一、问题提出
示例代码:
用户注册的jsp页面:
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>用户注册</title>
</head>
<body>
<form name="registerForm" id="registerForm" action="doUserCreate.jsp" method="get">
<table class="tb" border="0" cellspacing="5" cellpadding="0" align="center">
<tr><td align="center" colspan="2" style="text-align:center;" class="text_tabledetail2">用户注册</td></tr>
<tr>
<td class="text_tabledetail2">用户名</td>
<td><input type="text" name="username" value=""/></td>
</tr>
<tr>
<td class="text_tabledetail2">密码</td>
<td><input type="password" name="password" value=""/></td>
</tr>
<tr>
<td class="text_tabledetail2">确认密码</td>
<td><input type="password" name="con_password" value=""/></td>
</tr>
<tr>
<td class="text_tabledetail2">email</td>
<td><input type="text" name="email" value=""/></td>
</tr>
<tr>
<td class="text_tabledetail2">爱好</td>
<td>
<input type="checkbox" name="hobby" value="swim" />游泳<br/>
<input type="checkbox" name="hobby" value="read" />阅读<br/>
<input type="checkbox" name="hobby" value="climb" />爬山<br/>
<input type="checkbox" name="hobby" value="travel" />旅游<br/>
</td>
</tr>
<tr>
<td style="text-align:center;" colspan="2">
<button type="submit" class="page-btn" name="save">注册</button>
<button type="button" class="page-btn" name="return" onclick="javascript:location.href='<%=request.getContextPath() %>/index.jsp'">返回</button>
</td>
</tr>
</table>
</form>
</body>
</html>
处理用户请求的jsp页面:
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'doUserCreate.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
<%
// 获取用户注册的数据:用户名、密码、email、爱好
String username = request.getParameter("username");
String pwd = request.getParameter("password");
String email = request.getParameter("email");
String[] hobbys = request.getParameterValues("hobby");
%>
用户名:<%
if(username != null && !username.equals("")){
%>
<% out.println(username); %>
<%
} else {
out.println("1");
}
%><br/>
密码:<%=pwd %><br/>
email:<%=email %><br/>
爱好:<%
if(hobbys != null && hobbys.length != 0){
// 用户选择了爱好,获得爱好并输出
for(String hobby : hobbys) {
out.println(hobby);
}
}else{
out.println("没有选择任何爱好");
}
%><br/>
</body>
</html>
当在运行结果里面如下输入的时候:
用户处理界面的结果如下:
可以看到出现了中文乱码。
二、解决方法
表单提交到jsp,可能会出现中文乱码问题。对于不同的表单提交方式,处理方法不同。
常见的表单提交方式有get和post。
url可传播是指的下面这种方式:
2.1post
当表单提交方式为post的时候,只需要加这么一句话:
request.setCharacterEncoding("utf-8");
加完之后的处理提交数据的jsp代码如下:
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'doUserCreate.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
<%
// 表单post提交,中文乱码处理
request.setCharacterEncoding("utf-8");
response.setCharacterEncoding("utf-8");
// 获取用户注册的数据:用户名、密码、email、爱好
String username = request.getParameter("username");
String pwd = request.getParameter("password");
String email = request.getParameter("email");
String[] hobbys = request.getParameterValues("hobby");
%>
用户名:<%
if(username != null && !username.equals("")){
%>
<% out.println(username); %>
<%
} else {
out.println("1");
}
%><br/>
密码:<%=pwd %><br/>
email:<%=email %><br/>
爱好:<%
if(hobbys != null && hobbys.length != 0){
// 用户选择了爱好,获得爱好并输出
for(String hobby : hobbys) {
out.println(hobby);
}
}else{
out.println("没有选择任何爱好");
}
%><br/>
</body>
</html>
在上面的代码中,
response.setCharacterEncoding("utf-8");
这句在已经设置了jsp的默认字符编码为utf-8的情况下是可以不加的。
2.2get
第一种方式(该方式治标不治本)
示例代码:
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'doUserCreate.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
<%
// 表单post提交,中文乱码处理
request.setCharacterEncoding("utf-8");
response.setCharacterEncoding("utf-8");
// 获取用户注册的数据:用户名、密码、email、爱好
String username = request.getParameter("username");
byte[] userNames = username.getBytes("ISO-8859-1");
username = new String(userNames, "utf-8");
String pwd = request.getParameter("password");
String email = request.getParameter("email");
String[] hobbys = request.getParameterValues("hobby");
%>
用户名:<%
if(username != null && !username.equals("")){
%>
<% out.println(username); %>
<%
} else {
out.println("1");
}
%><br/>
密码:<%=pwd %><br/>
email:<%=email %><br/>
爱好:<%
if(hobbys != null && hobbys.length != 0){
// 用户选择了爱好,获得爱好并输出
for(String hobby : hobbys) {
out.println(hobby);
}
}else{
out.println("没有选择任何爱好");
}
%><br/>
</body>
</html>
这种方式的代码如下:
String username = request.getParameter("username");
byte[] userNames = username.getBytes("ISO-8859-1");
username = new String(userNames, "utf-8");
或者也可以合写为一句话:
username=new String(username.getBytes("ISO-8859-1"),"utf-8" );
其逻辑是:将获取的字符串打散,然后重新拼接到一起,在这个过程中改变字符编码格式。
但是这种方式的缺点是只能改变这一个地方的编码方式,而其他地方如果有中文的话则需要再写一遍这段代码。
第二种方式:修改tomcat的配置文件
1、找到tomcat的安装路径——conf——server.xml
打开这个server.xml文件之后,去找设置端口号那个地方,如下所示:
2、如下修改文件