[导入]引用 Dwr-EditTable完整版
引用
邵波的空间 的 Dwr-EditTable完整版
Dwr是Java领域一个著名的服务器端Ajax框架,借助 Dwr的帮助,我们可以直接在客户端页面通过Javascript调用远程Java的方法。
看 Dwr的示例中有一个EditTable的示例,觉得在实际使用中会非常的有用,就把此示例进行了扩展,实现与数据库的交互,在页面上可以直接添加用户、修改用户和删除用户操作。
数据库设计:
Java代码
- create table jackdemo1
- (
- id int primary key auto_increment,
- name varchar(50),
- age int,
- address varchar(200)
- );
create table jackdemo1 ( id int primary key auto_increment, name varchar(50), age int, address varchar(200) );
使用 Dwr,首先要配置Web.xml文件:
Java代码
- <?xml version="1.0" encoding="UTF-8"?>
- <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
- xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
- xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
- http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
- <servlet>
- <servlet-name>dwr-invoker</servlet-name>
- <servlet-class>
- org.directwebremoting.servlet.DwrServlet
- </servlet-class>
- </servlet>
- <servlet-mapping>
- <servlet-name>dwr-invoker</servlet-name>
- <url-pattern>/dwr/*</url-pattern>
- </servlet-mapping>
- </web-app>
<?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <servlet> <servlet-name>dwr-invoker</servlet-name> <servlet-class> org.directwebremoting.servlet.DwrServlet </servlet-class> </servlet> <servlet-mapping> <servlet-name>dwr-invoker</servlet-name> <url-pattern>/dwr/*</url-pattern> </servlet-mapping> </web-app>
然后要在web.xml文件同一级目录下建立一个 dwr.xml文件,具体的配置如下:
Java代码
- <!DOCTYPE dwr PUBLIC
- "-//GetAhead Limited//DTD Direct Web Remoting 2.0//EN"
- "http://getahead.org/dwr/dwr20.dtd">
- <dwr>
- <allow>
- <create javascript="People" creator="new">
- <param name="class" value="com.jack.dwr.simple.People"></param>
- </create>
- <convert match="com.jack.dwr.simple.Person" converter="bean" javascript="Person"></convert>
- </allow>
- </dwr>
<!DOCTYPE dwr PUBLIC "-//GetAhead Limited//DTD Direct Web Remoting 2.0//EN" "http://getahead.org/dwr/dwr20.dtd"> <dwr> <allow> <create javascript="People" creator="new"> <param name="class" value="com.jack.dwr.simple.People"></param> </create> <convert match="com.jack.dwr.simple.Person" converter="bean" javascript="Person"></convert> </allow> </dwr>
其实Javascript="People"是要在客户端使用的对象名称,<param>是对象的Java类名,因为People类中对应的方法中使用了Person类,所在在这里要使用<convert>进行转换。
Person类是一个POJO类:
Java代码
- package com.jack.dwr.simple;
- public class Person {
- private int id;
- private String name;
- private int age;
- private String address;
- public int getId() {
- return id;
- }
- public void setId(int id) {
- this.id = id;
- }
- public String getName() {
- return name;
- }
- public void setName(String name) {
- this.name = name;
- }
- public int getAge() {
- return age;
- }
- public void setAge(int age) {
- this.age = age;
- }
- public String getAddress() {
- return address;
- }
- public void setAddress(String address) {
- this.address = address;
- }
- }
package com.jack.dwr.simple; public class Person { private int id; private String name; private int age; private String address; public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } public String getAddress() { return address; } public void setAddress(String address) { this.address = address; } }
上面的各个属性对应数据库中的字段信息。
People类是对数据进行操作类也是就是具体的业务类:
Java代码
- package com.jack.dwr.simple;
- import java.sql.Connection;
- import java.sql.PreparedStatement;
- import java.sql.ResultSet;
- import java.sql.SQLException;
- import java.sql.Statement;
- import java.util.ArrayList;
- import java.util.List;
- /**
- * A container for a set of people
- *
- * @author jackzhangyunjie
- */
- public class People {
