var url = '/ShowMoblieQRCode.servlet?name=我是cm';
window.location.href = encodeURI(url);

String name = request.getParameter("name"); 
System.out.println("前台传入参数：" + name);
name = new String(name.getBytes("ISO-8859-1"),"UTF-8"); 
System.out.println("经过解码后参数：" + name);

var url = '/ShowMoblieQRCode.servlet?name=我是cm';
window.location.href = encodeURI(encodeURI(url));

String name = request.getParameter("name");
  System.out.println("前台传入参数：" + name); 
  name = URLDecoder.decode(name,"UTF-8"); 
  System.out.println("经过解码后参数：" + name);

public class CharacterEncoding implements Filter {
 private FilterConfig config ;
 String encoding = null;
  public void destroy() {
  config = null; 
 } 
 public void doFilter(ServletRequest request, ServletResponse response,
   FilterChain chain) throws IOException, ServletException {
  request.setCharacterEncoding(encoding);
  chain.doFilter(request, response); 
 }
 public void init(FilterConfig config) throws ServletException {
  this.config = config;
  //获取配置参数 
  String str = config.getInitParameter("encoding");
  if(str!=null){
   encoding = str; 
  }
 }
}

 <filter>
  <filter-name>chineseEncodingfilter-name> 
  <filter-class>
com.test.filter.CharacterEncodingfilter-class> 
    <init-param>
   <param-name>encodingparam-name> 
   <param-value>utf-8param-value> 
  init-param> 
 filter> 
  <filter-mapping> 
  <filter-name>chineseEncodingfilter-name> 
  <url-pattern>/*url-pattern>
 filter-mapping>

public class CharacterEncoding implements Filter {
 protected FilterConfig filterConfig ;
 String encoding = null; 
  public void destroy() {
  this.filterConfig = null; 
 } 
 /** 
 * 初始化
  */ 
 public void init(FilterConfig filterConfig) {
  this.filterConfig = filterConfig;
 } 
 /**
  * 将 inStr 转为 UTF-8 的编码形式
  *
  * @param inStr 输入字符串
  * @return UTF - 8 的编码形式的字符串
  * @throws UnsupportedEncodingException
  */ 
 private String toUTF(String inStr) throws UnsupportedEncodingException {
  String outStr = ""; 
  if (inStr != null) { 
   outStr = new String(inStr.getBytes("iso-8859-1"), "UTF-8"); 
  } 
  return outStr; 
 } 
 /** 
 * 中文乱码过滤处理
  */
 public void doFilter(ServletRequest servletRequest, 
   ServletResponse servletResponse, FilterChain chain) throws IOException, 
   ServletException {
  HttpServletRequest request = (HttpServletRequest) servletRequest;
  HttpServletResponse response = (HttpServletResponse) servletResponse;
  // 获得请求的方式 (1.post or 2.get), 根据不同请求方式进行不同处理
  String method = request.getMethod(); 
  // 1. 以 post 方式提交的请求 , 直接设置编码为 UTF-8 
  if (method.equalsIgnoreCase("post")) {
   try {
    request.setCharacterEncoding("UTF-8");
   }
 catch (UnsupportedEncodingException e) {
    e.printStackTrace(); 
   } 
  } 
  // 2. 以 get 方式提交的请求
  else {
   // 取出客户提交的参数集 
   Enumeration paramNames = request.getParameterNames(); 
   // 遍历参数集取出每个参数的名称及值
   while (paramNames.hasMoreElements()) {
    String name = paramNames.nextElement();// 取出参数名称 
    String values[] = request.getParameterValues(name);// 根据参数名称取出其值 
    // 如果参数值集不为空 
    if (values != null) {
     // 遍历参数值集 
     for (int i = 0; i < values.length; i++) {
      try {
     // 回圈依次将每个值调用 toUTF(values[i]) 方法转换参数值的字元编码
       String vlustr = toUTF(values[i]);
       values[i] = vlustr; 
      }
 catch (UnsupportedEncodingException e) {
       e.printStackTrace(); 
      } 
    } 
     // 将该值以属性的形式藏在 request 
     request.setAttribute(name, values);
    } 
   } 
  } 
  // 设置响应方式和支持中文的字元集
  response.setContentType("text/html;charset=UTF-8");
  // 继续执行下一个 filter, 无一下个 filter 则执行请求
  chain.doFilter(request, response); 
 }
}

 
 <filter> 
  <filter-name>chineseEncodingfilter-name> 
  <filter-class>com.test.filter.CharacterEncodingfilter-class>
 filter> 
  <filter-mapping> 
  <filter-name>chineseEncodingfilter-name>
  <url-pattern>/*url-pattern> 
 filter-mapping>