struts2向浏览器响应json数据的两种方式

js部分调用方式是一样的：
JS代码：
function testAjax() {
var $userNameInput = $("#ajax_username");
var userName = $userNameInput.val();
$.ajax({
url : "originAjax.action",
type : "GET",
data : "ajaxField=" + userName,
success : function(data, textStatus) {
alert(data);
}
});
}

private String username;
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public void checkUserName() throws IOException {
HttpServletResponse response = ServletActionContext.getResponse();
PrintWriter writer = response.getWriter();
writer.print("hello " + username);
writer.flush();
writer.close();
}

<action name="originAjax" class="TestAction" method="checkUserName" />

1.引入struts2-json-plugin-2.5.2.jar 

2.Action中添加类似的如下代码：

private String result;
public String getResult() {
return result;
}
public void setResult(String result) {
this.result = result;
}
/**
*
* AJAX for check MerchantAccount start
*
* */
private String merchantAccount;
public String getMerchantAccount() {
return merchantAccount;
}
public void setMerchantAccount(String merchantAccount) {
this.merchantAccount = merchantAccount;
}
// AJAX for check Merchant
public String checkMerchantAccountMethod() throws IOException {
AppResultJsonBean ajaxResultJsonBean = new AppResultJsonBean();
if (StarCloudStringUtils.isEmpty(merchantAccount)) {
ajaxResultJsonBean.setIsOK(false);
ajaxResultJsonBean.setData(null);
ajaxResultJsonBean.setResultCode(-1);
ajaxResultJsonBean.setResultMessage("商家账号不能为空");
ajaxResultJsonBean.setOther(null);
JSONObject ajaxResultJsonData = JSONObject
.fromObject(ajaxResultJsonBean);
this.result = ajaxResultJsonData.toString();
return SUCCESS;
}
if (!StarCloudStringUtils.isMobile(merchantAccount)) {
ajaxResultJsonBean.setIsOK(false);
ajaxResultJsonBean.setData(null);
ajaxResultJsonBean.setResultCode(-2);
ajaxResultJsonBean.setResultMessage("商家账号格式不合法");
ajaxResultJsonBean.setOther(null);
JSONObject ajaxResultJsonData = JSONObject.fromObject(ajaxResultJsonBean);
this.result = ajaxResultJsonData.toString();
return SUCCESS;
}
。。。
MerchantBean checkMerchantBean = merchantIService.findMerchantByAccount(merchantAccount);
if (checkMerchantBean != null) {
ajaxResultJsonBean.setIsOK(true);
ajaxResultJsonBean.setData(null);
ajaxResultJsonBean.setResultCode(0);
ajaxResultJsonBean.setResultMessage("商家账号可用");
ajaxResultJsonBean.setOther(null);
JSONObject ajaxResultJsonData = JSONObject.fromObject(ajaxResultJsonBean);
this.result = ajaxResultJsonData.toString();
return SUCCESS;
} else {
ajaxResultJsonBean.setIsOK(false);
ajaxResultJsonBean.setData(null);
ajaxResultJsonBean.setResultCode(-3);
ajaxResultJsonBean.setResultMessage("商家账号不存在");
ajaxResultJsonBean.setOther(null);
JSONObject ajaxResultJsonData = JSONObject.fromObject(ajaxResultJsonBean);
this.result = ajaxResultJsonData.toString();
return SUCCESS;
}
}
/**
*
* AJAX for check MerchantAccount start end
*
* */

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.5//EN"
"http://struts.apache.org/dtds/struts-2.5.dtd">
<struts>
<!-- AJAX
1.引入Jar包
2.所在包必须要继承自JSON-default
3.resultType是JSON
4.附加了一个参数excludeNullProperties，目的是不序列化Action里为null的字段。
5.<result>元素没有name属性，也没有跳转值
-->
<package name="struts_web_product_ajax" extends="json-default">
<!-- 新增商品信息检查账号 -->
<action name="checkMerchantAccountAction" class="controllers.actions.web.product.PrepareAddProductAction" method="checkMerchantAccountMethod">
<result type="json">
<param name="excludeNullProperties">true</param>
<param name="root">result</param>
</result>
</action>
</package>
</struts>

返回JSON格式：

js接受数据

function checkMerchantAccountAjax() {
var $merchantAccount = $("#merchantAccount");
var merchantAccount = $merchantAccount.val();
$.ajax({
url : "checkMerchantAccountAction",
type : "GET",
data : "merchantAccount=" + merchantAccount,
success : function(data, textStatus) {
var resultJSONData = JSON.parse(data);//注意这里必须有，因为之前返回的是result="json字符串"，但并类型不是JSON
if(resultJSONData.isOK){
$merchantAccount.css("color", "black");
return true;
}else{
$merchantAccount.css("color", "red");
layer.tips(resultJSONData.resultMessage,$merchantAccount, {
tips : [3, '#3595CC'],
time : 4000
});//end tips
return false;
}//end else
}//end success
});//end ajax
}// end js

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