struts2中以json的方式输出一张页面到前台
struts2中以json的方式输出一张页面到前台package net.esj.struts.resultsupport;import java.io.IOException;import java.io.StringWriter;import java.io.Writer;import java.util.Locale;import java.util.Properties;import javax.annotation.Resource;import javax.servlet.ServletContext;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import net.esj.basic.config.Config;import net.esj.basic.plugins.freemarker.SpringConfigToFreemarkerManager;import net.esj.basic.utils.hibe.HiJSONUtil;import org.apache.struts2.ServletActionContext;import org.apache.struts2.config.DefaultSettings;import org.apache.struts2.dispatcher.StrutsResultSupport;import org.apache.struts2.views.freemarker.FreemarkerManager;import org.apache.struts2.views.util.ResourceUtil;import org.json.JSONException;import com.opensymphony.xwork2.ActionContext;import com.opensymphony.xwork2.ActionInvocation;import com.opensymphony.xwork2.LocaleProvider;import com.opensymphony.xwork2.inject.Inject;import com.opensymphony.xwork2.util.ValueStack;import freemarker.template.Configuration;import freemarker.template.ObjectWrapper;import freemarker.template.Template;import freemarker.template.TemplateException;import freemarker.template.TemplateModel;import freemarker.template.TemplateModelException;/** * 将对应的页面文件以json的方式ajax输出到前台 * @author Administrator * */public class JsonViewResult extends FreemarkerUsageResult {/** **/private static final long serialVersionUID = 1L;public static final String JSON_VIEW_PROPERTIES = "json.view.properties";protected Configuration configuration;protected Configuration userConfiguration;protected ObjectWrapper wrapper;private String pContentType = "text/text";protected SpringConfigToFreemarkerManager springConfigToFreemarkerManager;@Overridepublic void doExecute(String location, ActionInvocation invocation) throws IOException, TemplateException{this.configuration = getConfiguration();this.wrapper = getObjectWrapper();if (!location.startsWith("/")) { ActionContext ctx = invocation.getInvocationContext(); HttpServletRequest req = (HttpServletRequest) ctx .get(ServletActionContext.HTTP_REQUEST); String base = ResourceUtil.getResourceBase(req); location = base + "/" + location; } Template template = null;try{if(canUserConfiguration(invocation)){this.userConfiguration = getUserConfiguration();template = userConfiguration.getTemplate(location,deduceLocale(invocation));}}catch(Exception e){//NOUSE}finally{if(template==null){template = configuration.getTemplate(location,deduceLocale(invocation));}}TemplateModel model = createModel(invocation);Writer out = new StringWriter();if (preTemplateProcess(template, model)) {try {template.process(model, out);String result = HiJSONUtil.toJSONString(out.toString());//转成JSONServletActionContext.getResponse().getWriter().print(result);} catch (JSONException e) {e.printStackTrace();} finally {postTemplateProcess(template, model);}}}protected void postTemplateProcess(Template template, TemplateModel data)throws IOException {}protected boolean preTemplateProcess(Template template, TemplateModel model)throws IOException {Object attrContentType = template.getCustomAttribute("content_type");if (attrContentType != null) {ServletActionContext.getResponse().setContentType(attrContentType.toString());} else {String contentType = getContentType();if (contentType == null) {contentType = "text/html";}String encoding = template.getEncoding();if (encoding != null) {contentType = contentType + "; charset=" + encoding;}ServletActionContext.getResponse().setContentType(contentType);}return true;}protected TemplateModel createModel(ActionInvocation invocation)throws TemplateModelException {ServletContext servletContext = ServletActionContext.getServletContext();HttpServletRequest request = ServletActionContext.getRequest();HttpServletResponse response = ServletActionContext.getResponse();ValueStack stack = ServletActionContext.getContext().getValueStack();Object action = null;if (invocation != null)action = invocation.getAction(); // Added for NullPointExceptionreturn springConfigToFreemarkerManager.buildTemplateModel(stack, action,servletContext, request, response, wrapper);}protected Configuration getConfiguration() throws TemplateException {return springConfigToFreemarkerManager.getConfiguration(ServletActionContext.getServletContext());}protected Configuration getUserConfiguration() {return springConfigToFreemarkerManager.getUserConfiguration(ServletActionContext.getServletContext());}protected Locale deduceLocale(ActionInvocation invocation) {if (invocation.getAction() instanceof LocaleProvider) {return ((LocaleProvider) invocation.getAction()).getLocale();} else {return configuration.getLocale();}}protected ObjectWrapper getObjectWrapper() {return configuration.getObjectWrapper();}public String getContentType() {return pContentType;}public void setContentType(String aContentType) {pContentType = aContentType;}protected Writer getWriter() throws IOException {return ServletActionContext.getResponse().getWriter();}@Resource public void setSpringConfigToFreemarkerManager(SpringConfigToFreemarkerManager mgr) { this.springConfigToFreemarkerManager = mgr; } }
增加struts.xml配置
<package name="melon-default" extends="struts-default" >
<result-types>
<result-type name="jsonview" class="net.esj.struts.resultsupport.JsonViewResult"/>
</result-types>
</package>
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