "0");
            playlist.put("Smr_Amt", "0");
            tableData.add(playlist);
        }

        {
            Map<String, String> playlist = new HashMap<String, String>();
            playlist.put("ID", "1010003");
            playlist.put("Title", "Share Capital - Mrs. 3");
            playlist.put("Opn_Amt", "0");
            playlist.put("Smr_Amt", "0");
            tableData.add(playlist);
        }
        System.out.println("RowSelected Variable Values: " + this.sr + ", " + this.RowSelected);
        System.out.println("selectedData Select Table Values: " + this.sr + ", " + this.selectedData);

        PrimeFaces.current().ajax().update("form:dlgTBL");
        PrimeFaces.current().executeScript("PF('dlg').show();");
    }

    public List<Map<String, String>> getSelectedRow() {
        try {System.out.println("Selected Row! " + selectedRow.size());} catch (Exception e) {}

        return selectedRow;
    }

    public void setSelectedRow(List<Map<String, String>> selectedRow) {
//        System.out.println( "selected size: " + selectedRow.size() );
        this.selectedRow = selectedRow;
    }

    public String getTableColWidths() {
        return tableColWidths;
    }

    public void setTableColWidths(String tableColWidths) {
        this.tableColWidths = tableColWidths;
    }

    public List<Map<String, String>> getFilteredData() {
        return filteredData;
    }

    public void setFilteredData(List<Map<String, String>> filteredData) {
        this.filteredData = filteredData;
    }

    public void onRowSelect(int row) {

        System.out.println("Called For " + CopyValuesToClass + " To Copy Selected Value To " + CopyToField);
        try {
            test t = new test();
            t.id=1233;
            t.title="New Value 2";
            PrimeFaces.current().ajax().update("form:inp");
            PrimeFaces.current().ajax().update("form:inp1");
        } catch (Exception ee) {
            ee.printStackTrace();
        }
}

    public int getSr() {
        return sr;
    }

    public void setSr(int Sr) {
        this.sr = Sr;
    }
}

测试豆

package classes;


import java.io.Serializable;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */

/**
 *
 * @author Administrator
 */
@ManagedBean(name="test", eager = true)
@SessionScoped

public class test implements Serializable {
    public int id;
    public String title;

    public test() {
        id=1;
        title="Testing";
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

}

test1 Bean

package classes;


import java.io.Serializable;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */

/**
 *
 * @author Administrator
 */
@ManagedBean(name="test1", eager = true)
@SessionScoped

public class test1 implements Serializable {
    int id;
    String title;

    public test1() {
        id=10;
        title="Testing1";
    }
    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

}
java jsf reflection
1个回答
0
投票

假设您的问题是如何从applicationScoped test中访问sessionScopedLiveRangeServicebean：您不能简单地以这种方式实例化ManagedBean：

test t = new test();

实例由JSF Managed并按需实例化，其寿命由其范围定义。

请阅读How to access property of one managed bean in another managed bean和BalusC链接的博客文章Communication in JSF 2.0 - Injecting managed beans in each other。>

您的示例还有其他一些问题：

  1. 您的bean的范围似乎无法正确选择，请阅读How to choose the right bean scope?
  2. 您不遵循Java命名约定。类名应以大写字母开头，而字段和变量应以小写字母开头。例如。将class test重命名为class Test，将private String CopyValuesToClass;重命名为private String copyValuesToClass;
  3. 示例到目前为止不是最小
    4. 。您应该删除所有与理解问题无关的代码。
  4. [不赞成使用@ManagedBean，请考虑迁移到JSF和CDI的最新版本：Migrate JSF managed beans to CDI managed beans
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