首先在web.xml加上统一编码过滤器.為的是防止乱码.
<filter> <filter-name>Set Character Encoding</filter-name> <filter-class> com.filter.SetCharacterEncodingFilter </filter-class> <init-param> <param-name>encoding</param-name> <param-value>UTF-8</param-value> </init-param> </filter> <filter-mapping> <filter-name>Set Character Encoding</filter-name> <url-pattern>/*</url-pattern> </filter-mapping>
java代码:
/** * */package com.filter;
/** * @author * */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 SetCharacterEncodingFilter implements Filter {
private String charset = "UTF-8";
public void destroy() {}
public void doFilter(ServletRequest arg0, ServletResponse arg1,FilterChain arg2) throws IOException, ServletException {arg0.setCharacterEncoding(charset);arg1.setCharacterEncoding(charset);arg2.doFilter(arg0, arg1);}
public void init(FilterConfig arg0) throws ServletException {}}
jsp页面：
<input type="text" name="student.stu_username" id="stuid" />
javascript:
$(document).ready(function(){$("#stuid").change(function(){$.post("userSearchSys.action", {username: $("#stuid").val()} ,function(data){alert(data);});});});
绑定onchange事件.
struts2.xml:
<action name="*Sys" class="com.action.Sys" method="{1}"> <result type="stream"><param name="username">inputStream</param></result> </action>
action:
public String userSearch(){ StudentDao sDao = new StudentDao(); try { int i =sDao.searchUsername(username); HttpServletResponse response = ServletActionContext.getResponse(); PrintWriter out = response.getWriter(); response.setCharacterEncoding("UTF-8"); response.setHeader("Charset","UTF-8"); response.setHeader("Cache-Control", "no-cache"); if (i==1){ out.println("用户名已经存在"); } else { out.println("用户名可用"); }} catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } return null; }