- private Connection conn;
- /**
- * 构造函数,同时初始化建立与数据库的连接
- */
- public People() {
- try {
- conn = DBConnection.getConnectionMySqlDB("3306", "jackdemo",
- "root", "jack");
- } catch (Exception e) {
- e.printStackTrace();
- }
- }
- /**
- * 删除一个用户
- *
- * @param person
- * 要删除的用户
- *
- */
- public void deletePerson(Person person) throws Exception {
- String sql = "delete from jackdemo1 where id=?";
- PreparedStatement pstmt = conn.prepareStatement(sql);
- pstmt.setInt(1, person.getId());
- //更新数据库操作
- pstmt.executeUpdate();
- //关闭预编译和数据库连接
- pstmt.close();
- conn.close();
- }
- /**
- * 更新用户信息
- * @param person 要进行更新的用户对象
- * @throws Exception
- */
- public void updatePerson(Person person) throws Exception {
- String sql = "update jackdemo1 set name=?,age=?,address=? where id=?";
- PreparedStatement pstmt = conn.prepareStatement(sql);
- pstmt.setString(1, person.getName());
- pstmt.setInt(2, person.getAge());
- pstmt.setString(3, person.getAddress());
- pstmt.setInt(4, person.getId());
- //更新数据库操作
- pstmt.executeUpdate();
- //关闭预编译和数据库连接
- pstmt.close();
- conn.close();
- }
- /**
- * 得到全部的人员信息
- *
- * @return 返回一个包含人员的List
- * @throws SQLException
- */
- @SuppressWarnings("unchecked")
- public List getAllPerson() throws SQLException {
- List list = new ArrayList();
- String sql = "select * from jackdemo1";
- Statement st = conn.createStatement();
- //查询数据库,得到所有人员信息
- ResultSet rs = st.executeQuery(sql);
- while (rs.next()) {
- Person person = new Person();
- person.setId(rs.getInt("id"));
- person.setName(rs.getString("name"));
- person.setAge(rs.getInt("age"));
- person.setAddress(rs.getString("address"));
- list.add(person);
- }
- return list;
- }
- /**
- * 添加人员
- *
- * @param person
- * 要添加的人员的信息
- */
- public void addPerson(Person person) throws Exception {
- String sql = "insert into jackdemo1(name,age,address) values(?,?,?)";
- PreparedStatement pstmt = conn.prepareStatement(sql);
- //设置人员信息
- pstmt.setString(1, person.getName());
- pstmt.setInt(2, person.getAge());
- pstmt.setString(3, person.getAddress());
- //更新数据库操作
- pstmt.executeUpdate();
- //关闭预编译和数据库连接
- pstmt.close();
- conn.close();
- }
- }
package com.jack.dwr.simple; import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; import java.util.ArrayList; import java.util.List; /** * A container for a set of people * * @author jackzhangyunjie */ public class People { private Connection conn; /** * 构造函数,同时初始化建立与数据库的连接 */ public People() { try { conn = DBConnection.getConnectionMySqlDB("3306", "jackdemo", "root", "jack"); } catch (Exception e) { e.printStackTrace(); } } /** * 删除一个用户 * * @param person * 要删除的用户 * */ public void deletePerson(Person person) throws Exception { String sql = "delete from jackdemo1 where id=?"; PreparedStatement pstmt = conn.prepareStatement(sql); pstmt.setInt(1, person.getId()); //更新数据库操作 pstmt.executeUpdate(); //关闭预编译和数据库连接 pstmt.close(); conn.close(); } /** * 更新用户信息 * @param person 要进行更新的用户对象 * @throws Exception */ public void updatePerson(Person person) throws Exception { String sql = "update jackdemo1 set name=?,age=?,address=? where id=?"; PreparedStatement pstmt = conn.prepareStatement(sql); pstmt.setString(1, person.getName()); pstmt.setInt(2, person.getAge()); pstmt.setString(3, person.getAddress()); pstmt.setInt(4, person.getId()); //更新数据库操作 pstmt.executeUpdate(); //关闭预编译和数据库连接 pstmt.close(); conn.close(); } /** * 得到全部的人员信息 * * @return 返回一个包含人员的List * @throws SQLException */ @SuppressWarnings("unchecked") public List getAllPerson() throws SQLException { List list = new ArrayList(); String sql = "select * from jackdemo1"; Statement st = conn.createStatement(); //查询数据库,得到所有人员信息 ResultSet rs = st.executeQuery(sql); while (rs.next()) { Person person = new Person(); person.setId(rs.getInt("id")); person.setName(rs.getString("name")); person.setAge(rs.getInt("age")); person.setAddress(rs.getString("address")); list.add(person); } return list; } /** * 添加人员 * * @param person * 要添加的人员的信息 */ public void addPerson(Person person) throws Exception { String sql = "insert into jackdemo1(name,age,address) values(?,?,?)"; PreparedStatement pstmt = conn.prepareStatement(sql); //设置人员信息 pstmt.setString(1, person.getName()); pstmt.setInt(2, person.getAge()); pstmt.setString(3, person.getAddress()); //更新数据库操作 pstmt.executeUpdate(); //关闭预编译和数据库连接 pstmt.close(); conn.close(); } }
以上就是具体的业务操作信息,其中
DBConnection.getConnectionMySqlDB("3306", "jackdemo","root", "jack")方法用于建立与数据库的连接。
DBConnection是一个数据库连接类:
Java代码
- package com.jack.dwr.simple;
- import java.sql.Connection;
- import java.sql.DriverManager;
- public class DBConnection {
- public static Connection getConnectionMySqlDB(String post, String dbName,String userName,String password)
- throws Exception {
- String driver = "com.mysql.jdbc.Driver";
- String url = "jdbc:mysql://localhost:" + post + "/" + dbName;
- String user = userName;
- String pwd = password;
- Class.forName(driver);
- return DriverManager.getConnection(url, user, pwd);
- }
- }
package com.jack.dwr.simple; import java.sql.Connection; import java.sql.DriverManager; public class DBConnection { public static Connection getConnectionMySqlDB(String post, String dbName,String userName,String password) throws Exception { String driver = "com.mysql.jdbc.Driver"; String url = "jdbc:mysql://localhost:" + post + "/" + dbName; String user = userName; String pwd = password; Class.forName(driver); return DriverManager.getConnection(url, user, pwd); } }
当然你也可以自己扩展别的数据库连接方法。
具体的JSP页面:
Java代码
- <%@ page language="java" pageEncoding="GBK"%>
- <%
- String path = request.getContextPath();
- %>
- <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
- <html>
- <head>
- <title>EditTable的完整扩展</title>
- <script type="text/javascript" src="<%=path%>/dwr/util.js"></script>
- <script type="text/javascript" src="<%=path%>/dwr/engine.js"></script>
- <script type="text/javascript"
- src="<%=path%>/dwr/interface/People.js"></script>
- <script type="text/javascript" src="people.js"></script>
- </head>
- <body onload="init();">
- <div id="tabContents">
- <div id="demoDiv">
- <h3>
- All People
- </h3>
- <table border="1">
- <thead>
- <tr>
- <th>
- IDCode
- </th>
- <th>
- Person
- </th>
- <th>
- AGE
- </th>
- <th>
- ADDRESS
- </th>
- <th>
- Actions
- </th>
- </tr>
- </thead>
- <tbody id="peoplebody">
- <tr id="pattern" style="display: none;">
- <td>
- <span id="tableId">Id</span>
- </td>
- <td>
- <span id="tableName">Name</span>
- </td>
- <td>
- <span id="tableAge">Age</span>
- </td>
- <td>
- <span id="tableAddress">Address</span>
- </td>
- <td>
- <input id="edit" type="button" value="Edit" onclick="editClicked(this.id)" />
- <input id="delete" type="button" value="Delete" onclick="deleteClicked(this.id)" />
- </td>
- </tr>
- </tbody>
- </table>
- <h3>
- <input id="add" type="button" value="添加人员" onclick="addPerson();" />
- </h3>
- <div id="operation" style="display:none;">
- <h3>
- <span id="operationType"></span>
- </h3>
- <table class="plain">
- <tr>
- <td>
- Name:
- </td>
- <td>
- <input id="name" type="text" size="30" />
- </td>
- </tr>
- <tr>
- <td>
- Age:
- </td>
- <td>
- <input id="age" type="text" size="20" />
