Struct2_使用Ajax调用Action方法并返回值

时间：2022-05-09 04:25:52
一、Login.jsp
1、<head>引入jquery：
<script type="text/javascript"

src="http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.7.1.js"></script>

 
2、界面控件： 
用户名： <input type="text" id="userName"> 
<input type="button" id="btnAjax" value="Ajax调用" />  
 
3、提交ajax请求
<script type="text/javascript">
        $(function() {
            $("#btnAjax").click(function() {
                var userName = $("#userName").val().trim();
                if (userName == '') {
                    alert("用户名不能为空");
                    return false;
                }
                //login1为Action类命名空间名称；AjaxExecute为Action方法名称
                $.ajax({
                    type : "post",
                    url : '/login1/ajaxExecute',
                    data : {//设置数据源
                        userName : userName,
                        password : "我是密码"
                    },
                    dataType : "json",//设置需要返回的数据类型
                    success : function(d) {
                        alert(d.sayHi);
                    },
                    error : function(d) {
                        alert(d.responseText);
                    }
                });
            });
        });

</script>

 
二、后台类：LoginActionNoNamespce

package action;

import java.text.SimpleDateFormat;

import java.util.Date;

import java.util.HashMap;

import java.util.Map;

import org.apache.struts2.convention.annotation.Action;

import org.apache.struts2.convention.annotation.Namespace;

import org.apache.struts2.convention.annotation.ParentPackage;

import org.apache.struts2.convention.annotation.Result;

import org.apache.struts2.interceptor.validation.SkipValidation;

import freemarker.template.SimpleDate;

@ParentPackage("json-default")

@Namespace("/login1")

public class LoginActionNoNamespce extends SuperActionSupport {

private static final long serialVersionUID = 1L;

private Map<String, String> dataMap;

//会把本类所有getter方法序列化成字符串返回给jsp页面

public Map<String, String> getDataMap() {

return dataMap;

}

public void setDataMap(Map<String, String> dataMap) {

this.dataMap = dataMap;

}

@SkipValidation

@Action(value = "ajaxExecute", results = { @Result(type = "json", params = { "root", "dataMap" }) })

public String ajaxExecute() throws Exception {

this.dataMap = new HashMap<String, String>();

// 参数名称必须和jsp的空间名称一一对应

String userName = request.getParameter("userName");

String password = request.getParameter("password");

dataMap.put("isSuccess", "true");

SimpleDateFormat now = new SimpleDateFormat("yyyy年MM月dd日 HH时mm分ss秒");

dataMap.put("sayHi", "Hi:" + userName + "  当前时间为：" + now.format(new Date()) + password);

return SUCCESS;

}

}
 
三、注意事项
  1. 类注解：@ParentPackage("json-default")，比如为json-default，不能为struts-default
    json-default是继承于structs-default的,见.m2\repository\org\apache\struts\struts2-json-plugin\2.3.16.3\struts2-json-plugin-2.3.16.3.jar\struts-plugin.xml
  2. Action注解：@Action(value = "ajaxExecute", results = { @Result(type = "json", params = { "root", "dataMap" }) })，这里的type必须为json、root是固定值，去掉params节点会返回undefined
  3. 这里的dataMap定义为：private Map<String, String> dataMap;必须要添加getter、setter参数，否则返回null
  4. JSP页面（这里可以用命名空间，如
    url : '/login1/ajaxExecute', @ParentPackage("json-default")这样设置就不会报错）
  5. maven管理，需要引用的库
    <dependencies>
     
            <dependency>
                <groupId>org.apache.struts</groupId>
                <artifactId>struts2-core</artifactId>
                <version>2.3.16</version>
                <exclusions>
                    <exclusion>
                        <groupId>org.javassist</groupId>
                        <artifactId>javassist</artifactId>
                    </exclusion>
                </exclusions>
            </dependency>
            <dependency>
                <groupId>javax.servlet</groupId>
                <artifactId>javax.servlet-api</artifactId>
                <version>3.1.0</version>
            </dependency>
            <dependency>
                <groupId>org.apache.struts</groupId>
                <artifactId>struts2-convention-plugin</artifactId>
                <version>2.3.16.3</version>
            </dependency>
            <dependency>
                <groupId>org.apache.struts</groupId>
                <artifactId>struts2-json-plugin</artifactId>
                <version>2.3.16.3</version>
            </dependency>
            <dependency>
                <groupId>net.sf.json-lib</groupId>
                <artifactId>json-lib</artifactId>
                <version>2.4</version>
            </dependency>
     

    </dependencies>

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