java 出现乱码如何解决

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(一)post
        [1]通过request.setCharacterEncodeing("UTF-8");
        [2]通过String name = new String(request.getParameter("name").getBytes("ios8859-1"),"utf-8")
        [3]在web.xml配置一个过滤器filter
        [4]如果是spring ,在web.xml配置一个过滤器：org.springframework.web.filter.CharacterEncodingFilter

[5Struts2]待看

(二)get
[1]在tomcat中servlet.xml中增加URIEncoding="UTF-8"
[2]用上面的通过String name = new String(request.getParameter("name").getBytes("ios8859-1"),"utf-8")

代码实现（注释部分为实现的）

<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>测试</title></head><body><form action="login" method="get"><table align="center"><tr><td>用户名： <input type="text" name="username"></input></td></tr><tr><td>密码：   <input type="password" name="password"></input></td></tr><tr><td align="center"><input type="submit" value="登陆"></input></td></tr></table></form></body></html>

web.xml

<?xml version="1.0" encoding="UTF-8"?><web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://java.sun.com/xml/ns/javaee       http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"><servlet><servlet-name>Login</servlet-name><servlet-class>com.ay.login.LoginServlet</servlet-class></servlet><servlet-mapping><servlet-name>Login</servlet-name><url-pattern>/login</url-pattern></servlet-mapping><welcome-file-list><welcome-file>login.jsp</welcome-file></welcome-file-list><!-- <filter><filter-name>encoding</filter-name><filter-class>com.ay.login.SetCharacterEncodingFilter</filter-class><init-param><param-name>encoding</param-name><param-value>utf-8</param-value></init-param></filter><filter-mapping><filter-name>encoding</filter-name><url-pattern>/*</url-pattern></filter-mapping> --><!-- 使用spring作为过滤器， --><!--<filter> --><!-- 过滤器使用spring类CharacterEncodingFilter --><!--<filter-name>encodingFilter</filter-name><filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class><init-param><param-name>encoding</param-name> --><!-- 过滤器过滤后的编码为utf-8 --><!--<param-value>utf-8</param-value></init-param></filter><filter-mapping> --><!-- 过滤所有的路径：/*代表所有的路径 --><!--<filter-name>encodingFilter</filter-name><url-pattern>/*</url-pattern></filter-mapping> --></web-app>

filter

package com.ay.login;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 {   /**    * The default character encoding to set for requests that pass through    * this filter.    */   protected String encoding = null;   /**    * The filter configuration object we are associated with.  If this value    * is null, this filter instance is not currently configured.    */   protected FilterConfig filterConfig = null;   /**    * Should a character encoding specified by the client be ignored?    */   protected boolean ignore = true;   public void destroy() {       this.encoding = null;       this.filterConfig = null;   }   public void doFilter(ServletRequest request, ServletResponse response,                        FilterChain chain) throws IOException, ServletException {       // Conditionally select and set the character encoding to be used   System.out.println("encoding1->"+encoding);       if (ignore || (request.getCharacterEncoding() == null)) {           String encoding = selectEncoding(request);           if (encoding != null)               request.setCharacterEncoding(encoding);       }       chain.doFilter(request, response);   }   /**    * Place this filter into service.    * @param filterConfig The filter configuration object    */   public void init(FilterConfig filterConfig) throws ServletException {   System.out.println("encoding2"+encoding);       this.filterConfig = filterConfig;       this.encoding = filterConfig.getInitParameter("encoding");       String value = filterConfig.getInitParameter("ignore");       if (value == null)           this.ignore = true;       else if (value.equalsIgnoreCase("true"))           this.ignore = true;       else if (value.equalsIgnoreCase("yes"))           this.ignore = true;       else           this.ignore = false;   }   protected String selectEncoding(ServletRequest request) {       return (this.encoding);   }}

src 处理输出代码

package com.ay.login;import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class LoginServlet extends HttpServlet{    private static final long serialVersionUID = 1L;    protected void doGet(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {    //一、post////    //1.设置编码格式////    request.setCharacterEncoding("UTF-8");//            System.out.println("登陆");//            String name=request.getParameter("username");//            String password=request.getParameter("password");//            //2.通过getBtyes("ios8859-1")转化成“UTF-8”////            String uname = new String(name.getBytes("iso8859-1"),"UTF-8");////            System.out.println("uname:"+uname);//            //3.增加一个过滤器Filter(自己写的)//            System.out.println("用户名："+name);//            System.out.println("密码："+password);//            //4.如果用Struts,以后会专门写一下关于Struts2如何解决乱码//            //5.若使用了spring也简单，配置一个spring中提供的拦截器：        //二、get    //1.通过getBtyes("ios8859-1")转化成“UTF-8”    String name=request.getParameter("username");    String password=request.getParameter("password");//    String uname = new String(name.getBytes("iso8859-1"),"UTF-8");//    System.out.println("uname："+uname);    System.out.println("用户名："+name);    System.out.println("密码："+password);    //2.设置tomcat服务器的server.xml这个文件，找到下面的这个段代码，添加上URIEncoding="UTF-8"，在下面这个配置中    //<connector URIEncoding="UTF-8" redirectPort="8443" protocol="HTTP/1.1" port="8080" connectionTimeout                     }    protected void doPost(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        this.doGet(request, response);    }}

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