spring ext 跨域

read方法中调用的response对象是父类BaseController的一个成员变量.

spring默认bean的生命周期Score为singleton单例模式.

当多线程并发使用同一bean, 并使用bean中的同一成员变量时会有问题. 比如下例中的成员变量response

以下是服务端跨域代码.

@Controller
@Scope("request")
@RequestMapping("/CrossDomain")
public class CrossDomainController extends BaseController {


    @RequestMapping("/read")
    @ControllerLog(description = "跨域请求")
    public void read(@RequestParam Map<String, Object> params) throws IOException {
        String url = (String) params.get("url");
        if(BlankUtil.isNotEmpty(url)) {
            HttpClient httpClient = HttpClientBuilder.create().build();
            HttpPost httpPost = new HttpPost(url);
            // 设置请求的header
            httpPost.addHeader("Content-Type", "application/x-www-form-urlencoded;charset=utf-8");
            // 设置请求的参数
            List<NameValuePair> nvps = new ArrayList<NameValuePair>();
            for (String key : params.keySet()) {
                nvps.add(new BasicNameValuePair(key, String.valueOf(params.get(key))));
            }
            httpPost.setEntity(new UrlEncodedFormEntity(nvps, "utf-8"));
            // 执行请求
            HttpResponse httpResponse = httpClient.execute(httpPost);
            String result = EntityUtils.toString(httpResponse.getEntity(), "utf-8");
            if("xml".equalsIgnoreCase(String.valueOf(params.get("type")))) {
                response.setContentType("text/xml; charset=UTF-8");
            }
            try {
                System.err.println("---------->" + String.valueOf(params.get("type")) + result.length());
                PrintWriter out = response.getWriter();
                out.write(result);
                out.flush();
                out.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

}

 修改Bean的生命周期scope配置为request或prototype即可.

JS代码（请求Java后台得到远程服务器xml文本内容,  然后在js端转换成xmldoc对象）

function crossDomainloadXmlFile(config) {
    var doc = null;
    Ext.Ajax.request({
        url : config.url, // 请求地址
        params : config.params, // 请求参数
        timeout: config.timeout || 30000,
        async : false,//同步请求
        method : 'post', // 方法
        callback : function(options, success, response) {
            if(!success) {
                if(top.checkTimeoutAndRelogin(response.status)) {
                    top.Ext.MessageBox.alert('错误提示', response.message);
                }
                return;
            }
            console.log('crossDomainloadXmlFile:' + response.responseText)
            doc = parseXmlString(response.responseText);
        }
    });
    return doc;
}

function parseXmlString(xmlString) {
    var doc;
    if (window.ActiveXObject) {
        doc = new ActiveXObject("Microsoft.XMLDOM");
        doc.setProperty("SelectionLanguage", "XPath");
        doc.async = false;
        doc.loadXML(xmlString);
    }
    // load XML string code for Mozilla, Firefox, Opera, etc.
    else {
        var parser = new DOMParser();
        doc = parser.parseFromString(xmlString, "text/xml");
    }

    return doc.documentElement;
}

EXT组件：

/**
 * Created by huangbaidong on 2016/6/30.
 * 简单数据字典通用Store,
 * 外部调用传入参数dictionaryId作为过滤条件.
 * 使用案例：
    store: Ext.create('app.component.sys.dictionary.SimpleDictionaryXmlStore', {
                dictionaryId : 1
            })
 */
Ext.define('app.component.sys.dictionary.SimpleDictionaryXmlStore', {
    extend: 'Ext.data.XmlStore',
    storeId :'simpleDictionaryStore',
    dictionaryId : 0,
    constructor : function(config) {
        var me = this;
        Ext.apply(config, {
            fields: [{
                name: 'id',
                mapping: '@id'
            }, {
                name: 'name',
                mapping: '@name'
            }, {
                name: 'dictionaryId',
                mapping: '@dictionaryId'
            }],
            data:(function(){
                var array = [];
                Ext.each(top.simpleDictionaryStore.getData().items, function(item) {
                    if(item.data.dictionaryId == config.dictionaryId) {
                        array.push(item);
                    }
                })
                return array;
            })()
        });
        app.component.sys.dictionary.SimpleDictionaryXmlStore.superclass.constructor.call(this, config);
    }
});

/**
     * 跨域获取数据字典, 并缓存为全局单例Store
     * @type {Ext.data.Store}
     */
    top.simpleDictionaryStore = Ext.create('Ext.data.Store', {
        autoLoad : true,
        fields: [{
            name: 'id',
            mapping: '@id'
        }, {
            name: 'name',
            mapping: '@name'
        }, {
            name: 'dictionaryId',
            mapping: '@dictionaryId'
        }],
        proxy: {
            type: 'ajax',
            url: '../CrossDomain/read',
            reader: {
                type: 'xml',
                record: 'simpleDictionary',
                idProperty: '@id',
                totalRecords: '@total'
            },
            extraParams:{//服务端跨域处理
                url: DICTIONARY_URL,
                type : 'xml'
            }
        }
    });