Struts2+DAO+ExtJS 框架征程才开始_step1

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Struts2

DAO 框架 EXT json SQL

最近开始着手struts2的学习，版本是struts-2.0.6，倒腾了一个多月了，零零散散的，想法一直在改变，起先就是想做个普通的信息管理系统，用struts2+JSP，接着发现web页面太丑，我不会界面操作，对于html语言也只是停留在简单的能看，想起来以前接触过ExtJs，哎呀，现成的界面做好调用就可以岂不快哉，说干就干下了个ext-2.0.2.，一晚上加一上午加一下午终于调通了，暂时可以把数据利用DAO的方式简单的从mysql5.1里提取然后显示在Ext的表格（grid）上了==! 似不似很丢人

效果图如下：

好吧，我想你看出来了我是个小菜鸟，原谅我吧，我有大牛的梦想的啦，有兴趣的话看看我接下来的具体实施吧，其实还是很纠结的

开发工具 MyEclipse5.5.1,部署如下：

DAO模式连接数据库

package DAO;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

// 连接数据库,配置数据库
public class DAOBase implements DAO {
    public Connection getConnection()  {  
		String connectURL = "jdbc:mysql://localhost/test";
		String user = "root";
		String password = "123";
		try{
		Class.forName("com.mysql.jdbc.Driver");// 加载驱动程序
		Connection connection = DriverManager.getConnection(connectURL, user, password);

        return connection;
		}catch (SQLException e) {
			e.printStackTrace();
		}catch (Exception e) {
			e.printStackTrace();

		}
		return null;
			
    }
   
}

struts2作为图文表现层，使模型和动作分开，Employee.java模型类

package entity;

public class Employee {
    private int id;
    private String firstName;
    private String lastName;

    public Employee() {
    }

    public Employee(int id, String firstName, String lastName) {
        this.id = id;
        this.firstName = firstName;
        this.lastName = lastName;
    }
    public String getFirstName() {
        return firstName;
    }
    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }
    public String getLastName() {
        return lastName;
    }
    public void setLastName(String lastName) {
        this.lastName = lastName;
    }
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    
    //转化为JSON格式
    public String toString() {
        return "{id:" + id +
        	",firstName:'" + firstName +
            "',lastName:'" + lastName +
            "'}";
    }
}

EmployeeActioin.java动作类

package entity;
import entity.Employee;
import entity.EmployeeManager;

import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.Preparable;
import java.util.List;
import com.opensymphony.xwork2.ModelDriven;

// 使用ModelDriven拦截器
public class EmployeeAction extends ActionSupport implements Preparable,ModelDriven{
	private static final long serialVersionUID = 1L;

	private Employee employee;

	private int employeeId;

	private List<Employee> employees;
	

//ModelDriven拦截器自动调用的方法
	public Object getModel(){
		return employee;
	}
//Prepable拦截器自动调用的方法	
    public void prepare() throws Exception {
        if (employeeId == 0) {
            employee = new Employee();
        } else {
            employee = EmployeeManager.find(employeeId);
        }
    }
	
//	set、get方法
	public int getEmployeeId() {
		return employeeId;
	}

	public void setEmployeeId(int employeeId) {
		this.employeeId = employeeId;
	}

	public List<Employee> getEmployees() {
		return employees;
	}

	public Employee getEmployee() {
		return employee;
	}

	public void setEmployee(Employee employee) {
		this.employee = employee;
	}

	public void setEmployees(List<Employee> employees) {
		this.employees = employees;
	}

//方法
	public String list() {
		employees = EmployeeManager.getEmployees();
		return SUCCESS;
	}

	public String create() {
		EmployeeManager.create(employee);
		return SUCCESS;
	}

	public String edit() {
		return SUCCESS;
	}

	public String update() {
		EmployeeManager.update(employee);
		employees = EmployeeManager.getEmployees();
		return SUCCESS;
	}

	public String delete() {
		EmployeeManager.delete(employeeId);
		employees = EmployeeManager.getEmployees();
		return SUCCESS;
	}
	
}

页面显示的关键类EmployeeDAOMySQLImpl.java，截取关键的search方法用于执行sql语句提取数据库数据填充对象Employee对象，放入List<Employee>中储存，并返回。。

public List<Employee> searchEmployees(EmployeeSearchCriteria searchCriteria)
			throws DAOException {

		List<Employee> employees = new ArrayList<Employee>();
		Connection connection = null;
		Statement statement = null;
		ResultSet resultSet = null;

