SpringMVC之乱码问题

Spring mvc 乱码问题

用 Spring mvc 提供的过滤器

<filter>
    <filter-name>encoding</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>encoding</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

实在解决不了使用

处理方法 :

修改tomcat配置文件 ： 设置编码！

处理方法 :

1. 修改tomcat配置文件 ： 设置编码！

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

2. 自定义过滤器

   package com.zdy.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 {
   
       @Override
       public void destroy() {
       }
   
       @Override
       public 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);
       }
   
       @Override
       public 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
       @Override
       public 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
       @Override
       public 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
       @Override
       public String[] getParameterValues(String name) {
           Map<String, String[]> parameterMap = getParameterMap();
           String[] values = parameterMap.get(name);
           return values;
       }
   }
   

这个也是我在网上找的一些大神写的，一般情况下，SpringMVC默认的乱码处理就已经能够很好的解决了！

<filter>
    <filter-name>encoding</filter-name>
    <filter-class>com.zdy.filter.GenericEncodingFilter</filter-class>
</filter>
<filter-mapping>
    <filter-name>encoding</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>