struts超簡單入門（三）

寫三個Java類，編譯後放到Tomcat 5.0\webaPPS truts\WEB-INF\classes\com\javer\test truts\目錄下

【HelloFrom.Java】：

package com.javer.test.struts;

import Javax.servlet.http.HttpServletRequest;import org.apache.struts.action.ActionError;import org.apache.struts.action.ActionErrors;import org.apache.struts.action.ActionForm;import org.apache.struts.action.ActionMapping;

public final class HelloFrom extends ActionForm{ private String person = null; public String getPerson() { return person; }

public void setPerson(String person) { this.person = person; }

public void reset(ActionMapping mapping, HttpServletRequest request) { this.person = null; }

public ActionErrors validate(ActionMapping mapping,HttpServletRequest request) { ActionErrors errors = new ActionErrors();

if(this.person==null || this.person.length()<1) errors.add("person",new ActionError("com.javer.test.struts.hello.error")); return errors; }}

【HelloModel.Java】：

package com.javer.test.struts;

public class HelloModel{ public void saveToPersistentStore(HelloFrom hf) { System.out.println("Hello "+hf.getPerson()+"！這裡可存儲數據到數據庫中！"); }}

【HelloAction.Java】：

package com.javer.test.struts;

import javax.servlet.http.HttpServletRequest;import Javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.Action;import org.apache.struts.action.ActionError;import org.apache.struts.action.ActionErrors;import org.apache.struts.action.ActionForm;import org.apache.struts.action.ActionForward;import org.apache.struts.action.ActionMapping;

import org.apache.struts.util.MessageResources;

import org.apache.commons.beanutils.PropertyUtils;

public final class HelloAction extends Action{ public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception { MessageResources messages = getResources(request);

ActionErrors errors = new ActionErrors(); String person = (String) PropertyUtils.getSimpleProperty(form, "person");

if(person.indexOf(",")!=-1) { errors.add("person",new ActionError("com.javer.test.struts.hello.unallowed.person",form)); saveErrors(request,errors); request.removeAttribute(mapping.getAttribute()); return new ActionForward(mapping.getInput()); }

HelloModel hm = new HelloModel(); hm.saveToPersistentStore((HelloFrom)form);

request.removeAttribute(mapping.getAttribute()); request.setAttribute("helloForm",form);

return mapping.findForward("SayHello"); }}

這個類不是struts必需的，是我為了轉化編碼而增加的

【EncodingFilter.Java】：

package com.javer.test.struts;

import java.io.IOException;import javax.servlet.Filter;import javax.servlet.FilterChain;import javax.servlet.FilterConfig;import javax.servlet.ServletException;import javax.servlet.ServletRequest;import Javax.servlet.ServletResponse;

public class EncodingFilter implements Filter{ protected String encoding = null;

protected FilterConfig filterConfig = null;

protected boolean ignore = true;

public void destroy() { this.encoding = null; this.filterConfig = null; }

public void doFilter( ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { if (ignore || (request.getCharacterEncoding() == null)) { request.setCharacterEncoding(selectEncoding(request)); } chain.doFilter(request, response); }

public void init(FilterConfig filterConfig) throws ServletException {

this.filterConfig = filterConfig; this.encoding = filterConfig.getInitParameter("encoding"); String value = filterConfig.getInitParameter("ignore"); if (value == null) { this.ignore = true; } else if (value.equalsIgnoreCase("true") || value.equalsIgnoreCase("yes")) { this.ignore = true; } else { this.ignore = false; } }

protected String selectEncoding(ServletRequest request) { return (this.encoding); }

public FilterConfig getFilterConfig() { return filterConfig; }

public void setFilterConfig(FilterConfig filterConfig) { this.filterConfig = filterConfig; }}