		// Build the search criterias
		StringBuilder criteriaSql = new StringBuilder(512);
		criteriaSql.append(SEARCH_EMPLOYEES_SQL);
		if (searchCriteria.getFirstName() != null) {
			criteriaSql.append("firstName LIKE '%"
					+ DBUtil.fixSqlFieldValue(searchCriteria.getFirstName())
					+ "%' AND ");
		}
		if (searchCriteria.getLastName() != null) {
			criteriaSql.append("lastName LIKE '%"
					+ DBUtil.fixSqlFieldValue(searchCriteria.getLastName())
					+ "%' AND ");
		}
		// Remove unused 'And' & 'WHERE'
		if (criteriaSql.substring(criteriaSql.length() - 5).equals(" AND "))
			criteriaSql.delete(criteriaSql.length() - 5,
					criteriaSql.length() - 1);
		if (criteriaSql.substring(criteriaSql.length() - 7).equals(" WHERE "))
			criteriaSql.delete(criteriaSql.length() - 7,
					criteriaSql.length() - 1);

		try {

			/*
			 * 注意和上述几种方法中的 PreparedStatement比较，此处用的是statement
			 */
			connection = getConnection();
			statement = connection.createStatement();
			// System.out.println(criteriaSql.toString());
			resultSet = statement.executeQuery(criteriaSql.toString());
			while (resultSet.next()) {
				Employee employee = new Employee();
				employee.setId(resultSet.getInt("id"));
				employee.setFirstName(resultSet.getString("firstName"));
				employee.setLastName(resultSet.getString("lastName"));
				employees.add(employee);
				System.out.println("运行到employee.toString():"+ employee.toString());
			}

			resultSet.close();
			statement.close();
		} catch (SQLException e) {
			throw new DAOException();
		} finally {
			try {
				connection.close();
			} catch (SQLException ex) {
			}
		}
		System.out.println("运行到searchEmployees(……)" + employees);
		return employees;
	}

此时employees里存储了从底层数据库提取的数据，格式是：

[{id:1,firstName:'hu',lastName:'ying'}, {id:2,firstName:'gan',lastName:'likun'}]

可是Ext能够读取的格式是json的，如下：

{employee:[{id:1,firstName:'hu',lastName:'ying'}, {id:2,firstName:'gan',lastName:'likun'}]}

困扰了很久的难点就在这儿，于是在参考了《深入浅出Ext JS》的基础下，我决定红圈圈里动刀子了

list.jsp

<%@ page contentType="application/json;charset=utf-8" import="entity.*" %><%
    request.setCharacterEncoding("utf-8");
    response.setCharacterEncoding("utf-8");
    out.print("{employee:"+EmployeeManager.getEmployees()+"}");
    System.out.println("运行到list.jsp   "+"{employee:"+EmployeeManager.getEmployees()+"}");
%>

student.js

Ext.onReady(function() {

    Ext.QuickTips.init();

    var StudentRecord = Ext.data.Record.create([
        {name: 'id', type: 'int'},
        {name: 'firstName', type: 'string'},
        {name: 'lastName', type: 'string'}
    ]);

    var store = new Ext.data.Store({
        proxy: new Ext.data.HttpProxy({url: './list.jsp'}),
        reader: new Ext.data.JsonReader({
            root: 'employee'
        },StudentRecord),
        remoteSort: true
    });
    store.load({params:{start:0,limit:15}});

    var columns = new Ext.grid.ColumnModel([
        {header: '编号', dataIndex: 'id'},
        {header: '姓氏', dataIndex: 'firstName'},
        {header: '名称', dataIndex: 'lastName'}
    ]);
    columns.defaultSortable = true;

    // grid start
    var grid = new Ext.grid.GridPanel({
        title: '学生信息列表',
        region: 'center',
        loadMask: true,
        store: store,
        cm: columns,
        sm: new Ext.grid.RowSelectionModel({singleSelect:true}),
        viewConfig: {
            forceFit: true
        },
        bbar: new Ext.PagingToolbar({
            pageSize: 15,
            store: store,
            displayInfo: true
        })
    });
    // grid end


    // 单击修改信息 start
    grid.on('rowclick', function(grid, rowIndex, event) {
        var record = grid.getStore().getAt(rowIndex);
        form.getForm().loadRecord(record);
        form.buttons[0].setText('修改');
    });
    // 单击修改信息 end

    // layout start
    var viewport = new Ext.Viewport({
        layout: 'border',
        items: [{
            region: 'north',
            contentEl: 'head'
        }, grid]
    });
    // layout end
});

于是小攻告成，有了开始的那个久违的画面，时间仓促，讲解不详细，等我大功告成的时候再补全咯