67.在使用SpringMVC时说说你是如何解决 get 和 post 乱码问题？

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说说你是如何解决 get 和 post 乱码问题？

（1）解决post请求乱码问题：在web.xml中配置一个CharacterEncodingFilter过滤器，设置成utf8；

 <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></filter><filter‐mapping><filter‐name>CharacterEncodingFilter</filter‐name><url‐pattern>/*</url‐pattern></filter‐mapping>

（2）get请求中文参数出现乱码解决方法有两个：
①修改tomcat配置文件添加编码与工程编码一致，如下：

 <ConnectorURIEncoding="utf‐8" connectionTimeout="20000" port="8080" protocol="HTTP/1.1" redirectPort="8443"/>

②另外一种方法对参数进行重新编码：

 String userName = new String(request.getParamter("userName").getBytes("ISO8859‐1"),"utf‐8")

ISO88591是tomcat默认编码，需要将tomcat编码后的内容按utf8编码。

（3）自定义过滤器
实现Filter 接口

public class DiyCharacterFilter implements Filter {@Overridepublic void init(FilterConfig filterConfig) throws ServletException {}@Overridepublic void doFilter(ServletRequest servletRequest,ServletResponse servletResponse,FilterChain filterChain) throws IOException, ServletException {//这里加入对编码的处理servletRequest.setCharacterEncoding("utf-8");filterChain.doFilter(servletRequest, servletResponse);}@Overridepublic void destroy() {}
}

配置web.xml

<filter><filter-name>diyCharacterFilter</filter-name><filter-class>com.web.filter.DiyCharacterFilter</filter-class>
</filter>
<filter-mapping><filter-name>diyCharacterFilter</filter-name><url-pattern>/*</url-pattern>
</filter-mapping>

（4）最后一招

自定义一个特殊的编码过滤器，记得要在web.xml文件中配置一下哈，这里就不写了，和上面一样

package com.kuang.filter;import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.Map;/**
* 解决get和post请求 全部乱码的过滤器
*/
public class GenericEncodingFilter implements Filter {@Overridepublic void destroy() {}@Overridepublic void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {//处理response的字符编码HttpServletResponse myResponse=(HttpServletResponse) response;myResponse.setContentType("text/html;charset=UTF-8");// 转型为与协议相关对象HttpServletRequest httpServletRequest = (HttpServletRequest) request;// 对request包装增强HttpServletRequest myrequest = new MyRequest(httpServletRequest);chain.doFilter(myrequest, response);}@Overridepublic void init(FilterConfig filterConfig) throws ServletException {}}//自定义request对象，HttpServletRequest的包装类
class MyRequest extends HttpServletRequestWrapper {private HttpServletRequest request;//是否编码的标记private boolean hasEncode;//定义一个可以传入HttpServletRequest对象的构造函数，以便对其进行装饰public MyRequest(HttpServletRequest request) {super(request);// super必须写this.request = request;}// 对需要增强方法 进行覆盖@Overridepublic Map getParameterMap() {// 先获得请求方式String method = request.getMethod();if (method.equalsIgnoreCase("post")) {// post请求try {// 处理post乱码request.setCharacterEncoding("utf-8");return request.getParameterMap();} catch (UnsupportedEncodingException e) {e.printStackTrace();}} else if (method.equalsIgnoreCase("get")) {// get请求Map<String, String[]> parameterMap = request.getParameterMap();if (!hasEncode) { // 确保get手动编码逻辑只运行一次for (String parameterName : parameterMap.keySet()) {String[] values = parameterMap.get(parameterName);if (values != null) {for (int i = 0; i < values.length; i++) {try {// 处理get乱码values[i] = new String(values[i].getBytes("ISO-8859-1"), "utf-8");} catch (UnsupportedEncodingException e) {e.printStackTrace();}}}}hasEncode = true;}return parameterMap;}return super.getParameterMap();}//取一个值@Overridepublic String getParameter(String name) {Map<String, String[]> parameterMap = getParameterMap();String[] values = parameterMap.get(name);if (values == null) {return null;}return values[0]; // 取回参数的第一个值}//取所有值@Overridepublic String[] getParameterValues(String name) {Map<String, String[]> parameterMap = getParameterMap();String[] values = parameterMap.get(name);return values;}
}