Ajax(4):post请求之表单中含有中文时如何处理

来源：互联网发布：从u盘安装linux 编辑：程序博客网时间：2024/05/16 09:51

当采用post方式向服务器发送请求时，并且表单中被输入了中文时，往往会出现乱码的状况。

解决的方法: 在接收请求的Servlet中加上如下代码：

request.setCharacterEncoding("UTF-8");

对于利用Ajax发送post请求，浏览器统一使用UTF-8进行编码。此行代码的作用就是以编程的方式指定让Tomcat服务器以UTF-8进行解码，这样编码和解码就保持了一致。

测试代码如下：

register.jsp :

<%@ page contentType="text/html;charset=UTF-8" pageEncoding="UTF-8"%><html><head><title>Insert title here</title><script type="text/javascript" src="js/prototype1.6.js"></script><script type="text/javascript">function getXmlHttpRequest(){var xhr=null;if((typeof XMLHttpRequest)!='undefined'){xhr=new XMLHttpRequest();}else{xhr=new ActiveXObject("Microsoft.XMLHttp");}return xhr;}function valiUsername(){var xhr=getXmlHttpRequest();xhr.onreadystatechange=function(){if(xhr.readyState==4){if(xhr.status==200){var doc=xhr.responseText;document.getElementById('username_msg').innerHTML=doc;}else{document.getElementById('username_msg').innerHTML="系统错误...";}}else{document.getElementById('username_msg').innerHTML="验证中...";}}var url="valiusername.do";xhr.open("post",url,true);xhr.setRequestHeader("Content-Type","application/x-www-form-urlencoded");xhr.send("username="+document.getElementById('n1').value);}</script></head><body><form action="register.do" method="post">姓名:<input type="text" name="username" id="n1" onblur="valiUsername();"><span style="color:red" id="username_msg"></span><br>密码:<input type="password" name="password"><br><input type="submit" value="注册"></form></body></html>

UsernameServlet.java :

public class UsernameServlet extends HttpServlet {public void service(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {request.setCharacterEncoding("UTF-8");String uri=request.getRequestURI();String path=uri.substring(uri.lastIndexOf("/"),uri.lastIndexOf("."));response.setContentType("text/html;charset=UTF-8");PrintWriter pw=response.getWriter();if(path.equals("/valiusername")){String username=request.getParameter("username");System.out.println("姓名:"+username);if(username.equals("格林")){pw.println("用户名已经占用");}else{pw.println("用户名可以使用");}}if(path.equals("/register")){String username=request.getParameter("username");String password=request.getParameter("password");response.sendRedirect("login.jsp");}}}