SpringMVC解决乱码问题

朴灿烈づ我的快乐病毒、 2022-12-25 04:56 173阅读 0赞

# SpringMVC解决乱码问题 #

1.  在web.xml中配置，SpringMVC自己提供的过滤器
    
        <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>
    
     *  (不过这个不可以完全解决乱码问题)
2.  在tomcat配置文件(server.xml)中：设置编码
    
        <Connector URIEncoding="utf-8" port="8080" protocol="HTTP/1.1" connectionTimeout="20000" redirectPort="8443" />
3.  自定义过滤器（在filter包下创建）
    
        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;
          }
        }
4.  在web.xml中配置这个过滤器
    
        <filter>
                <filter-name>myencoding</filter-name>
                <filter-class>自定义的.filter.GenericEncodingFilter</filter-class>
                <init-param>
                    <param-name>encoding</param-name>
                    <param-value>utf-8</param-value>
                </init-param>
            </filter>
            <filter-mapping>
                <filter-name>myencoding</filter-name>
                <url-pattern>/*</url-pattern>
            </filter-mapping>