使用过滤器解决中文乱码问题

来源：互联网发布：mysql自动弹出编辑：程序博客网时间：2024/05/16 16:14

1. 创建字符编码过滤器对象，源码如下：

package com.tzy.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;public class CharacterFilter implements Filter {String encoding = null;@Overridepublic void destroy() {encoding = null;}@Overridepublic void doFilter(ServletRequest request, ServletResponse response,FilterChain chain) throws IOException, ServletException {if (encoding != null) {request.setCharacterEncoding(encoding);response.setContentType("text/html;charset=" + encoding);}/* * 在过滤器对象的doFilter()方法中，业务逻辑处理完成之后， * 需要通过FilterChain对象的doFilter()方法将请求传递到下一过滤器或目标资源，否则将出现错误。 */chain.doFilter(request, response);}@Overridepublic void init(FilterConfig filterConfig) throws ServletException {encoding = filterConfig.getInitParameter("encoding");}}

2. 在Web.xml文件中对过滤器进行配置，配置如下：

<filter>  <filter-name>CharacterFilter</filter-name>  <filter-class>com.tzy.filter.CharacterFilter</filter-class  <init-param>    <param-name>encoding</param-name>    <param-value>UTF-8</param-value>  </init-param></filter><filter-mapping>  <filter-name>CharacterFilter</filter-name>  <url-pattern>/*</url-pattern></filter-mapping>

在Web.xml文件中，配置过滤器，其过滤器的URL映射可以使用正则表达式进行配置，如实例中使用“/*”来匹配所有请求。

3. 我们下面写实例进行测试：

3.1 编写html文件，代码如下：

<!DOCTYPE HTML><html>  <head>  <meta charset="utf-8"/>    <title>注册</title>  </head>    <body>  <div align="center">  <form action="servlet/RegisterServlet" method="post">    <table>        <thead>            <tr>                <td width="300">个人信息</td>                </tr>            </thead>            <tbody>            <tr>                <td width="100">姓名：</td>                    <td width="200"><input type="text" name="name"/></td>                </tr>                <tr>                <td width="100">性别：</td>                    <td width="200">                    <input type="radio" name="gender" value="男"/>男                        <input type="radio" name="gender" value="女"/>女                    </td>                </tr>                <tr>                <td width="100">联系方式：</td>                    <td  width="200"><input type="text" name="email"/></td>                </tr>                <tr>                <td width="100">家庭住址：</td>                    <td width="200"><input type="text" name="address"/></td>                </tr>                <tr>                <td width="300">                <input type="submit" value="提交"/>                </td>                </tr>            </tbody>        </table>    </form>  </div>  </body></html>

3.2 处理请求的Servlet代码如下：

package com.tzy.filter;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class RegisterServlet extends HttpServlet {private static final long serialVersionUID = 1L;public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doPost(request, response);}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {response.setContentType("text/html");PrintWriter out = response.getWriter();String name = request.getParameter("name");String gender = request.getParameter("gender");String email = request.getParameter("email");String address = request.getParameter("address");out.print("<html>");out.print("<h2>个人信息</h2><hr/>");out.print("姓名：" + name + "<br/>");out.print("性别：" + gender + "<br/>");out.print("联系方式：" + email + "<br/>");out.print("家庭住址：" + address + "<br/>");out.print("</html>");}}

3.3 不要忘了在Web.xml中对Servlet进行配置：

<servlet>    <description>处理注册信息</description>    <servlet-name>RegisterServlet</servlet-name>    <servlet-class>com.tzy.filter.RegisterServlet</servlet-class>  </servlet>  <servlet-mapping>    <servlet-name>RegisterServlet</servlet-name>    <url-pattern>/servlet/RegisterServlet</url-pattern>  </servlet-mapping>

OK，大功告成！

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