- </td>
- </tr>
- <tr>
- <td>
- Address:
- </td>
- <td>
- <input type="text" id="address" size="40" />
- </td>
- </tr>
- <tr>
- <td colspan="2" align="right">
- <small>(ID=<span id="id">-1</span>)</small>
- <input type="button" value="Save" onclick="writePerson()" />
- <input type="button" value="Clear" onclick="clearPerson()" />
- </td>
- </tr>
- </table>
- </div>
- </div>
- </body>
- </html>
<%@ page language="java" pageEncoding="GBK"%> <% String path = request.getContextPath(); %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>EditTable的完整扩展</title> <script type="text/javascript" src="<%=path%>/dwr/util.js"></script> <script type="text/javascript" src="<%=path%>/dwr/engine.js"></script> <script type="text/javascript" src="<%=path%>/dwr/interface/People.js"></script> <script type="text/javascript" src="people.js"></script> </head> <body onload="init();"> <div id="tabContents"> <div id="demoDiv"> <h3> All People </h3> <table border="1"> <thead> <tr> <th> IDCode </th> <th> Person </th> <th> AGE </th> <th> ADDRESS </th> <th> Actions </th> </tr> </thead> <tbody id="peoplebody"> <tr id="pattern" style="display: none;"> <td> <span id="tableId">Id</span> </td> <td> <span id="tableName">Name</span> </td> <td> <span id="tableAge">Age</span> </td> <td> <span id="tableAddress">Address</span> </td> <td> <input id="edit" type="button" value="Edit" onclick="editClicked(this.id)" /> <input id="delete" type="button" value="Delete" onclick="deleteClicked(this.id)" /> </td> </tr> </tbody> </table> <h3> <input id="add" type="button" value="添加人员" onclick="addPerson();" /> </h3> <div id="operation" style="display:none;"> <h3> <span id="operationType"></span> </h3> <table class="plain"> <tr> <td> Name: </td> <td> <input id="name" type="text" size="30" /> </td> </tr> <tr> <td> Age: </td> <td> <input id="age" type="text" size="20" /> </td> </tr> <tr> <td> Address: </td> <td> <input type="text" id="address" size="40" /> </td> </tr> <tr> <td colspan="2" align="right"> <small>(ID=<span id="id">-1</span>)</small> <input type="button" value="Save" onclick="writePerson()" /> <input type="button" value="Clear" onclick="clearPerson()" /> </td> </tr> </table> </div> </div> </body> </html>
上面是具体的页面信息,people.js信息如下:
Java代码
- var peopleCache = {};
- var viewed = -1;
- var type;
- function init() {
- fillTable();
- }
- function fillTable() {
- People.getAllPerson(function (people) {
- // Delete all the rows except for the "pattern" row
- dwr.util.removeAllRows("peoplebody", {filter:function (tr) {
- return (tr.id != "pattern");
- }});
- // Create a new set cloned from the pattern row
- var person, id;
- people.sort(function (p1, p2) {
- return p1.name.localeCompare(p2.name);
- });
- for (var i = 0; i < people.length; i++) {
- person = people[i];
- id = person.id;
- dwr.util.cloneNode("pattern", {idSuffix:id});
- dwr.util.setValue("tableId" + id, person.id);
- dwr.util.setValue("tableName" + id, person.name);
- dwr.util.setValue("tableAge" + id, person.age);
- dwr.util.setValue("tableAddress" + id, person.address);
- $("pattern" + id).style.display = ""; // officially we should use table-row, but IE prefers "" for some reason
- peopleCache[id] = person;
- }
- });
- }
- function editClicked(eleid) {
- alert(eleid);
- document.getElementById("operation").style.display = "block";
- document.getElementById("operationType").innerHTML = "\u7f16\u8f91\u6570\u636e";
- var person = peopleCache[eleid.substring(4)];
- dwr.util.setValues(person);
- type = "edit";
- }
- function addPerson() {
