Struts2+JQuery+JSON实现异步交互，包括从后台获得单个值、对象、List和Map数据并从前台的表达中获取值把值进行序列化通过JQuery的$.ajax({})传到后台和后台的对象进行绑定。

第一步：在MyEclipse中创建JavaWeb工厂并把Struts2?和 json的jar包添加到工程中添加完成后的工程图是：

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第二步：创建后台：

? 1. UserInfo实体类：

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Userinfo实体类代码

1. package?struts2jsonjquery.test.entity; ??
2. ??
3. import?java.io.Serializable; ??
4. /** ??
5. ?*?<p> ??
6. ?*??用户实体类 ??
7. ?*?</p> ??
8. ?*?@author?朱延伟 ??
9. ?* ??
10. ?*/ ??
11. public?class?UserInfo?implements?Serializable?{ ??
12. ??
13. ????private?static?final?long?serialVersionUID?=?3952189513312630860L; ??
14. ???? ??
15. ????private?int?userId; ??
16. ????private?String?userName; ??
17. ????private?String?password; ??
18. ????public?int?getUserId()?{ ??
19. ????????return?userId; ??
20. ????} ??
21. ????public?void?setUserId(int?userId)?{ ??
22. ????????this.userId?=?userId; ??
23. ????} ??
24. ????public?String?getUserName()?{ ??
25. ????????return?userName; ??
26. ????} ??
27. ????public?void?setUserName(String?userName)?{ ??
28. ????????this.userName?=?userName; ??
29. ????} ??
30. ????public?String?getPassword()?{ ??
31. ????????return?password; ??
32. ????} ??
33. ????public?void?setPassword(String?password)?{ ??
34. ????????this.password?=?password; ??
35. ????} ??
36. }??

package struts2jsonjquery.test.entity;

import java.io.Serializable;
/**
 * <p>
 * 	用户实体类
 * </p>
 * @author 朱延伟
 *
 */
public class UserInfo implements Serializable {

	private static final long serialVersionUID = 3952189513312630860L;
	
	private int userId;
	private String userName;
	private String password;
	public int getUserId() {
		return userId;
	}
	public void setUserId(int userId) {
		this.userId = userId;
	}
	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;
	}
}

?

2. Action类

Action类代码

1. package?struts2jsonjquery.test.action; ??
2. ??
3. import?java.util.ArrayList; ??
4. import?java.util.HashMap; ??
5. import?java.util.List; ??
6. import?java.util.Map; ??
7. ??
8. import?struts2jsonjquery.test.entity.UserInfo; ??
9. ??
10. import?com.opensymphony.xwork2.ActionSupport; ??
11. ??
12. public?class?JsonJqueryStruts2Action?extends?ActionSupport?{ ??
13. ??
14. ????private?static?final?long?serialVersionUID?=?3518833679938898354L; ??
15. ???? ??
16. ????private?String?message;???