ajax与java经验小结

来源：互联网发布：谭浩强c语言入门视频编辑：程序博客网时间：2024/05/07 08:41

import javax.servlet.*;

import javax.servlet.http.*;

import java.io.*;

import java.util.*;

import com.csland.common.util.*;

//rex Servlet 框架

/**

* <p>Title: </p>

* <p>Description: Servlet 类例子，建立servlet 直接依照此类建立<br>

* 不要使用jbuilder建立Servlet的向导。不修改自身的web.xml配置</p>

* @author yl

* @version 1.0

public class Servlet1

extends HttpServlet {

private static final String CONTENT_TYPE = "text/html; charset=GBK";

//Initialize global variables

public void init() throws ServletException {

}

//Process the HTTP Get request

public void doGet(HttpServletRequest request, HttpServletResponse response) throws

ServletException, IOException {

response.setContentType(CONTENT_TYPE);

PrintWriter out = response.getWriter();

String command = StrUtil.convNull(request.getParameter("cmd"));

if (command.equals("getcolsofview")) {

String viewname = StrUtil.convNull(request.getParameter("viewname"));

out.println(QueryViewBiz.getViewColsList(viewname));

out.flush();

}

else if (command.equals("wordcontent")) { //获取惯用语内容-----2007.10.18修改开始

//String id = StrUtil.convNull(request.getParameter("id"));

out.print(phrasecontent);

}//---2007.10.18修改结束

else if (command.equals("getouttime")) {

out.println(str);

out.flush();

}

//Process the HTTP Post request

public void doPost(HttpServletRequest request, HttpServletResponse response) throws

ServletException, IOException {

doGet(request, response);

}

//Clean up resources

public void destroy() {

}

----------------调用例子

<%@ page contentType="text/html; charset=GBK" %>

<%@ page import="java.util.*" %>

<%@ page import="com.csland.common.util.*" %>

<%@ page import="com.csland.workflow.helper.*" %>

<%@ page import="com.csland.hr.po.OzMember" %>

<%@ page import="com.csland.workflow.po.*" %>

<html>

<head>

//ajax代码,by yl 2007.10.17

var http_request = false;

function send_request(url) {//初始化、指定处理函数、发送请求的函数

http_request = false;

//开始初始化XMLHttpRequest对象

if(window.XMLHttpRequest) { //Mozilla 浏览器

　 http_request = new XMLHttpRequest();

　　if (http_request.overrideMimeType) {//设置MiME类别

　　 http_request.overrideMimeType('text/xml');

　　}

else if (window.ActiveXObject) { // IE浏览器

　　try {

　　 http_request = new ActiveXObject("Msxml2.XMLHTTP");

　　} catch (e) {

　　 try {

　　 http_request = new ActiveXObject("Microsoft.XMLHTTP");

　　 } catch (e) {}

　　}

if (!http_request) { // 异常，创建对象实例失败

　 window.alert("不能创建XMLHttpRequest对象实例.");

　　return false;

}

http_request.onreadystatechange = processRequest;

// 确定发送请求的方式和URL以及是否同步执行下段代码

http_request.open("GET", url, true);//发带参数请求

http_request.send(null);

}

// 处理返回信息的函数

function processRequest() {

　　if (http_request.readyState == 4) { // 判断对象状态

　　if (http_request.status == 200) { // 信息已经成功返回，开始处理信息

　　 //;

var str=http_request.responseText;

//alert(str)

if (frm.r1.r1_1.checked){ //代替

opener.document.all['<%=ename.trim()%>'].value=str;

}

else

{

opener.document.all['<%=ename.trim()%>'].value+=str;

}

　　} else { //页面不正常

　　 alert("您所请求的页面有异常。");

　　}

int count = list.size();

function isEmpty(s)

{

return ((s == null) || (s.length == 0))

}

function selNotes(){

//var va1 = document.all.sel_notes.options[document.all.sel_notes.selectedIndex].text;

var idx=document.all.sel_notes.selectedIndex;

if (idx<0)

{

alert('请选择一条常用语!');

return ;

}

var id = document.all.sel_notes.options[idx].value;

send_request('<%=StrUtil.convUrl("/servlet")%>/Servlet1?cmd=wordcontent&id='+id);

//send_request('getwordphrasecontent.jsp?id='+id);

self.close();

}

</script>

</head>

<body>

<tr>

}

</select>

</td>

</tr>

<tr>

<input type="radio" id="r1_2" class="bottom" name="r1" checked/>追加 

<input type="radio" name="r1" id="r1_1" class="bottom" />替换

</br>

</td>

</tr>

<tr>

</tr>

</table>

</form>

</body>

</html>

经验:不是使用jsp,会多出空行