java解决request和response中文乱码问题

一，乱码原因

原因：前端（服务端）编码和后端解码格式不匹配。（服务端默认编码格式是iso8859-1）

将页面的编码格式申明为UTF-8

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

在jsp页面还要使用

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="Utf-8"%>

pageEncodeing：指的是jsp的内容编码（使用UTF-8）

contentType ：服务端到后端的编码格式需要与后端解码格式相同

二、解决乱码

解决：将前端编码格式与后端转码格式设置为一样

1.response乱码

字符流编码设置

response.setCharacterEncoding("UTF-8");

response.setHeader("content-type", "text/html; charset=utf-8");

response.setContentType("text/html;charset=utf-8");

response.getWriter().println("<meta http-equiv='Content-Type' content='text/html; charset=utf-8'>");

字节流编码设置

response.getOutputStream().write("字符".getBytes("UTF-8"));

response.setHeader("content-type", "text/html;charset=UTF-8");

response.setContentType("text/html;charset=UTF-8");

2.request编码

1.get请求

    1.使用new String（"字符".getbytes("ISO8859-1"),"UTF-8"）来进行手动转码

    2.设置tomcat的server.xml的配置文件

   <Connector connectionTimeout="20000" port="8080" protocol="HTTP/1.1" redirectPort="8443"
    URIEncoding="UTF-8" useBodyEncodingForURI="true"/>

2.post请求

request.setCharacterEncoding(“UTF-8”);(意思是将请求的数据进行utf-8转码)

3.编码过滤

1.在web.xml下面设置spring的编码过滤能解决大部分编码问题

<filter>
      <filter-name>characterEncodingFilter</filter-name>
      <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
      <init-param>
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
        <init-param>
            <param-name>forceEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
</filter>
<filter-mapping>
      <filter-name>characterEncodingFilter</filter-name>
      <url-pattern>/*</url-pattern>
</filter-mapping>

2.但是有时使用post提交时（request流接收时任然不能正确转码）所以在读取流时可以下边进行转码

/**
   * 将一个输入流转化为字符串(转化编码格式)
   */
   public static String getStreamString(InputStream tInputStream) {
       if (tInputStream != null) {
           BufferedReader tBufferedReader = null;
           try {
               tBufferedReader = new BufferedReader(new InputStreamReader(tInputStream,"UTF-8"));
               StringBuffer tStringBuffer = new StringBuffer();
               String sTempOneLine = new String("");
               while ((sTempOneLine = tBufferedReader.readLine()) != null) {
                   tStringBuffer.append(sTempOneLine);
               }
               return tStringBuffer.toString();
           } catch (Exception ex) {
               ex.printStackTrace();
           }finally{
               try {
                   if(null != tBufferedReader){
                       tBufferedReader.close();
                   }
               } catch (IOException e) {
                   e.printStackTrace();
               }
           }
       }
       return null;
   }