extjs ajax 与servlet 交互的一个例子

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extjs ajax 与servlet 交互的一个例子
==============Servlet================
package test;import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class ExtAjaxServlet extends HttpServlet {protected void service(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {    request.setCharacterEncoding("UTF-8");    response.setCharacterEncoding("UTF-8");    String entityId = request.getParameter("entityId");    System.out.println(entityId);    if(entityId.equals("00001")){    response.getWriter().write("{success:true,msg:'成功'}");    }else{    response.getWriter().write("{error:'没有录波文件'}");    response.setStatus(HttpServletResponse.SC_EXPECTATION_FAILED);     //必须设置失败标识，否则前端还会调用success函数      }}}
==============js================
Ext.onReady(function(){Ext.Ajax.request({url:'extAjax',params: {entityId: '00002'},success:function(response){        var respText = Ext.decode(response.responseText); //解码JSON格式数据为一个对象           Ext.Msg.alert('提示', respText.msg); },failure:function(response){var respText = Ext.decode(response.responseText); //解码JSON格式数据为一个对象   Ext.Msg.alert('错误', respText.error);   }})})

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