请求乱码
GET请求乱码：
原因：请求参数带在url地址上、url地址什么时候解析？
tomcat收到请求对url进行编解码（ISO8859-1）
解决方案：在tomcat的8080端口配置出加上 URIEncoding="utf-8"；
<Connector URIEncoding="utf-8" connectionTimeout="20000" port="8080" protocol="HTTP/1.1" redirectPort="8443"/>
POST请求乱码：
原因：请求参数是带在请求体
请求体的解码是在第一次获取参数的时候
filter可以用来解决乱码
request.setCharacterEncoding("utf-8")
响应乱码
response.setContentType("text/html;charset=utf-8")
1、tomcat一安装；上手就给server.xml中的8080处加上URIEncoding="utf-8"
2、给项目里面再搞一个filter让他来解决所有的post乱码；
3、SpringMVC自带的一个乱码解决的filter
项目的web.xml中配置：
<!--字符编码的filter一定要放在最前面 --> <filter> <filter-name>CharacterEncodingFilter</filter-name> <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> <!-- 配置encoding，告诉我们指定的编码格式 --> <init-param> <param-name>encoding</param-name> <param-value>utf-8</param-value> </init-param> <!-- 解决响应乱码 --> <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> <!-- 支持rest的filter --> <filter> <filter-name>HiddenHttpMethodFilter</filter-name> <filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class> </filter> <filter-mapping> <filter-name>HiddenHttpMethodFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping>
在配置里面配置了encoding和forceEncoding
来看看CharacterEncodingFilter的源码,通过request.setCharacterEncoding(this.encoding)和response.setCharacterEncoding(this.encoding)来解决post请求和响应乱码的问题：
public class CharacterEncodingFilter extends OncePerRequestFilter { private String encoding; private boolean forceEncoding = false; public void setEncoding(String encoding) { this.encoding = encoding; } public void setForceEncoding(boolean forceEncoding) { this.forceEncoding = forceEncoding; } @Override protected void doFilterInternal( HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException { //encoding是UTF-8 //forceEncoding位true if (this.encoding != null && (this.forceEncoding || request.getCharacterEncoding() == null)) { request.setCharacterEncoding(this.encoding); if (this.forceEncoding) { response.setCharacterEncoding(this.encoding); } } filterChain.doFilter(request, response); } }
