jQuery的Ajax实现异步传输List、Map
由于项目需要通过ajax得到后台的List对象里面的值，由于没有接触过json所以前期我只能先传字符串再在js里截取子串实现。闲暇时间摸索了一下关于json接受List对象的方法，步骤如下：
1.首先下载json所以依赖的包， Json-lib 最新版 json-lib-2.3-jdk15.jar，其官方网站是：http://json-lib.sourceforge.net/可以直接 download，细心的你会发现其网站页面里面有提示它还需要其他包：
Json-lib requires (at least) the following dependencies in your classpath:
jakarta commons-lang 2.4
jakarta commons-beanutils 1.7.0
jakarta commons-collections 3.2
jakarta commons-logging 1.1.1
ezmorph 1.0.6
其中一般项目中都会有前4个，所以只需要下载ezmorph 1.0.6 就可以了
下载地址分别是：
http://commons.apache.org/lang/
http://commons.apache.org/beanutils/
http://commons.apache.org/collections/
http://commons.apache.org/logging/
http://ezmorph.sourceforge.net/
2.首先先见一个小web项目
先建一个User类：
package com.json;
public class User {
String username;
String password;
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}
再建一个servlet
package com.json;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import net.sf.json.JSONArray;
public class TestJson extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request,response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
String str= request.getParameter("name");//得到ajax传递过来的paramater
System.out.print(str);
PrintWriter out = response.getWriter();
List list = new ArrayList();//传递List
Map m=new HashMap();//传递Map
User u1=new User();
u1.setUsername("zah");
u1.setPassword("123");
User u2=new User();
u2.setUsername("ztf");
u2.setPassword("456");
list.add(u1); //添加User对象
list.add(u2); //添加User对象
m.put("u1", u1);
m.put("u2", u2);
JSONArray jsonArray2 = JSONArray.fromObject( list );//转化成json对象
JSONObject jo=JSONObject.fromObject(m);//转化Map对象
out.print(jsonArray2);//返给ajax请求
out.print(jo);//返给ajax请求
}
}
配置好web.xml中的servlet映射，这一步就略了。
3.建立ajax实现
这里为了快速实现用的是jquery实现的。
<script type="text/javascript" src="js/jquery.js"></script>
<script type="text/javascript">
function test(){
$.ajax({
type:"POST", //请求方式
url:"testjson", //请求路径
cache: false,
data:"name=zah", //传参
dataType: 'json', //返回值类型
success:function(json){
alert(json[0].username+" "+ json[0].password); //弹出返回过来的List对象
}
});
}
</script>
</head>
<body>
<input type="button" name="b" value="测试" onclick=test()>
</body>
测试开始，点击按钮弹出zah 123
json[0]就相当于u1对象 json[1]相当于u2对象，对于其属性的访问跟java对象一样，其他的Connection测试应该一样,访问Map的话直接把返回函数改成如下即可：
success:function(json){
alert(json.u1.username)
}
}直接跟上Key.属性即可访问Object对象。
文章出处：飞诺网(www.firnow.com):http://dev.firnow.com/course/4_webprogram/ajax/ajaxxl/20100721/476877.html
CheckServlet.java源代码如下：
view plaincopy to clipboardprint?
01.package ajax.servlet;
02.import java.io.IOException;
03.import java.io.PrintWriter;
04.import javax.servlet.ServletException;
05.import javax.servlet.http.HttpServlet;
06.import javax.servlet.http.HttpServletRequest;
07.import javax.servlet.http.HttpServletResponse;
08./**
09. *
10. * @author Thinkpad
11. *
12. */
13.public class CheckServlet extends HttpServlet {
14. public void doGet(HttpServletRequest request, HttpServletResponse response)
15. throws ServletException, IOException {
16. response.setContentType("text/html");
17. response.setCharacterEncoding("UTF-8");
18. PrintWriter out = response.getWriter();
19.
20. String name = request.getParameter("username");
21. out.print("我是服务器，收到客户端的数据:"+name);
22. out.flush();
23. out.close();
24. }
25. public void doPost(HttpServletRequest request, HttpServletResponse response)
26. throws ServletException, IOException {
27. this.doGet(request, response);
28. }
29.}
package ajax.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
*
* @author Thinkpad
*
*/
public class CheckServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
response.setCharacterEncoding("UTF-8");
PrintWriter out = response.getWriter();
String name = request.getParameter("username");
out.print("我是服务器，收到客户端的数据:"+name);
out.flush();
out.close();
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
this.doGet(request, response);
}
}
3、编写客户端html文件
新建ajax.html文件
ajax.html文件源码如下：
view plaincopy to clipboardprint?
