一、maven中classnotfound

1.其实是jar包问题，maven默认会把jar包编译到target下面，而tomcat需要在WEB-INF目录下使用它，所以发现没有的问题需要在pom.xml中配置<plugin>

<artifactId>maven-compiler-plugin</artifactId>

<configuration>

1.6
    
     1.6
    
    
     UTF-8
    
      
     
      src\main\webapp\WEB-INF\lib
     
    

</configuration>

</plugin>

二、解决springmvc的get乱码问题

1.post处理乱码是这样的<filter> <filter-name>encodingFilter</filter-name> <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> <async-supported>true</async-supported> <init-param> <param-name>encoding</param-name> <param-value>UTF-8</param-value> </init-param> </filter> <filter-mapping> <filter-name>encodingFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping>

2.get乱码处理    public class EncodingFilter extends OncePerRequestFilter {  private String encoding;  public void setEncoding(String encoding) {      this.encoding = encoding;  }  @Override  protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain chain)          throws ServletException, IOException {      // 设置请求响应字符编码      request.setCharacterEncoding(encoding);      response.setCharacterEncoding(encoding);      // 传递给目标servlet或jsp的实际上是动态代理的对象，而不是原始的HttpServletRequest对象      request = (HttpServletRequest) Proxy.newProxyInstance(request.getClass().getClassLoader(), request.getClass().getInterfaces(), new MyInvacationHandler(request));      chain.doFilter(request, response);  }  class MyInvacationHandler implements InvocationHandler{      private HttpServletRequest request;      MyInvacationHandler(HttpServletRequest request){          this.request=request;      }      @Override      public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {          switch (method.getName()) {          case "getParameter":              String value = request.getParameter((String)args[0]);              try {                  if(value != null){                      value=new String(value.getBytes("ISO-8859-1"),encoding);                  }              } catch (UnsupportedEncodingException e) {                  e.printStackTrace();              }              return value;          case "getParameterValues":              String[] values = request.getParameterValues((String)args[0]);              if (values != null) {                  for (int i = 0; i < values.length; i++) {                      try {                          values[i] = new String(values[i].getBytes("ISO-8859-1"),encoding);                      } catch (UnsupportedEncodingException e) {                          e.printStackTrace();                      }                  }              }              return values;          default:              return method.invoke(request, args);          }      }  }

}

web.xml配置

<filter> <filter-name>encodingFilter12</filter-name> <filter-class>com.wjw.controller.EncodingFilter</filter-class> <init-param> <param-name>encoding</param-name> <param-value>utf-8</param-value> </init-param> </filter> <filter-mapping> <filter-name>encodingFilter12</filter-name> <url-pattern>/*</url-pattern> </filter-mapping>

或者server.xml中配置

<Connector port="8000" protocol="HTTP/1.1"connectionTimeout="20000"redirectPort="8443" URIEncoding="utf-8"/>