基于Java的JSP EasyUI封装设计源码

package org.topteam.ui.model; import com.alibaba.fastjson.JSON; import org.topteam.ui.easyui.EventListenerTag; import org.topteam.ui.easyui.EventTag; import org.topteam.ui.easyui.FacetTag; import org.topteam.ui.easyui.TagRender; import javax.servlet.ServletRequest; import javax.servlet.http.HttpServletRequest; import javax.servlet.jsp.JspTagException; import javax.servlet.jsp.JspWriter; import javax.servlet.jsp.tagext.Tag; import java.io.IOException; import java.util.*; import java.util.concurrent.atomic.AtomicInteger; /** * 一次JSP页面EasyUI控件解析的上下文。 * 从解析Body开始到Body结束，所有控件的一些属性会被暂存 * 在解析body结束的时候，写出所有控件前端渲染的方法。 * Created by 枫 on 2014/8/7. */ public class RenderContext { public static final String REQUEST_TAG_NAME = "_jeasyui_rendercontext__"; public static final String JEASYUI_TAG_NAME = "__jeasyui__"; private final Map<String, TagRender> tags = new LinkedHashMap<String, TagRender>(); private final List<EventListenerTag> eventListeners = new ArrayList<EventListenerTag>(); private final List<EventTag> events = new ArrayList<EventTag>(); private final List<FacetTag> facets = new ArrayList<FacetTag>(); private AtomicInteger atomic = new AtomicInteger(1000); private StringBuilder scriptBeforeWriter = new StringBuilder(); private String userAgent; public RenderContext(HttpServletRequest request) { this.userAgent = request.getHeader("user-agent"); } private boolean isIE(){ return userAgent.contains("MSIE"); } private boolean isIE8(){ return userAgent.contains("MSIE 8.0"); } private boolean isIE9(){ return userAgent.contains("MSIE 9.0"); } /** * 将当前jsp页面解析过程中的所有控件放入上下文中 <br /> * {@link org.topteam.ui.easyui.TagRender}实现了{@linkplain java.lang.Cloneable}接口，由于{@link javax.servlet.jsp.tagext.TagSupport} 本身没有实现Clone，所以需要注意parent Tag无法clone。 * * @param tag * @throws JspTagException */ public void putTag(TagRender tag) throws JspTagException { if (tag != null && tag.getId() != null) { if (tags.containsKey(tag.getId())) { // 由于涉及到控件的事件绑定，所以我们强制控件的ID不可以重复 throw new JspTagException("存在重复的ID：" + tag.getId()); } tags.put(tag.getId(), tag); } } /** * 通过控件id获取{@linkplain org.topteam.ui.easyui.TagRender} * * @param id * @return TagRender */ public TagRender getTag(String id) { return tags.get(id); } /** * 添加EventListenerTag到eventListeners * * @param eventListenerTag */ public void putEventListener(EventListenerTag eventListenerTag) { eventListeners.add(eventListenerTag); } /** * 添加EventTag到events * * @param eventTag */ public void putEvent(EventTag eventTag) { events.add(eventTag); } /** * 输出所有控件初始化的js代码 * * @param out * @param var * @throws IOException */ public void write(JspWriter out, String var) throws IOException { //输出Facet的Html代码 for (FacetTag facet : facets) { if (facet.getBody() != null) { out.write(facet.getBody()); out.write("\n"); } } ScriptWriter sw = new ScriptWriter(); if(isIE8() || isIE9()){ sw.ready(); } sw.write(getScriptBeforeWriter().toString()); // loop all tags for (Iterator<String> iterator = tags.keySet().iterator(); iterator.hasNext(); ) { String tagId = iterator.next(); TagRender tag = tags.get(tagId); if (tag.getEasyuiTag() != null) { // get one tag's event listeners List<EventListenerTag> listeners = getEventListeners(tag); // get one tag's event actions List<EventTag> events = getEvents(tag); // get one tag's facet List<FacetTag> facetTags = getFacets(tag); String tagScript = getTagScript(tag, listeners, events, facetTags); sw.write(tagScript); } else { List<EventListenerTag> listeners = getEventListeners(tag); // get one tag's event actions List<EventTag> events = getEvents(tag); String tagScript = getJQueryScript(tag, listeners, events); sw.write(tagScript); } String afterScript = tag.doAfterTagRenderScript(); sw.write(afterScript == null ? "" : afterScript); sw.write("\n"); } if (tags != null) { Map<String, String> tagsJs = new HashMap<String, String>(); for (Iterator<String> iterator = tags.keySet().iterator(); iterator.hasNext(); ) { String tagId = iterator.next(); if (tags.get(tagId).getEasyuiTag() != null) { tagsJs.put(tagId, tags.get(tagId).getEasyuiTag()); } } sw.write("var " + var + " = jeasyui(" + JSON.toJSONString(tagsJs) + ");"); } out.write(sw.toString()); } private List<FacetTag> getFacets(TagRender tag) { List<FacetTag> facetTags = new ArrayList<FacetTag>(); for (FacetTag facet : facets) { if (facet.getParentId() != null && facet.getParentId().equals(tag.getId())) { facetTags.add(facet); } } return facetTags; } /** * 获取tag的渲染构建js代码，同时注册相关事件监听 * * @param tag * @param listeners * @param events * @param facetTags * @return */ private String getTagScript(TagRender tag, List<EventListenerTag> listeners, List<EventTag> events, List<FacetTag> facetTags) { StringBuilder sb = new StringBuilder(); sb.append("$('#").append(tag.getId()).append("').").append(tag.getEasyuiTag()).append("("); Map<String, String> eventBindString = buildEasyEventScript(listeners, events); if (!tag.isJqueryEventBind()) { if (eventBindString.size() > 0 || facetTags.size() > 0) { sb.append("{\n"); } for (Iterator<String> iterator = eventBindString.keySet().iterator(); iterator.hasNext(); ) { String event = iterator.next(); String binds = eventBindString.get(event); sb.append(event).append(":").append("function(){").append("\n"); sb.append("var args = arguments;\n"); sb.append(binds); sb.append("}"); if (iterator.hasNext() || facetTags.size() > 0) { sb.append(","); } } for (Iterator<FacetTag> iterator = facetTags.iterator(); iterator.hasNext(); ) { FacetTag facet = iterator.next(); sb.append(facet.getName()).append(":").append("'#").append(facet.getId()).append("'"); if (iterator.hasNext()) { sb.append(","); } } if (eventBindString.size() > 0 || facetTags.size() > 0) { sb.append("\n}"); } } sb.append(");"); if (tag.isJqueryEventBind()) { for (Iterator<String> iterator = eventBindString.keySet().iterator(); iterator.hasNext(); ) { String event = iterator.next(); String binds = eventBindString.get(event); sb.append("$('#").append(tag.getId()).append("').bind("); sb.append("'").append(event).append("',