01.<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
02.<html>
03. <head>
04. <title>ajax实现校验</title>
05. <mce:script type="text/javascript" src="jslib/jquery.js" mce_src="jslib/jquery.js"></mce:script>
06. <mce:script type="text/javascript" src="jslib/verify.js" mce_src="jslib/verify.js"></mce:script>
07. </head>
08.
09. <body>
10. <input type="text" id="username">
11. <input type="button" value="校验" onclick="verify()" >
12. <dir id="result"></dir>
13. </body>
14.</html>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>ajax实现校验</title>
<mce:script type="text/javascript" src="jslib/jquery.js" mce_src="jslib/jquery.js"></mce:script>
<mce:script type="text/javascript" src="jslib/verify.js" mce_src="jslib/verify.js"></mce:script>
</head>
<body>
<input type="text" id="username">
<input type="button" value="校验" onclick="verify()" >
<dir id="result"></dir>
</body>
</html>
4、下载jquery.js文件
下载地址：http://docs.jquery.com/Downloading_jQuery
下载后，将文件拷贝到文件结构中
5、编写verify.js文件
verify.js源代码如下：
view plaincopy to clipboardprint?
01.function verify() {
02. // 注解
03. // alert("点击了按钮");
04. // jquery查询节点的方法
05. var jqueryObj = $("#username");
06. // 获取文本框中用户输入的数据
07. var username = jqueryObj.val();
08. // alert(username);
09. // 将数据发送给服务器的servlet
10. $.get("servlet/CheckServlet?username=" + username, null, callback);
11.}
12.// 回调函数
13.function callback(data) {
14. // alert("收到服务器返回的数据");
15. // alert(data);
16. var resultObj = $("#result");
17. resultObj.html(data);
18.}
function verify() {
// 注解
// alert("点击了按钮");
// jquery查询节点的方法
var jqueryObj = $("#username");
// 获取文本框中用户输入的数据
var username = jqueryObj.val();
// alert(username);
// 将数据发送给服务器的servlet
$.get("servlet/CheckServlet?username=" + username, null, callback);
}
// 回调函数
function callback(data) {
// alert("收到服务器返回的数据");
// alert(data);
var resultObj = $("#result");
resultObj.html(data);
}
1.首先下载json所以依赖的包， Json-lib 最新版 json-lib-2.3-jdk15.jar，其官方网站是：http://json-lib.sourceforge.net/可以直接 download，细心的你会发现其网站页面里面有提示它还需要其他包：
Json-lib requires (at least) the following dependencies in your classpath:
jakarta commons-lang 2.4
jakarta commons-beanutils 1.7.0
jakarta commons-collections 3.2
jakarta commons-logging 1.1.1
ezmorph 1.0.6
其中一般项目中都会有前4个，所以只需要下载ezmorph 1.0.6 就可以了
下载地址分别是：
http://commons.apache.org/lang/
http://commons.apache.org/beanutils/
http://commons.apache.org/collections/
http://commons.apache.org/logging/
http://ezmorph.sourceforge.net/
2.首先先见一个小web项目
先建一个User类：
package com.json;
public class User {
String username;
String password;
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}
再建一个servlet
package com.json;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import net.sf.json.JSONArray;
public class TestJson extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request,response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
String str= request.getParameter("name");//得到ajax传递过来的paramater
System.out.print(str);
PrintWriter out = response.getWriter();
List list = new ArrayList();//传递List
Map m=new HashMap();//传递Map
User u1=new User();
u1.setUsername("zah");
u1.setPassword("123");
User u2=new User();
u2.setUsername("ztf");
u2.setPassword("456");
list.add(u1); //添加User对象
list.add(u2); //添加User对象
m.put("u1", u1);
m.put("u2", u2);
JSONArray jsonArray2 = JSONArray.fromObject( list );//转化成json对象
JSONObject jo=JSONObject.fromObject(m);//转化Map对象
out.print(jsonArray2);//返给ajax请求
out.print(jo);//返给ajax请求
}
}
配置好web.xml中的servlet映射，这一步就略了。
3.建立ajax实现
这里为了快速实现用的是jquery实现的。
<script type="text/javascript" src="js/jquery.js"></script>
<script type="text/javascript">
function test(){
$.ajax({
type:"POST", //请求方式
url:"testjson", //请求路径
cache: false,
data:"name=zah", //传参
dataType: 'json', //返回值类型
success:function(json){
alert(json[0].username+" "+ json[0].password); //弹出返回过来的List对象
}
});
}
</script>
</head>
<body>
<input type="button" name="b" value="测试" onclick=test()>
</body>
测试开始，点击按钮弹出zah 123
json[0]就相当于u1对象 json[1]相当于u2对象，对于其属性的访问跟java对象一样，其他的Connection测试应该一样,访问Map的话直接把返回函数改成如下即可：
success:function(json){
alert(json.u1.username)
}
}直接跟上Key.属性即可访问Object对象。
文章出处：飞诺网(www.firnow.com):http://dev.firnow.com/course/4_webprogram/ajax/ajaxxl/20100721/476877.html
CheckServlet.java源代码如下：
view plaincopy to clipboardprint?