- document.getElementById("operation").style.display = "block";
- document.getElementById("operationType").innerHTML = "\u6dfb\u52a0\u6570\u636e";
- dwr.util.setValue("name", "");
- dwr.util.setValue("age", "");
- dwr.util.setValue("address", "");
- dwr.util.setValue("id", "?");
- type = "add";
- }
- //insert or update Person into database
- function writePerson() {
- var person;
- if (type == "add") {
- person = {name:null, age:null, address:null};
- dwr.util.getValues(person);
- dwr.engine.beginBatch();
- People.addPerson(person);
- }else if(type=="edit"){
- person = {id:null,name:null,age:null,address:null};
- dwr.util.getValues(person);
- dwr.engine.beginBatch();
- People.updatePerson(person);
- }
- fillTable();
- dwr.engine.endBatch();
- document.getElementById("operation").style.display = "none";
- dwr.util.setValue("name", "");
- dwr.util.setValue("age", "");
- dwr.util.setValue("address", "");
- dwr.util.setValue("id", "?");
- }
- //delete person from database
- function deleteClicked(eleid) {
- var person = peopleCache[eleid.substring(6)];
- dwr.engine.beginBatch();
- People.deletePerson(person);
- fillTable();
- dwr.engine.endBatch();
- }
var peopleCache = {}; var viewed = -1; var type; function init() { fillTable(); } function fillTable() { People.getAllPerson(function (people) { // Delete all the rows except for the "pattern" row dwr.util.removeAllRows("peoplebody", {filter:function (tr) { return (tr.id != "pattern"); }}); // Create a new set cloned from the pattern row var person, id; people.sort(function (p1, p2) { return p1.name.localeCompare(p2.name); }); for (var i = 0; i < people.length; i++) { person = people[i]; id = person.id; dwr.util.cloneNode("pattern", {idSuffix:id}); dwr.util.setValue("tableId" + id, person.id); dwr.util.setValue("tableName" + id, person.name); dwr.util.setValue("tableAge" + id, person.age); dwr.util.setValue("tableAddress" + id, person.address); $("pattern" + id).style.display = ""; // officially we should use table-row, but IE prefers "" for some reason peopleCache[id] = person; } }); } function editClicked(eleid) { alert(eleid); document.getElementById("operation").style.display = "block"; document.getElementById("operationType").innerHTML = "\u7f16\u8f91\u6570\u636e"; var person = peopleCache[eleid.substring(4)]; dwr.util.setValues(person); type = "edit"; } function addPerson() { document.getElementById("operation").style.display = "block"; document.getElementById("operationType").innerHTML = "\u6dfb\u52a0\u6570\u636e"; dwr.util.setValue("name", ""); dwr.util.setValue("age", ""); dwr.util.setValue("address", ""); dwr.util.setValue("id", "?"); type = "add"; } //insert or update Person into database function writePerson() { var person; if (type == "add") { person = {name:null, age:null, address:null}; dwr.util.getValues(person); dwr.engine.beginBatch(); People.addPerson(person); }else if(type=="edit"){ person = {id:null,name:null,age:null,address:null}; dwr.util.getValues(person); dwr.engine.beginBatch(); People.updatePerson(person); } fillTable(); dwr.engine.endBatch(); document.getElementById("operation").style.display = "none"; dwr.util.setValue("name", ""); dwr.util.setValue("age", ""); dwr.util.setValue("address", ""); dwr.util.setValue("id", "?"); } //delete person from database function deleteClicked(eleid) { var person = peopleCache[eleid.substring(6)]; dwr.engine.beginBatch(); People.deletePerson(person); fillTable(); dwr.engine.endBatch(); }
以上就是全部的扩展内容。也可以通过附件下载运行看看效果。
文章来源: http://wxq594808632.blog.163.com/blog/static/10907975520092191026285