Java/JSP中文乱码问题-优快云博客

本文链接：https://blog.youkuaiyun.com/lixuebang4444/article/details/83875807

[color=green]JSP与页面参数之间的乱码[/color]
[color=indigo]方案一：(通过new String(username.getBytes("ISO-8859-1"), "GB18030");)[/color]
提交参数的页面：
<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%>
<html>
<body>
<form action="params_jieshou.jsp" method="post">
<input name="username" value="管理员"><br/>
<input type="submit" value="提交">
</form>
</body>
</html>

接受参数：
<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%>
<%
String username = request.getParameter("username");
username = new String(username.getBytes("ISO-8859-1"), "GB18030");
out.println(username);
%>

[color=indigo]方式二：(写一个过滤器)[/color]
要求：自己写的过滤器要实现:javax.servlet.Filter接口

package org.blueprint86.www.filter;

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;
import javax.servlet.http.HttpServletRequest;

/**
* 定义过滤器:实现中文问题的转换
* @author Li xuebang
*
*/
public class CharacterEncodingFilter implements Filter {

private String encoding = null;

public void destroy() {
this.encoding = null;
}

public void doFilter(ServletRequest request, ServletResponse response,
FilterChain filterChain) throws IOException, ServletException {
HttpServletRequest HttpReq = (HttpServletRequest)request;
HttpReq.setCharacterEncoding(encoding);
filterChain.doFilter(request, response);
}

public void init(FilterConfig filterConfig) throws ServletException {
this.encoding = filterConfig.getInitParameter("encoding");
}

}

[color=darkred]web.xml文件配置如下：[/color]
<filter>
<filter-name>CharacterEncodingFilter</filter-name>
<filter-class>org.blueprint86.www.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>GB18030</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>CharacterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>