01.package ajax.servlet;
02.import java.io.IOException;
03.import java.io.PrintWriter;
04.import javax.servlet.ServletException;
05.import javax.servlet.http.HttpServlet;
06.import javax.servlet.http.HttpServletRequest;
07.import javax.servlet.http.HttpServletResponse;
08./**
09. *
10. * @author Thinkpad
11. *
12. */
13.public class CheckServlet extends HttpServlet {
14. public void doGet(HttpServletRequest request, HttpServletResponse response)
15. throws ServletException, IOException {
16. response.setContentType("text/html");
17. response.setCharacterEncoding("UTF-8");
18. PrintWriter out = response.getWriter();
19.
20. String name = request.getParameter("username");
21. out.print("我是服务器，收到客户端的数据:"+name);
22. out.flush();
23. out.close();
24. }
25. public void doPost(HttpServletRequest request, HttpServletResponse response)
26. throws ServletException, IOException {
27. this.doGet(request, response);
28. }
29.}
package ajax.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
*
* @author Thinkpad
*
*/
public class CheckServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
response.setCharacterEncoding("UTF-8");
PrintWriter out = response.getWriter();
String name = request.getParameter("username");
out.print("我是服务器，收到客户端的数据:"+name);
out.flush();
out.close();
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
this.doGet(request, response);
}
}
3、编写客户端html文件
新建ajax.html文件
ajax.html文件源码如下：
view plaincopy to clipboardprint?
01.<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
02.<html>
03. <head>
04. <title>ajax实现校验</title>
05. <mce:script type="text/javascript" src="jslib/jquery.js" mce_src="jslib/jquery.js"></mce:script>
06. <mce:script type="text/javascript" src="jslib/verify.js" mce_src="jslib/verify.js"></mce:script>
07. </head>
08.
09. <body>
10. <input type="text" id="username">
11. <input type="button" value="校验" onclick="verify()" >
12. <dir id="result"></dir>
13. </body>
14.</html>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>ajax实现校验</title>
<mce:script type="text/javascript" src="jslib/jquery.js" mce_src="jslib/jquery.js"></mce:script>
<mce:script type="text/javascript" src="jslib/verify.js" mce_src="jslib/verify.js"></mce:script>
</head>
<body>
<input type="text" id="username">
<input type="button" value="校验" onclick="verify()" >
<dir id="result"></dir>
</body>
</html>
4、下载jquery.js文件
下载地址：http://docs.jquery.com/Downloading_jQuery
下载后，将文件拷贝到文件结构中
5、编写verify.js文件
verify.js源代码如下：
view plaincopy to clipboardprint?
01.function verify() {
02. // 注解
03. // alert("点击了按钮");
04. // jquery查询节点的方法
05. var jqueryObj = $("#username");
06. // 获取文本框中用户输入的数据
07. var username = jqueryObj.val();
08. // alert(username);
09. // 将数据发送给服务器的servlet
10. $.get("servlet/CheckServlet?username=" + username, null, callback);
11.}
12.// 回调函数
13.function callback(data) {
14. // alert("收到服务器返回的数据");
15. // alert(data);
16. var resultObj = $("#result");
17. resultObj.html(data);
18.}
function verify() {
// 注解
// alert("点击了按钮");
// jquery查询节点的方法
var jqueryObj = $("#username");
// 获取文本框中用户输入的数据
var username = jqueryObj.val();
// alert(username);
// 将数据发送给服务器的servlet
$.get("servlet/CheckServlet?username=" + username, null, callback);
}
// 回调函数
function callback(data) {
// alert("收到服务器返回的数据");
// alert(data);
var resultObj = $("#result");
resultObj.html(data);
}