Struts2对ajax的支持

使用stream类型的result实现ajax

package com.lee.action;

import java.io.ByteArrayInputStream;
import java.io.InputStream;

import com.opensymphony.xwork2.ActionSupport;

public class AJAXLoginAction extends ActionSupport {

    private static final long serialVersionUID = 1L;

    private String username;

    private String password;

    private InputStream inputStream;

    public String execute() throws Exception {

        inputStream = "lizhe".equals(username) && "lz123456".equals(password) ? new ByteArrayInputStream(
            "成功 success!".getBytes("GBK")) : new ByteArrayInputStream("失败 fail!".getBytes("GBK"));
            
            System.out.println(inputStream);

        return SUCCESS;
    }

    /**
     * @return the username
     */
    public String getUsername() {
        return username;
    }

    /**
     * @param username the username to set
     */
    public void setUsername(String username) {
        this.username = username;
    }

    /**
     * @return the password
     */
    public String getPassword() {
        return password;
    }

    /**
     * @param password the password to set
     */
    public void setPassword(String password) {
        this.password = password;
    }

    /**
     * @return the inputStream
     */
    public InputStream getInputStream() {
        return inputStream;
    }

    /**
     * @param inputStream the inputStream to set
     */
    public void setInputStream(InputStream inputStream) {
        this.inputStream = inputStream;
    }

}
<%@ page language="java" contentType="text/html; charset=GBK" pageEncoding="GBK"%>
<%@ taglib uri="/struts-tags" prefix="s"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GBK">
<script src="${pageContext.request.contextPath }/jquery/jquery-1.6.4.min.js" type="text/javascript"></script>
<title><s:text name="loginPage"></s:text></title>
</head>
<body>
    <form action="loginPro" id="loginForm">
        <s:textfield name="username" label="用户名" />
        <s:password name="password" label="密码" />
        <input id="loginBtn" type="button" value="提交" />
    </form>
    <div id="showMsg" style="display: none;"></div>
    <script type="text/javascript">
        $("#loginBtn").click(
                function() {
                    $
                            .get("loginPro", $("#loginForm").serializeArray(),
                                    function(data, statusText) {
                                        $("#showMsg").text("");
                                        $("#showMsg").append(
                                                "登陆结果： " + data + "<br/>");
                                        $("#showMsg").show(2000);
                                    }, "html");
                });
    </script>

</body>
</html>
        <action name="loginPro" class="com.lee.action.AJAXLoginAction">
            <result name="success" type="stream">
                <param name="contentType">text/html</param>
                <param name="inputName">inputStream</param>
            </result>
            
            <result name="input">/WEB-INF/content/ajaxLogin.jsp</result>
        </action>

 Struts2+JSON

jar包：struts2-json-plugin-2.1.8.1.jar

<%@ page language="java" contentType="text/html; charset=GBK" pageEncoding="GBK"%>
<%@ taglib uri="/struts-tags" prefix="s"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GBK">
<title><s:text name="showNamePage"></s:text></title>
<script src="${pageContext.request.contextPath }/jquery/jquery-1.6.4.min.js" type="text/javascript"></script>
<script type="text/javascript">
    function toSubmit() {
        var url = 'showName.action';
        var data = $("form").serialize();

        $.ajax({
            url : url,
            dataType : 'html',
            data : data,
            onComplete : processResponse,
            asynchronous : true
        });
    }

    function processResponse(request) {
        var evs = request.responseText.evalJSON();

        for ( var propName in evs) {
            $("show").innerHTML += propName + "-->" + evs[propName] + "<br/>";
        }
    }
</script>
</head>
<body>
    <s:form method="post">
        <s:textfield name="username" key="username" />
        <s:textfield name="age" key="age" />
        <s:textfield name="sex" key="sex" />
    </s:form>
    <input type="button" id="" value="提交" onclick="toSubmit();" />
    <div id="show"></div>
</body>
</html>
package com.lee.action;

import java.util.HashMap;
import java.util.Map;

import org.apache.struts2.json.annotations.JSON;

import com.opensymphony.xwork2.ActionSupport;

public class ShowNameAction extends ActionSupport {

    private static final long serialVersionUID = 1L;

    private String username;

    private String age;

    private String sex;

    private Map<String, String> map = new HashMap<String, String>();

    public String execute() {

        map.put("username", username);
        map.put("age", age);
        map.put("sex", sex);
        
        return SUCCESS;
    }

    @JSON(name = "newName")
    public Map<String, String> getMap() {
        return this.map;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getAge() {
        return age;
    }

    public void setAge(String age) {
        this.age = age;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }
}
    <package name="example" extends="json-default">
        <action name="showName" class="com.lee.action.ShowNameAction">
            <result type="json">
                <param name="noCacha">true</param>
                <param name="contentType">text/html</param>
            </result>
        </action>
        <action name="*">
            <result>/WEB-INF/content/{1}.jsp</result>
        </action>
    </package>
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原文地址：https://www.cnblogs.com/harryV/p/3706084.html