net.ymate.platform.mvc.web.view.impl.JsonView.java Source code

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Here is the source code for net.ymate.platform.mvc.web.view.impl.JsonView.java

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/*
 * Copyright 2007-2107 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package net.ymate.platform.mvc.web.view.impl;

import javax.servlet.http.HttpServletResponse;

import net.ymate.platform.mvc.web.WebMVC;
import net.ymate.platform.mvc.web.context.WebContext;
import net.ymate.platform.mvc.web.view.AbstractWebView;

import org.apache.commons.io.IOUtils;
import org.apache.commons.lang.StringUtils;

import com.alibaba.fastjson.JSON;

/**
 * <p>
 * JsonView
 * </p>
 * <p>
 * JSON
 * </p>
 * 
 * @author (suninformation@163.com)
 * @version 0.0.0
 *          <table style="border:1px solid gray;">
 *          <tr>
 *          <th width="100px">?</th><th width="100px"></th><th
 *          width="100px"></th><th width="100px"></th>
 *          </tr>
 *          <!--  Table ?? -->
 *          <tr>
 *          <td>0.0.0</td>
 *          <td></td>
 *          <td></td>
 *          <td>2011-10-23?11:27:16</td>
 *          </tr>
 *          </table>
 */
public class JsonView extends AbstractWebView {

    public static final String JSON_CONTENT_TYPE = "application/json";
    public static final String JAVASCRIPT_CONTENT_TYPE = "text/javascript";

    protected Object jsonObj;
    protected boolean withContentType;
    protected String jsonpCallback;

    /**
     * 
     * @param obj Java
     */
    public JsonView(Object obj) {
        this.jsonObj = JSON.toJSON(obj);
    }

    /**
     * 
     * 
     * @param jsonStr JSON
     */
    public JsonView(String jsonStr) {
        this.jsonObj = JSON.parse(jsonStr);
    }

    /**
     * @return ContentType"application/json""text/javascript"
     */
    public JsonView withContentType() {
        this.withContentType = true;
        return this;
    }

    /**
     * @param callback ??
     * @return JSONP????callbackcallback???
     */
    public JsonView withJsonpCallback(String callback) {
        this.jsonpCallback = StringUtils.defaultIfEmpty(callback, null);
        return this;
    }

    /* (non-Javadoc)
     * @see net.ymate.platform.mvc.web.view.AbstractWebView#renderView()
     */
    protected void renderView() throws Exception {
        HttpServletResponse response = WebContext.getResponse();
        if (StringUtils.isNotBlank(getContentType())) {
            response.setContentType(getContentType());
        } else if (this.withContentType) {
            if (this.jsonpCallback == null) {
                response.setContentType(JSON_CONTENT_TYPE);
            } else {
                response.setContentType(JAVASCRIPT_CONTENT_TYPE);
            }
        }
        StringBuilder _jsonStr = new StringBuilder(jsonObj.toString());
        if (this.jsonpCallback != null) {
            _jsonStr.insert(0, this.jsonpCallback + "(").append(");");
        }
        IOUtils.write(_jsonStr.toString(), response.getOutputStream(), StringUtils
                .defaultIfEmpty(WebMVC.getConfig().getCharsetEncoding(), response.getCharacterEncoding()));
    }

}