解决中文乱码

字符集及其编码

(1) ASCII

7bit，包括英文和控制字符

(2) ISO8859-1

8bit, 添加欧洲语言字符，兼容ASCII

(3) GB2312

16bit, 添加常用汉字、日文、数字等, 兼容ASCII

(4) GBK

16bit, 添加不常用汉字、图形等，兼容GB2312

(5) GB18030

添加少数民资汉字，兼容GBK

(5) Unicode

统一全球编码集

UTF-8，可变长编码，每8个bit作为一组，每个字符可能是1/2/3个byte组成，第一个byte的前端代表了这个字符有几个字节；

UTF-16, 可变长编码，每16个bit作为一组

JSP页面乱码

添加

  <%@page pageEncoding="UTF-8" contentType="text/html;charset=utf-8" %>

Servlet页面显示乱码

添加

  servletResponse.setCharacterEncoding("UTF-8");
  servletResponse.setContentType("text/html;charset=utf-8");

更好的方式是添加filter

web.xml(放在最前面)

  <filter>
      <filter-name>EncodingFilter</filter-name>
      <filter-class>filter.EncodingFilter</filter-class>
      <init-param>
          <param-name>characterEncoding</param-name>
          <param-value>UTF-8</param-value>
      </init-param>
      <init-param>
          <param-name>contentType</param-name>
          <param-value>text/html;charset=utf-8</param-value>
      </init-param>
  </filter>
  <filter-mapping>
      <filter-name>EncodingFilter</filter-name>
      <url-pattern>/*</url-pattern>
  </filter-mapping>

EncodingFilter.java

  public class EncodingFilter implements Filter {

      private String characterEncoding;
      private String contentType;

      public void init(FilterConfig filterConfig) throws ServletException {

          this.characterEncoding = filterConfig.getInitParameter("characterEncoding");
          this.contentType = filterConfig.getInitParameter("contentType");
      }

      public void destroy() {
      }

      public void doFilter(ServletRequest servletRequest,
                           ServletResponse servletResponse,
                           FilterChain filterChain) throws IOException, ServletException {

          servletRequest.setCharacterEncoding(this.characterEncoding);

          servletResponse.setCharacterEncoding(this.characterEncoding);
          servletResponse.setContentType(this.contentType);

          filterChain.doFilter(servletRequest, servletResponse);
      }
  }

post表单传递参数乱码(Servlet/JSP)

Servlet:

  request.setCharacterEncoding("UTF-8");

JSP:

  <%request.setCharacterEncoding("UTF-8");%>

URL传递参数乱码

例如： http://localhost:8080/project?name=张三

解决办法

修改 conf/server.xml 的