在实体类中定义一个editable属性，并设置访问器

public class Order{
   

    String orderNo;
    String productName;
    BigDecimal price;
    int qty;

    boolean editable;

    public boolean isEditable() {
        return editable;
    }
    public void setEditable(boolean editable) {
        this.editable = editable;
    }

将此属性关联到页面的行上

<h:dataTable value="#{order.orderList}" var="o">

<h:column>

        <f:facet name="header">Action</f:facet>

        <h:commandLink value="修改" action="#{managedBean.editAction(o)}" rendered="#{not o.editable}" />

</h:column>

有梯子才能看到的具体代码：

package com.mkyong;

import java.io.Serializable;
import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.Arrays;

import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;

@ManagedBean(name="order")
@SessionScoped
public class OrderBean implements Serializable{
   

    private static final long serialVersionUID = 1L;

    private static final ArrayList<Order> orderList = 
        new ArrayList<Order>(Arrays.asList(

        new Order("A0001", "Intel CPU", 
                new BigDecimal("700.00"), 1),
        new Order("A0002", "Harddisk 10TB", 
                new BigDecimal("500.00"), 2),
        new Order("A0003", "Dell Laptop", 
                new BigDecimal("11600.00"), 8),
        new Order("A0004", "Samsung LCD", 
                new BigDecimal("5200.00"), 3),
        new Order("A0005", "A4Tech Mouse", 
                new BigDecimal("100.00"), 10)
    ));

    public ArrayList<Order> getOrderList() {

        return orderList;

    }

    public String saveAction() {

        //get all existing value but set "editable" to false 
        for (Order order : orderList){
            order.setEditable(false);
        }

        //return to current page
        return null;

    }

    public String editAction(Order order) {

        order.setEditable(true);
        return null;
    }

    public static class Order{
   

        String orderNo;
        String productName;
        BigDecimal price;
        int qty;
        boolean editable;

        public Order(String orderNo, String productName, BigDecimal price, int qty) {
            this.orderNo = orderNo;
            this.productName = productName;
            this.price = price;
            this.qty = qty;
        }

        public boolean isEditable() {
            return editable;
        }
        public void setEditable(boolean editable) {
            this.editable = editable;
        }
        public String getOrderNo() {
            return orderNo;
        }
        public void setOrderNo(String orderNo) {
            this.orderNo = orderNo;
        }
        public String getProductName() {
            return productName;
        }
        public void setProductName(String productName) {
            this.productName = productName;
        }
        public BigDecimal getPrice() {
            return price;
        }
        public void setPrice(BigDecimal price) {
            this.price = price;
        }
        public int getQty() {
            return qty;
        }
        public void setQty(int qty) {
            this.qty = qty;
        }
    }
}

页面

<?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://java.sun.com/jsf/html" xmlns:f="http://java.sun.com/jsf/core" xmlns:ui="http://java.sun.com/jsf/facelets" >
    <h:head>
        <h:outputStylesheet library="css" name="table-style.css" />
    </h:head>
    <h:body>

        <h1>JSF 2 dataTable example</h1>
        <h:form>
            <h:dataTable value="#{order.orderList}" var="o" styleClass="order-table" headerClass="order-table-header" rowClasses="order-table-odd-row,order-table-even-row" >

                <h:column>

                    <f:facet name="header">Order No</f:facet>

                    <h:inputText value="#{o.orderNo}" size="10" rendered="#{o.editable}" />

                    <h:outputText value="#{o.orderNo}" rendered="#{not o.editable}" />

                </h:column>

                <h:column>

                    <f:facet name="header">Product Name</f:facet>

                    <h:inputText value="#{o.productName}" size="20" rendered="#{o.editable}" />

                    <h:outputText value="#{o.productName}" rendered="#{not o.editable}" />

                </h:column>

                <h:column>

                    <f:facet name="header">Price</f:facet>

                    <h:inputText value="#{o.price}" size="10" rendered="#{o.editable}" />

                    <h:outputText value="#{o.price}" rendered="#{not o.editable}" />

                </h:column>

                <h:column>

                    <f:facet name="header">Quantity</f:facet>

                    <h:inputText value="#{o.qty}" size="5" rendered="#{o.editable}" />

                    <h:outputText value="#{o.qty}" rendered="#{not o.editable}" />

                </h:column>

                <h:column>

                    <f:facet name="header">Action</f:facet>

                    <h:commandLink value="Edit" action="#{order.editAction(o)}" rendered="#{not o.editable}" />

                </h:column>

            </h:dataTable>

            <h:commandButton value="Save Changes" action="#{order.saveAction}" />

        </h:form>
    </h:body>

</html>

例子源代码：
http://download.csdn.net/download/erd8888/10163521